/* vi: set sw=4 ts=4: */ /* * ifupdown for busybox * Copyright (c) 2002 Glenn McGrath * Copyright (c) 2003-2004 Erik Andersen * * Based on ifupdown v 0.6.4 by Anthony Towns * Copyright (c) 1999 Anthony Towns * * Changes to upstream version * Remove checks for kernel version, assume kernel version 2.2.0 or better. * Lines in the interfaces file cannot wrap. * To adhere to the FHS, the default state file is /var/run/ifstate. * * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. */ #include #include #include #include "libbb.h" #define MAX_OPT_DEPTH 10 #define EUNBALBRACK 10001 #define EUNDEFVAR 10002 #define EUNBALPER 10000 #if ENABLE_FEATURE_IFUPDOWN_MAPPING #define MAX_INTERFACE_LENGTH 10 #endif #define debug_noise(args...) /*fprintf(stderr, args)*/ /* Forward declaration */ struct interface_defn_t; typedef int execfn(char *command); struct method_t { const char *name; int (*up)(struct interface_defn_t *ifd, execfn *e); int (*down)(struct interface_defn_t *ifd, execfn *e); }; struct address_family_t { const char *name; int n_methods; const struct method_t *method; }; struct mapping_defn_t { struct mapping_defn_t *next; int max_matches; int n_matches; char **match; char *script; int max_mappings; int n_mappings; char **mapping; }; struct variable_t { char *name; char *value; }; struct interface_defn_t { const struct address_family_t *address_family; const struct method_t *method; char *iface; int max_options; int n_options; struct variable_t *option; }; struct interfaces_file_t { llist_t *autointerfaces; llist_t *ifaces; struct mapping_defn_t *mappings; }; #define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") "i:" enum { OPT_do_all = 0x1, OPT_no_act = 0x2, OPT_verbose = 0x4, OPT_force = 0x8, OPT_no_mappings = 0x10, }; #define DO_ALL (option_mask32 & OPT_do_all) #define NO_ACT (option_mask32 & OPT_no_act) #define VERBOSE (option_mask32 & OPT_verbose) #define FORCE (option_mask32 & OPT_force) #define NO_MAPPINGS (option_mask32 & OPT_no_mappings) static char **my_environ; static const char *startup_PATH; #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6 #if ENABLE_FEATURE_IFUPDOWN_IP static unsigned count_bits(unsigned a) { unsigned result; result = (a & 0x55) + ((a >> 1) & 0x55); result = (result & 0x33) + ((result >> 2) & 0x33); return (result & 0x0F) + ((result >> 4) & 0x0F); } static int count_netmask_bits(char *dotted_quad) { unsigned result, a, b, c, d; /* Found a netmask... Check if it is dotted quad */ if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4) return -1; // FIXME: will be confused by e.g. 255.0.255.0 result = count_bits(a); result += count_bits(b); result += count_bits(c); result += count_bits(d); return (int)result; } #endif static void addstr(char **bufp, const char *str, size_t str_length) { /* xasprintf trick will be smaller, but we are often * called with str_length == 1 - don't want to have * THAT much of malloc/freeing! */ char *buf = *bufp; int len = (buf ? strlen(buf) : 0); str_length++; buf = xrealloc(buf, len + str_length); /* copies at most str_length-1 chars! */ safe_strncpy(buf + len, str, str_length); *bufp = buf; } static int strncmpz(const char *l, const char *r, size_t llen) { int i = strncmp(l, r, llen); if (i == 0) return -r[llen]; return i; } static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd) { int i; if (strncmpz(id, "iface", idlen) == 0) { char *result; static char label_buf[20]; safe_strncpy(label_buf, ifd->iface, sizeof(label_buf)); result = strchr(label_buf, ':'); if (result) { *result = '\0'; } return label_buf; } if (strncmpz(id, "label", idlen) == 0) { return ifd->iface; } for (i = 0; i < ifd->n_options; i++) { if (strncmpz(id, ifd->option[i].name, idlen) == 0) { return ifd->option[i].value; } } return NULL; } static char *parse(const char *command, struct interface_defn_t *ifd) { size_t old_pos[MAX_OPT_DEPTH] = { 0 }; int okay[MAX_OPT_DEPTH] = { 1 }; int opt_depth = 1; char *result = NULL; while (*command) { switch (*command) { default: addstr(&result, command, 1); command++; break; case '\\': if (command[1]) { addstr(&result, command + 1, 1); command += 2; } else { addstr(&result, command, 1); command++; } break; case '[': if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) { old_pos[opt_depth] = result ? strlen(result) : 0; okay[opt_depth] = 1; opt_depth++; command += 2; } else { addstr(&result, "[", 1); command++; } break; case ']': if (command[1] == ']' && opt_depth > 1) { opt_depth--; if (!okay[opt_depth]) { result[old_pos[opt_depth]] = '\0'; } command += 2; } else { addstr(&result, "]", 1); command++; } break; case '%': { char *nextpercent; char *varvalue; command++; nextpercent = strchr(command, '%'); if (!nextpercent) { errno = EUNBALPER; free(result); return NULL; } varvalue = get_var(command, nextpercent - command, ifd); if (varvalue) { addstr(&result, varvalue, strlen(varvalue)); } else { #if ENABLE_FEATURE_IFUPDOWN_IP /* Sigh... Add a special case for 'ip' to convert from * dotted quad to bit count style netmasks. */ if (strncmp(command, "bnmask", 6) == 0) { unsigned res; varvalue = get_var("netmask", 7, ifd); if (varvalue && (res = count_netmask_bits(varvalue)) > 0) { const char *argument = utoa(res); addstr(&result, argument, strlen(argument)); command = nextpercent + 1; break; } } #endif okay[opt_depth - 1] = 0; } command = nextpercent + 1; } break; } } if (opt_depth > 1) { errno = EUNBALBRACK; free(result); return NULL; } if (!okay[0]) { errno = EUNDEFVAR; free(result); return NULL; } return result; } /* execute() returns 1 for success and 0 for failure */ static int execute(const char *command, struct interface_defn_t *ifd, execfn *exec) { char *out; int ret; out = parse(command, ifd); if (!out) { /* parse error? */ return 0; } /* out == "": parsed ok but not all needed variables known, skip */ ret = out[0] ? (*exec)(out) : 1; free(out); if (ret != 1) { return 0; } return 1; } #endif #if ENABLE_FEATURE_IFUPDOWN_IPV6 static int loopback_up6(struct interface_defn_t *ifd, execfn *exec) { #if ENABLE_FEATURE_IFUPDOWN_IP int result; result = execute("ip addr add ::1 dev %iface%", ifd, exec); result += execute("ip link set %iface% up", ifd, exec); return ((result == 2) ? 2 : 0); #else return execute("ifconfig %iface% add ::1", ifd, exec); #endif } static int loopback_down6(struct interface_defn_t *ifd, execfn *exec) { #if ENABLE_FEATURE_IFUPDOWN_IP return execute("ip link set %iface% down", ifd, exec); #else return execute("ifconfig %iface% del ::1", ifd, exec); #endif } static int static_up6(struct interface_defn_t *ifd, execfn *exec) { int result; #if ENABLE_FEATURE_IFUPDOWN_IP result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec); result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec); /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */ result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec); #else result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec); result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec); result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec); #endif return ((result == 3) ? 3 : 0); } static int static_down6(struct interface_defn_t *ifd, execfn *exec) { #if ENABLE_FEATURE_IFUPDOWN_IP return execute("ip link set %iface% down", ifd, exec); #else return execute("ifconfig %iface% down", ifd, exec); #endif } #if ENABLE_FEATURE_IFUPDOWN_IP static int v4tunnel_up(struct interface_defn_t *ifd, execfn *exec) { int result; result = execute("ip tunnel add %iface% mode sit remote " "%endpoint%[[ local %local%]][[ ttl %ttl%]]", ifd, exec); result += execute("ip link set %iface% up", ifd, exec); result += execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec); result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec); return ((result == 4) ? 4 : 0); } static int v4tunnel_down(struct interface_defn_t * ifd, execfn * exec) { return execute("ip tunnel del %iface%", ifd, exec); } #endif static const struct method_t methods6[] = { #if ENABLE_FEATURE_IFUPDOWN_IP { "v4tunnel", v4tunnel_up, v4tunnel_down, }, #endif { "static", static_up6, static_down6, }, { "loopback", loopback_up6, loopback_down6, }, }; static const struct address_family_t addr_inet6 = { "inet6", ARRAY_SIZE(methods6), methods6 }; #endif /* FEATURE_IFUPDOWN_IPV6 */ #if ENABLE_FEATURE_IFUPDOWN_IPV4 static int loopback_up(struct interface_defn_t *ifd, execfn *exec) { #if ENABLE_FEATURE_IFUPDOWN_IP int result; result = execute("ip addr add 127.0.0.1/8 dev %iface%", ifd, exec); result += execute("ip link set %iface% up", ifd, exec); return ((result == 2) ? 