| /* vi: set sw=4 ts=4: */ |
| /* |
| * ifupdown for busybox |
| * Copyright (c) 2002 Glenn McGrath <bug1@iinet.net.au> |
| * Copyright (c) 2003-2004 Erik Andersen <andersen@codepoet.org> |
| * |
| * Based on ifupdown v 0.6.4 by Anthony Towns |
| * Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au> |
| * |
| * 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. |
| */ |
| |
| /* TODO: standardise execute() return codes to return 0 for success and 1 for failure */ |
| |
| #include <sys/stat.h> |
| #include <sys/utsname.h> |
| #include <sys/wait.h> |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <fnmatch.h> |
| #include <getopt.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "busybox.h" |
| |
| #define MAX_OPT_DEPTH 10 |
| #define EUNBALBRACK 10001 |
| #define EUNDEFVAR 10002 |
| #define EUNBALPER 10000 |
| |
| #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING |
| #define MAX_INTERFACE_LENGTH 10 |
| #endif |
| |
| #if 0 |
| #define debug_noise(fmt, args...) printf(fmt, ## args) |
| #else |
| #define debug_noise(fmt, args...) |
| #endif |
| |
| /* Forward declaration */ |
| struct interface_defn_t; |
| |
| typedef int (execfn)(char *command); |
| |
| struct method_t |
| { |
| char *name; |
| int (*up)(struct interface_defn_t *ifd, execfn *e); |
| int (*down)(struct interface_defn_t *ifd, execfn *e); |
| }; |
| |
| struct address_family_t |
| { |
| char *name; |
| int n_methods; |
| 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 |
| { |
| struct address_family_t *address_family; |
| 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; |
| }; |
| |
| static char no_act = 0; |
| static char verbose = 0; |
| static char **__myenviron = NULL; |
| |
| #ifdef CONFIG_FEATURE_IFUPDOWN_IP |
| |
| static unsigned int count_bits(unsigned int a) |
| { |
| unsigned int 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 int 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; |
| result = count_bits(a); |
| result += count_bits(b); |
| result += count_bits(c); |
| result += count_bits(d); |
| return ((int)result); |
| } |
| #endif |
| |
| #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6 |
| 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, struct interface_defn_t *ifd) |
| { |
| int i; |
| |
| if (strncmpz(id, "iface", idlen) == 0) { |
| char *result; |
| static char label_buf[20]; |
| strncpy(label_buf, ifd->iface, 19); |
| label_buf[19]=0; |
| result = strchr(label_buf, ':'); |
| if (result) { |
| *result=0; |
| } |
| return( label_buf); |
| } else if (strncmpz(id, "label", 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, struct interface_defn_t *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, strlen(varvalue)); |
| } else { |
| #ifdef CONFIG_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) { |
| int res; |
| varvalue = get_var("netmask", 7, ifd); |
| if (varvalue && (res=count_netmask_bits(varvalue)) > 0) { |
| char argument[255]; |
| sprintf(argument, "%d", res); |
| addstr(&result, &len, &pos, 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); |
| } |
| |
| static int execute(char *command, struct interface_defn_t *ifd, execfn *exec) |
| { |
| char *out; |
| int ret; |
| |
| out = parse(command, ifd); |
| if (!out) { |
| return(0); |
| } |
| ret = (*exec) (out); |
| |
| free(out); |
| if (ret != 1) { |
| return(0); |
| } |
| return(1); |
| } |
| #endif |
| |
| #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6 |
| static int loopback_up6(struct interface_defn_t *ifd, execfn *exec) |
| { |
| #ifdef CONFIG_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) |
| { |
| #ifdef CONFIG_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; |
| #ifdef CONFIG_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); |
| 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) |
| { |
| #ifdef CONFIG_FEATURE_IFUPDOWN_IP |
| return(execute("ip link set %iface% down", ifd, exec)); |
| #else |
| return(execute("ifconfig %iface% down", ifd, exec)); |
| #endif |
| } |
| |
| #ifdef CONFIG_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 struct method_t methods6[] = { |
| #ifdef CONFIG_FEATURE_IFUPDOWN_IP |
| { "v4tunnel", v4tunnel_up, v4tunnel_down, }, |
| #endif |
| { "static", static_up6, static_down6, }, |
| { "loopback", loopback_up6, loopback_down6, }, |
| }; |
| |
| static struct address_family_t addr_inet6 = { |
| "inet6", |
| sizeof(methods6) / sizeof(struct method_t), |
| methods6 |
| }; |
| #endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */ |
| |
| #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 |
| static int loopback_up(struct interface_defn_t *ifd, execfn *exec) |
| { |
| #ifdef CONFIG_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) |
| { |
| #ifdef CONFIG_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; |
| #ifdef CONFIG_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 |
