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-rw-r--r--toys/pending/dhcp.c1536
-rw-r--r--toys/pending/dhcpd.c1247
2 files changed, 2783 insertions, 0 deletions
diff --git a/toys/pending/dhcp.c b/toys/pending/dhcp.c
new file mode 100644
index 00000000..d7a43fad
--- /dev/null
+++ b/toys/pending/dhcp.c
@@ -0,0 +1,1536 @@
+/* dhcp.c - DHCP client for dynamic network configuration.
+ *
+ * Copyright 2012 Madhur Verma <mad.flexi@gmail.com>
+ * Copyright 2013 Kyungwan Han <asura321@gmail.com>
+ *
+ * Not in SUSv4.
+USE_DHCP(NEWTOY(dhcp, "V:H:F:x*r:O*A#<0T#<0t#<0s:p:i:SBRCaovqnbf", TOYFLAG_SBIN|TOYFLAG_ROOTONLY))
+
+config DHCP
+ bool "dhcp"
+ default n
+ help
+ usage: dhcp [-fbnqvoCRB] [-i IFACE] [-r IP] [-s PROG] [-p PIDFILE]
+ [-H HOSTNAME] [-V VENDOR] [-x OPT:VAL] [-O OPT]
+
+ Configure network dynamicaly using DHCP.
+
+ -i Interface to use (default eth0)
+ -p Create pidfile
+ -s Run PROG at DHCP events (default /usr/share/dhcp/default.script)
+ -B Request broadcast replies
+ -t Send up to N discover packets
+ -T Pause between packets (default 3 seconds)
+ -A Wait N seconds after failure (default 20)
+ -f Run in foreground
+ -b Background if lease is not obtained
+ -n Exit if lease is not obtained
+ -q Exit after obtaining lease
+ -R Release IP on exit
+ -S Log to syslog too
+ -a Use arping to validate offered address
+ -O Request option OPT from server (cumulative)
+ -o Don't request any options (unless -O is given)
+ -r Request this IP address
+ -x OPT:VAL Include option OPT in sent packets (cumulative)
+ -F Ask server to update DNS mapping for NAME
+ -H Send NAME as client hostname (default none)
+ -V VENDOR Vendor identifier (default 'toybox VERSION')
+ -C Don't send MAC as client identifier
+ -v Verbose
+
+ Signals:
+ USR1 Renew current lease
+ USR2 Release current lease
+
+*/
+
+#define FOR_dhcp
+#include "toys.h"
+#include "toynet.h"
+
+// TODO: headers not in posix:
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+#include <netpacket/packet.h>
+
+#include <linux/filter.h> //FIXME: linux specific. fix for other OS ports
+#include <linux/if_ether.h>
+
+GLOBALS(
+ char *iface;
+ char *pidfile;
+ char *script;
+ long retries;
+ long timeout;
+ long tryagain;
+ struct arg_list *req_opt;
+ char *req_ip;
+ struct arg_list *pkt_opt;
+ char *fdn_name;
+ char *hostname;
+ char *vendor_cls;
+)
+
+#define flag_get(f,v,d) ((toys.optflags & f) ? v : d)
+#define flag_chk(f) ((toys.optflags & f) ? 1 : 0)
+
+#define STATE_INIT 0
+#define STATE_REQUESTING 1
+#define STATE_BOUND 2
+#define STATE_RENEWING 3
+#define STATE_REBINDING 4
+#define STATE_RENEW_REQUESTED 5
+#define STATE_RELEASED 6
+
+#define BOOTP_BROADCAST 0x8000
+#define DHCP_MAGIC 0x63825363
+
+#define DHCP_REQUEST 1
+#define DHCP_REPLY 2
+#define DHCP_HTYPE_ETHERNET 1
+
+#define DHCPC_SERVER_PORT 67
+#define DHCPC_CLIENT_PORT 68
+
+#define DHCPDISCOVER 1
+#define DHCPOFFER 2
+#define DHCPREQUEST 3
+#define DHCPACK 5
+#define DHCPNAK 6
+#define DHCPRELEASE 7
+
+#define DHCP_OPTION_PADDING 0x00
+#define DHCP_OPTION_SUBNET_MASK 0x01
+#define DHCP_OPTION_ROUTER 0x03
+#define DHCP_OPTION_DNS_SERVER 0x06
+#define DHCP_OPTION_HOST_NAME 0x0c
+#define DHCP_OPTION_BROADCAST 0x1c
+#define DHCP_OPTION_REQ_IPADDR 0x32
+#define DHCP_OPTION_LEASE_TIME 0x33
+#define DHCP_OPTION_OVERLOAD 0x34
+#define DHCP_OPTION_MSG_TYPE 0x35
+#define DHCP_OPTION_SERVER_ID 0x36
+#define DHCP_OPTION_REQ_LIST 0x37
+#define DHCP_OPTION_MAX_SIZE 0x39
+#define DHCP_OPTION_CLIENTID 0x3D
+#define DHCP_OPTION_VENDOR 0x3C
+#define DHCP_OPTION_FQDN 0x51
+#define DHCP_OPTION_END 0xFF
+
+#define DHCP_NUM8 (1<<8)
+#define DHCP_NUM16 (1<<9)
+#define DHCP_NUM32 DHCP_NUM16 | DHCP_NUM8
+#define DHCP_STRING (1<<10)
+#define DHCP_STRLST (1<<11)
+#define DHCP_IP (1<<12)
+#define DHCP_IPLIST (1<<13)
+#define DHCP_IPPLST (1<<14)
+#define DHCP_STCRTS (1<<15)
+
+#define LOG_SILENT 0x0
+#define LOG_CONSOLE 0x1
+#define LOG_SYSTEM 0x2
+
+#define MODE_OFF 0
+#define MODE_RAW 1
+#define MODE_APP 2
+
+static void (*dbg)(char *format, ...);
+static void dummy(char *format, ...){
+ return;
+}
+
+typedef struct dhcpc_result_s {
+ struct in_addr serverid;
+ struct in_addr ipaddr;
+ struct in_addr netmask;
+ struct in_addr dnsaddr;
+ struct in_addr default_router;
+ uint32_t lease_time;
+} dhcpc_result_t;
+
+typedef struct __attribute__((packed)) dhcp_msg_s {
+ uint8_t op;
+ uint8_t htype;
+ uint8_t hlen;
+ uint8_t hops;
+ uint32_t xid;
+ uint16_t secs;
+ uint16_t flags;
+ uint32_t ciaddr;
+ uint32_t yiaddr;
+ uint32_t nsiaddr;
+ uint32_t ngiaddr;
+ uint8_t chaddr[16];
+ uint8_t sname[64];
+ uint8_t file[128];
+ uint32_t cookie;
+ uint8_t options[308];
+} dhcp_msg_t;
+
+typedef struct __attribute__((packed)) dhcp_raw_s {
+ struct iphdr iph;
+ struct udphdr udph;
+ dhcp_msg_t dhcp;
+} dhcp_raw_t;
+
+typedef struct dhcpc_state_s {
+ uint8_t macaddr[6];
+ char *iface;
+ int ifindex;
+ int sockfd;
+ int status;
+ int mode;
+ uint32_t mask;
+ struct in_addr ipaddr;
+ struct in_addr serverid;
+ dhcp_msg_t pdhcp;
+} dhcpc_state_t;
+
+typedef struct option_val_s {
+ char *key;
+ uint16_t code;
+ void *val;
+ size_t len;
+} option_val_t;
+
+struct fd_pair { int rd; int wr; };
+static uint32_t xid;
+static dhcpc_state_t *state;
+static struct fd_pair sigfd;
+uint8_t bmacaddr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+ int set = 1;
+uint8_t infomode = LOG_CONSOLE;
+uint8_t raw_opt[29];
+int raw_optcount = 0;
+struct arg_list *x_opt;
+in_addr_t server = 0;
+
+static option_val_t *msgopt_list = NULL;
+static option_val_t options_list[] = {
+ {"lease" , DHCP_NUM32 | 0x33, NULL, 0},
+ {"subnet" , DHCP_IP | 0x01, NULL, 0},
+ {"broadcast" , DHCP_IP | 0x1c, NULL, 0},
+ {"router" , DHCP_IP | 0x03, NULL, 0},
+ {"ipttl" , DHCP_NUM8 | 0x17, NULL, 0},
+ {"mtu" , DHCP_NUM16 | 0x1a, NULL, 0},
+ {"hostname" , DHCP_STRING | 0x0c, NULL, 0},
+ {"domain" , DHCP_STRING | 0x0f, NULL, 0},
+ {"search" , DHCP_STRLST | 0x77, NULL, 0},
+ {"nisdomain" , DHCP_STRING | 0x28, NULL, 0},
+ {"timezone" , DHCP_NUM32 | 0x02, NULL, 0},
+ {"tftp" , DHCP_STRING | 0x42, NULL, 0},
+ {"bootfile" , DHCP_STRING | 0x43, NULL, 0},
+ {"bootsize" , DHCP_NUM16 | 0x0d, NULL, 0},
+ {"rootpath" , DHCP_STRING | 0x11, NULL, 0},
+ {"wpad" , DHCP_STRING | 0xfc, NULL, 0},
+ {"serverid" , DHCP_IP | 0x36, NULL, 0},
+ {"message" , DHCP_STRING | 0x38, NULL, 0},
+ {"vlanid" , DHCP_NUM32 | 0x84, NULL, 0},
+ {"vlanpriority" , DHCP_NUM32 | 0x85, NULL, 0},
+ {"dns" , DHCP_IPLIST | 0x06, NULL, 0},
+ {"wins" , DHCP_IPLIST | 0x2c, NULL, 0},
+ {"nissrv" , DHCP_IPLIST | 0x29, NULL, 0},
+ {"ntpsrv" , DHCP_IPLIST | 0x2a, NULL, 0},
+ {"lprsrv" , DHCP_IPLIST | 0x09, NULL, 0},
+ {"swapsrv" , DHCP_IP | 0x10, NULL, 0},
+ {"routes" , DHCP_STCRTS | 0x21, NULL, 0},
+ {"staticroutes" , DHCP_STCRTS | 0x79, NULL, 0},
+ {"msstaticroutes" , DHCP_STCRTS | 0xf9, NULL, 0},
+};
+
+static struct sock_filter filter_instr[] = {
+ BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 9),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, IPPROTO_UDP, 0, 6),
+ BPF_STMT(BPF_LD|BPF_H|BPF_ABS, 6),
+ BPF_JUMP(BPF_JMP|BPF_JSET|BPF_K, 0x1fff, 4, 0),
+ BPF_STMT(BPF_LDX|BPF_B|BPF_MSH, 0), BPF_STMT(BPF_LD|BPF_H|BPF_IND, 2),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 68, 0, 1),
+ BPF_STMT(BPF_RET|BPF_K, 0xffffffff), BPF_STMT(BPF_RET|BPF_K, 0),
+};
+
+static struct sock_fprog filter_prog = {
+ .len = ARRAY_LEN(filter_instr),
+ .filter = (struct sock_filter *) filter_instr,
+};
+
+// calculate options size.
+static int dhcp_opt_size(uint8_t *optionptr)
+{
+ int i = 0;
+ for(;optionptr[i] != 0xff; i++) if(optionptr[i] != 0x00) i += optionptr[i + 1] + 2 -1;
+ return i;
+}
+
+// calculates checksum for dhcp messages.
+static uint16_t dhcp_checksum(void *addr, int count)
+{
+ int32_t sum = 0;
+ uint16_t tmp = 0, *source = (uint16_t *)addr;
+
+ while (count > 1) {
+ sum += *source++;
+ count -= 2;
+ }
+ if (count > 0) {
+ *(uint8_t*)&tmp = *(uint8_t*)source;
+ sum += tmp;
+ }
+ while (sum >> 16) sum = (sum & 0xffff) + (sum >> 16);
+ return ~sum;
+}
+
+// gets information of INTERFACE and updates IFINDEX, MAC and IP
+static int get_interface( char *interface, int *ifindex, uint32_t *oip, uint8_t *mac)
+{
+ struct ifreq req;
+ struct sockaddr_in *ip;
+ int fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+
+ req.ifr_addr.sa_family = AF_INET;
+ strncpy(req.ifr_name, interface, IFNAMSIZ);
+ req.ifr_name[IFNAMSIZ-1] = '\0';
+
+ xioctl(fd, SIOCGIFFLAGS, &req);
+ if (!(req.ifr_flags & IFF_UP)) return -1;
+
+ if (oip) {
+ xioctl(fd, SIOCGIFADDR, &req);
+ ip = (struct sockaddr_in*) &req.ifr_addr;
+ dbg("IP %s\n", inet_ntoa(ip->sin_addr));
+ *oip = ntohl(ip->sin_addr.s_addr);
+ }
+ if (ifindex) {
+ xioctl(fd, SIOCGIFINDEX, &req);
+ dbg("Adapter index %d\n", req.ifr_ifindex);
+ *ifindex = req.ifr_ifindex;
+ }
+ if (mac) {
+ xioctl(fd, SIOCGIFHWADDR, &req);
+ memcpy(mac, req.ifr_hwaddr.sa_data, 6);
+ dbg("MAC %02x:%02x:%02x:%02x:%02x:%02x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+ }
+ close(fd);
+ return 0;
+}
+
+static int dhcp_daemon(void)
+{
+ int fd = open("/dev/null", O_RDWR);
+ if (fd < 0) fd = xcreate("/", O_RDONLY, 0666);
+ pid_t pid = fork();
+
+ if (pid < 0) perror_exit("DAEMON: failed to fork");
+ if (pid) exit(EXIT_SUCCESS);
+
+ setsid();
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ if (fd > 2) xclose(fd);
+
+ return 0;
+}
+
+/*
+ *logs messeges to syslog or console
+ *opening the log is still left with applet.
+ *FIXME: move to more relevent lib. probably libc.c
+ */
+static void infomsg(uint8_t infomode, char *s, ...)