2 : 0); #else return execute("ifconfig %iface% 127.0.0.1 up", ifd, exec); #endif } static int loopback_down(struct interface_defn_t *ifd, execfn *exec) { #if ENABLE_FEATURE_IFUPDOWN_IP int result; result = execute("ip addr flush dev %iface%", ifd, exec); result += execute("ip link set %iface% down", ifd, exec); return ((result == 2) ? 2 : 0); #else return execute("ifconfig %iface% 127.0.0.1 down", ifd, exec); #endif } static int static_up(struct interface_defn_t *ifd, execfn *exec) { int result; #if ENABLE_FEATURE_IFUPDOWN_IP result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] " "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec); result += execute("ip link set[[ mtu %mtu%]][[ address %hwaddress%]] %iface% up", ifd, exec); result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec); return ((result == 3) ? 3 : 0); #else /* ifconfig said to set iface up before it processes hw %hwaddress%, * which then of course fails. Thus we run two separate ifconfig */ result = execute("ifconfig %iface%[[ hw %hwaddress%]][[ media %media%]][[ mtu %mtu%]] up", ifd, exec); result += execute("ifconfig %iface% %address% netmask %netmask%" "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ", ifd, exec); result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec); return ((result == 3) ? 3 : 0); #endif } static int static_down(struct interface_defn_t *ifd, execfn *exec) { int result; #if ENABLE_FEATURE_IFUPDOWN_IP result = execute("ip addr flush dev %iface%", ifd, exec); result += execute("ip link set %iface% down", ifd, exec); #else result = execute("[[route del default gw %gateway% %iface%]]", ifd, exec); result += execute("ifconfig %iface% down", ifd, exec); #endif return ((result == 2) ? 2 : 0); } #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP struct dhcp_client_t { const char *name; const char *startcmd; const char *stopcmd; }; static const struct dhcp_client_t ext_dhcp_clients[] = { { "dhcpcd", "dhcpcd[[ -h %hostname%]][[ -i %vendor%]][[ -I %clientid%]][[ -l %leasetime%]] %iface%", "dhcpcd -k %iface%", }, { "dhclient", "dhclient -pf /var/run/dhclient.%iface%.pid %iface%", "kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", }, { "pump", "pump -i %iface%[[ -h %hostname%]][[ -l %leasehours%]]", "pump -i %iface% -k", }, { "udhcpc", "udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]", "kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", }, }; #endif /* ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCPC */ static int dhcp_up(struct interface_defn_t *ifd, execfn *exec) { #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP int i ; for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) { if (exists_execable(ext_dhcp_clients[i].name)) return execute(ext_dhcp_clients[i].startcmd, ifd, exec); } bb_error_msg("no dhcp clients found"); return 0; #elif ENABLE_APP_UDHCPC return execute("udhcpc -R -n -p /var/run/udhcpc.%iface%.pid " "-i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]", ifd, exec); #else return 0; /* no dhcp support */ #endif } static int dhcp_down(struct interface_defn_t *ifd, execfn *exec) { #if ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCP int i ; for (i = 0; i < ARRAY_SIZE(ext_dhcp_clients); i++) { if (exists_execable(ext_dhcp_clients[i].name)) return execute(ext_dhcp_clients[i].stopcmd, ifd, exec); } bb_error_msg("no dhcp clients found, using static interface shutdown"); return static_down(ifd, exec); #elif ENABLE_APP_UDHCPC return execute("kill -TERM " "`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec); #else return 0; /* no support for dhcp */ #endif } static int manual_up_down(struct interface_defn_t *ifd, execfn *exec) { return 1; } static int bootp_up(struct interface_defn_t *ifd, execfn *exec) { return execute("bootpc[[ --bootfile %bootfile%]] --dev %iface%" "[[ --server %server%]][[ --hwaddr %hwaddr%]] " "--returniffail --serverbcast", ifd, exec); } static int ppp_up(struct interface_defn_t *ifd, execfn *exec) { return execute("pon[[ %provider%]]", ifd, exec); } static int ppp_down(struct interface_defn_t *ifd, execfn *exec) { return execute("poff[[ %provider%]]", ifd, exec); } static int wvdial_up(struct interface_defn_t *ifd, execfn *exec) { return execute("start-stop-daemon --start -x wvdial " "-p /var/run/wvdial.