| result = execute("ifconfig %iface% %address% netmask %netmask% " |
| "[[broadcast %broadcast%]] [[pointopoint %pointopoint%]] " |
| "[[media %media%]] [[mtu %mtu%]] [[hw %hwaddress%]] up", |
| ifd, exec); |
| result += execute("[[ route add default gw %gateway% %iface% ]]", ifd, exec); |
| return ((result == 2) ? 2 : 0); |
| #endif |
| } |
| |
| static int static_down(struct interface_defn_t *ifd, execfn *exec) |
| { |
| int result; |
| #ifdef CONFIG_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); |
| } |
| |
| 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(struct interface_defn_t *ifd, execfn *exec) |
| { |
| if (execable("/sbin/udhcpc")) { |
| return( execute("udhcpc -n -p /var/run/udhcpc.%iface%.pid -i " |
| "%iface% [[-H %hostname%]] [[-c %clientid%]]", ifd, exec)); |
| } else if (execable("/sbin/pump")) { |
| return( execute("pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]]", ifd, exec)); |
| } else if (execable("/sbin/dhclient")) { |
| return( execute("dhclient -pf /var/run/dhclient.%iface%.pid %iface%", ifd, exec)); |
| } else if (execable("/sbin/dhcpcd")) { |
| return( execute("dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %clientid%]] " |
| "[[-l %leasetime%]] %iface%", ifd, exec)); |
| } |
| return(0); |
| } |
| |
| static int dhcp_down(struct interface_defn_t *ifd, execfn *exec) |
| { |
| int result = 0; |
| if (execable("/sbin/udhcpc")) { |
| /* SIGUSR2 forces udhcpc to release the current lease and go inactive, |
| * and SIGTERM causes udhcpc to exit. Signals are queued and processed |
| * sequentially so we don't need to sleep */ |
| result = execute("kill -USR2 `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec); |
| result += execute("kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec); |
| } else if (execable("/sbin/pump")) { |
| result = execute("pump -i %iface% -k", ifd, exec); |
| } else if (execable("/sbin/dhclient")) { |
| result = execute("kill -9 `cat /var/run/dhclient.%iface%.pid` 2>/dev/null", ifd, exec); |
| } else if (execable("/sbin/dhcpcd")) { |
| result = execute("dhcpcd -k %iface%", ifd, exec); |
| } |
| return (result || static_down(ifd, exec)); |
| } |
| |
| 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("/sbin/start-stop-daemon --start -x /usr/bin/wvdial " |
| "-p /var/run/wvdial.%iface% -b -m -- [[ %provider% ]]", ifd, exec)); |
| } |
| |
| static int wvdial_down(struct interface_defn_t *ifd, execfn *exec) |
| { |
| return( execute("/sbin/start-stop-daemon --stop -x /usr/bin/wvdial " |
| "-p /var/run/wvdial.%iface% -s 2", ifd, exec)); |
| } |
| |
| static struct method_t methods[] = |
| { |
| { "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 struct address_family_t addr_inet = |
| { |
| "inet", |
| sizeof(methods) / sizeof(struct method_t), |
| methods |
| }; |
| |
| #endif /* ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 */ |
| |
| static char *next_word(char **buf) |
| { |
| unsigned short length; |
| char *word; |
| |
| if ((buf == NULL) || (*buf == NULL) || (**buf == '\0')) { |
| return NULL; |
| } |
| |
| /* Skip over leading whitespace */ |
| word = *buf; |
| while (isspace(*word)) { |
| ++word; |
| } |
| |
| /* 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 struct address_family_t *get_address_family(struct address_family_t *af[], char *name) |
| { |
| int i; |
| |
| for (i = 0; af[i]; i++) { |
| if (strcmp(af[i]->name, name) == 0) { |
| return af[i]; |
| } |
| } |
| return NULL; |
| } |
| |
| static struct method_t *get_method(struct address_family_t *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 const llist_t *find_list_string(const llist_t *list, const char *string) |
| { |
| 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) |
| { |
| #ifdef CONFIG_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 = bb_xfopen(filename, "r"); |
| |
| while ((buf = bb_get_chomped_line_from_file(f)) != NULL) { |
| char *buf_ptr = buf; |
| |
| firstword = next_word(&buf_ptr); |
| if (firstword == NULL) { |
| free(buf); |
| continue; /* blank line */ |
| } |
| |
| if (strcmp(firstword, "mapping") == 0) { |
| #ifdef CONFIG_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++] = bb_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) { |
| { |
| char *iface_name; |
| char *address_family_name; |
| char *method_name; |
| struct address_family_t *addr_fams[] = { |
| #ifdef CONFIG_FEATURE_IFUPDOWN_IPV4 |
| &addr_inet, |
| #endif |
| #ifdef CONFIG_FEATURE_IFUPDOWN_IPV6 |
| &addr_inet6, |
| #endif |
| NULL |
| }; |
| |
| 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 */ |
| while (isspace(*buf_ptr)) { |
| ++buf_ptr; |
| } |
| |
| if (buf_ptr[0] != '\0') { |
| bb_error_msg("too many parameters \"%s\"", buf); |
| return NULL; |
| } |
| |
| currif->iface = bb_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; |
| } |
| |
| |
| { |
| llist_t *iface_list; |
