diff options
Diffstat (limited to 'networking/udhcp')
| -rw-r--r-- | networking/udhcp/Config.in | 10 | ||||
| -rw-r--r-- | networking/udhcp/dhcpc.c | 3 | ||||
| -rw-r--r-- | networking/udhcp/dhcpc.h | 6 | ||||
| -rw-r--r-- | networking/udhcp/dhcpd.c | 21 | ||||
| -rw-r--r-- | networking/udhcp/dhcpd.h | 18 | ||||
| -rw-r--r-- | networking/udhcp/files.c | 161 | ||||
| -rw-r--r-- | networking/udhcp/leases.c | 4 | ||||
| -rw-r--r-- | networking/udhcp/serverpacket.c | 31 | ||||
| -rw-r--r-- | networking/udhcp/socket.c | 7 |
9 files changed, 148 insertions, 113 deletions
diff --git a/networking/udhcp/Config.in b/networking/udhcp/Config.in index 9dd02c497..7a3eda9cc 100644 --- a/networking/udhcp/Config.in +++ b/networking/udhcp/Config.in @@ -32,6 +32,16 @@ config APP_DUMPLEASES See http://udhcp.busybox.net for further details. +config FEATURE_UDHCPD_WRITE_LEASES_EARLY + bool "Rewrite the lease file at every new acknowledge" + default n + depends on APP_UDHCPD + help + If selected, udhcpd will write a new file with leases every + time a new lease has been accepted, thus eleminating the need + to send SIGUSR1 for the initial writing, or updating. Any timed + rewriting remains undisturbed + config APP_UDHCPC bool "udhcp Client (udhcpc)" default n diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c index 06806ec66..50ac31e61 100644 --- a/networking/udhcp/dhcpc.c +++ b/networking/udhcp/dhcpc.c @@ -114,8 +114,7 @@ static void client_background(void) * If that will be properly disabled for NOMMU, client_background() * will work on NOMMU too */ #else -// chdir(/) is problematic. Imagine that e.g. pidfile name is RELATIVE! what will unlink do then, eh? - bb_daemonize(DAEMON_CHDIR_ROOT); + bb_daemonize(0); /* rewrite pidfile, as our pid is different now */ if (client_config.pidfile) write_pidfile(client_config.pidfile); diff --git a/networking/udhcp/dhcpc.h b/networking/udhcp/dhcpc.h index fa091bf72..09b014239 100644 --- a/networking/udhcp/dhcpc.h +++ b/networking/udhcp/dhcpc.h @@ -17,12 +17,12 @@ struct client_config_t { /* (can be set directly to the result of getopt32) */ char foreground; /* Do not fork */ char quit_after_lease; /* Quit after obtaining lease */ - char release_on_quit; /* perform release on quit */ + char release_on_quit; /* Perform release on quit */ char abort_if_no_lease; /* Abort if no lease */ char background_if_no_lease; /* Fork to background if no lease */ - const char *interface; /* The name of the interface to use */ + const char *interface; /* The name of the interface to use */ char *pidfile; /* Optionally store the process ID */ - const char *script; /* User script to run at dhcp events */ + const char *script; /* User script to run at dhcp events */ uint8_t *clientid; /* Optional client id to use */ uint8_t *vendorclass; /* Optional vendor class-id to use */ uint8_t *hostname; /* Optional hostname to use */ diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c index 778121b61..6be3c0e2e 100644 --- a/networking/udhcp/dhcpd.c +++ b/networking/udhcp/dhcpd.c @@ -37,7 +37,7 @@ int udhcpd_main(int argc, char **argv) //Huh, dhcpd don't have --foreground, --syslog options?? TODO if (!ENABLE_FEATURE_UDHCP_DEBUG) { - bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv); + bb_daemonize_or_rexec(0, argv); logmode &= ~LOGMODE_STDIO; } @@ -60,15 +60,15 @@ int udhcpd_main(int argc, char **argv) } /* Sanity check */ - num_ips = ntohl(server_config.end) - ntohl(server_config.start) + 1; + num_ips = server_config.end_ip - server_config.start_ip + 1; if (server_config.max_leases > num_ips) { - bb_error_msg("max_leases value (%lu) not sane, " - "setting to %lu instead", + bb_error_msg("max_leases=%lu is too big, " + "setting to %lu", server_config.max_leases, num_ips); server_config.max_leases = num_ips; } - leases = xzalloc(server_config.max_leases * sizeof(struct dhcpOfferedAddr)); + leases = xzalloc(server_config.max_leases * sizeof(*leases)); read_leases(server_config.lease_file); if (read_interface(server_config.interface, &server_config.ifindex, @@ -207,10 +207,13 @@ int udhcpd_main(int argc, char **argv) /* make some contention for this address */ } else sendNAK(&packet); - } else if (requested_align < server_config.start - || requested_align > server_config.end - ) { - sendNAK(&packet); + } else { + uint32_t r = ntohl(requested_align); + if (r < server_config.start_ip + || r > server_config.end_ip + ) { + sendNAK(&packet); + } } /* else remain silent */ } else { diff --git a/networking/udhcp/dhcpd.h b/networking/udhcp/dhcpd.h index 7c4fe695a..05e3cf004 100644 --- a/networking/udhcp/dhcpd.h +++ b/networking/udhcp/dhcpd.h @@ -27,23 +27,24 @@ struct static_lease { struct server_config_t { uint32_t server; /* Our IP, in network order */ - uint32_t start; /* Start address of leases, network order */ - uint32_t end; /* End of leases, network order */ + /* 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 */ struct option_set *options; /* List of DHCP options loaded from the config file */ char *interface; /* The name of the interface to use */ int ifindex; /* Index number of the interface to use */ uint8_t arp[6]; /* Our arp address */ - unsigned long lease; /* lease time in seconds (host order) */ - unsigned long max_leases; /* maximum number of leases (including reserved address) */ char remaining; /* should the lease file be interpreted as lease time remaining, or * as the time the lease expires */ + unsigned long lease; /* lease time in seconds (host order) */ + unsigned long max_leases; /* maximum number of leases (including reserved address) */ unsigned long auto_time; /* how long should udhcpd wait before writing a config file. * if this is zero, it will only write one on SIGUSR1 */ unsigned long decline_time; /* how long an address is reserved if a client returns a * decline message */ unsigned long conflict_time; /* how long an arp conflict offender is leased for */ unsigned long offer_time; /* how long an offered address is reserved */ - unsigned long min_lease; /* minimum lease a client can request*/ + unsigned long min_lease; /* minimum lease a client can request */ char *lease_file; char *pidfile; char *notify_file; /* What to run whenever leases are written */ @@ -95,13 +96,6 @@ int send_inform(struct dhcpMessage *oldpacket); /*** files.h ***/ -struct config_keyword { - const char *keyword; - int (* const handler)(const char *line, void *var); - void *var; - const char *def; -}; - int read_config(const char *file); void write_leases(void); void read_leases(const char *file); diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c index 41c8717cd..7fc734889 100644 --- a/networking/udhcp/files.c +++ b/networking/udhcp/files.c @@ -11,42 +11,30 @@ #include "options.h" -/* - * Domain names may have 254 chars, and string options can be 254 - * chars long. However, 80 bytes will be enough for most, and won't - * hog up memory. If you have a special application, change it - */ -#define READ_CONFIG_BUF_SIZE 80 - -/* on these functions, make sure you datatype matches */ +/* on these functions, make sure your datatype matches */ static int read_ip(const char *line, void *arg) { len_and_sockaddr *lsa; - int retval = 0; lsa = host_and_af2sockaddr(line, 0, AF_INET); if (lsa) { - *(struct in_addr*)arg = lsa->sin.sin_addr; + *(uint32_t*)arg = lsa->sin.sin_addr.s_addr; free(lsa); - retval = 1; + return 1; } - return retval; + return 0; } static int read_mac(const char *line, void *arg) { uint8_t *mac_bytes = arg; struct ether_addr *temp_ether_addr; - int retval = 1; temp_ether_addr = ether_aton(line); - if (temp_ether_addr == NULL) - retval = 0; - else - memcpy(mac_bytes, temp_ether_addr, 6); - - return retval; + return 0; + memcpy(mac_bytes, temp_ether_addr, 6); + return 1; } @@ -56,14 +44,13 @@ static int read_str(const char *line, void *arg) free(*dest); *dest = xstrdup(line); - return 1; } static int read_u32(const char *line, void *arg) { - *((uint32_t*)arg) = bb_strtou32(line, NULL, 10); + *(uint32_t*)arg = bb_strtou32(line, NULL, 10); return errno == 0; } @@ -71,15 +58,16 @@ static int read_u32(const char *line, void *arg) static int read_yn(const char *line, void *arg) { char *dest = arg; - int retval = 1; - if (!strcasecmp("yes", line)) + if (!strcasecmp("yes", line)) { *dest = 1; - else if (!strcasecmp("no", line)) + return 1; + } + if (!strcasecmp("no", line)) { *dest = 0; - else retval = 0; - - return retval; + return 1; + } + return 0; } @@ -89,8 +77,9 @@ struct option_set *find_option(struct option_set *opt_list, char code) while (opt_list && opt_list->data[OPT_CODE] < code) opt_list = opt_list->next; - if (opt_list && opt_list->data[OPT_CODE] == code) return opt_list; - else return NULL; + if (opt_list && opt_list->data[OPT_CODE] == code) + return opt_list; + return NULL; } @@ -111,7 +100,7 @@ static void attach_option(struct option_set **opt_list, #endif /* make a new option */ - new = xmalloc(sizeof(struct option_set)); + new = xmalloc(sizeof(*new)); new->data = xmalloc(length + 2); new->data[OPT_CODE] = option->code; new->data[OPT_LEN] = length; @@ -184,7 +173,7 @@ static int read_opt(const char *const_line, void *arg) return 0; if (!strcasecmp(option->name, opt)) break; - option++; + option++; } do { @@ -199,8 +188,11 @@ static int read_opt(const char *const_line, void *arg) break; case OPTION_IP_PAIR: retval = read_ip(val, buffer); - if (!(val = strtok(NULL, ", \t/-"))) retval = 0; - if (retval) retval = read_ip(val, buffer + 4); + val = strtok(NULL, ", \t/-"); + if (!val) + retval = 0; + if (retval) + retval = read_ip(val, buffer + 4); break; case OPTION_STRING: #if ENABLE_FEATURE_RFC3397 @@ -220,22 +212,33 @@ static int read_opt(const char *const_line, void *arg) buffer[0] = strtoul(val, &endptr, 0); retval = (endptr[0] == '\0'); break; - case OPTION_U16: - *result_u16 = htons(strtoul(val, &endptr, 0)); - retval = (endptr[0] == '\0'); + /* htonX are macros in older libc's, using temp var + * in code below for safety */ + /* TODO: use bb_strtoX? */ + case OPTION_U16: { + unsigned long tmp = strtoul(val, &endptr, 0); + *result_u16 = htons(tmp); + retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/); break; - case OPTION_S16: - *result_u16 = htons(strtol(val, &endptr, 0)); + } + case OPTION_S16: { + long tmp = strtol(val, &endptr, 0); + *result_u16 = htons(tmp); retval = (endptr[0] == '\0'); break; - case OPTION_U32: - *result_u32 = htonl(strtoul(val, &endptr, 0)); + } + case OPTION_U32: { + unsigned long tmp = strtoul(val, &endptr, 0); + *result_u32 = htonl(tmp); retval = (endptr[0] == '\0'); break; - case OPTION_S32: - *result_u32 = htonl(strtol(val, &endptr, 0)); + } + case OPTION_S32: { + long tmp = strtol(val, &endptr, 0); + *result_u32 = htonl(tmp); retval = (endptr[0] == '\0'); break; + } default: break; } @@ -253,7 +256,6 @@ static int read_staticlease(const char *const_line, void *arg) uint8_t *mac_bytes; uint32_t *ip; - /* Allocate memory for addresses */ mac_bytes = xmalloc(sizeof(unsigned char) * 8); ip = xmalloc(sizeof(uint32_t)); @@ -275,39 +277,54 @@ static int read_staticlease(const char *const_line, void *arg) } +struct config_keyword { + const char *keyword; + int (*handler)(const char *line, void *var); + void *var; + const char *def; +}; + static const struct config_keyword keywords[] = { - /* keyword handler variable address default */ - {"start", read_ip, &(server_config.start), "192.168.0.20"}, - {"end", read_ip, &(server_config.end), "192.168.0.254"}, - {"interface", read_str, &(server_config.interface), "eth0"}, - {"option", read_opt, &(server_config.options), ""}, - {"opt", read_opt, &(server_config.options), ""}, - {"max_leases", read_u32, &(server_config.max_leases), "254"}, - {"remaining", read_yn, &(server_config.remaining), "yes"}, - {"auto_time", read_u32, &(server_config.auto_time), "7200"}, - {"decline_time",read_u32, &(server_config.decline_time),"3600"}, - {"conflict_time",read_u32,&(server_config.conflict_time),"3600"}, - {"offer_time", read_u32, &(server_config.offer_time), "60"}, - {"min_lease", read_u32, &(server_config.min_lease), "60"}, - {"lease_file", read_str, &(server_config.lease_file), LEASES_FILE}, - {"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"}, - {"notify_file", read_str, &(server_config.notify_file), ""}, - {"siaddr", read_ip, &(server_config.siaddr), "0.0.0.0"}, - {"sname", read_str, &(server_config.sname), ""}, - {"boot_file", read_str, &(server_config.boot_file), ""}, - {"static_lease",read_staticlease, &(server_config.static_leases), ""}, - /*ADDME: static lease */ - {"", NULL, NULL, ""} + /* keyword handler variable address default */ + {"start", read_ip, &(server_config.start_ip), "192.168.0.20"}, + {"end", read_ip, &(server_config.end_ip), "192.168.0.254"}, + {"interface", read_str, &(server_config.interface), "eth0"}, + {"option", read_opt, &(server_config.options), ""}, + {"opt", read_opt, &(server_config.options), ""}, + /* Avoid "max_leases value not sane" warning by setting default + * to default_end_ip - default_start_ip + 1: */ + {"max_leases", read_u32, &(server_config.max_leases), "235"}, + {"remaining", read_yn, &(server_config.remaining), "yes"}, + {"auto_time", read_u32, &(server_config.auto_time), "7200"}, + {"decline_time", read_u32, &(server_config.decline_time), "3600"}, + {"conflict_time",read_u32, &(server_config.conflict_time),"3600"}, + {"offer_time", read_u32, &(server_config.offer_time), "60"}, + {"min_lease", read_u32, &(server_config.min_lease), "60"}, + {"lease_file", read_str, &(server_config.lease_file), LEASES_FILE}, + {"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"}, + {"notify_file", read_str, &(server_config.notify_file), ""}, + {"siaddr", read_ip, &(server_config.siaddr), "0.0.0.0"}, + {"sname", read_str, &(server_config.sname), ""}, + {"boot_file", read_str, &(server_config.boot_file), ""}, + {"static_lease", read_staticlease, &(server_config.static_leases), ""}, + /* ADDME: static lease */ }; +/* + * Domain names may have 254 chars, and string options can be 254 + * chars long. However, 80 bytes will be enough for most, and won't + * hog up memory. If you have a special application, change it + */ +#define READ_CONFIG_BUF_SIZE 80 + int read_config(const char *file) { FILE *in; char buffer[READ_CONFIG_BUF_SIZE], *token, *line; int i, lm = 0; - for (i = 0; keywords[i].keyword[0]; i++) + for (i = 0; i < ARRAY_SIZE(keywords); i++) if (keywords[i].def[0]) keywords[i].handler(keywords[i].def, keywords[i].var); @@ -337,7 +354,7 @@ int read_config(const char *file) while (i >= 0 && isspace(line[i])) line[i--] = '\0'; - for (i = 0; keywords[i].keyword[0]; i++) + for (i = 0; i < ARRAY_SIZE(keywords); i++) if (!strcasecmp(token, keywords[i].keyword)) if (!keywords[i].handler(line, keywords[i].var)) { bb_error_msg("cannot parse line %d of %s", lm, file); @@ -348,6 +365,10 @@ int read_config(const char *file) } } fclose(in); + + server_config.start_ip = ntohl(server_config.start_ip); + server_config.end_ip = ntohl(server_config.end_ip); + return 1; } @@ -408,9 +429,11 @@ void read_leases(const char *file) && full_read(fp, &lease, sizeof(lease)) == sizeof(lease) ) { /* ADDME: is it a static lease */ - if (lease.yiaddr >= server_config.start && lease.yiaddr <= server_config.end) { + uint32_t y = ntohl(lease.yiaddr); + if (y >= server_config.start_ip && y <= server_config.end_ip) { lease.expires = ntohl(lease.expires); - if (!server_config.remaining) lease.expires -= time(0); + if (!server_config.remaining) + lease.expires -= time(0); if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) { bb_error_msg("too many leases while loading %s", file); break; diff --git a/networking/udhcp/leases.c b/networking/udhcp/leases.c index 5d8775f63..ceec07345 100644 --- a/networking/udhcp/leases.c +++ b/networking/udhcp/leases.c @@ -119,8 +119,8 @@ uint32_t find_address(int check_expired) uint32_t addr, ret; struct dhcpOfferedAddr *lease = NULL; - addr = ntohl(server_config.start); /* addr is in host order here */ - for (;addr <= ntohl(server_config.end); addr++) { + addr = server_config.start_ip; /* addr is in host order here */ + for (;addr <= server_config.end_ip; addr++) { /* ie, 192.168.55.0 */ if (!