/* * ifupdown for busybox * Based on ifupdown by Anthony Towns * Copyright (c) 1999 Anthony Towns * * Remove checks for kernel version, assume kernel version 2.2.0 or better * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "libbb.h" //#include "busybox.h" //#include "config.h" #define IFUPDOWN_VERSION "0.6.4" typedef struct interface_defn interface_defn; typedef int (execfn)(char *command); typedef int (command_set)(interface_defn *ifd, execfn *e); typedef struct method { char *name; command_set *up; command_set *down; } method; typedef struct address_family { char *name; int n_methods; method *method; } address_family; #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING typedef struct mapping_defn { struct mapping_defn *next; int max_matches; int n_matches; char **match; char *script; int max_mappings; int n_mappings; char **mapping; } mapping_defn; #endif typedef struct variable { char *name; char *value; } variable; struct interface_defn { struct interface_defn *next; char *iface; address_family *address_family; method *method; int automatic; int max_options; int n_options; variable *option; }; typedef struct interfaces_file { int max_autointerfaces; int n_autointerfaces; char **autointerfaces; interface_defn *ifaces; #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING mapping_defn *mappings; #endif } interfaces_file; #define MAX_OPT_DEPTH 10 #define EUNBALBRACK 10001 #define EUNDEFVAR 10002 #define MAX_VARNAME 32 #define EUNBALPER 10000 static int no_act = 0; static int verbose = 0; static char **environ = NULL; static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length) { if (*pos + str_length >= *len) { char *newbuf; newbuf = xrealloc(*buf, *len * 2 + str_length + 1); *buf = newbuf; *len = *len * 2 + str_length + 1; } while (str_length-- >= 1) { (*buf)[(*pos)++] = *str; str++; } (*buf)[*pos] = '\0'; } static int strncmpz(char *l, char *r, size_t llen) { int i = strncmp(l, r, llen); if (i == 0) { return(-r[llen]); } else { return(i); } } static char *get_var(char *id, size_t idlen, interface_defn *ifd) { int i; if (strncmpz(id, "iface", idlen) == 0) { return (ifd->iface); } else { 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(char *command, interface_defn *ifd) { char *result = NULL; size_t pos = 0, len = 0; size_t old_pos[MAX_OPT_DEPTH] = { 0 }; int okay[MAX_OPT_DEPTH] = { 1 }; int opt_depth = 1; while (*command) { switch (*command) { default: addstr(&result, &len, &pos, command, 1); command++; break; case '\\': if (command[1]) { addstr(&result, &len, &pos, command + 1, 1); command += 2; } else { addstr(&result, &len, &pos, command, 1); command++; } break; case '[': if (command[1] == '[' && opt_depth < MAX_OPT_DEPTH) { old_pos[opt_depth] = pos; okay[opt_depth] = 1; opt_depth++; command += 2; } else { addstr(&result, &len, &pos, "[", 1); command++; } break; case ']': if (command[1] == ']' && opt_depth > 1) { opt_depth--; if (!okay[opt_depth]) { pos = old_pos[opt_depth]; result[pos] = '\0'; } command += 2; } else { addstr(&result, &len, &pos, "]", 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, &len, &pos, varvalue, xstrlen(varvalue)); } else { 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); } static int execute(char *command, interface_defn *ifd, execfn *exec) { char *out; int ret; out = parse(command, ifd); if (!out) { return(0); } ret = (*exec) (out); free(out); return(ret); } #ifdef CONFIG_FEATURE_IFUPDOWN_IPX static int static_up_ipx(interface_defn *ifd, execfn *exec) { if (!execute("ipx_interface add %iface% %frame% %netnum%", ifd, exec)) { return(0); } return(1); } static int static_down_ipx(interface_defn *ifd, execfn *exec) { if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) { return(0); } return(1); } static int dynamic_up(interface_defn *ifd, execfn *exec) { if (!execute("ipx_interface add %iface% %frame%", ifd, exec)) { return(0); } return(1); } static int dynamic_down(interface_defn *ifd, execfn *exec) { if (!execute("ipx_interface del %iface% %frame%", ifd, exec)) { return(0); } return(1); } static method methods_ipx[] = { { "dynamic", dynamic_up, dynamic_down, }, { "static", static_up_ipx, static_down_ipx, }, }; address_family addr_ipx = { "ipx", sizeof(methods_ipx) / sizeof(struct method), methods_ipx }; #endif /* IFUP_FEATURE_IPX */ #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6 static int loopback_up6(interface_defn *ifd, execfn *exec) { if (!execute("ifconfig %iface% add ::1", ifd, exec)) { return(0); } return(1); } static int loopback_down6(interface_defn *ifd, execfn *exec) { if (!execute("ifconfig %iface% del ::1", ifd, exec)) return(0); } return(1); } static int static_up6(interface_defn *ifd, execfn *exec) { if (!execute("ifconfig %iface% [[media %media%]] [[hw %hwaddress%]] [[mtu %mtu%]] up", ifd, exec)) { return(0); } if (!execute("ifconfig %iface% add %address%/%netmask%", ifd, exec)) { return(0); } if (!execute("[[ route -A inet6 add ::/0 gw %gateway% ]]", ifd, exec)) { return(0); } return(1); } static int static_down6(interface_defn *ifd, execfn *exec) { if (!execute("ifconfig %iface% down", ifd, exec)) { return(0); } return(1); } static int v4tunnel_up(interface_defn *ifd, execfn *exec) { if (!execute("ip tunnel add %iface% mode sit remote %endpoint% [[local %local%]] [[ttl %ttl%]]", ifd, exec)) { return(0); } if (!execute("ip link set %iface% up", ifd, exec)) { return(0); } if (!execute("ip addr add %address%/%netmask% dev %iface%", ifd, exec)) { return(0); } if (!execute("[[ ip route add ::/0 via %gateway% ]]", ifd, exec)) { return(0); } return(1); } static int v4tunnel_down(interface_defn * ifd, execfn * exec) { if (!execute("ip tunnel del %iface%", ifd, exec)) { return(0); } return(1); } static method methods6[] = { { "v4tunnel", v4tunnel_up, v4tunnel_down, }, { "static", static_up6, static_down6, }, { "loopback", loopback_up6, loopback_down6, }, }; address_family addr_inet6 = { "inet6", sizeof(methods6) / sizeof(struct method), methods6 }; #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */ #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 static int loopback_up(interface_defn *ifd, execfn *exec) { if (!execute("ifconfig %iface% 127.0.0.1 up", ifd, exec)) { return(0); } return(1); } static int loopback_down(interface_defn *ifd, execfn *exec) { if (!execute("ifconfig %iface% down", ifd, exec)) { return(0); } return(1); } static int static_up(interface_defn *ifd, execfn *exec) { if (!execute("ifconfig %iface% %address% netmask %netmask% [[broadcast %broadcast%]] [[pointopoint %pointopoint%]] [[media %media%]] [[mtu %mtu%]] [[hw %hwaddress%]] up", ifd, exec)) { return(0); } if (!execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec)) { return(0); } return(1); } static int static_down(interface_defn *ifd, execfn *exec) { if (!execute("[[ route del default gw %gateway% %iface% ]]", ifd, exec)) { return(0); } if (!execute("ifconfig %iface% down", ifd, exec)) { return(0); } return(1); } static int execable(char *program) { struct stat buf; if (0 == stat(program, &buf)) { if (S_ISREG(buf.st_mode) && (S_IXUSR & buf.st_mode)) { return(1); } } return(0); } static int dhcp_up(interface_defn *ifd, execfn *exec) { if (execable("/sbin/dhclient")) { if (!execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)) { return(0); } } else if (execable("/sbin/pump")) { if (!execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)) { return(0); } } else if (execable("/sbin/udhcpc")) { if (!execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i %iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)) { return 0; } } else if (execable("/sbin/dhcpcd")) { if (!execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] [[-l %leasetime%]] %iface%", ifd, exec)) { return(0); } } return(1); } static int dhcp_down(interface_defn *ifd, execfn *exec) { if (execable("/sbin/dhclient")) { if (!execute("cat /var/run/dhclient.%iface%.pid | xargs -i kill -TERM {}", ifd, exec)) { return(0); } } else if (execable("/sbin/pump")) { if (!execute("pump -i %iface% -k", ifd, exec)) { return(0); } } else if (execable("/sbin/udhcpc")) { if (!execute("cat /var/run/udhcpc.