+{
+ int used;
+ char *msg;
+ va_list p, t;
+
+ if (infomode == LOG_SILENT) return;
+ va_start(p, s);
+ va_copy(t, p);
+ used = vsnprintf(NULL, 0, s, t);
+ used++;
+ va_end(t);
+
+ msg = xmalloc(used);
+ vsnprintf(msg, used, s, p);
+ va_end(p);
+
+ if (infomode & LOG_SYSTEM) syslog(LOG_INFO, "%s", msg);
+ if (infomode & LOG_CONSOLE) printf("%s\n", msg);
+ free(msg);
+}
+
+/*
+ * Writes self PID in file PATH
+ * FIXME: libc implementation only writes in /var/run
+ * this is more generic as some implemenation may provide
+ * arguments to write in specific file. as dhcpd does.
+ */
+static void write_pid(char *path)
+{
+ int pidfile = open(path, O_CREAT | O_WRONLY | O_TRUNC, 0666);
+ if (pidfile > 0) {
+ char *pidbuf = utoa(getpid());
+ write(pidfile, pidbuf, strlen(pidbuf));
+ close(pidfile);
+ }
+}
+
+// String STR to UINT32 conversion strored in VAR
+static long strtou32( char *str)
+{
+ char *endptr = NULL;
+ int base = 10;
+ errno=0;
+ if (str[0]=='0' && (str[1]=='x' || str[1]=='X')) {
+ base = 16;
+ str+=2;
+ }
+ long ret_val = strtol(str, &endptr, base);
+ if (errno) return -1;
+ else if (endptr && (*endptr!='\0'||endptr == str)) return -1;
+ return ret_val;
+}
+
+// IP String STR to binary data.
+static int striptovar( char *str, void *var)
+{
+ in_addr_t addr;
+ if(!str) error_exit("NULL address string.");
+ addr = inet_addr(str);
+ if(addr == -1) error_exit("Wrong address %s.",str );
+ *((uint32_t*)(var)) = (uint32_t)addr;
+ return 0;
+}
+
+// String to dhcp option conversion
+static int strtoopt( char *str, uint8_t optonly)
+{
+ char *option, *valstr, *grp, *tp;
+ long optcode = 0, convtmp;
+ uint16_t flag = 0;
+ uint32_t mask, nip, router;
+ int count, size = ARRAY_LEN(options_list);
+
+ if (!*str) return 0;
+ option = strtok((char*)str, ":");
+ if (!option) return -1;
+
+ dbg("-x option : %s ", option);
+ optcode = strtou32(option);
+
+ if (optcode > 0 && optcode < 256) { // raw option
+ for (count = 0; count < size; count++) {
+ if ((options_list[count].code & 0X00FF) == optcode) {
+ flag = (options_list[count].code & 0XFF00);
+ break;
+ }
+ }
+ if (count == size) error_exit("Obsolete OR Unknown Option : %s", option);
+ } else { // string option
+ for (count = 0; count < size; count++) {
+ if (!strcmp(options_list[count].key, option)) {
+ flag = (options_list[count].code & 0XFF00);
+ optcode = (options_list[count].code & 0X00FF);
+ break;
+ }
+ }
+ if (count == size) error_exit("Obsolete OR Unknown Option : %s", option);
+ }
+ if (!flag || !optcode) return -1;
+ if (optonly) return optcode;
+
+ valstr = strtok(NULL, "\n");
+ if (!valstr) error_exit("option %s has no value defined.\n", option);
+ dbg(" value : %-20s \n ", valstr);
+ switch (flag) {
+ case DHCP_NUM32:
+ options_list[count].len = sizeof(uint32_t);
+ options_list[count].val = xmalloc(sizeof(uint32_t));
+ convtmp = strtou32(valstr);
+ if (convtmp < 0) error_exit("Invalid/wrong formated number %s", valstr);
+ convtmp = htonl(convtmp);
+ memcpy(options_list[count].val, &convtmp, sizeof(uint32_t));
+ break;
+ case DHCP_NUM16:
+ options_list[count].len = sizeof(uint16_t);
+ options_list[count].val = xmalloc(sizeof(uint16_t));
+ convtmp = strtou32(valstr);
+ if (convtmp < 0) error_exit("Invalid/malformed number %s", valstr);
+ convtmp = htons(convtmp);
+ memcpy(options_list[count].val, &convtmp, sizeof(uint16_t));
+ break;
+ case DHCP_NUM8:
+ options_list[count].len = sizeof(uint8_t);
+ options_list[count].val = xmalloc(sizeof(uint8_t));
+ convtmp = strtou32(valstr);
+ if (convtmp < 0) error_exit("Invalid/malformed number %s", valstr);
+ memcpy(options_list[count].val, &convtmp, sizeof(uint8_t));
+ break;
+ case DHCP_IP:
+ options_list[count].len = sizeof(uint32_t);
+ options_list[count].val = xmalloc(sizeof(uint32_t));
+ striptovar(valstr, options_list[count].val);
+ break;
+ case DHCP_STRING:
+ options_list[count].len = strlen(valstr);
+ options_list[count].val = strdup(valstr);
+ break;
+ case DHCP_IPLIST:
+ while(valstr){
+ options_list[count].val = xrealloc(options_list[count].val, options_list[count].len + sizeof(uint32_t));
+ striptovar(valstr, ((uint8_t*)options_list[count].val)+options_list[count].len);
+ options_list[count].len += sizeof(uint32_t);
+ valstr = strtok(NULL," \t");
+ }
+ break;
+ case DHCP_STRLST:
+ case DHCP_IPPLST:
+ break;
+ case DHCP_STCRTS:
+ /* Option binary format:
+ * mask [one byte, 0..32]
+ * ip [0..4 bytes depending on mask]
+ * router [4 bytes]
+ * may be repeated
+ * staticroutes 10.0.0.0/8 10.127.0.1, 10.11.12.0/24 10.11.12.1
+ */
+ grp = strtok(valstr, ",");;
+ while(grp){
+ while(*grp == ' ' || *grp == '\t') grp++;
+ tp = strchr(grp, '/');
+ if (!tp) error_exit("malformed static route option");
+ *tp = '\0';
+ mask = strtol(++tp, &tp, 10);
+ if (striptovar(grp, (uint8_t*)&nip) < 0) error_exit("malformed static route option");
+ while(*tp == ' ' || *tp == '\t' || *tp == '-') tp++;
+ if (striptovar(tp, (uint8_t*)&router) < 0) error_exit("malformed static route option");
+ options_list[count].val = xrealloc(options_list[count].val, options_list[count].len + 1 + mask/8 + 4);
+ memcpy(((uint8_t*)options_list[count].val)+options_list[count].len, &mask, 1);
+ options_list[count].len += 1;
+ memcpy(((uint8_t*)options_list[count].val)+options_list[count].len, &nip, mask/8);
+ options_list[count].len += mask/8;
+ memcpy(((uint8_t*)options_list[count].val)+options_list[count].len, &router, 4);
+ options_list[count].len += 4;
+ tp = NULL;
+ grp = strtok(NULL, ",");
+ }
+ break;
+ }
+ return 0;
+}
+
+// Creates environment pointers from RES to use in script
+static int fill_envp(dhcpc_result_t *res)
+{
+ struct in_addr temp;
+ int size = ARRAY_LEN(options_list), count, ret = -1;
+
+ ret = setenv("interface", state->iface, 1);
+ if (!res) return ret;
+ if (res->ipaddr.s_addr) {
+ temp.s_addr = htonl(res->ipaddr.s_addr);
+ ret = setenv("ip", inet_ntoa(temp), 1);
+ if (ret) return ret;
+ }
+ if (msgopt_list) {
+ for (count = 0; count < size; count++) {
+ if ((msgopt_list[count].len == 0) || (msgopt_list[count].val == NULL)) continue;
+ ret = setenv(msgopt_list[count].key, (char*)msgopt_list[count].val, 1);
+ if (ret) return ret;
+ }
+ }
+ return ret;
+}
+
+// Executes Script NAME.
+static void run_script(dhcpc_result_t *res, char *name)
+{
+ volatile int error = 0;
+ pid_t pid;
+ char *argv[3];
+ struct stat sts;
+ char *script = flag_get(FLAG_s, TT.script, "/usr/share/dhcp/default.script");
+
+ if (stat(script, &sts) == -1 && errno == ENOENT) return;
+ if (fill_envp(res)) {
+ dbg("Failed to create environment variables.");
+ return;
+ }
+ dbg("Executing %s %s\n", script, name);
+ argv[0] = (char*) script;
+ argv[1] = (char*) name;
+ argv[2] = NULL;
+ fflush(NULL);
+
+ pid = vfork();
+ if (pid < 0) {
+ dbg("Fork failed.\n");
+ return;
+ }
+ if (!pid) {
+ execvp(argv[0], argv);
+ error = errno;
+ _exit(111);
+ }
+ if (error) {
+ waitpid(pid, NULL,0);
+ errno = error;
+ perror_msg("script exec failed");
+ }
+ dbg("script complete.\n");
+}
+
+// returns a randome ID
+static uint32_t getxid(void)
+{
+ uint32_t randnum;
+ int fd = xopen("/dev/urandom", O_RDONLY);
+ xreadall(fd, &randnum, sizeof(randnum));
+ xclose(fd);
+ return randnum;
+}
+
+// opens socket in raw mode.
+static int mode_raw(void)
+{
+ state->mode = MODE_OFF;
+ struct sockaddr_ll sock;
+
+ if (state->sockfd > 0) close(state->sockfd);
+ dbg("Opening raw socket on ifindex %d\n", state->ifindex);
+
+ state->sockfd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
+ if (state->sockfd < 0) {
+ dbg("MODE RAW : socket fail ERROR : %d\n", state->sockfd);
+ return -1;
+ }
+ dbg("Got raw socket fd %d\n", state->sockfd);
+ memset(&sock, 0, sizeof(sock));
+ sock.sll_family = AF_PACKET;
+ sock.sll_protocol = htons(ETH_P_IP);
+ sock.sll_ifindex = state->ifindex;
+
+ if (bind(state->sockfd, (struct sockaddr *) &sock, sizeof(sock))) {
+ dbg("MODE RAW : bind fail.\n");
+ close(state->sockfd);
+ return -1;
+ }
+ state->mode = MODE_RAW;
+ if (setsockopt(state->sockfd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog, sizeof(filter_prog)) < 0)
+ dbg("MODE RAW : filter attach fail.\n");
+
+ dbg("MODE RAW : success\n");
+ return 0;
+}
+
+// opens UDP socket
+static int mode_app(void)
+{
+ struct sockaddr_in addr;
+ struct ifreq ifr;
+
+ state->mode = MODE_OFF;
+ if (state->sockfd > 0) close(state->sockfd);
+
+ dbg("Opening listen socket on *:%d %s\n", DHCPC_CLIENT_PORT, state->iface);
+ state->sockfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (state->sockfd < 0) {
+ dbg("MODE APP : socket fail ERROR: %d\n", state->sockfd);
+ return -1;
+ }
+ setsockopt(state->sockfd, SOL_SOCKET, SO_REUSEADDR, &set, sizeof(set));
+ if (setsockopt(state->sockfd, SOL_SOCKET, SO_BROADCAST, &set, sizeof(set)) == -1) {
+ dbg("MODE APP : brodcast failed.\n");
+ close(state->sockfd);
+ return -1;
+ }
+ strncpy(ifr.ifr_name, state->iface, IFNAMSIZ);
+ ifr.ifr_name[IFNAMSIZ -1] = '\0';
+ setsockopt(state->sockfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(DHCPC_CLIENT_PORT);
+ addr.sin_addr.s_addr = INADDR_ANY ;
+
+ if (bind(state->sockfd, (struct sockaddr *) &addr, sizeof(addr))) {
+ close(state->sockfd);
+ dbg("MODE APP : bind failed.\n");
+ return -1;
+ }
+ state->mode = MODE_APP;
+ dbg("MODE APP : success\n");
+ return 0;
+}
+
+static int read_raw(void)
+{
+ dhcp_raw_t packet;
+ uint16_t check;
+ int bytes = 0;
+
+ memset(&packet, 0, sizeof(packet));
+ if ((bytes = read(state->sockfd, &packet, sizeof(packet))) < 0) {
+ dbg("\tPacket read error, ignoring\n");
+ return bytes;
+ }
+ if (bytes < (int) (sizeof(packet.iph) + sizeof(packet.udph))) {
+ dbg("\tPacket is too short, ignoring\n");
+ return -2;
+ }
+ if (bytes < ntohs(packet.iph.tot_len)) {
+ dbg("\tOversized packet, ignoring\n");
+ return -2;
+ }
+ // ignore any extra garbage bytes
+ bytes = ntohs(packet.iph.tot_len);
+ // make sure its the right packet for us, and that it passes sanity checks
+ if (packet.iph.protocol != IPPROTO_UDP || packet.iph.version != IPVERSION
+ || packet.iph.ihl != (sizeof(packet.iph) >> 2)
+ || packet.udph.dest != htons(DHCPC_CLIENT_PORT)
+ || ntohs(packet.udph.len) != (uint16_t)(bytes - sizeof(packet.iph))) {
+ dbg("\tUnrelated/bogus packet, ignoring\n");
+ return -2;
+ }
+ // verify IP checksum
+ check = packet.iph.check;
+ packet.iph.check = 0;
+ if (check != dhcp_checksum(&packet.iph, sizeof(packet.iph))) {
+ dbg("\tBad IP header checksum, ignoring\n");
+ return -2;
+ }
+ memset(&packet.iph, 0, ((size_t) &((struct iphdr *)0)->protocol));
+ packet.iph.tot_len = packet.udph.len;
+ check = packet.udph.check;
+ packet.udph.check = 0;
+ if (check && check != dhcp_checksum(&packet, bytes)) {
+ dbg("\tPacket with bad UDP checksum received, ignoring\n");
+ return -2;
+ }
+ memcpy(&state->pdhcp, &packet.dhcp, bytes - (sizeof(packet.iph) + sizeof(packet.udph)));
+ if (state->pdhcp.cookie != htonl(DHCP_MAGIC)) {
+ dbg("\tPacket with bad magic, ignoring\n");
+ return -2;
+ }
+ return bytes - sizeof(packet.iph) - sizeof(packet.udph);
+}
+
+static int read_app(void)
+{
+ int ret;
+
+ memset(&state->pdhcp, 0, sizeof(dhcp_msg_t));
+ if ((ret = read(state->sockfd, &state->pdhcp, sizeof(dhcp_msg_t))) < 0) {
+ dbg("Packet read error, ignoring\n");
+ return ret; /* returns -1 */
+ }
+ if (state->pdhcp.cookie != htonl(DHCP_MAGIC)) {
+ dbg("Packet with bad magic, ignoring\n");
+ return -2;
+ }
+ return ret;
+}
+
+// Sends data through raw socket.