%iface% -b -m --[[ %provider%]]", ifd, exec); } static int wvdial_down(struct interface_defn_t *ifd, execfn *exec) { return execute("start-stop-daemon --stop -x wvdial " "-p /var/run/wvdial.%iface% -s 2", ifd, exec); } static const struct method_t methods[] = { { "manual", manual_up_down, manual_up_down, }, { "wvdial", wvdial_up, wvdial_down, }, { "ppp", ppp_up, ppp_down, }, { "static", static_up, static_down, }, { "bootp", bootp_up, static_down, }, { "dhcp", dhcp_up, dhcp_down, }, { "loopback", loopback_up, loopback_down, }, }; static const struct address_family_t addr_inet = { "inet", ARRAY_SIZE(methods), methods }; #endif /* if ENABLE_FEATURE_IFUPDOWN_IPV4 */ static char *next_word(char **buf) { unsigned short length; char *word; if (!buf || !*buf || !**buf) { return NULL; } /* Skip over leading whitespace */ word = skip_whitespace(*buf); /* Skip over comments */ if (*word == '#') { return NULL; } /* Find the length of this word */ length = strcspn(word, " \t\n"); if (length == 0) { return NULL; } *buf = word + length; /*DBU:[dave@cray.com] if we are already at EOL dont't increment beyond it */ if (**buf) { **buf = '\0'; (*buf)++; } return word; } static const struct address_family_t *get_address_family(const struct address_family_t *const af[], char *name) { int i; if (!name) return NULL; for (i = 0; af[i]; i++) { if (strcmp(af[i]->name, name) == 0) { return af[i]; } } return NULL; } static const struct method_t *get_method(const struct address_family_t *af, char *name) { int i; if (!name) return NULL; for (i = 0; i < af->n_methods; i++) { if (strcmp(af->method[i].name, name) == 0) { return &af->method[i]; } } return NULL; } static const llist_t *find_list_string(const llist_t *list, const char *string) { if (string == NULL) return NULL; while (list) { if (strcmp(list->data, string) == 0) { return list; } list = list->link; } return NULL; } static struct interfaces_file_t *read_interfaces(const char *filename) { #if ENABLE_FEATURE_IFUPDOWN_MAPPING struct mapping_defn_t *currmap = NULL; #endif struct interface_defn_t *currif = NULL; struct interfaces_file_t *defn; FILE *f; char *firstword; char *buf; enum { NONE, IFACE, MAPPING } currently_processing = NONE; defn = xzalloc(sizeof(struct interfaces_file_t)); f = xfopen(filename, "r"); while ((buf = xmalloc_getline(f)) != NULL) { char *buf_ptr = buf; firstword = next_word(&buf_ptr); if (firstword == NULL) { free(buf); continue; /* blank line */ } if (strcmp(firstword, "mapping") == 0) { #if ENABLE_FEATURE_IFUPDOWN_MAPPING currmap = xzalloc(sizeof(struct mapping_defn_t)); while ((firstword = next_word(&buf_ptr)) != NULL) { if (currmap->max_matches == currmap->n_matches) { currmap->max_matches = currmap->max_matches * 2 + 1; currmap->match = xrealloc(currmap->match, sizeof(currmap->match) * currmap->max_matches); } currmap->match[currmap->n_matches++] = xstrdup(firstword); } currmap->max_mappings = 0; currmap->n_mappings = 0; currmap->mapping = NULL; currmap->script = NULL; { struct mapping_defn_t **where = &defn->mappings; while (*where != NULL) { where = &(*where)->next; } *where = currmap; currmap->next = NULL; } debug_noise("Added mapping\n"); #endif currently_processing = MAPPING; } else if (strcmp(firstword, "iface") == 0) { static const struct address_family_t *const addr_fams[] = { #if ENABLE_FEATURE_IFUPDOWN_IPV4 &addr_inet, #endif #if ENABLE_FEATURE_IFUPDOWN_IPV6 &addr_inet6, #endif NULL }; char *iface_name; char *address_family_name; char *method_name; llist_t *iface_list; currif = xzalloc(sizeof(struct interface_defn_t)); iface_name = next_word(&buf_ptr); address_family_name = next_word(&buf_ptr); method_name = next_word(&buf_ptr); if (buf_ptr == NULL) { bb_error_msg("too few parameters for line \"%s\"", buf); return NULL; } /* ship any trailing whitespace */ buf_ptr = skip_whitespace(buf_ptr); if (buf_ptr[0] != '\0') { bb_error_msg("too many parameters \"%s\"", buf); return NULL; } currif->iface = xstrdup(iface_name); currif->address_family = get_address_family(addr_fams, address_family_name); if (!currif->address_family) { bb_error_msg("unknown address type \"%s\"", address_family_name); return NULL; } currif->method = get_method(currif->address_family, method_name); if (!currif->method) { bb_error_msg("unknown method \"%s\"", method_name); return NULL; } for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) { struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data; if ((strcmp(tmp->iface, currif->iface) == 0) && (tmp->address_family == currif->address_family)) { bb_error_msg("duplicate interface \"%s\"", tmp->iface); return NULL; } } llist_add_to_end(&(defn->ifaces), (char*)currif); debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name); currently_processing = IFACE; } else if (strcmp(firstword, "auto") == 0) { while ((firstword = next_word(&buf_ptr)) != NULL) { /* Check the interface isnt already listed */ if (find_list_string(defn->autointerfaces, firstword)) { bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf); } /* Add the interface to the list */ llist_add_to_end(&(defn->autointerfaces), xstrdup(firstword)); debug_noise("\nauto %s\n", firstword); } currently_processing = NONE; } else { switch (currently_processing) { case IFACE: { int i; if (strlen(buf_ptr) == 0) { bb_error_msg("option with empty value \"%s\"", buf); return NULL; } if (strcmp(firstword, "up") != 0 && strcmp(firstword, "down") != 0 && strcmp(firstword, "pre-up") != 0 && strcmp(firstword, "post-down") != 0) { for (i = 0; i < currif->n_options; i++) { if (strcmp(currif->option[i].name, firstword) == 0) { bb_error_msg("duplicate option \"%s\"", buf); return NULL; } } } } if (currif->n_options >= currif->max_options) { struct variable_t *opt; currif->max_options = currif->max_options + 10; opt = xrealloc(currif->option, sizeof(*opt) * currif->max_options); currif->option = opt; } currif->option[currif->n_options].name = xstrdup(firstword); currif->option[currif->n_options].value = xstrdup(buf_ptr); if (!currif->option[currif->n_options].name) { perror(filename); return NULL; } if (!currif->option[currif->n_options].value) { perror(filename); return NULL; } debug_noise("\t%s=%s\n", currif->option[currif->n_options].name, currif->option[currif->n_options].value); currif->n_options++; break; case MAPPING: #if ENABLE_FEATURE_IFUPDOWN_MAPPING if (strcmp(firstword, "script") == 0) { if (currmap->script != NULL) { bb_error_msg("duplicate script in mapping \"%s\"", buf); return NULL; } else { currmap->script = xstrdup(next_word(&buf_ptr)); } } else if (strcmp(firstword, "map") == 0) { if (currmap->max_mappings == currmap->n_mappings) { currmap->max_mappings = currmap->max_mappings * 2 + 1; currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings); } currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&buf_ptr)); currmap->n_mappings++; } else { bb_error_msg("misplaced option \"%s\"", buf); return NULL; } #endif break; case NONE: default: bb_error_msg("misplaced option \"%s\"", buf); return NULL; } } free(buf); } if (ferror(f) != 0) { bb_perror_msg_and_die("%s", filename); } fclose(f); return defn; } static char *setlocalenv(const char *format, const char *name, const char *value) { char *result; char *here; char *there; result = xasprintf(format, name, value); for (here = there = result; *there != '=' && *there; there++) { if (*there == '-') *there = '_'; if (isalpha(*there)) *there = toupper(*there); if (isalnum(*there) || *there == '_') { *here = *there; here++; } } memmove(here, there, strlen(there) + 1); return result; } static void set_environ(struct interface_defn_t *iface, const char *mode) { char **environend; int i; const int n_env_entries = iface->n_options + 5; char **ppch; if (my_environ != NULL) { for (ppch = my_environ; *ppch; ppch++) { free(*ppch); *ppch = NULL; } free(my_environ); } my_environ = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ )); environend = my_environ; for (i = 0; i < iface->n_options; i++) { if (strcmp(iface->option[i].name, "up") == 0 || strcmp(iface->option[i].name, "down") == 0 || strcmp(iface->option[i].name, "pre-up") == 0 || strcmp(iface->option[i].name, "post-down") == 0) { continue; } *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value); } *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface); *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name); *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name); *(environend++) = setlocalenv("%s=%s", "MODE", mode); *(environend++) = setlocalenv("%s=%s", "PATH", startup_PATH); } static int doit(char *str) { if (option_mask32 & (OPT_no_act|OPT_verbose)) { puts(str); } if (!