%iface%.pid | xargs -i kill -TERM {}", ifd, exec)) { return(0); } } else if (execable("/sbin/dhcpcd")) { if (!execute("dhcpcd -k %iface%", ifd, exec)) { return(0); } } if (!execute("ifconfig %iface% down", ifd, exec)) { return(0); } return(1); } static int bootp_up(interface_defn *ifd, execfn *exec) { if (!execute("bootpc [[--bootfile %bootfile%]] --dev %iface% [[--server %server%]] [[--hwaddr %hwaddr%]] --returniffail --serverbcast", ifd, exec)) { return 0; } return 1; } static int bootp_down(interface_defn *ifd, execfn *exec) { if (!execute("ifconfig down %iface%", ifd, exec)) { return 0; } return 1; } static int ppp_up(interface_defn *ifd, execfn *exec) { if (!execute("pon [[%provider%]]", ifd, exec)) { return 0; } return 1; } static int ppp_down(interface_defn *ifd, execfn *exec) { if (!execute("poff [[%provider%]]", ifd, exec)) { return 0; } return 1; } static int wvdial_up(interface_defn *ifd, execfn *exec) { if (!execute("/sbin/start-stop-daemon --start -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)) { return 0; } return 1; } static int wvdial_down(interface_defn *ifd, execfn *exec) { if (!execute ("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial -p /var/run/wvdial.%iface% -s 2", ifd, exec)) { return 0; } return 1; } static method methods[] = { { "wvdial", wvdial_up, wvdial_down, }, { "ppp", ppp_up, ppp_down, }, { "static", static_up, static_down, }, { "bootp", bootp_up, bootp_down, }, { "dhcp", dhcp_up, dhcp_down, }, { "loopback", loopback_up, loopback_down, }, }; address_family addr_inet = { "inet", sizeof(methods) / sizeof(struct method), methods }; #endif /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */ static char *next_word(char *buf, char *word, int maxlen) { if (!buf) return NULL; if (!*buf) return NULL; while (!isspace(*buf) && *buf) { if (maxlen-- > 1) *word++ = *buf; buf++; } if (maxlen > 0) { *word = '\0'; } while (isspace(*buf) && *buf) { buf++; } return buf; } static address_family *get_address_family(address_family *af[], char *name) { int i; for (i = 0; af[i]; i++) { if (strcmp(af[i]->name, name) == 0) { return af[i]; } } return NULL; } static method *get_method(address_family *af, char *name) { int i; for (i = 0; i < af->n_methods; i++) { if (strcmp(af->method[i].name, name) == 0) { return &af->method[i]; } } return(NULL); } static int duplicate_if(interface_defn *ifa, interface_defn *ifb) { if (strcmp(ifa->iface, ifb->iface) != 0) { return(0); } if (ifa->address_family != ifb->address_family) { return(0); } return(1); } static int get_line(char **result, size_t * result_len, FILE * f, int *line) { size_t pos; do { pos = 0; do { if (*result_len - pos < 10) { char *newstr = xrealloc(*result, *result_len * 2 + 80); *result = newstr; *result_len = *result_len * 2 + 80; } if (!fgets(*result + pos, *result_len - pos, f)) { if (ferror(f) == 0 && pos == 0) return 0; if (ferror(f) != 0) return 0; } pos += xstrlen(*result + pos); } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n'); if (pos != 0 && (*result)[pos - 1] == '\n') { (*result)[--pos] = '\0'; } (*line)++; { int first = 0; while (isspace((*result)[first]) && (*result)[first]) { first++; } memmove(*result, *result + first, pos - first + 1); pos -= first; } } while ((*result)[0] == '#'); while ((*result)[pos - 1] == '\\') { (*result)[--pos] = '\0'; do { if (*result_len - pos < 10) { char *newstr = xrealloc(*result, *result_len * 2 + 80); *result = newstr; *result_len = *result_len * 2 + 80; } if (!fgets(*result + pos, *result_len - pos, f)) { if (ferror(f) == 0 && pos == 0) return 0; if (ferror(f) != 0) return 0; } pos += xstrlen(*result + pos); } while (pos == *result_len - 1 && (*result)[pos - 1] != '\n'); if (pos != 0 && (*result)[pos - 1] == '\n') { (*result)[--pos] = '\0'; } (*line)++; } while (isspace((*result)[pos - 1])) { /* remove trailing whitespace */ pos--; } (*result)[pos] = '\0'; return 1; } static interfaces_file *read_interfaces(char *filename) { interface_defn *currif = NULL; interfaces_file *defn; #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING mapping_defn *currmap = NULL; #endif FILE *f; char firstword[80]; char *buf = NULL; char *rest; int line; size_t buf_len = 0; enum { NONE, IFACE, MAPPING } currently_processing = NONE; defn = xmalloc(sizeof(interfaces_file)); defn->max_autointerfaces = defn->n_autointerfaces = 0; defn->autointerfaces = NULL; #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING defn->mappings = NULL; #endif defn->ifaces = NULL; f = fopen(filename, "r"); if (f == NULL) { return NULL; } line = 0; while (get_line(&buf, &buf_len, f, &line)) { rest = next_word(buf, firstword, 80); if (rest == NULL) { continue; /* blank