+static int send_raw(void)
+{
+ struct sockaddr_ll dest_sll;
+ dhcp_raw_t packet;
+ unsigned padding;
+ int fd, result = -1;
+
+ memset(&packet, 0, sizeof(dhcp_raw_t));
+ memcpy(&packet.dhcp, &state->pdhcp, sizeof(dhcp_msg_t));
+
+ if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
+ dbg("SEND RAW: socket failed\n");
+ return result;
+ }
+ memset(&dest_sll, 0, sizeof(dest_sll));
+ dest_sll.sll_family = AF_PACKET;
+ dest_sll.sll_protocol = htons(ETH_P_IP);
+ dest_sll.sll_ifindex = state->ifindex;
+ dest_sll.sll_halen = 6;
+ memcpy(dest_sll.sll_addr, bmacaddr , 6);
+
+ if (bind(fd, (struct sockaddr *) &dest_sll, sizeof(dest_sll)) < 0) {
+ dbg("SEND RAW: bind failed\n");
+ close(fd);
+ return result;
+ }
+ padding = 308 - 1 - dhcp_opt_size(state->pdhcp.options);
+ packet.iph.protocol = IPPROTO_UDP;
+ packet.iph.saddr = INADDR_ANY;
+ packet.iph.daddr = INADDR_BROADCAST;
+ packet.udph.source = htons(DHCPC_CLIENT_PORT);
+ packet.udph.dest = htons(DHCPC_SERVER_PORT);
+ packet.udph.len = htons(sizeof(dhcp_raw_t) - sizeof(struct iphdr) - padding);
+ packet.iph.tot_len = packet.udph.len;
+ packet.udph.check = dhcp_checksum(&packet, sizeof(dhcp_raw_t) - padding);
+ packet.iph.tot_len = htons(sizeof(dhcp_raw_t) - padding);
+ packet.iph.ihl = sizeof(packet.iph) >> 2;
+ packet.iph.version = IPVERSION;
+ packet.iph.ttl = IPDEFTTL;
+ packet.iph.check = dhcp_checksum(&packet.iph, sizeof(packet.iph));
+
+ result = sendto(fd, &packet, sizeof(dhcp_raw_t) - padding, 0,
+ (struct sockaddr *) &dest_sll, sizeof(dest_sll));
+
+ close(fd);
+ if (result < 0) dbg("SEND RAW: PACKET send error\n");
+ return result;
+}
+
+// Sends data through UDP socket.
+static int send_app(void)
+{
+ struct sockaddr_in cli;
+ int fd, ret = -1;
+
+ if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
+ dbg("SEND APP: sock failed.\n");
+ return ret;
+ }
+ setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &set, sizeof(set));
+
+ memset(&cli, 0, sizeof(cli));
+ cli.sin_family = AF_INET;
+ cli.sin_port = htons(DHCPC_CLIENT_PORT);
+ cli.sin_addr.s_addr = state->pdhcp.ciaddr;
+ if (bind(fd, (struct sockaddr *)&cli, sizeof(cli)) == -1) {
+ dbg("SEND APP: bind failed.\n");
+ goto error_fd;
+ }
+ memset(&cli, 0, sizeof(cli));
+ cli.sin_family = AF_INET;
+ cli.sin_port = htons(DHCPC_SERVER_PORT);
+ cli.sin_addr.s_addr = state->serverid.s_addr;
+ if (connect(fd, (struct sockaddr *)&cli, sizeof(cli)) == -1) {
+ dbg("SEND APP: connect failed.\n");
+ goto error_fd;
+ }
+ int padding = 308 - 1 - dhcp_opt_size(state->pdhcp.options);
+ if((ret = write(fd, &state->pdhcp, sizeof(dhcp_msg_t) - padding)) < 0) {
+ dbg("SEND APP: write failed error %d\n", ret);
+ goto error_fd;
+ }
+ dbg("SEND APP: write success wrote %d\n", ret);
+error_fd:
+ close(fd);
+ return ret;
+}
+
+// Generic signal handler real handling is done in main funcrion.
+static void signal_handler(int sig)
+{
+ unsigned char ch = sig;
+ if (write(sigfd.wr, &ch, 1) != 1) dbg("can't send signal\n");
+}
+
+// signal setup for SIGUSR1 SIGUSR2 SIGTERM
+static int setup_signal()
+{
+ if (pipe((int *)&sigfd) < 0) {
+ dbg("signal pipe failed\n");
+ return -1;
+ }
+ fcntl(sigfd.wr , F_SETFD, FD_CLOEXEC);
+ fcntl(sigfd.rd , F_SETFD, FD_CLOEXEC);
+ int flags = fcntl(sigfd.wr, F_GETFL);
+ fcntl(sigfd.wr, F_SETFL, flags | O_NONBLOCK);
+ signal(SIGUSR1, signal_handler);
+ signal(SIGUSR2, signal_handler);
+ signal(SIGTERM, signal_handler);
+
+ return 0;
+}
+
+// adds client id to dhcp packet
+static uint8_t *dhcpc_addclientid(uint8_t *optptr)
+{
+ *optptr++ = DHCP_OPTION_CLIENTID;
+ *optptr++ = 7;
+ *optptr++ = 1;
+ memcpy(optptr, &state->macaddr, 6);
+ return optptr + 6;
+}
+
+// adds messege type to dhcp packet
+static uint8_t *dhcpc_addmsgtype(uint8_t *optptr, uint8_t type)
+{
+ *optptr++ = DHCP_OPTION_MSG_TYPE;
+ *optptr++ = 1;
+ *optptr++ = type;
+ return optptr;
+}
+
+// adds max size to dhcp packet
+static uint8_t *dhcpc_addmaxsize(uint8_t *optptr, uint16_t size)
+{
+ *optptr++ = DHCP_OPTION_MAX_SIZE;
+ *optptr++ = 2;
+ memcpy(optptr, &size, 2);
+ return optptr + 2;
+}
+
+static uint8_t *dhcpc_addstropt(uint8_t *optptr, uint8_t opcode, char* str, int len)
+{
+ *optptr++ = opcode;
+ *optptr++ = len;
+ memcpy(optptr, str, len);
+ return optptr + len;
+}
+
+// adds server id to dhcp packet.
+static uint8_t *dhcpc_addserverid(struct in_addr *serverid, uint8_t *optptr)
+{
+ *optptr++ = DHCP_OPTION_SERVER_ID;
+ *optptr++ = 4;
+ memcpy(optptr, &serverid->s_addr, 4);
+ return optptr + 4;
+}
+
+// adds requested ip address to dhcp packet.
+static uint8_t *dhcpc_addreqipaddr(struct in_addr *ipaddr, uint8_t *optptr)
+{
+ *optptr++ = DHCP_OPTION_REQ_IPADDR;
+ *optptr++ = 4;
+ memcpy(optptr, &ipaddr->s_addr, 4);
+ return optptr + 4;
+}
+
+// adds hostname to dhcp packet.
+static uint8_t *dhcpc_addfdnname(uint8_t *optptr, char *hname)
+{
+ int size = strlen(hname);
+ *optptr++ = DHCP_OPTION_FQDN;
+ *optptr++ = size + 3;
+ *optptr++ = 0x1; //flags
+ optptr += 2; // two blank bytes
+ strncpy((char*)optptr, hname, size); // name
+ return optptr + size;
+}
+
+// adds request options using -o,-O flag to dhcp packet
+static uint8_t *dhcpc_addreqoptions(uint8_t *optptr)
+{
+ uint8_t *len;
+
+ *optptr++ = DHCP_OPTION_REQ_LIST;
+ len = optptr;
+ *len = 0;
+ optptr++;
+
+ if (!flag_chk(FLAG_o)) {
+ *len = 4;
+ *optptr++ = DHCP_OPTION_SUBNET_MASK;
+ *optptr++ = DHCP_OPTION_ROUTER;
+ *optptr++ = DHCP_OPTION_DNS_SERVER;
+ *optptr++ = DHCP_OPTION_BROADCAST;
+ }
+ if (flag_chk(FLAG_O)) {
+ memcpy(optptr++, raw_opt, raw_optcount);
+ *len += raw_optcount;
+ }
+ return optptr;
+}
+
+static uint8_t *dhcpc_addend(uint8_t *optptr)
+{
+ *optptr++ = DHCP_OPTION_END;
+ return optptr;
+}
+
+// Sets values of -x options in dhcp discover and request packet.
+static uint8_t* set_xopt(uint8_t *optptr)
+{
+ int count;
+ int size = ARRAY_LEN(options_list);
+ for (count = 0; count < size; count++) {
+ if ((options_list[count].len == 0) || (options_list[count].val == NULL)) continue;
+ *optptr++ = (uint8_t) (options_list[count].code & 0x00FF);
+ *optptr++ = (uint8_t) options_list[count].len;
+ memcpy(optptr, options_list[count].val, options_list[count].len);
+ optptr += options_list[count].len;
+ }
+ return optptr;
+}
+
+static uint32_t get_option_serverid (uint8_t *opt, dhcpc_result_t *presult)
+{
+ uint32_t var = 0;
+ while (*opt != DHCP_OPTION_SERVER_ID) {
+ if (*opt == DHCP_OPTION_END) return var;
+ opt += opt[1] + 2;
+ }
+ memcpy(&var, opt+2, sizeof(uint32_t));
+ state->serverid.s_addr = var;
+ presult->serverid.s_addr = state->serverid.s_addr;
+ presult->serverid.s_addr = ntohl(presult->serverid.s_addr);
+ return var;
+}
+
+static uint8_t get_option_msgtype(uint8_t *opt)
+{
+ uint32_t var = 0;
+ while (*opt != DHCP_OPTION_MSG_TYPE) {
+ if (*opt == DHCP_OPTION_END) return var;
+ opt += opt[1] + 2;
+ }
+ memcpy(&var, opt+2, sizeof(uint8_t));
+ return var;
+}
+
+static uint8_t get_option_lease(uint8_t *opt, dhcpc_result_t *presult)
+{
+ uint32_t var = 0;
+ while (*opt != DHCP_OPTION_LEASE_TIME) {
+ if (*opt == DHCP_OPTION_END) return var;
+ opt += opt[1] + 2;
+ }
+ memcpy(&var, opt+2, sizeof(uint32_t));
+ var = htonl(var);
+ presult->lease_time = var;
+ return var;
+}
+
+
+// sends dhcp msg of MSGTYPE
+static int dhcpc_sendmsg(int msgtype)
+{
+ uint8_t *pend;
+ struct in_addr rqsd;
+ char *vendor;
+
+ // Create the common message header settings
+ memset(&state->pdhcp, 0, sizeof(dhcp_msg_t));
+ state->pdhcp.op = DHCP_REQUEST;
+ state->pdhcp.htype = DHCP_HTYPE_ETHERNET;
+ state->pdhcp.hlen = 6;
+ state->pdhcp.xid = xid;
+ memcpy(state->pdhcp.chaddr, state->macaddr, 6);
+ memset(&state->pdhcp.chaddr[6], 0, 10);
+ state->pdhcp.cookie = htonl(DHCP_MAGIC);;
+
+ // Add the common header options
+ pend = state->pdhcp.options;
+ pend = dhcpc_addmsgtype(pend, msgtype);
+
+ if (!flag_chk(FLAG_C)) pend = dhcpc_addclientid(pend);
+ // Handle the message specific settings
+ switch (msgtype) {
+ case DHCPDISCOVER: // Broadcast DISCOVER message to all servers
+ state->pdhcp.flags = htons(BOOTP_BROADCAST); // Broadcast bit.
+ if (flag_chk(FLAG_r)) {
+ inet_aton(TT.req_ip, &rqsd);
+ pend = dhcpc_addreqipaddr(&rqsd, pend);
+ }
+ pend = dhcpc_addmaxsize(pend, htons(sizeof(dhcp_raw_t)));
+ vendor = flag_get(FLAG_V, TT.vendor_cls, "toybox\0");
+ pend = dhcpc_addstropt(pend, DHCP_OPTION_VENDOR, vendor, strlen(vendor));
+ if (flag_chk(FLAG_H)) pend = dhcpc_addstropt(pend, DHCP_OPTION_HOST_NAME, TT.hostname, strlen(TT.hostname));
+ if (flag_chk(FLAG_F)) pend = dhcpc_addfdnname(pend, TT.fdn_name);
+ if ((!flag_chk(FLAG_o)) || flag_chk(FLAG_O)) pend = dhcpc_addreqoptions(pend);
+ if (flag_chk(FLAG_x)) pend = set_xopt(pend);
+ break;
+ case DHCPREQUEST: // Send REQUEST message to the server that sent the *first* OFFER
+ state->pdhcp.flags = htons(BOOTP_BROADCAST); // Broadcast bit.
+ if (state->status == STATE_RENEWING) memcpy(&state->pdhcp.ciaddr, &state->ipaddr.s_addr, 4);
+ pend = dhcpc_addmaxsize(pend, htons(sizeof(dhcp_raw_t)));
+ rqsd.s_addr = htonl(server);
+ pend = dhcpc_addserverid(&rqsd, pend);
+ pend = dhcpc_addreqipaddr(&state->ipaddr, pend);
+ vendor = flag_get(FLAG_V, TT.vendor_cls, "toybox\0");
+ pend = dhcpc_addstropt(pend, DHCP_OPTION_VENDOR, vendor, strlen(vendor));
+ if (flag_chk(FLAG_H)) pend = dhcpc_addstropt(pend, DHCP_OPTION_HOST_NAME, TT.hostname, strlen(TT.hostname));
+ if (flag_chk(FLAG_F)) pend = dhcpc_addfdnname(pend, TT.fdn_name);
+ if ((!flag_chk(FLAG_o)) || flag_chk(FLAG_O)) pend = dhcpc_addreqoptions(pend);
+ if (flag_chk(FLAG_x)) pend = set_xopt(pend);
+ break;
+ case DHCPRELEASE: // Send RELEASE message to the server.