| 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), bb_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 = bb_xstrdup(firstword); |
| currif->option[currif->n_options].value = bb_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: |
| #ifdef CONFIG_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 = bb_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] = bb_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(char *format, const char *name, const char *value) |
| { |
| char *result; |
| char *here; |
| char *there; |
| |
| result = bb_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 (__myenviron != NULL) { |
| for (ppch = __myenviron; *ppch; ppch++) { |
| free(*ppch); |
| *ppch = NULL; |
| } |
| free(__myenviron); |
| } |
| __myenviron = xzalloc(sizeof(char *) * (n_env_entries + 1 /* for final NULL */ )); |
| environend = __myenviron; |
| |
| 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", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"); |
| } |
| |
| static int doit(char *str) |
| { |
| if (verbose || no_act) { |
| printf("%s\n", str); |
| } |
| if (!no_act) { |
| pid_t child; |
| int status; |
| |
| fflush(NULL); |
| switch (child = fork()) { |
| case -1: /* failure */ |
| return 0; |
| case 0: /* child */ |
| execle(DEFAULT_SHELL, DEFAULT_SHELL, "-c", str, NULL, __myenviron); |
| 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 = bb_xasprintf("run-parts /etc/network/if-%s.d", opt); |
| if (doit(buf) != 1) { |
| return 0; |
| } |
| return 1; |
| } |
| |
| 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; |
| } |
| |
| #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 char *run_mapping(char *physical, struct mapping_defn_t * map) |
| { |
| FILE *in, *out; |
| int i, status; |
| pid_t pid; |
| |
| char *logical = bb_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 = (char *)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 /* CONFIG_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); |
| } |
| |
| int ifupdown_main(int argc, char **argv) |
| { |
| int (*cmds) (struct interface_defn_t *) = NULL; |
| struct interfaces_file_t *defn; |
| llist_t *state_list = NULL; |
| llist_t *target_list = NULL; |
| const char *interfaces = "/etc/network/interfaces"; |
| const char *statefile = "/var/run/ifstate"; |
| |
| #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING |
| int run_mappings = 1; |
| #endif |
| int do_all = 0; |
| int force = 0; |
| int any_failures = 0; |
| int i; |
| |
| if (bb_applet_name[2] == 'u') { |
| /* ifup command */ |
| cmds = iface_up; |
| } else { |
| /* ifdown command */ |
| cmds = iface_down; |
| } |
| |
| #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING |
| while ((i = getopt(argc, argv, "i:hvnamf")) != -1) |
| #else |
| while ((i = getopt(argc, argv, "i:hvnaf")) != -1) |
| #endif |
| { |
| switch (i) { |
| case 'i': /* interfaces */ |
| interfaces = 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: |
| bb_show_usage(); |
| break; |
| } |
| } |
| |
| 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) { |
| exit(EXIT_FAILURE); |
| } |
| |
| /* Create a list of interfaces to work on */ |
| if (do_all) { |
| if (cmds == iface_up) { |
| target_list = defn->autointerfaces; |
| } else { |
| /* iface_down */ |
| const llist_t *list = state_list; |
| while (list) { |
| llist_add_to_end(&target_list, bb_xstrdup(list->data)); |
| list = list->link; |
| } |
| 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; |
| int okay = 0; |
| int cmds_ret; |
| |
| iface = bb_xstrdup(target_list->data); |
| target_list = target_list->link; |
| |
| pch = strchr(iface, '='); |
| if (pch) { |
| *pch = '\0'; |
| liface = bb_xstrdup(pch + 1); |
| } else { |
| liface = bb_xstrdup(iface); |
| } |
| |
| if (!force) { |
| 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; |
| } |
| } |
| } |
| |
| #ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING |
| if ((cmds == iface_up) && run_mappings) { |
| struct mapping_defn_t *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) { |
| 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) { |
| printf("\n"); |
| } |
| |
| if (!okay && !force) { |
| bb_error_msg("Ignoring unknown interface %s", liface); |
| any_failures += 1; |
| } else { |
| llist_t *iface_state = find_iface_state(state_list, iface); |
| |
| if (cmds == iface_up) { |
| char *newiface = bb_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 the linked list */ |
| free(llist_pop(&iface_state)); |
| } |
| } |
| } |
| |
| /* Actually write the new state */ |
| if (!no_act) { |
| FILE *state_fp = NULL; |
| |
| state_fp = bb_xfopen(statefile, "w"); |
| while (state_list) { |
| if (state_list->data) { |
| fputs(state_list->data, state_fp); |
| fputc('\n', state_fp); |
| } |
| state_list = state_list->link; |
| } |
| fclose(state_fp); |
| } |
| |
| if (any_failures) |
| return 1; |
| return 0; |
| } |