line */ } if (strcmp(firstword, "mapping") == 0) { #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING currmap = xmalloc(sizeof(mapping_defn)); currmap->max_matches = 0; currmap->n_matches = 0; currmap->match = NULL; while ((rest = next_word(rest, firstword, 80))) { 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; { mapping_defn **where = &defn->mappings; while (*where != NULL) { where = &(*where)->next; } *where = currmap; currmap->next = NULL; } currently_processing = MAPPING; #endif } else if (strcmp(firstword, "iface") == 0) { { char iface_name[80]; char address_family_name[80]; char method_name[80]; address_family *addr_fams[] = { #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 &addr_inet, #endif #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6 &addr_inet6, #endif #ifdef CONFIG_FEATURE_IFUPDOWN_IPX &addr_ipx, #endif NULL }; currif = xmalloc(sizeof(interface_defn)); rest = next_word(rest, iface_name, 80); rest = next_word(rest, address_family_name, 80); rest = next_word(rest, method_name, 80); if (rest == NULL) { error_msg("%s:%d: too few parameters for iface line", filename, line); return NULL; } if (rest[0] != '\0') { error_msg("%s:%d: too many parameters for iface line", filename, line); return NULL; } currif->iface = xstrdup(iface_name); currif->address_family = get_address_family(addr_fams, address_family_name); if (!currif->address_family) { error_msg("%s:%d: unknown address type", filename, line); return NULL; } currif->method = get_method(currif->address_family, method_name); if (!currif->method) { error_msg("%s:%d: unknown method", filename, line); return NULL; } currif->automatic = 1; currif->max_options = 0; currif->n_options = 0; currif->option = NULL; { interface_defn **where = &defn->ifaces; while (*where != NULL) { if (duplicate_if(*where, currif)) { error_msg("%s:%d: duplicate interface", filename, line); return NULL; } where = &(*where)->next; } *where = currif; currif->next = NULL; } } currently_processing = IFACE; } else if (strcmp(firstword, "auto") == 0) { while ((rest = next_word(rest, firstword, 80))) { int i; for (i = 0; i < defn->n_autointerfaces; i++) { if (strcmp(firstword, defn->autointerfaces[i]) == 0) { perror_msg("%s:%d: interface declared auto twice", filename, line); return NULL; } } if (defn->n_autointerfaces == defn->max_autointerfaces) { char **tmp; defn->max_autointerfaces *= 2; defn->max_autointerfaces++; tmp = xrealloc(defn->autointerfaces, sizeof(*tmp) * defn->max_autointerfaces); defn->autointerfaces = tmp; } defn->autointerfaces[defn->n_autointerfaces] = xstrdup(firstword); defn->n_autointerfaces++; } currently_processing = NONE; } else { switch (currently_processing) { case IFACE: { int i; if (xstrlen(rest) == 0) { error_msg("%s:%d: option with empty value", filename, line); 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) { error_msg("%s:%d: duplicate option", filename, line); return NULL; } } } } if (currif->n_options >= currif->max_options) { variable *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(rest); if (!currif->option[currif->n_options].name) { perror(filename); return NULL; } if (!currif->option[currif->n_options].value) { perror(filename); return NULL; } currif->n_options++; break; case MAPPING: #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING if (strcmp(firstword, "script") == 0) { if (currmap->script != NULL) { error_msg("%s:%d: duplicate script in mapping", filename, line); return NULL; } else { currmap->script = xstrdup(rest); } } 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(rest); currmap->n_mappings++; } else { error_msg("%s:%d: misplaced option", filename, line); return NULL; } #endif break; case NONE: default: error_msg("%s:%d: misplaced option", filename, line); return NULL; } } } if (ferror(f) != 0) { perror_msg("%s", filename); return NULL; } fclose(f); line = -1; return defn; } static int check(char *str) { return (str != NULL); } static char *setlocalenv(char *format, char *name, char *value) { char *result; char *here; char *there; result = xmalloc(xstrlen(format) + xstrlen(name) + xstrlen(value) + 1); sprintf(result, 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, xstrlen(there) + 1); return result; } static void