+ memcpy(&state->pdhcp.ciaddr, &state->ipaddr.s_addr, 4);
+ rqsd.s_addr = htonl(server);
+ pend = dhcpc_addserverid(&rqsd, pend);
+ break;
+ default:
+ return -1;
+ }
+ pend = dhcpc_addend(pend);
+
+ if (state->mode == MODE_APP) return send_app();
+ return send_raw();
+}
+
+/*
+ * parses options from received dhcp packet at OPTPTR and
+ * stores result in PRESULT or MSGOPT_LIST
+ */
+static uint8_t dhcpc_parseoptions(dhcpc_result_t *presult, uint8_t *optptr)
+{
+ uint8_t type = 0, *options, overloaded = 0;;
+ uint16_t flag = 0;
+ uint32_t convtmp = 0;
+ char *dest, *pfx;
+ struct in_addr addr;
+ int count, optlen, size = ARRAY_LEN(options_list);
+
+ if (flag_chk(FLAG_x)) {
+ if(msgopt_list){
+ for (count = 0; count < size; count++){
+ if(msgopt_list[count].val) free(msgopt_list[count].val);
+ msgopt_list[count].val = NULL;
+ msgopt_list[count].len = 0;
+ }
+ } else {
+ msgopt_list = xmalloc(sizeof(options_list));
+ memcpy(msgopt_list, options_list, sizeof(options_list));
+ for (count = 0; count < size; count++) {
+ msgopt_list[count].len = 0;
+ msgopt_list[count].val = NULL;
+ }
+ }
+ } else {
+ msgopt_list = options_list;
+ for (count = 0; count < size; count++) {
+ msgopt_list[count].len = 0;
+ if(msgopt_list[count].val) free(msgopt_list[count].val);
+ msgopt_list[count].val = NULL;
+ }
+ }
+
+ while (*optptr != DHCP_OPTION_END) {
+ while (*optptr == DHCP_OPTION_PADDING) optptr++;
+ if (*optptr == DHCP_OPTION_OVERLOAD) {
+ overloaded = optptr[2];
+ optptr += optptr[1] + 2;
+ continue;
+ }
+ for (count = 0, flag = 0; count < size; count++) {
+ if ((msgopt_list[count].code & 0X00FF) == *optptr) {
+ flag = (msgopt_list[count].code & 0XFF00);
+ break;
+ }
+ }
+ switch (flag) {
+ case DHCP_NUM32:
+ memcpy(&convtmp, &optptr[2], sizeof(uint32_t));
+ convtmp = htonl(convtmp);
+ sprintf(toybuf, "%u", convtmp);
+ msgopt_list[count].val = strdup(toybuf);
+ msgopt_list[count].len = strlen(toybuf);
+ break;
+ case DHCP_NUM16:
+ memcpy(&convtmp, &optptr[2], sizeof(uint16_t));
+ convtmp = htons(convtmp);
+ sprintf(toybuf, "%u", convtmp);
+ msgopt_list[count].val = strdup(toybuf);
+ msgopt_list[count].len = strlen(toybuf);
+ break;
+ case DHCP_NUM8:
+ memcpy(&convtmp, &optptr[2], sizeof(uint8_t));
+ sprintf(toybuf, "%u", convtmp);
+ msgopt_list[count].val = strdup(toybuf);
+ msgopt_list[count].len = strlen(toybuf);
+ break;
+ case DHCP_IP:
+ memcpy(&convtmp, &optptr[2], sizeof(uint32_t));
+ addr.s_addr = convtmp;
+ sprintf(toybuf, "%s", inet_ntoa(addr));
+ msgopt_list[count].val = strdup(toybuf);
+ msgopt_list[count].len = strlen(toybuf);
+ break;
+ case DHCP_STRING:
+ sprintf(toybuf, "%.*s", optptr[1], &optptr[2]);
+ msgopt_list[count].val = strdup(toybuf);
+ msgopt_list[count].len = strlen(toybuf);
+ break;
+ case DHCP_IPLIST:
+ optlen = optptr[1];
+ dest = toybuf;
+ while (optlen) {
+ memcpy(&convtmp, &optptr[2], sizeof(uint32_t));
+ addr.s_addr = convtmp;
+ dest += sprintf(dest, "%s ", inet_ntoa(addr));
+ optlen -= 4;
+ }
+ *(dest - 1) = '\0';
+ msgopt_list[count].val = strdup(toybuf);
+ msgopt_list[count].len = strlen(toybuf);
+ break;
+ case DHCP_STRLST: //FIXME: do smthing.
+ case DHCP_IPPLST:
+ break;
+ case DHCP_STCRTS:
+ pfx = "";
+ dest = toybuf;
+ options = &optptr[2];
+ optlen = optptr[1];
+
+ while (optlen >= 1 + 4) {
+ uint32_t nip = 0;
+ int bytes;
+ uint8_t *p_tmp;
+ unsigned mask = *options;
+
+ if (mask > 32) break;
+ optlen--;
+ p_tmp = (void*) &nip;
+ bytes = (mask + 7) / 8;
+ while (--bytes >= 0) {
+ *p_tmp++ = *options++;
+ optlen--;
+ }
+ if (optlen < 4) break;
+ dest += sprintf(dest, "%s%u.%u.%u.%u", pfx, ((uint8_t*) &nip)[0],
+ ((uint8_t*) &nip)[1], ((uint8_t*) &nip)[2], ((uint8_t*) &nip)[3]);
+ pfx = " ";
+ dest += sprintf(dest, "/%u ", mask);
+ dest += sprintf(dest, "%u.%u.%u.%u", options[0], options[1], options[2], options[3]);
+ options += 4;
+ optlen -= 4;
+ }
+ msgopt_list[count].val = strdup(toybuf);
+ msgopt_list[count].len = strlen(toybuf);
+ break;
+ default: break;
+ }
+ optptr += optptr[1] + 2;
+ }
+ if ((overloaded == 1) || (overloaded == 3)) dhcpc_parseoptions(presult, optptr);
+ if ((overloaded == 2) || (overloaded == 3)) dhcpc_parseoptions(presult, optptr);
+ return type;
+}
+
+// parses recvd messege to check that it was for us.
+static uint8_t dhcpc_parsemsg(dhcpc_result_t *presult)
+{
+ if (state->pdhcp.op == DHCP_REPLY
+ && !memcmp(state->pdhcp.chaddr, state->macaddr, 6)
+ && !memcmp(&state->pdhcp.xid, &xid, sizeof(xid))) {
+ memcpy(&presult->ipaddr.s_addr, &state->pdhcp.yiaddr, 4);
+ presult->ipaddr.s_addr = ntohl(presult->ipaddr.s_addr);
+ return get_option_msgtype(state->pdhcp.options);
+ }
+ return 0;
+}
+
+// Sends a IP renew request.
+static void renew(void)
+{
+ infomsg(infomode, "Performing a DHCP renew");
+ switch (state->status) {
+ case STATE_INIT:
+ break;
+ case STATE_BOUND:
+ mode_raw();
+ case STATE_RENEWING: // FALLTHROUGH
+ case STATE_REBINDING: // FALLTHROUGH
+ state->status = STATE_RENEW_REQUESTED;
+ break;
+ case STATE_RENEW_REQUESTED:
+ run_script(NULL, "deconfig");
+ case STATE_REQUESTING: // FALLTHROUGH
+ case STATE_RELEASED: // FALLTHROUGH
+ mode_raw();
+ state->status = STATE_INIT;
+ break;
+ default: break;
+ }
+}
+
+// Sends a IP release request.
+static void release(void)
+{
+ int len = sizeof("255.255.255.255\0");
+ char buffer[len];
+ struct in_addr temp_addr;
+
+ mode_app();
+ // send release packet
+ if (state->status == STATE_BOUND || state->status == STATE_RENEWING || state->status == STATE_REBINDING) {
+ temp_addr.s_addr = htonl(server);
+ strncpy(buffer, inet_ntoa(temp_addr), sizeof(buffer));
+ buffer[len - 1] = '\0';
+ temp_addr.s_addr = state->ipaddr.s_addr;
+ infomsg( infomode, "Unicasting a release of %s to %s", inet_ntoa(temp_addr), buffer);
+ dhcpc_sendmsg(DHCPRELEASE);
+ run_script(NULL, "deconfig");
+ }
+ infomsg(infomode, "Entering released state");
+ close(state->sockfd);
+ state->sockfd = -1;
+ state->mode = MODE_OFF;
+ state->status = STATE_RELEASED;
+}
+
+static void free_option_stores(void)
+{
+ int count, size = ARRAY_LEN(options_list);
+ for (count = 0; count < size; count++)
+ if (options_list[count].val) free(options_list[count].val);
+ if(flag_chk(FLAG_x)){
+ for (count = 0; count < size; count++)
+ if (msgopt_list[count].val) free(msgopt_list[count].val);
+ free(msgopt_list);
+ }
+}
+
+void dhcp_main(void)
+{
+ struct timeval tv;
+ int retval, bufflen = 0;
+ dhcpc_result_t result;
+ uint8_t packets = 0, retries = 0;
+ uint32_t timeout = 0, waited = 0;
+ fd_set rfds;
+
+ xid = 0;
+ setlinebuf(stdout);
+ dbg = dummy;
+ if (flag_chk(FLAG_v)) dbg = xprintf;
+ if (flag_chk(FLAG_p)) write_pid(TT.pidfile);
+ retries = flag_get(FLAG_t, TT.retries, 3);
+ if (flag_chk(FLAG_S)) {
+ openlog("UDHCPC :", LOG_PID, LOG_DAEMON);
+ infomode |= LOG_SYSTEM;
+ }
+ infomsg(infomode, "dhcp started");
+ if (flag_chk(FLAG_O)) {
+ while (TT.req_opt) {
+ raw_opt[raw_optcount] = (uint8_t) strtoopt(TT.req_opt->arg, 1);
+ raw_optcount++;
+ TT.req_opt = TT.req_opt->next;
+ }
+ }
+ if (flag_chk(FLAG_x)) {
+ while (TT.pkt_opt) {
+ (void) strtoopt(TT.pkt_opt->arg, 0);
+ TT.pkt_opt = TT.pkt_opt->next;
+ }
+ }
+ memset(&result, 0, sizeof(dhcpc_result_t));
+ state = (dhcpc_state_t*) xmalloc(sizeof(dhcpc_state_t));
+ memset(state, 0, sizeof(dhcpc_state_t));
+ state->iface = flag_get(FLAG_i, TT.iface, "eth0");
+
+ if (get_interface(state->iface, &state->ifindex, NULL, state->macaddr))
+ perror_exit("Failed to get interface %s", state->iface);
+
+ run_script(NULL, "deconfig");
+ setup_signal();
+ state->status = STATE_INIT;
+ mode_raw();
+ fcntl(state->sockfd, F_SETFD, FD_CLOEXEC);
+
+ for (;;) {
+ FD_ZERO(&rfds);
+ if (state->sockfd >= 0) FD_SET(state->sockfd, &rfds);
+ FD_SET(sigfd.rd, &rfds);
+ tv.tv_sec = timeout - waited;
+ tv.tv_usec = 0;
+ retval = 0;
+
+ int maxfd = (sigfd.rd > state->sockfd)? sigfd.rd : state->sockfd;
+ dbg("select wait ....\n");
+ uint32_t timestmp = time(NULL);
+ if((retval = select(maxfd + 1, &rfds, NULL, NULL, &tv)) < 0) {
+ if (errno == EINTR) {
+ waited += (unsigned) time(NULL) - timestmp;
+ continue;
+ }
+ perror_exit("Error in select");
+ }
+ if (!retval) { // Timed out
+ if (get_interface(state->iface, &state->ifindex, NULL, state->macaddr))
+ error_exit("Interface lost %s\n", state->iface);
+
+ switch (state->status) {
+ case STATE_INIT:
+ if (packets < retries) {
+ if (!packets) xid = getxid();
+ run_script(NULL, "deconfig");
+ infomsg(infomode, "Sending discover...");
+ dhcpc_sendmsg(DHCPDISCOVER);
+ server = 0;
+ timeout = flag_get(FLAG_T, TT.timeout, 3);
+ waited = 0;
+ packets++;
+ continue;
+ }
+lease_fail:
+ run_script(NULL,"leasefail");
+ if (flag_chk(FLAG_n)) {
+ infomsg(infomode, "Lease failed. Exiting");
+ goto ret_with_sockfd;
+ }
+ if (flag_chk(FLAG_b)) {
+ infomsg(infomode, "Lease failed. Going Daemon mode");
+ dhcp_daemon();
+ if (flag_chk(FLAG_p)) write_pid(TT.pidfile);
+ toys.optflags &= ~FLAG_b;
+ toys.optflags |= FLAG_f;
+ }
+ timeout = flag_get(FLAG_A, TT.tryagain, 20);
+ waited = 0;
+ packets = 0;
+ continue;
+ case STATE_REQUESTING:
+ if (packets < retries) {
+ memcpy(&state->ipaddr.s_addr,&state->pdhcp.yiaddr, 4);
+ dhcpc_sendmsg(DHCPREQUEST);
+ infomsg(infomode, "Sending select for %d.%d.%d.%d...",
+ (result.ipaddr.s_addr >> 24) & 0xff, (result.ipaddr.s_addr >> 16) & 0xff, (result.ipaddr.s_addr >> 8) & 0xff, (result.ipaddr.s_addr) & 0xff);
+ timeout = flag_get(FLAG_T, TT.timeout, 3);
+ waited = 0;
+ packets++;
+ continue;
+ }
+ mode_raw();
+ state->status = STATE_INIT;
+ goto lease_fail;
+ case STATE_BOUND:
+ state->status = STATE_RENEWING;
+ dbg("Entering renew state\n");
+ // FALLTHROUGH
+ case STATE_RENEW_REQUESTED: // FALLTHROUGH
+ case STATE_RENEWING:
+renew_requested:
+ if (timeout > 60) {
+ dhcpc_sendmsg(DHCPREQUEST);
+ timeout >>= 1;
+ waited = 0;
+ continue;
+ }
+ dbg("Entering rebinding state\n");
+ state->status = STATE_REBINDING;
+ // FALLTHROUGH
+ case STATE_REBINDING:
+ mode_raw();
+ if (timeout > 0) {
+ dhcpc_sendmsg(DHCPREQUEST);
+ timeout >>= 1;
+ waited = 0;
+ continue;
+ }
+ infomsg(infomode, "Lease lost, entering INIT state");