(option_mask32 & OPT_no_act)) { pid_t child; int status; fflush(NULL); child = fork(); switch (child) { case -1: /* failure */ return 0; case 0: /* child */ execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, my_environ); exit(127); } waitpid(child, &status, 0); if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { return 0; } } return 1; } static int execute_all(struct interface_defn_t *ifd, const char *opt) { int i; char *buf; for (i = 0; i < ifd->n_options; i++) { if (strcmp(ifd->option[i].name, opt) == 0) { if (!doit(ifd->option[i].value)) { return 0; } } } buf = xasprintf("run-parts /etc/network/if-%s.d", opt); /* heh, we don't bother free'ing it */ return doit(buf); } static int check(char *str) { return str != NULL; } static int iface_up(struct interface_defn_t *iface) { if (!iface->method->up(iface, check)) return -1; set_environ(iface, "start"); if (!execute_all(iface, "pre-up")) return 0; if (!iface->method->up(iface, doit)) return 0; if (!execute_all(iface, "up")) return 0; return 1; } static int iface_down(struct interface_defn_t *iface) { if (!iface->method->down(iface,check)) return -1; set_environ(iface, "stop"); if (!execute_all(iface, "down")) return 0; if (!iface->method->down(iface, doit)) return 0; if (!execute_all(iface, "post-down")) return 0; return 1; } #if ENABLE_FEATURE_IFUPDOWN_MAPPING static int popen2(FILE **in, FILE **out, char *command, ...) { va_list ap; char *argv[11] = { command }; int argc; int infd[2], outfd[2]; pid_t pid; argc = 1; va_start(ap, command); while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) { argc++; } argv[argc] = NULL; /* make sure */ va_end(ap); if (pipe(infd) != 0) { return 0; } if (pipe(outfd) != 0) { close(infd[0]); close(infd[1]); return 0; } fflush(NULL); switch (pid = fork()) { case -1: /* failure */ close(infd[0]); close(infd[1]); close(outfd[0]); close(outfd[1]); return 0; case 0: /* child */ dup2(infd[0], 0); dup2(outfd[1], 1); close(infd[0]); close(infd[1]); close(outfd[0]); close(outfd[1]); BB_EXECVP(command, argv); exit(127); default: /* parent */ *in = fdopen(infd[1], "w"); *out = fdopen(outfd[0], "r"); close(infd[0]); close(outfd[1]); return pid; } /* unreached */ } static char *run_mapping(char *physical, struct mapping_defn_t * map) { FILE *in, *out; int i, status; pid_t pid; char *logical = xstrdup(physical); /* Run the mapping script. */ pid = popen2(&in, &out, map->script, physical, NULL); /* popen2() returns 0 on failure. */ if (pid == 0) return logical; /* Write mappings to stdin of mapping script. */ for (i = 0; i < map->n_mappings; i++) { fprintf(in, "%s\n", map->mapping[i]); } fclose(in); waitpid(pid, &status, 0); if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { /* If the mapping script exited successfully, try to * grab a line of output and use that as the name of the * logical interface. */ char *new_logical = xmalloc(MAX_INTERFACE_LENGTH); if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) { /* If we are able to read a line of output from the script, * remove any trailing whitespace and use this value * as the name of the logical interface. */ char *pch = new_logical + strlen(new_logical) - 1; while (pch >= new_logical && isspace(*pch)) *(pch--) = '\0'; free(logical); logical = new_logical; } else { /* If we are UNABLE to read a line of output, discard our * freshly allocated memory. */ free(new_logical); } } fclose(out); return logical; } #endif /* FEATURE_IFUPDOWN_MAPPING */ static llist_t *find_iface_state(llist_t *state_list, const char *iface) { unsigned short iface_len = strlen(iface); llist_t *search = state_list; while (search) { if ((strncmp(search->data, iface, iface_len) == 