set_environ(interface_defn *iface, char *mode) { char **environend; int i; const int n_env_entries = iface->n_options + 5; char **ppch; if (environ != NULL) { for (ppch = environ; *ppch; ppch++) { free(*ppch); *ppch = NULL; } free(environ); environ = NULL; } environ = xmalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ )); environend = environ; *environend = NULL; 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 = NULL; } *(environend++) = setlocalenv("%s=%s", "IFACE", iface->iface); *environend = NULL; *(environend++) = setlocalenv("%s=%s", "ADDRFAM", iface->address_family->name); *environend = NULL; *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name); *environend = NULL; *(environend++) = setlocalenv("%s=%s", "MODE", mode); *environend = NULL; *(environend++) = setlocalenv("%s=%s", "PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"); *environend = NULL; } static int doit(char *str) { if (verbose || no_act) { error_msg("%s", str); } if (!no_act) { pid_t child; int status; fflush(NULL); switch (child = fork()) { case -1: /* failure */ return 0; case 0: /* child */ execle("/bin/sh", "/bin/sh", "-c", str, NULL, environ); exit(127); default: /* parent */ } waitpid(child, &status, 0); if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { return 0; } } return (1); } static int execute_all(interface_defn *ifd, execfn *exec, const char *opt) { int i; char *buf; for (i = 0; i < ifd->n_options; i++) { if (strcmp(ifd->option[i].name, opt) == 0) { if (!(*exec) (ifd->option[i].value)) { return 0; } } } buf = xmalloc(xstrlen(opt) + 19); sprintf(buf, "/etc/network/if-%s.d", opt); run_parts(&buf, 0); free(buf); return (1); } static int iface_up(interface_defn *iface) { if (!iface->method->up(iface, check)) { return (-1); } set_environ(iface, "start"); if (!execute_all(iface, doit, "pre-up")) { return (0); } if (!iface->method->up(iface, doit)) { return (0); } if (!execute_all(iface, doit, "up")) { return (0); } return (1); } static int iface_down(interface_defn *iface) { if (!iface->method->down(iface, check)) { return (-1); } set_environ(iface, "stop"); if (!execute_all(iface, doit, "down")) { return (0); } if (!iface->method->down(iface, doit)) { return (0); } if (!execute_all(iface, doit, "post-down")) { return (0); } return (1); } #ifdef CONFIG_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]); 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 int run_mapping(char *physical, char *logical, int len, mapping_defn * map) { FILE *in, *out; int i, status; pid_t pid; pid = popen2(&in, &out, map->script, physical, NULL); if (pid == 0) { return 0; } 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 (fgets(logical, len, out)) { char *pch = logical + xstrlen(logical) - 1; while (pch >= logical && isspace(*pch)) *(pch--) = '\0'; } } fclose(out); return 1; } #endif /* CONFIG_FEATURE_IFUPDOWN_MAPPING */ static int lookfor_iface(char **ifaces, int n_ifaces, char *iface) { int i; for (i = 0; i < n_ifaces; i++) { if (strncmp(iface, ifaces[i], xstrlen(iface)) == 0) { if (ifaces[i][xstrlen(iface)] == '=') { return i; } } } return(-1); } static void add_to_state(char ***ifaces, int *n_ifaces, int *max_ifaces, char *new_iface) { if (*max_ifaces == *n_ifaces) { *max_ifaces = (*max_ifaces * 2) + 1; *ifaces = xrealloc(*ifaces, sizeof(**ifaces) * *max_ifaces); } (*ifaces)[(*n_ifaces)++] = new_iface; } extern int ifupdown_main(int argc, char **argv) { int (*cmds) (interface_defn *) = NULL; interfaces_file *defn; FILE *state_fp = NULL; char **target_iface = NULL; char **state = NULL; /* list of iface=liface */ char *interfaces = "/etc/network/interfaces"; char *statefile = "/etc/network/ifstate"; int do_all = 0; #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING int run_mappings = 1; #endif int force = 0; int n_target_ifaces = 0; int n_state = 0; int max_state = 0; int i; if (applet_name[2] == 'u') { /* ifup command */ cmds = iface_up; } else { /* ifdown command */ cmds = iface_down; } while ((i = getopt(argc, argv, "i:hvnamf")) != -1) { switch (i) { case 'i': /* interfaces */ interfaces = xstrdup(optarg); break; case 'v': /* verbose */ verbose = 1; break; case 'a': /* all */ do_all = 1; break; case 'n': /* no-act */ no_act = 1; break; #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING case 'm': /* no-mappings */ run_mappings = 0; break; #endif case 'f': /* force */ force = 1; break; default: show_usage(); break; } } if (argc - optind > 0) { if (do_all) { show_usage(); } } else { if (!do_all) { show_usage(); } } defn = read_interfaces(interfaces); if (!defn) { error_msg_and_die("couldn't read interfaces file \"%s\"", interfaces); } state_fp = fopen(statefile, no_act ? "r" : "a+"); if (state_fp == NULL && !no_act) { perror_msg_and_die("failed to open statefile %s", statefile); } if (state_fp != NULL) { char buf[80]; char *p; if (!no_act) { int flags; struct flock lock; const int state_fd = fileno(state_fp); flags = fcntl(state_fd, F_GETFD); if ((flags < 0) || (fcntl(state_fd, F_SETFD, flags | FD_CLOEXEC) < 0)) { perror_msg_and_die("failed to set FD_CLOEXEC on statefile %s", statefile); } lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; lock.l_start = 0; lock.l_len = 0; if (fcntl(state_fd, F_SETLKW, &lock) < 0) { perror_msg_and_die("failed to lock statefile %s", statefile); } } rewind(state_fp); while ((p = fgets(buf, sizeof buf, state_fp)) != NULL) { char *pch; pch = buf + xstrlen(buf) - 1; while (pch > buf && isspace(*pch)) { pch--; } *(pch + 1) = '\0'; pch = buf; while (isspace(*pch)) { pch++; } add_to_state(&state, &n_state, &max_state, xstrdup(pch)); } } if (do_all) { if (cmds == iface_up) { target_iface = defn->autointerfaces; n_target_ifaces = defn->n_autointerfaces; } else if (cmds == iface_down) { target_iface = state; n_target_ifaces = n_state; } } else { target_iface = argv + optind; n_target_ifaces = argc - optind; } for (i = 0; i < n_target_ifaces; i++) { interface_defn *currif; char iface[80]; char liface[80]; char *pch; int okay = 0; strncpy(iface, target_iface[i], sizeof(iface)); iface[sizeof(iface) - 1] = '\0'; if ((pch = strchr(iface, '='))) { *pch = '\0'; strncpy(liface, pch + 1, sizeof(liface)); liface[sizeof(liface) - 1] = '\0'; } else { strncpy(liface, iface, sizeof(liface)); liface[sizeof(liface) - 1] = '\0'; } if (!force) { int already_up = lookfor_iface(state, n_state, iface);; if (cmds == iface_up) { /* ifup */ if (already_up != -1) { error_msg("interface %s already configured", iface); continue; } } else { /* ifdown */ if (already_up == -1) { error_msg("interface %s not configured", iface); continue; } strncpy(liface, strchr(state[already_up], '=') + 1, 80); liface[79] = 0; } } #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING if ((cmds == iface_up) && run_mappings) { mapping_defn *currmap; for (currmap = defn->mappings; currmap; currmap = currmap->next) { for (i = 0; i < currmap->n_matches; i++) { if (fnmatch(currmap->match[i], liface, 0) != 0) continue; if (verbose) { error_msg("Running mapping script %s on %s", currmap->script, liface); } run_mapping(iface, liface, sizeof(liface), currmap); break; } } } #endif for (currif = defn->ifaces; currif; currif = currif->next) { if (strcmp(liface, currif->iface) == 0) { char *oldiface = currif->iface; okay = 1; currif->iface = iface; if (verbose) { error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name); } switch (cmds(currif)) { case -1: printf ("Don't seem to be have all the variables for %s/%s.\n", liface, currif->address_family->name); break; case 0: /* this wasn't entirely successful, should it be added to * the state file? */ case 1: /* successful */ } currif->iface = oldiface; } } if (!okay && !force) { error_msg("Ignoring unknown interface %s=%s.", iface, liface); } else { int already_up = lookfor_iface(state, n_state, iface); if (cmds == iface_up) { char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1); sprintf(newiface, "%s=%s", iface, liface); if (already_up == -1) { add_to_state(&state, &n_state, &max_state, newiface); } else { free(state[already_up]); state[already_up] = newiface; } } else if (cmds == iface_down) { if (already_up != -1) { state[already_up] = state[--n_state]; } } } if (state_fp != NULL && !no_act) { if (ftruncate(fileno(state_fp), 0) < 0) { error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno)); } rewind(state_fp); for (i = 0; i < n_state; i++) { fputs(state[i], state_fp); fputc('\n', state_fp); } fflush(state_fp); } } if (state_fp != NULL) { fclose(state_fp); state_fp = NULL; } return 0; }