+ run_script(NULL, "deconfig");
+ state->status = STATE_INIT;
+ timeout = 0;
+ waited = 0;
+ packets = 0;
+ continue;
+ default: break;
+ }
+ timeout = INT_MAX;
+ waited = 0;
+ continue;
+ }
+ if (FD_ISSET(sigfd.rd, &rfds)) { // Some Activity on RDFDs : is signal
+ unsigned char sig;
+ if (read(sigfd.rd, &sig, 1) != 1) {
+ dbg("signal read failed.\n");
+ continue;
+ }
+ switch (sig) {
+ case SIGUSR1:
+ infomsg(infomode, "Received SIGUSR1");
+ renew();
+ packets = 0;
+ waited = 0;
+ if (state->status == STATE_RENEW_REQUESTED) goto renew_requested;
+ if (state->status == STATE_INIT) timeout = 0;
+ continue;
+ case SIGUSR2:
+ infomsg(infomode, "Received SIGUSR2");
+ release();
+ timeout = INT_MAX;
+ waited = 0;
+ packets = 0;
+ continue;
+ case SIGTERM:
+ infomsg(infomode, "Received SIGTERM");
+ if (flag_chk(FLAG_R)) release();
+ goto ret_with_sockfd;
+ default: break;
+ }
+ }
+ if (FD_ISSET(state->sockfd, &rfds)) { // Some Activity on RDFDs : is socket
+ dbg("main sock read\n");
+ uint8_t msgType;
+ if (state->mode == MODE_RAW) bufflen = read_raw();
+ if (state->mode == MODE_APP) bufflen = read_app();
+ if (bufflen < 0) {
+ if (state->mode == MODE_RAW) mode_raw();
+ if (state->mode == MODE_APP) mode_app();
+ continue;
+ }
+ waited += time(NULL) - timestmp;
+ memset(&result, 0, sizeof(dhcpc_result_t));
+ msgType = dhcpc_parsemsg(&result);
+ if (msgType != DHCPNAK && result.ipaddr.s_addr == 0 ) continue; // no ip for me ignore
+ if (!msgType || !get_option_serverid(state->pdhcp.options, &result)) continue; //no server id ignore
+ if (msgType == DHCPOFFER && server == 0) server = result.serverid.s_addr; // select the server
+ if (result.serverid.s_addr != server) continue; // not from the server we requested ignore
+ dhcpc_parseoptions(&result, state->pdhcp.options);
+ get_option_lease(state->pdhcp.options, &result);
+
+ switch (state->status) {
+ case STATE_INIT:
+ if (msgType == DHCPOFFER) {
+ state->status = STATE_REQUESTING;
+ mode_raw();
+ timeout = 0;
+ waited = 0;
+ packets = 0;
+ }
+ continue;
+ case STATE_REQUESTING: // FALLTHROUGH
+ case STATE_RENEWING: // FALLTHROUGH
+ case STATE_RENEW_REQUESTED: // FALLTHROUGH
+ case STATE_REBINDING:
+ if (msgType == DHCPACK) {
+ timeout = result.lease_time / 2;
+ run_script(&result, state->status == STATE_REQUESTING ? "bound" : "renew");
+ state->status = STATE_BOUND;
+ infomsg(infomode, "Lease of %d.%d.%d.%d obtained, lease time %d from server %d.%d.%d.%d",
+ (result.ipaddr.s_addr >> 24) & 0xff, (result.ipaddr.s_addr >> 16) & 0xff, (result.ipaddr.s_addr >> 8) & 0xff, (result.ipaddr.s_addr) & 0xff,
+ result.lease_time,
+ (result.serverid.s_addr >> 24) & 0xff, (result.serverid.s_addr >> 16) & 0xff, (result.serverid.s_addr >> 8) & 0xff, (result.serverid.s_addr) & 0xff);
+ if (flag_chk(FLAG_q)) {
+ if (flag_chk(FLAG_R)) release();
+ goto ret_with_sockfd;
+ }
+ toys.optflags &= ~FLAG_n;
+ if (!flag_chk(FLAG_f)) {
+ dhcp_daemon();
+ toys.optflags |= FLAG_f;
+ if (flag_chk(FLAG_p)) write_pid(TT.pidfile);
+ }
+ waited = 0;
+ continue;
+ } else if (msgType == DHCPNAK) {
+ dbg("NACK received.\n");
+ run_script(&result, "nak");
+ if (state->status != STATE_REQUESTING) run_script(NULL, "deconfig");
+ mode_raw();
+ sleep(3);
+ state->status = STATE_INIT;
+ state->ipaddr.s_addr = 0;
+ server = 0;
+ timeout = 0;
+ packets = 0;
+ waited = 0;
+ }
+ continue;
+ default: break;
+ }
+ }
+ }
+ret_with_sockfd:
+ if (CFG_TOYBOX_FREE) {
+ free_option_stores();
+ if (state->sockfd > 0) close(state->sockfd);
+ free(state);
+ }
+}
diff --git a/toys/pending/dhcpd.c b/toys/pending/dhcpd.c
new file mode 100644
index 00000000..18f4f25e
--- /dev/null
+++ b/toys/pending/dhcpd.c
@@ -0,0 +1,1247 @@
+/* dhcpd.c - DHCP server for dynamic network configuration.
+ *
+ * Copyright 2013 Madhur Verma <mad.flexi@gmail.com>
+ * Copyright 2013 Kyungwan Han <asura321@gamil.com>
+ *
+ * No Standard
+USE_DHCPD(NEWTOY(dhcpd, ">1P#<0>65535=67fS", TOYFLAG_SBIN|TOYFLAG_ROOTONLY))
+
+config DHCPD
+ bool "dhcpd"
+ default n
+ help
+ Usage: dhcpd [-fS] [-P N] [CONFFILE]
+
+ -f Run in foreground
+ -S Log to syslog too
+ -P N Use port N (default 67)
+
+config DEBUG_DHCP
+ bool "debugging messeges ON/OFF"
+ default n
+ depends on DHCPD
+*/
+
+#define FOR_dhcpd
+
+#include "toys.h"
+#include "toynet.h"
+#include <linux/sockios.h>
+#include <linux/if_ether.h>
+
+// Todo: headers not in posix
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+#include <netpacket/packet.h>
+
+#if CFG_DEBUG_DHCP==1
+# define dbg(fmt, arg...) printf(fmt, ##arg)
+#else
+# define dbg(fmt, arg...)
+#endif
+
+#define flag_get(f,v,d) ((toys.optflags & (f)) ? (v) : (d))
+#define flag_chk(f) ((toys.optflags & (f)) ? 1 : 0)
+
+#define LOG_SILENT 0x0
+#define LOG_CONSOLE 0x1
+#define LOG_SYSTEM 0x2
+
+#define DHCP_MAGIC 0x63825363
+
+#define DHCPDISCOVER 1
+#define DHCPOFFER 2
+#define DHCPREQUEST 3
+#define DHCPDECLINE 4
+#define DHCPACK 5
+#define DHCPNAK 6
+#define DHCPRELEASE 7
+#define DHCPINFORM 8
+
+#define DHCP_NUM8 (1<<8)
+#define DHCP_NUM16 (1<<9)
+#define DHCP_NUM32 DHCP_NUM16 | DHCP_NUM8
+#define DHCP_STRING (1<<10)
+#define DHCP_STRLST (1<<11)
+#define DHCP_IP (1<<12)
+#define DHCP_IPLIST (1<<13)
+#define DHCP_IPPLST (1<<14)
+#define DHCP_STCRTS (1<<15)
+
+// DHCP option codes (partial list). See RFC 2132 and
+#define DHCP_OPT_PADDING 0x00
+#define DHCP_OPT_HOST_NAME DHCP_STRING | 0x0c // either client informs server or server gives name to client
+#define DHCP_OPT_REQUESTED_IP DHCP_IP | 0x32 // sent by client if specific IP is wanted
+#define DHCP_OPT_LEASE_TIME DHCP_NUM32 | 0x33
+#define DHCP_OPT_OPTION_OVERLOAD 0x34
+#define DHCP_OPT_MESSAGE_TYPE DHCP_NUM8 | 0x35
+#define DHCP_OPT_SERVER_ID DHCP_IP | 0x36 // by default server's IP
+#define DHCP_OPT_PARAM_REQ DHCP_STRING | 0x37 // list of options client wants
+#define DHCP_OPT_END 0xff
+
+GLOBALS(
+ long port;
+);
+
+typedef struct __attribute__((packed)) dhcp_msg_s {
+ uint8_t op;
+ uint8_t htype;
+ uint8_t hlen;
+ uint8_t hops;
+ uint32_t xid;
+ uint16_t secs;
+ uint16_t flags;
+ uint32_t ciaddr;
+ uint32_t yiaddr;
+ uint32_t nsiaddr;
+ uint32_t ngiaddr;
+ uint8_t chaddr[16];
+ uint8_t sname[64];
+ uint8_t file[128];
+ uint32_t cookie;
+ uint8_t options[308];
+} dhcp_msg_t;
+
+typedef struct __attribute__((packed)) dhcp_raw_s {
+ struct iphdr iph;
+ struct udphdr udph;
+ dhcp_msg_t dhcp;
+} dhcp_raw_t;
+
+typedef struct static_lease_s {
+ struct static_lease_s *next;
+ uint32_t nip;
+ int mac[6];
+} static_lease;
+
+typedef struct {
+ uint32_t expires;
+ uint32_t lease_nip;
+ uint8_t lease_mac[6];
+ char hostname[20];
+ uint8_t pad[2];
+} dyn_lease;
+
+typedef struct option_val_s {
+ char *key;
+ uint16_t code;
+ void *val;
+ size_t len;
+} option_val_t;
+
+typedef struct __attribute__((__may_alias__)) server_config_s {
+ char *interface; // interface to use
+ int ifindex;
+ uint32_t server_nip;
+ uint32_t port;
+ uint8_t server_mac[6]; // our MAC address (used only for ARP probing)
+ void *options[256]; // list of DHCP options loaded from the config file
+ /* start,end are in host order: we need to compare start <= ip <= end*/
+ uint32_t start_ip; // start address of leases, in host order
+ uint32_t end_ip; // end of leases, in host order
+ uint32_t max_lease_sec; // maximum lease time (host order)
+ uint32_t min_lease_sec; // minimum lease time a client can request
+ uint32_t max_leases; // maximum number of leases (including reserved addresses)
+ uint32_t auto_time; // how long should dhcpd wait before writing a config file.
+ // if this is zero, it will only write one on SIGUSR1
+ uint32_t decline_time; // how long an address is reserved if a client returns a
+ // decline message
+ uint32_t conflict_time; // how long an arp conflict offender is leased for
+ uint32_t offer_time; // how long an offered address is reserved
+ uint32_t siaddr_nip; // "next server" bootp option
+ char *lease_file;
+ char *pidfile;
+ char *notify_file; // what to run whenever leases are written
+ char *sname; // bootp server name
+ char *boot_file; // bootp boot file option
+ struct static_lease *static_leases; // List of ip/mac pairs to assign static leases
+} server_config_t;
+
+typedef struct __attribute__((__may_alias__)) server_state_s {
+ uint8_t rqcode;
+ int listensock;
+ dhcp_msg_t rcvd_pkt;
+ uint8_t* rqopt;
+ dhcp_msg_t send_pkt;
+ static_lease *sleases;
+ struct arg_list *dleases;
+} server_state_t;
+
+struct config_keyword {
+ char *keyword;
+ int (*handler)(const char *str, void *var);
+ void *var;
+ char *def;
+};
+
+static option_val_t options_list[] = {
+ {"lease" , DHCP_NUM32 | 0x33, NULL, 0},
+ {"subnet" , DHCP_IP | 0x01, NULL, 0},
+ {"broadcast" , DHCP_IP | 0x1c, NULL, 0},
+ {"router" , DHCP_IP | 0x03, NULL, 0},
+ {"ipttl" , DHCP_NUM8 | 0x17, NULL, 0},
+ {"mtu" , DHCP_NUM16 | 0x1a, NULL, 0},
+ {"hostname" , DHCP_STRING | 0x0c, NULL, 0},
+ {"domain" , DHCP_STRING | 0x0f, NULL, 0},
+ {"search" , DHCP_STRLST | 0x77, NULL, 0},
+ {"nisdomain" , DHCP_STRING | 0x28, NULL, 0},
+ {"timezone" , DHCP_NUM32 | 0x02, NULL, 0},
+ {"tftp" , DHCP_STRING | 0x42, NULL, 0},
+ {"bootfile" , DHCP_STRING | 0x43, NULL, 0},
+ {"bootsize" , DHCP_NUM16 | 0x0d, NULL, 0},
+ {"rootpath" , DHCP_STRING | 0x11, NULL, 0},
+ {"wpad" , DHCP_STRING | 0xfc, NULL, 0},
+ {"serverid" , DHCP_IP | 0x36, NULL, 0},
+ {"message" , DHCP_STRING | 0x38, NULL, 0},
+ {"vlanid" , DHCP_NUM32 | 0x84, NULL, 0},
+ {"vlanpriority" , DHCP_NUM32 | 0x85, NULL, 0},
+ {"dns" , DHCP_IPLIST | 0x06, NULL, 0},
+ {"wins" , DHCP_IPLIST | 0x2c, NULL, 0},
+ {"nissrv" , DHCP_IPLIST | 0x29, NULL, 0},
+ {"ntpsrv" , DHCP_IPLIST | 0x2a, NULL, 0},
+ {"lprsrv" , DHCP_IPLIST | 0x09, NULL, 0},
+ {"swapsrv" , DHCP_IP | 0x10, NULL, 0},
+ {"routes" , DHCP_STCRTS | 0x21, NULL, 0},
+ {"staticroutes" , DHCP_STCRTS | 0x79, NULL, 0},
+ {"msstaticroutes" , DHCP_STCRTS | 0xf9, NULL, 0},
+};
+
+struct fd_pair { int rd; int wr; };
+static server_config_t gconfig;
+static server_state_t gstate;
+static uint8_t infomode;
+static struct fd_pair sigfd;
+static int constone = 1;
+
+// calculate options size.