0) && (search->data[iface_len] == '=')) { return search; } search = search->link; } return NULL; } /* read the previous state from the state file */ static llist_t *read_iface_state(void) { llist_t *state_list = NULL; FILE *state_fp = fopen("/var/run/ifstate", "r"); if (state_fp) { char *start, *end_ptr; while ((start = xmalloc_fgets(state_fp)) != NULL) { /* We should only need to check for a single character */ end_ptr = start + strcspn(start, " \t\n"); *end_ptr = '\0'; llist_add_to(&state_list, start); } fclose(state_fp); } return state_list; } int ifupdown_main(int argc, char **argv); int ifupdown_main(int argc, char **argv) { int (*cmds)(struct interface_defn_t *) = NULL; struct interfaces_file_t *defn; llist_t *target_list = NULL; const char *interfaces = "/etc/network/interfaces"; bool any_failures = 0; cmds = iface_down; if (applet_name[2] == 'u') { /* ifup command */ cmds = iface_up; } getopt32(argc, argv, OPTION_STR, &interfaces); if (argc - optind > 0) { if (DO_ALL) bb_show_usage(); } else { if (!DO_ALL) bb_show_usage(); } debug_noise("reading %s file:\n", interfaces); defn = read_interfaces(interfaces); debug_noise("\ndone reading %s\n\n", interfaces); if (!defn) { return EXIT_FAILURE; } startup_PATH = getenv("PATH"); if (!startup_PATH) startup_PATH = ""; /* Create a list of interfaces to work on */ if (DO_ALL) { target_list = defn->autointerfaces; } else { llist_add_to_end(&target_list, argv[optind]); } /* Update the interfaces */ while (target_list) { llist_t *iface_list; struct interface_defn_t *currif; char *iface; char *liface; char *pch; bool okay = 0; unsigned cmds_ret; iface = xstrdup(target_list->data); target_list = target_list->link; pch = strchr(iface, '='); if (pch) { *pch = '\0'; liface = xstrdup(pch + 1); } else { liface = xstrdup(iface); } if (!FORCE) { llist_t *state_list = read_iface_state(); const llist_t *iface_state = find_iface_state(state_list, iface); if (cmds == iface_up) { /* ifup */ if (iface_state) { bb_error_msg("interface %s already configured", iface); continue; } } else { /* ifdown */ if (!iface_state) { bb_error_msg("interface %s not configured", iface); continue; } } llist_free(state_list, free); } #if ENABLE_FEATURE_IFUPDOWN_MAPPING if ((cmds == iface_up) && !NO_MAPPINGS) { struct mapping_defn_t *currmap; for (currmap = defn->mappings; currmap; currmap = currmap->next) { int i; for (i = 0; i < currmap->n_matches; i++) { if (fnmatch(currmap->match[i], liface, 0) != 0) continue; if (VERBOSE) { printf("Running mapping script %s on %s\n", currmap->script, liface); } liface = run_mapping(iface, currmap); break; } } } #endif iface_list = defn->ifaces; while (iface_list) { currif = (struct interface_defn_t *) iface_list->data; if (strcmp(liface, currif->iface) == 0) { char *oldiface = currif->iface; okay = 1; currif->iface = iface; debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name); /* Call the cmds function pointer, does either iface_up() or iface_down() */ cmds_ret = cmds(currif); if (cmds_ret == -1) { bb_error_msg("don't seem to have all the variables for %s/%s", liface, currif->address_family->name); any_failures = 1; } else if (cmds_ret == 0) { any_failures = 1; } currif->iface = oldiface; } iface_list = iface_list->link; } if (VERBOSE) { puts(""); } if (!okay && !FORCE) { bb_error_msg("ignoring unknown interface %s", liface); any_failures = 1; } else if (!NO_ACT) { /* update the state file */ FILE *state_fp; llist_t *state; llist_t *state_list = read_iface_state(); llist_t *iface_state = find_iface_state(state_list, iface); if (cmds == iface_up) { char * const newiface = xasprintf("%s=%s", iface, liface); if (iface_state == NULL) { llist_add_to_end(&state_list, newiface); } else { free(iface_state->data); iface_state->data = newiface; } } else { /* Remove an interface from state_list */ llist_unlink(&state_list, iface_state); free(llist_pop(&iface_state)); } /* Actually write the new state */ state_fp = xfopen("/var/run/ifstate", "w"); state = state_list; while (state) { if (state->data) { fprintf(state_fp, "%s\n", state->data); } state = state->link; } fclose(state_fp); llist_free(state_list, free); } } return any_failures; }