diff options
Diffstat (limited to 'toys/pending/dhcp.c')
| -rw-r--r-- | toys/pending/dhcp.c | 1536 |
1 files changed, 1536 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); + } +} |