+static int dhcp_opt_size(uint8_t *optionptr)
+{
+ int i = 0;
+ for(;optionptr[i] != 0xff; i++) if(optionptr[i] != 0x00) i += optionptr[i + 1] + 2 -1;
+ return i;
+}
+
+// calculates checksum for dhcp messeges.
+static uint16_t dhcp_checksum(void *addr, int count)
+{
+ int32_t sum = 0;
+ uint16_t tmp = 0, *source = (uint16_t *)addr;
+
+ while (count > 1) {
+ sum += *source++;
+ count -= 2;
+ }
+ if (count > 0) {
+ *(uint8_t*)&tmp = *(uint8_t*)source;
+ sum += tmp;
+ }
+ while (sum >> 16) sum = (sum & 0xffff) + (sum >> 16);
+ return ~sum;
+}
+
+// gets information of INTERFACE and updates IFINDEX, MAC and IP
+static int get_interface(const char *interface, int *ifindex, uint32_t *oip, uint8_t *mac)
+{
+ struct ifreq req;
+ struct sockaddr_in *ip;
+ int fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+
+ req.ifr_addr.sa_family = AF_INET;
+ strncpy(req.ifr_name, interface, IFNAMSIZ);
+ req.ifr_name[IFNAMSIZ-1] = '\0';
+
+ xioctl(fd, SIOCGIFFLAGS, &req);
+
+ if (!(req.ifr_flags & IFF_UP)) return -1;
+ if (oip) {
+ xioctl(fd, SIOCGIFADDR, &req);
+ ip = (struct sockaddr_in*) &req.ifr_addr;
+ dbg("IP %s\n", inet_ntoa(ip->sin_addr));
+ *oip = ntohl(ip->sin_addr.s_addr);
+ }
+ if (ifindex) {
+ xioctl(fd, SIOCGIFINDEX, &req);
+ dbg("Adapter index %d\n", req.ifr_ifindex);
+ *ifindex = req.ifr_ifindex;
+ }
+ if (mac) {
+ xioctl(fd, SIOCGIFHWADDR, &req);
+ memcpy(mac, req.ifr_hwaddr.sa_data, 6);
+ dbg("MAC %02x:%02x:%02x:%02x:%02x:%02x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+ }
+ close(fd);
+ return 0;
+}
+
+/*
+ *logs messeges to syslog or console
+ *opening the log is still left with applet.
+ *FIXME: move to more relevent lib. probably libc.c
+ */
+static void infomsg(uint8_t infomode, char *s, ...)
+{
+ int used;
+ char *msg;
+ va_list p, t;
+
+ if (infomode == LOG_SILENT) return;
+ va_start(p, s);
+ va_copy(t, p);
+ used = vsnprintf(NULL, 0, s, t);
+ used++;
+ va_end(t);
+
+ msg = xmalloc(used);
+ vsnprintf(msg, used, s, p);
+ va_end(p);
+
+ if (infomode & LOG_SYSTEM) syslog(LOG_INFO, "%s", msg);
+ if (infomode & LOG_CONSOLE) printf("%s\n", msg);
+ free(msg);
+}
+
+/*
+ * Writes self PID in file PATH
+ * FIXME: libc implementation only writes in /var/run
+ * this is more generic as some implemenation may provide
+ * arguments to write in specific file. as dhcpd does.
+ */
+static void write_pid(char *path)
+{
+ int pidfile = open(path, O_CREAT | O_WRONLY | O_TRUNC, 0666);
+ if (pidfile > 0) {
+ char *pidbuf = utoa(getpid());
+ write(pidfile, pidbuf, strlen(pidbuf));
+ close(pidfile);
+ }
+}
+
+// Generic signal handler real handling is done in main funcrion.
+static void signal_handler(int sig)
+{
+ unsigned char ch = sig;
+ if (write(sigfd.wr, &ch, 1) != 1) dbg("can't send signal\n");
+}
+
+// signal setup for SIGUSR1 SIGTERM
+static int setup_signal()
+{
+ if (pipe((int *)&sigfd) < 0) {
+ dbg("signal pipe failed\n");
+ return -1;
+ }
+ fcntl(sigfd.wr , F_SETFD, FD_CLOEXEC);
+ fcntl(sigfd.rd , F_SETFD, FD_CLOEXEC);
+ int flags = fcntl(sigfd.wr, F_GETFL);
+ fcntl(sigfd.wr, F_SETFL, flags | O_NONBLOCK);
+ signal(SIGUSR1, signal_handler);
+ signal(SIGTERM, signal_handler);
+ return 0;
+}
+
+// String STR to UINT32 conversion strored in VAR
+static int strtou32(const char *str, void *var)
+{
+ char *endptr = NULL;
+ int base = 10;
+ errno=0;
+ *((uint32_t*)(var)) = 0;
+ if (str[0]=='0' && (str[1]=='x' || str[1]=='X')) {
+ base = 16;
+ str+=2;
+ }
+ long ret_val = strtol(str, &endptr, base);
+ if (errno) infomsg(infomode, "config : Invalid num %s",str);
+ else if (endptr && (*endptr!='\0'||endptr == str))
+ infomsg(infomode, "config : Not a valid num %s",str);
+ else *((uint32_t*)(var)) = (uint32_t)ret_val;
+ return 0;
+}
+
+// copy string STR in variable VAR
+static int strinvar(const char *str, void *var)
+{
+ char **dest = var;
+ if (*dest) free(*dest);
+ *dest = strdup(str);
+ return 0;
+}
+
+// IP String STR to binary data.
+static int striptovar(const char *str, void *var)
+{
+ in_addr_t addr;
+ *((uint32_t*)(var)) = 0;
+ if(!str) {
+ error_msg("config : NULL address string \n");
+ return -1;
+ }
+ if((addr = inet_addr(str)) == -1) {
+ error_msg("config : wrong address %s \n",str );
+ return -1;
+ }
+ *((uint32_t*)(var)) = (uint32_t)addr;
+ return 0;
+}
+
+// String to dhcp option conversion
+static int strtoopt(const char *str, void *var)
+{
+ char *option, *valstr, *grp, *tp;
+ uint32_t optcode = 0, inf = infomode, convtmp, mask, nip, router;
+ uint16_t flag = 0;
+ int count, size = ARRAY_LEN(options_list);
+
+ if (!*str) return 0;
+ if (!(option = strtok((char*)str, " \t="))) return -1;
+
+ infomode = LOG_SILENT;
+ strtou32(option, (uint32_t*)&optcode);
+ infomode = inf;
+
+ if (optcode > 0 && optcode < 256) { // raw option
+ for (count = 0; count < size; count++) {
+ if ((options_list[count].code & 0X00FF) == optcode) {
+ flag = (options_list[count].code & 0XFF00);
+ break;
+ }
+ }
+ } else { //string option
+ for (count = 0; count < size; count++) {
+ if (!strncmp(options_list[count].key, option, strlen(options_list[count].key))) {
+ flag = (options_list[count].code & 0XFF00);
+ optcode = (options_list[count].code & 0X00FF);
+ break;
+ }
+ }
+ }
+ if (count == size) {
+ infomsg(inf, "config : Obsolete OR Unknown Option : %s", option);
+ return -1;
+ }
+
+ if (!flag || !optcode) return -1;
+
+ if (!(valstr = strtok(NULL, " \t"))) {
+ dbg("config : option %s has no value defined.\n", option);
+ return -1;
+ }
+ dbg(" value : %-20s : ", valstr);
+ switch (flag) {
+ case DHCP_NUM32:
+ options_list[count].len = sizeof(uint32_t);
+ options_list[count].val = xmalloc(sizeof(uint32_t));
+ strtou32(valstr, &convtmp);
+ memcpy(options_list[count].val, &convtmp, sizeof(uint32_t));
+ break;
+ case DHCP_NUM16:
+ options_list[count].len = sizeof(uint16_t);
+ options_list[count].val = xmalloc(sizeof(uint16_t));
+ strtou32(valstr, &convtmp);
+ memcpy(options_list[count].val, &convtmp, sizeof(uint16_t));
+ break;
+ case DHCP_NUM8:
+ options_list[count].len = sizeof(uint8_t);
+ options_list[count].val = xmalloc(sizeof(uint8_t));
+ strtou32(valstr, &convtmp);
+ memcpy(options_list[count].val, &convtmp, sizeof(uint8_t));
+ break;
+ case DHCP_IP:
+ options_list[count].len = sizeof(uint32_t);
+ options_list[count].val = xmalloc(sizeof(uint32_t));
+ striptovar(valstr, options_list[count].val);
+ break;
+ case DHCP_STRING:
+ options_list[count].len = strlen(valstr);
+ options_list[count].val = strdup(valstr);
+ break;
+ case DHCP_IPLIST:
+ while(valstr){
+ options_list[count].val = xrealloc(options_list[count].val, options_list[count].len + sizeof(uint32_t));
+ striptovar(valstr, ((uint8_t*)options_list[count].val)+options_list[count].len);
+ options_list[count].len += sizeof(uint32_t);
+ valstr = strtok(NULL," \t");
+ }
+ break;
+ case DHCP_IPPLST:
+ break;
+ case DHCP_STCRTS:
+ /* Option binary format:
+ * mask [one byte, 0..32]
+ * ip [0..4 bytes depending on mask]
+ * router [4 bytes]
+ * may be repeated
+ * staticroutes 10.0.0.0/8 10.127.0.1, 10.11.12.0/24 10.11.12.1
+ */
+ grp = strtok(valstr, ",");;
+ while(grp){
+ while(*grp == ' ' || *grp == '\t') grp++;
+ tp = strchr(grp, '/');
+ if (!tp) error_exit("wrong formated static route option");
+ *tp = '\0';
+ mask = strtol(++tp, &tp, 10);
+ if (striptovar(grp, (uint8_t*)&nip)<0) error_exit("wrong formated static route option");
+ while(*tp == ' ' || *tp == '\t' || *tp == '-') tp++;
+ if (striptovar(tp, (uint8_t*)&router)<0) error_exit("wrong formated static route option");
+ options_list[count].val = xrealloc(options_list[count].val, options_list[count].len + 1 + mask/8 + 4);
+ memcpy(((uint8_t*)options_list[count].val)+options_list[count].len, &mask, 1);
+ options_list[count].len += 1;
+ memcpy(((uint8_t*)options_list[count].val)+options_list[count].len, &nip, mask/8);
+ options_list[count].len += mask/8;
+ memcpy(((uint8_t*)options_list[count].val)+options_list[count].len, &router, 4);
+ options_list[count].len += 4;
+ tp = NULL;
+ grp = strtok(NULL, ",");
+ }
+ break;
+ }
+ return 0;
+}
+
+// Reads Static leases from STR and updates inner structures.
+static int get_staticlease(const char *str, void *var)
+{
+ struct static_lease_s *sltmp;
+ char *tkmac, *tkip;
+ int count;
+
+ if (!*str) return 0;
+
+ if (!(tkmac = strtok((char*)str, " \t"))) {
+ infomsg(infomode, "config : static lease : mac not found");
+ return 0;
+ }
+ if (!(tkip = strtok(NULL, " \t"))) {
+ infomsg(infomode, "config : static lease : no ip bind to mac %s", tkmac);
+ return 0;
+ }
+ sltmp = xzalloc(sizeof(struct static_lease_s));
+ for (count = 0; count < 6; count++, tkmac++) {
+ errno = 0;
+ sltmp->mac[count] = strtol(tkmac, &tkmac, 16);
+ if (sltmp->mac[count]>255 || sltmp->mac[count]<0 || (*tkmac && *tkmac!=':') || errno) {
+ infomsg(infomode, "config : static lease : mac address wrong format");
+ free(sltmp);
+ return 0;
+ }
+ }
+ striptovar(tkip, &sltmp->nip);
+ sltmp->next = gstate.sleases;
+ gstate.sleases = sltmp;
+
+ return 0;
+}
+
+static struct config_keyword keywords[] = {
+// keyword handler variable address default
+ {"start" , striptovar , (void*)&gconfig.start_ip , "192.168.0.20"},
+ {"end" , striptovar , (void*)&gconfig.end_ip , "192.168.0.254"},
+ {"interface" , strinvar , (void*)&gconfig.interface , "eth0"},
+ {"port" , strtou32 , (void*)&gconfig.port , "67"},
+ {"min_lease" , strtou32 , (void*)&gconfig.min_lease_sec, "60"},
+ {"max_leases" , strtou32 , (void*)&gconfig.max_leases , "235"},
+ {"auto_time" , strtou32 , (void*)&gconfig.auto_time , "7200"},
+ {"decline_time" , strtou32 , (void*)&gconfig.decline_time , "3600"},
+ {"conflict_time", strtou32 , (void*)&gconfig.conflict_time, "3600"},
+ {"offer_time" , strtou32 , (void*)&gconfig.offer_time , "60"},
+ {"lease_file" , strinvar , (void*)&gconfig.lease_file , "/var/lib/misc/dhcpd.leases"}, //LEASES_FILE
+ {"pidfile" , strinvar , (void*)&gconfig.pidfile , "/var/run/dhcpd.pid"}, //DPID_FILE
+ {"siaddr" , striptovar , (void*)&gconfig.siaddr_nip , "0.0.0.0"},
+ {"option" , strtoopt , (void*)&gconfig.options , ""},
+ {"opt" , strtoopt , (void*)&gconfig.options , ""},
+ {"notify_file" , strinvar , (void*)&gconfig.notify_file , ""},
+ {"sname" , strinvar , (void*)&gconfig.sname , ""},
+ {"boot_file" , strinvar , (void*)&gconfig.boot_file , ""},
+ {"static_lease" , get_staticlease , (void*)&gconfig.static_leases, ""},
+};
+
+// Parses the server config file and updates the global server config accordingly.