(addr & 0xFF)) continue; diff --git a/networking/udhcp/serverpacket.c b/networking/udhcp/serverpacket.c index e1a88addd..ecbf50a14 100644 --- a/networking/udhcp/serverpacket.c +++ b/networking/udhcp/serverpacket.c @@ -122,19 +122,18 @@ int sendOffer(struct dhcpMessage *oldpacket) if (!lease_expired(lease)) lease_time_align = lease->expires - time(0); packet.yiaddr = lease->yiaddr; - /* Or the client has a requested ip */ } else if ((req = get_option(oldpacket, DHCP_REQUESTED_IP)) - /* Don't look here (ugly hackish thing to do) */ - && memcpy(&req_align, req, 4) - /* and the ip is in the lease range */ - && ntohl(req_align) >= ntohl(server_config.start) - && ntohl(req_align) <= ntohl(server_config.end) - && !static_lease_ip /* Check that its not a static lease */ - /* and is not already taken/offered */ - && (!(lease = find_lease_by_yiaddr(req_align)) - /* or its taken, but expired */ /* ADDME: or maybe in here */ - || lease_expired(lease)) + /* Don't look here (ugly hackish thing to do) */ + && memcpy(&req_align, req, 4) + /* and the ip is in the lease range */ + && ntohl(req_align) >= server_config.start_ip + && ntohl(req_align) <= server_config.end_ip + && !static_lease_ip /* Check that its not a static lease */ + /* and is not already taken/offered */ + && (!(lease = find_lease_by_yiaddr(req_align)) + /* or its taken, but expired */ /* ADDME: or maybe in here */ + || lease_expired(lease)) ) { packet.yiaddr = req_align; /* FIXME: oh my, is there a host using this IP? */ /* otherwise, find a free IP */ @@ -142,7 +141,8 @@ int sendOffer(struct dhcpMessage *oldpacket) /* Is it a static lease? (No, because find_address skips static lease) */ packet.yiaddr = find_address(0); /* try for an expired lease */ - if (!packet.yiaddr) packet.yiaddr = find_address(1); + if (!packet.yiaddr) + packet.yiaddr = find_address(1); } if (!packet.yiaddr) { @@ -209,7 +209,8 @@ int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr) init_packet(&packet, oldpacket, DHCPACK); packet.yiaddr = yiaddr; - if ((lease_time = get_option(oldpacket, DHCP_LEASE_TIME))) { + lease_time = get_option(oldpacket, DHCP_LEASE_TIME); + if (lease_time) { memcpy(&lease_time_align, lease_time, 4); lease_time_align = ntohl(lease_time_align); if (lease_time_align > server_config.lease) @@ -236,6 +237,10 @@ int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr) return -1; add_lease(packet.chaddr, packet.yiaddr, lease_time_align); + if (ENABLE_FEATURE_UDHCPD_WRITE_LEASES_EARLY) { + /* rewrite the file with leases at every new acceptance */ + write_leases(); + } return 0; } diff --git a/networking/udhcp/socket.c b/networking/udhcp/socket.c index d294fb259..be5985f88 100644 --- a/networking/udhcp/socket.c +++ b/networking/udhcp/socket.c @@ -43,7 +43,7 @@ int read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t struct ifreq ifr; struct sockaddr_in *our_ip; - memset(&ifr, 0, sizeof(struct ifreq)); + memset(&ifr, 0, sizeof(ifr)); fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if (fd < 0) { bb_perror_msg("socket failed"); @@ -54,7 +54,8 @@ int read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name)); if (addr) { if (ioctl(fd, SIOCGIFADDR, &ifr) != 0) { - bb_perror_msg("SIOCGIFADDR failed, is the interface up and configured?"); + bb_perror_msg("SIOCGIFADDR failed (is interface %s " + "up and configured?)", interface); close(fd); return -1; } @@ -117,7 +118,7 @@ int listen_socket(uint32_t ip, int port, const char *inf) return -1; } - if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) { + if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) { close(fd); return -1; } |