+static int parse_server_config(char *config_file, struct config_keyword *confkey)
+{
+ FILE *fs = NULL;
+ char *confline_temp = NULL,*confline = NULL, *tk = NULL, *tokens[2] = {NULL, NULL};
+ int len, linelen, tcount, count, size = ARRAY_LEN(keywords);
+
+ for (count = 0; count < size; count++)
+ if (confkey[count].handler) confkey[count].handler(confkey[count].def, confkey[count].var);
+
+ if (!(fs = fopen(config_file, "r"))) perror_msg("%s", config_file);
+ for (len = 0, linelen = 0; fs;) {
+ len = getline(&confline_temp, (size_t*) &linelen, fs);
+ confline = confline_temp;
+ if (len <= 0) break;
+ for (; *confline == ' '; confline++, len--);
+ if ((confline[0] == '#') || (confline[0] == '\n')) goto free_conf_continue;
+ tk = strchr(confline, '#');
+ if (tk) {
+ for (; *(tk-1)==' ' || *(tk-1)=='\t'; tk--);
+ *tk = '\0';
+ }
+ tk = strchr(confline, '\n');
+ if (tk) {
+ for (; *(tk-1)==' ' || *(tk-1)=='\t'; tk--);
+ *tk = '\0';
+ }
+ for (tcount=0, tk=strtok(confline, " \t"); tk && (tcount < 2);
+ tcount++, tk=strtok(NULL,(tcount==1)?"":" \t")) {
+ while ((*tk == '\t') || (*tk == ' ')) tk++;
+ tokens[tcount] = xstrdup(tk);
+ }
+ if (tcount<=1) goto free_tk0_continue;
+ for (count = 0; count < size; count++) {
+ if (!strcmp(confkey[count].keyword,tokens[0])) {
+ dbg("got config : %15s : ", confkey[count].keyword);
+ if (confkey[count].handler(tokens[1], confkey[count].var) == 0)
+ dbg("%s \n", tokens[1]);
+ break;
+ }
+ }
+ if (tokens[1]) { free(tokens[1]); tokens[1] = NULL; }
+free_tk0_continue:
+ if (tokens[0]) { free(tokens[0]); tokens[0] = NULL; }
+free_conf_continue:
+ free(confline_temp);
+ confline_temp = NULL;
+ }
+ if (fs) fclose(fs);
+ return 0;
+}
+
+// opens UDP socket for listen
+static int open_listensock(void)
+{
+ struct sockaddr_in addr;
+ struct ifreq ifr;
+
+ if (gstate.listensock > 0) close(gstate.listensock);
+
+ dbg("Opening listen socket on *:%d %s\n", gconfig.port, gconfig.interface);
+ gstate.listensock = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ setsockopt(gstate.listensock, SOL_SOCKET, SO_REUSEADDR, &constone, sizeof(constone));
+ if (setsockopt(gstate.listensock, SOL_SOCKET, SO_BROADCAST, &constone, sizeof(constone)) == -1) {
+ dbg("OPEN : brodcast ioctl failed.\n");
+ close(gstate.listensock);
+ return -1;
+ }
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, gconfig.interface, IFNAMSIZ);
+ ifr.ifr_name[IFNAMSIZ -1] = '\0';
+ setsockopt(gstate.listensock, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = (flag_chk(FLAG_P))?htons(TT.port):htons(67); //SERVER_PORT
+ addr.sin_addr.s_addr = INADDR_ANY ;
+
+ if (bind(gstate.listensock, (struct sockaddr *) &addr, sizeof(addr))) {
+ close(gstate.listensock);
+ perror_exit("bind failed");
+ }
+ dbg("OPEN : success\n");
+ return 0;
+}
+
+// Sends data through raw socket.
+static int send_packet(uint8_t broadcast)
+{
+ struct sockaddr_ll dest_sll;
+ dhcp_raw_t packet;
+ unsigned padding;
+ int fd, result = -1;
+ uint8_t bmacaddr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+
+ memset(&packet, 0, sizeof(dhcp_raw_t));
+ memcpy(&packet.dhcp, &gstate.send_pkt, sizeof(dhcp_msg_t));
+
+ if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
+ dbg("SEND : socket failed\n");
+ return -1;
+ }
+ memset(&dest_sll, 0, sizeof(dest_sll));
+ dest_sll.sll_family = AF_PACKET;
+ dest_sll.sll_protocol = htons(ETH_P_IP);
+ dest_sll.sll_ifindex = gconfig.ifindex;
+ dest_sll.sll_halen = 6;
+ memcpy(dest_sll.sll_addr, (broadcast)?bmacaddr:gstate.rcvd_pkt.chaddr , 6);
+
+ if (bind(fd, (struct sockaddr *) &dest_sll, sizeof(dest_sll)) < 0) {
+ dbg("SEND : bind failed\n");
+ close(fd);
+ return -1;
+ }
+ padding = 308 - 1 - dhcp_opt_size(gstate.send_pkt.options);
+ packet.iph.protocol = IPPROTO_UDP;
+ packet.iph.saddr = gconfig.server_nip;
+ packet.iph.daddr = (broadcast || (gstate.rcvd_pkt.ciaddr == 0))?INADDR_BROADCAST:gstate.rcvd_pkt.ciaddr;
+ packet.udph.source = htons(67);//SERVER_PORT
+ packet.udph.dest = htons(68); //CLIENT_PORT
+ packet.udph.len = htons(sizeof(dhcp_raw_t) - sizeof(struct iphdr) - padding);
+ packet.iph.tot_len = packet.udph.len;
+ packet.udph.check = dhcp_checksum(&packet, sizeof(dhcp_raw_t) - padding);
+ packet.iph.tot_len = htons(sizeof(dhcp_raw_t) - padding);
+ packet.iph.ihl = sizeof(packet.iph) >> 2;
+ packet.iph.version = IPVERSION;
+ packet.iph.ttl = IPDEFTTL;
+ packet.iph.check = dhcp_checksum(&packet.iph, sizeof(packet.iph));
+
+ result = sendto(fd, &packet, sizeof(dhcp_raw_t) - padding, 0,
+ (struct sockaddr *) &dest_sll, sizeof(dest_sll));
+
+ dbg("sendto %d\n", result);
+ close(fd);
+ if (result < 0) dbg("PACKET send error\n");
+ return result;
+}
+
+// Reads from UDP socket
+static int read_packet(void)
+{
+ int ret;
+
+ memset(&gstate.rcvd_pkt, 0, sizeof(dhcp_msg_t));
+ ret = read(gstate.listensock, &gstate.rcvd_pkt, sizeof(dhcp_msg_t));
+ if (ret < 0) {
+ dbg("Packet read error, ignoring. \n");
+ return ret; // returns -1
+ }
+ if (gstate.rcvd_pkt.cookie != htonl(DHCP_MAGIC)) {
+ dbg("Packet with bad magic, ignoring. \n");
+ return -2;
+ }
+ if (gstate.rcvd_pkt.op != 1) { //BOOTPREQUEST
+ dbg("Not a BOOT REQUEST ignoring. \n");
+ return -2;
+ }
+ if (gstate.rcvd_pkt.hlen != 6) {
+ dbg("hlen != 6 ignoring. \n");
+ return -2;
+ }
+ dbg("Received a packet. Size : %d \n", ret);
+ return ret;
+}
+
+// Preapres a dhcp packet with defaults and configs
+static uint8_t* prepare_send_pkt(void)
+{
+ memset((void*)&gstate.send_pkt, 0, sizeof(gstate.send_pkt));
+ gstate.send_pkt.op = 2; //BOOTPREPLY
+ gstate.send_pkt.htype = 1;
+ gstate.send_pkt.hlen = 6;
+ gstate.send_pkt.xid = gstate.rcvd_pkt.xid;
+ gstate.send_pkt.cookie = htonl(DHCP_MAGIC);
+ gstate.send_pkt.nsiaddr = gconfig.server_nip;
+ memcpy(gstate.send_pkt.chaddr, gstate.rcvd_pkt.chaddr, 16);
+ gstate.send_pkt.options[0] = DHCP_OPT_END;
+ return gstate.send_pkt.options;
+}
+
+// Sets a option value in dhcp packet's option field
+static uint8_t* set_optval(uint8_t *optptr, uint16_t opt, void *var, size_t len)
+{
+ while (*optptr != DHCP_OPT_END) optptr++;
+ *optptr++ = (uint8_t)(opt & 0x00FF);
+ *optptr++ = (uint8_t) len;
+ memcpy(optptr, var, len);
+ optptr += len;
+ *optptr = DHCP_OPT_END;
+ return optptr;
+}
+
+// Gets a option value from dhcp packet's option field
+static uint8_t* get_optval(uint8_t *optptr, uint16_t opt, void *var)
+{
+ size_t len;
+ uint8_t overloaded = 0;
+
+ while (1) {
+ while (*optptr == DHCP_OPT_PADDING) optptr++;
+ if ((*optptr & 0x00FF) == DHCP_OPT_END) break;
+ if ((*optptr & 0x00FF) == DHCP_OPT_OPTION_OVERLOAD) {
+ overloaded = optptr[2];
+ optptr += optptr[1] + 2;
+ }
+ len = optptr[1];
+ if (*optptr == (opt & 0x00FF))
+ switch (opt & 0xFF00) {
+ case DHCP_NUM32: // FALLTHROUGH
+ case DHCP_IP:
+ memcpy(var, optptr+2, sizeof(uint32_t));
+ optptr += len + 2;
+ return optptr;
+ break;
+ case DHCP_NUM16:
+ memcpy(var, optptr+2, sizeof(uint16_t));
+ optptr += len + 2;
+ return optptr;
+ break;
+ case DHCP_NUM8:
+ memcpy(var, optptr+2, sizeof(uint8_t));
+ optptr += len + 2;
+ return optptr;
+ break;
+ case DHCP_STRING:
+ var = xstrndup((char*) optptr, len);
+ optptr += len + 2;
+ return optptr;
+ break;
+ }
+ optptr += len + 2;
+ }
+ if ((overloaded == 1) | (overloaded == 3)) get_optval((uint8_t*)&gstate.rcvd_pkt.file, opt, var);
+ if ((overloaded == 2) | (overloaded == 3)) get_optval((uint8_t*)&gstate.rcvd_pkt.sname, opt, var);
+ return optptr;
+}
+
+// Retrives Requested Parameter list from dhcp req packet.
+static uint8_t get_reqparam(uint8_t **list)
+{
+ uint8_t len, *optptr;
+ if(*list) free(*list);
+ for (optptr = gstate.rcvd_pkt.options;
+ *optptr && *optptr!=((DHCP_OPT_PARAM_REQ) & 0x00FF); optptr+=optptr[1]+2);
+ len = *++optptr;
+ *list = xzalloc(len+1);
+ memcpy(*list, ++optptr, len);
+ return len;
+}
+
+// Sets values of req param in dhcp offer packet.
+static uint8_t* set_reqparam(uint8_t *optptr, uint8_t *list)
+{
+ uint8_t reqcode;
+ int count, size = ARRAY_LEN(options_list);
+
+ while (*list) {
+ reqcode = *list++;
+ for (count = 0; count < size; count++) {
+ if ((options_list[count].code & 0X00FF)==reqcode) {
+ if (!(options_list[count].len) || !(options_list[count].val)) break;
+ for (; *optptr && *optptr!=DHCP_OPT_END; optptr+=optptr[1]+2);
+ *optptr++ = (uint8_t) (options_list[count].code & 0x00FF);
+ *optptr++ = (uint8_t) options_list[count].len;
+ memcpy(optptr, options_list[count].val, options_list[count].len);
+ optptr += options_list[count].len;
+ *optptr = DHCP_OPT_END;
+ break;
+ }
+ }
+ }
+ return optptr;
+}
+
+static void run_notify(char **argv)
+{
+ struct stat sts;
+ volatile int error = 0;
+ pid_t pid;
+
+ if (stat(argv[0], &sts) == -1 && errno == ENOENT) {
+ infomsg(infomode, "notify file: %s : not exist.", argv[0]);
+ return;
+ }
+ fflush(NULL);
+
+ pid = vfork();
+ if (pid < 0) {
+ dbg("Fork failed.\n");
+ return;
+ }
+ if (!pid) {
+ execvp(argv[0], argv);
+ error = errno;
+ _exit(111);
+ }
+ if (error) {
+ waitpid(pid, NULL, 0);
+ errno = error;
+ }
+ dbg("script complete.\n");
+}
+
+static int write_leasefile(void)
+{
+ int fd;
+ uint32_t curr, tmp_time;
+ int64_t timestamp;
+ struct arg_list *listdls = gstate.dleases;
+ dyn_lease *dls;
+
+ if ((fd = open(gconfig.lease_file, O_WRONLY | O_CREAT | O_TRUNC)) < 0) {
+ perror_msg("can't open %s ", gconfig.lease_file);
+ return fd;
+ }
+
+ curr = timestamp = time(NULL);
+ timestamp = SWAP_BE64(timestamp);
+ writeall(fd, &timestamp, sizeof(timestamp));
+
+ while (listdls) {
+ dls = (dyn_lease*)listdls->arg;
+ tmp_time = dls->expires;
+ dls->expires -= curr;
+ if ((int32_t) dls->expires < 0) goto skip;
+ dls->expires = htonl(dls->expires);
+ writeall(fd, dls, sizeof(dyn_lease));
+skip:
+ dls->expires = tmp_time;
+ listdls = listdls->next;
+ }
+ close(fd);
+ if (gconfig.notify_file) {
+ char *argv[3];
+ argv[0] = gconfig.notify_file;
+ argv[1] = gconfig.lease_file;
+ argv[2] = NULL;
+ run_notify(argv);
+ }
+ return 0;
+}
+
+// Update max lease time from options.
+static void set_maxlease(void)
+{
+ int count, size = ARRAY_LEN(options_list);
+ for (count = 0; count < size; count++)
+ if (options_list[count].val && options_list[count].code == (DHCP_OPT_LEASE_TIME)) {
+ gconfig.max_lease_sec = *((uint32_t*)options_list[count].val);
+ break;
+ }
+ if (!gconfig.max_lease_sec) gconfig.max_lease_sec = (60*60*24*10);// DEFAULT_LEASE_TIME;
+}
+
+// Returns lease time for client.
+static uint32_t get_lease(uint32_t req_exp)
+{
+ uint32_t now = time(NULL);
+ req_exp = req_exp - now;
+ if ((req_exp <= 0) || (req_exp > gconfig.max_lease_sec))
+ return gconfig.max_lease_sec;
+
+ if (req_exp < gconfig.min_lease_sec)
+ return gconfig.min_lease_sec;
+
+ return req_exp;
+}
+
+// Verify ip NIP in current leases ( assigned or not)
+static int verifyip_in_lease(uint32_t nip, uint8_t mac[6])
+{
+ static_lease *sls;
+ struct arg_list *listdls;
+
+ for (listdls = gstate.dleases; listdls; listdls = listdls->next) {
+ if (((dyn_lease*) listdls->arg)->lease_nip == nip) {
+ if (((int32_t)(((dyn_lease*) listdls->arg)->expires) - time(NULL)) < 0)
+ return 0;
+ return -1;
+ }
+ if (!memcmp(((dyn_lease*) listdls->arg)->lease_mac, mac, 6)) return -1;
+ }
+ for (sls = gstate.sleases; sls; sls = sls->next)
+ if (sls->nip == nip) return -2;
+
+ if ((ntohl(nip) < gconfig.start_ip) || (ntohl(nip) > gconfig.end_ip))
+ return -3;
+
+ return 0;
+}
+
+// add ip assigned_nip to dynamic lease.
+static int addip_to_lease(uint32_t assigned_nip, uint8_t mac[6], uint32_t *req_exp, char *hostname, uint8_t update)
+{
+ dyn_lease *dls;
+ struct arg_list *listdls = gstate.dleases;
+ uint32_t now = time(NULL);
+
+ while (listdls) {
+ if (!memcmp(((dyn_lease*) listdls->arg)->lease_mac, mac, 6)) {
+ if (update) *req_exp = get_lease(*req_exp + ((dyn_lease*) listdls->arg)->expires);
+ ((dyn_lease*) listdls->arg)->expires = *req_exp + now;
+ return 0;
+ }
+ listdls = listdls->next;
+ }
+
+ dls = xzalloc(sizeof(dyn_lease));
+ memcpy(dls->lease_mac, mac, 6);
+ dls->lease_nip = assigned_nip;
+ if (hostname) memcpy(dls->hostname, hostname, 20);
+
+ if (update) *req_exp = get_lease(*req_exp + now);
+ dls->expires = *req_exp + now;
+
+ listdls = xzalloc(sizeof(struct arg_list));
+ listdls->next = gstate.dleases;
+ listdls->arg = (char*)dls;
+ gstate.dleases = listdls;
+
+ return 0;
+}
+
+// delete ip assigned_nip from dynamic lease.
+static int delip_from_lease(uint32_t assigned_nip, uint8_t mac[6], uint32_t del_time)
+{
+ struct arg_list *listdls = gstate.dleases;
+
+ while (listdls) {
+ if (!memcmp(((dyn_lease*) listdls->arg)->lease_mac, mac, 6)) {
+ ((dyn_lease*) listdls->arg)->expires = del_time + time(NULL);
+ return 0;
+ }
+ listdls = listdls->next;
+ }
+ return -1;
+}
+
+// returns a IP from static, dynamic leases or free ip pool, 0 otherwise.
+static uint32_t getip_from_pool(uint32_t req_nip, uint8_t mac[6], uint32_t *req_exp, char *hostname)
+{
+ uint32_t nip = 0;
+ static_lease *sls = gstate.sleases;
+ struct arg_list *listdls = gstate.dleases, *tmp = NULL;
+
+ if (req_nip && (!verifyip_in_lease(req_nip, mac))) nip = req_nip;
+
+ if (!nip) {
+ while (listdls) {
+ if (!memcmp(((dyn_lease*)listdls->arg)->lease_mac, mac, 6)) {
+ nip = ((dyn_lease*)listdls->arg)->lease_nip;
+ if (tmp) tmp->next = listdls->next;
+ else gstate.dleases = listdls->next;
+ free(listdls->arg);
+ free(listdls);
+ if (verifyip_in_lease(nip, mac) < 0) nip = 0;
+ break;
+ }
+ tmp = listdls;
+ listdls = listdls->next;
+ }
+ }
+ if (!nip) {
+ while (sls) {
+ if (memcmp(sls->mac, mac, 6) == 0) {
+ nip = sls->nip;
+ break;
+ }
+ sls = sls->next;
+ }
+ }
+ if (!nip) {
+ for (nip = htonl(gconfig.start_ip); ntohl(nip) <= gconfig.end_ip; ) {
+ if (!verifyip_in_lease(nip, mac)) break;
+ nip = ntohl(nip);
+ nip = htonl(++nip);
+ }
+ if (ntohl(nip) > gconfig.end_ip) {
+ nip = 0;
+ infomsg(infomode, "can't find free IP in IP Pool.");
+ }
+ }
+ if (nip) addip_to_lease(nip, mac, req_exp, hostname, 1);
+ return nip;
+}
+
+static int read_leasefile(void)
+{
+ uint32_t passed, ip;
+ int32_t tmp_time;
+ int64_t timestamp;
+ dyn_lease *dls;
+ int ret = -1, fd = open(gconfig.lease_file, O_RDONLY);
+
+ if (fd < 0) return fd;
+ dls = xzalloc(sizeof(dyn_lease));
+
+ if (read(fd, &timestamp, sizeof(timestamp)) != sizeof(timestamp)) goto error_exit;
+
+ timestamp = SWAP_BE64(timestamp);
+ passed = time(NULL) - timestamp;
+ if ((uint64_t)passed > 12 * 60 * 60) goto error_exit;
+
+ while (read(fd, dls, sizeof(dyn_lease)) == sizeof(dyn_lease)) {
+ ip = ntohl(dls->lease_nip);
+ if (ip >= gconfig.start_ip && ip <= gconfig.end_ip) {
+ tmp_time = ntohl(dls->expires) - passed;
+ if (tmp_time < 0) continue;
+ addip_to_lease(dls->lease_nip, dls->lease_mac, (uint32_t*)&tmp_time, dls->hostname, 0);
+ }
+ }
+ ret = 0;
+error_exit:
+ free(dls);
+ close(fd);
+ return ret;
+}
+
+void dhcpd_main(void)
+{
+ struct timeval tv;
+ int retval;
+ uint8_t *optptr, msgtype = 0;
+ uint32_t waited = 0, serverid = 0, requested_nip = 0;
+ uint32_t reqested_lease = 0, ip_pool_size = 0;
+ char *hstname = NULL;
+ fd_set rfds;
+
+ infomode = LOG_CONSOLE;
+ if (!(flag_chk(FLAG_f))) {
+ daemonize();
+ infomode = LOG_SILENT;
+ }
+ if (flag_chk(FLAG_S)) {
+ openlog("UDHCPD :", LOG_PID, LOG_DAEMON);
+ infomode |= LOG_SYSTEM;
+ }
+ setlinebuf(stdout);
+ parse_server_config((toys.optc==1)?toys.optargs[0]:"/etc/dhcpd.conf", keywords); //DHCPD_CONF_FILE
+ infomsg(infomode, "toybox dhcpd started");
+ gconfig.start_ip = ntohl(gconfig.start_ip);
+ gconfig.end_ip = ntohl(gconfig.end_ip);
+ ip_pool_size = gconfig.end_ip - gconfig.start_ip + 1;
+ if (gconfig.max_leases > ip_pool_size) {
+ error_msg("max_leases=%u is too big, setting to %u", (unsigned) gconfig.max_leases, ip_pool_size);
+ gconfig.max_leases = ip_pool_size;
+ }
+ write_pid(gconfig.pidfile);
+ set_maxlease();
+ read_leasefile();
+
+ if (get_interface(gconfig.interface, &gconfig.ifindex, &gconfig.server_nip,
+ gconfig.server_mac)<0)
+ perror_exit("Failed to get interface %s", gconfig.interface);
+ gconfig.server_nip = htonl(gconfig.server_nip);
+
+ setup_signal();
+ open_listensock();
+ fcntl(gstate.listensock, F_SETFD, FD_CLOEXEC);
+
+ for (;;) {
+ uint32_t timestmp = time(NULL);
+ FD_ZERO(&rfds);
+ FD_SET(gstate.listensock, &rfds);
+ FD_SET(sigfd.rd, &rfds);
+ tv.tv_sec = gconfig.auto_time - waited;
+ tv.tv_usec = 0;
+ retval = 0;
+ serverid = 0;
+ msgtype = 0;
+
+ int maxfd = (sigfd.rd > gstate.listensock)? sigfd.rd : gstate.listensock;
+ dbg("select waiting ....\n");
+ retval = select(maxfd + 1, &rfds, NULL, NULL, (gconfig.auto_time?&tv:NULL));
+ if (retval < 0) {
+ if (errno == EINTR) {
+ waited += (unsigned) time(NULL) - timestmp;
+ continue;
+ }
+ dbg("Error in select wait again...\n");
+ continue;
+ }
+ if (!retval) { // Timed out
+ dbg("select wait Timed Out...\n");
+ waited = 0;
+ write_leasefile();
+ if (get_interface(gconfig.interface, &gconfig.ifindex, &gconfig.server_nip, gconfig.server_mac)<0)
+ perror_exit("Interface lost %s\n", gconfig.interface);
+ gconfig.server_nip = htonl(gconfig.server_nip);
+ continue;
+ }
+ if (FD_ISSET(sigfd.rd, &rfds)) { // Some Activity on RDFDs : is signal
+ unsigned char sig;
+ if (read(sigfd.rd, &sig, 1) != 1) {
+ dbg("signal read failed.\n");
+ continue;
+ }
+ switch (sig) {
+ case SIGUSR1:
+ infomsg(infomode, "Received SIGUSR1");
+ write_leasefile();
+ continue;
+ case SIGTERM:
+ infomsg(infomode, "Received SIGTERM");
+ write_leasefile();
+ unlink(gconfig.pidfile);
+ exit(0);
+ break;
+ default: break;
+ }
+ }
+ if (FD_ISSET(gstate.listensock, &rfds)) { // Some Activity on RDFDs : is socket
+ dbg("select listen sock read\n");
+ if (read_packet() < 0) {
+ open_listensock();
+ continue;
+ }
+ waited += time(NULL) - timestmp;
+ get_optval((uint8_t*)&gstate.rcvd_pkt.options, DHCP_OPT_MESSAGE_TYPE, &gstate.rqcode);
+ if (gstate.rqcode == 0 || gstate.rqcode < DHCPDISCOVER
+ || gstate.rqcode > DHCPINFORM) {
+ dbg("no or bad message type option, ignoring packet.\n");
+ continue;
+ }
+ get_optval((uint8_t*) &gstate.rcvd_pkt.options, DHCP_OPT_SERVER_ID, &serverid);
+ if (serverid && (serverid != gconfig.server_nip)) {
+ dbg("server ID doesn't match, ignoring packet.\n");
+ continue;
+ }
+ switch (gstate.rqcode) {
+ case DHCPDISCOVER:
+ msgtype = DHCPOFFER;
+ dbg("Message Type : DHCPDISCOVER\n");
+ get_optval((uint8_t*) &gstate.rcvd_pkt.options, DHCP_OPT_REQUESTED_IP, &requested_nip);
+ get_optval((uint8_t*) &gstate.rcvd_pkt.options, DHCP_OPT_HOST_NAME, &hstname);
+ reqested_lease = gconfig.offer_time;
+ get_reqparam(&gstate.rqopt);
+ optptr = prepare_send_pkt();
+ gstate.send_pkt.yiaddr = getip_from_pool(requested_nip, gstate.rcvd_pkt.chaddr, &reqested_lease, hstname);
+ if(!gstate.send_pkt.yiaddr){
+ msgtype = DHCPNAK;
+ optptr = set_optval(optptr, DHCP_OPT_MESSAGE_TYPE, &msgtype, 1);
+ send_packet(1);
+ break;
+ }
+ get_optval((uint8_t*) &gstate.rcvd_pkt.options, DHCP_OPT_LEASE_TIME, &reqested_lease);
+ reqested_lease = htonl(get_lease(reqested_lease + time(NULL)));
+ optptr = set_optval(optptr, DHCP_OPT_MESSAGE_TYPE, &msgtype, 1);
+ optptr = set_optval(optptr, DHCP_OPT_SERVER_ID, &gconfig.server_nip, 4);
+ optptr = set_optval(optptr, DHCP_OPT_LEASE_TIME, &reqested_lease, 4);
+ optptr = set_reqparam(optptr, gstate.rqopt);
+ send_packet(1);
+ break;
+ case DHCPREQUEST:
+ msgtype = DHCPACK;
+ dbg("Message Type : DHCPREQUEST\n");
+ optptr = prepare_send_pkt();
+ get_optval((uint8_t*) &gstate.rcvd_pkt.options, DHCP_OPT_REQUESTED_IP, &requested_nip);
+ get_optval((uint8_t*) &gstate.rcvd_pkt.options, DHCP_OPT_LEASE_TIME, &reqested_lease);
+ get_optval((uint8_t*) &gstate.rcvd_pkt.options, DHCP_OPT_HOST_NAME, &hstname);
+ gstate.send_pkt.yiaddr = getip_from_pool(requested_nip, gstate.rcvd_pkt.chaddr, &reqested_lease, hstname);
+ if (!serverid) reqested_lease = gconfig.max_lease_sec;
+ if (!gstate.send_pkt.yiaddr) {
+ msgtype = DHCPNAK;
+ optptr = set_optval(optptr, DHCP_OPT_MESSAGE_TYPE, &msgtype, 1);
+ send_packet(1);
+ break;
+ }
+ optptr = set_optval(optptr, DHCP_OPT_MESSAGE_TYPE, &msgtype, 1);
+ optptr = set_optval(optptr, DHCP_OPT_SERVER_ID, &gconfig.server_nip, 4);
+ reqested_lease = htonl(reqested_lease);
+ optptr = set_optval(optptr, DHCP_OPT_LEASE_TIME, &reqested_lease, 4);
+ send_packet(1);
+ write_leasefile();
+ break;
+ case DHCPDECLINE:// FALL THROUGH
+ case DHCPRELEASE:
+ dbg("Message Type : DHCPDECLINE or DHCPRELEASE \n");
+ get_optval((uint8_t*) &gstate.rcvd_pkt.options, DHCP_OPT_SERVER_ID, &serverid);
+ if (serverid != gconfig.server_nip) break;
+ get_optval((uint8_t*) &gstate.rcvd_pkt.options, DHCP_OPT_REQUESTED_IP, &requested_nip);
+ delip_from_lease(requested_nip, gstate.rcvd_pkt.chaddr, (gstate.rqcode==DHCPRELEASE)?0:gconfig.decline_time);
+ break;
+ default:
+ dbg("Message Type : %u\n", gstate.rqcode);
+ break;
+ }
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-10-31 06:30:31 +0000