diff options
Diffstat (limited to 'release/src/router/busybox/networking/udhcp/script.c')
-rw-r--r-- | release/src/router/busybox/networking/udhcp/script.c | 256 |
1 files changed, 124 insertions, 132 deletions
diff --git a/release/src/router/busybox/networking/udhcp/script.c b/release/src/router/busybox/networking/udhcp/script.c index 41b680d6..3029b136 100644 --- a/release/src/router/busybox/networking/udhcp/script.c +++ b/release/src/router/busybox/networking/udhcp/script.c @@ -1,45 +1,26 @@ +/* vi: set sw=4 ts=4: */ /* script.c * - * Functions to call the DHCP client notification scripts + * Functions to call the DHCP client notification scripts * * Russ Dill <Russ.Dill@asu.edu> July 2001 * - * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ -#include <string.h> -#include <unistd.h> -#include <stdio.h> -#include <stdlib.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <arpa/inet.h> -#include <sys/types.h> -#include <sys/wait.h> - -#include "options.h" -#include "dhcpd.h" +#include "common.h" #include "dhcpc.h" #include "options.h" -#include "common.h" + /* get a rough idea of how long an option will be (rounding up...) */ -static const int max_option_length[] = { +static const uint8_t max_option_length[] = { [OPTION_IP] = sizeof("255.255.255.255 "), [OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2, [OPTION_STRING] = 1, +#if ENABLE_FEATURE_UDHCP_RFC3397 + [OPTION_STR1035] = 1, +#endif [OPTION_BOOLEAN] = sizeof("yes "), [OPTION_U8] = sizeof("255 "), [OPTION_U16] = sizeof("65535 "), @@ -52,57 +33,56 @@ static const int max_option_length[] = { static inline int upper_length(int length, int opt_index) { return max_option_length[opt_index] * - (length / option_lengths[opt_index]); + (length / dhcp_option_lengths[opt_index]); } -static int sprintip(char *dest, unsigned char *ip) -{ - return sprintf(dest, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]); -} - -static void asprintip(char **dest, char *pre, unsigned char *ip) +static int sprintip(char *dest, const char *pre, const uint8_t *ip) { - asprintf(dest, "%s%d.%d.%d.%d", pre, ip[0], ip[1], ip[2], ip[3]); + return sprintf(dest, "%s%d.%d.%d.%d", pre, ip[0], ip[1], ip[2], ip[3]); } /* really simple implementation, just count the bits */ -static int mton(struct in_addr *mask) +static int mton(uint32_t mask) { - int i; - unsigned long bits = ntohl(mask->s_addr); - /* too bad one can't check the carry bit, etc in c bit - * shifting */ - for (i = 0; i < 32 && !((bits >> i) & 1); i++); - return 32 - i; + int i = 0; + mask = ntohl(mask); /* 111110000-like bit pattern */ + while (mask) { + i++; + mask <<= 1; + } + return i; } -/* Fill dest with the text of option 'option'. */ -static void fill_options(char *dest, unsigned char *option, struct dhcp_option *type_p) +/* Allocate and fill with the text of option 'option'. */ +static char *alloc_fill_opts(uint8_t *option, const struct dhcp_option *type_p, const char *opt_name) { - int type, optlen; - u_int16_t val_u16; + int len, type, optlen; + uint16_t val_u16; int16_t val_s16; - u_int32_t val_u32; + uint32_t val_u32; int32_t val_s32; - int len = option[OPT_LEN - 2]; - - dest += sprintf(dest, "%s=", type_p->name); + char *dest, *ret; + len = option[OPT_LEN - 2]; type = type_p->flags & TYPE_MASK; - optlen = option_lengths[type]; - for(;;) { + optlen = dhcp_option_lengths[type]; + + dest = ret = xmalloc(upper_length(len, type) + strlen(opt_name) + 2); + dest += sprintf(ret, "%s=", opt_name); + + for (;;) { switch (type) { case OPTION_IP_PAIR: - dest += sprintip(dest, option); - *(dest++) = '/'; + dest += sprintip(dest, "", option); + *dest++ = '/'; option += 4; optlen = 4; case OPTION_IP: /* Works regardless of host byte order. */ - dest += sprintip(dest, option); - break; + dest += sprintip(dest, "", option); + break; case OPTION_BOOLEAN: dest += sprintf(dest, *option ? "yes" : "no"); break; @@ -110,134 +90,146 @@ static void fill_options(char *dest, unsigned char *option, struct dhcp_option * dest += sprintf(dest, "%u", *option); break; case OPTION_U16: - memcpy(&val_u16, option, 2); + move_from_unaligned16(val_u16, option); dest += sprintf(dest, "%u", ntohs(val_u16)); break; case OPTION_S16: - memcpy(&val_s16, option, 2); + move_from_unaligned16(val_s16, option); dest += sprintf(dest, "%d", ntohs(val_s16)); break; case OPTION_U32: - memcpy(&val_u32, option, 4); + move_from_unaligned32(val_u32, option); dest += sprintf(dest, "%lu", (unsigned long) ntohl(val_u32)); break; case OPTION_S32: - memcpy(&val_s32, option, 4); + move_from_unaligned32(val_s32, option); dest += sprintf(dest, "%ld", (long) ntohl(val_s32)); break; case OPTION_STRING: memcpy(dest, option, len); dest[len] = '\0'; - return; /* Short circuit this case */ + return ret; /* Short circuit this case */ +#if ENABLE_FEATURE_UDHCP_RFC3397 + case OPTION_STR1035: + /* unpack option into dest; use ret for prefix (i.e., "optname=") */ + dest = dname_dec(option, len, ret); + free(ret); + return dest; +#endif } option += optlen; len -= optlen; - if (len <= 0) break; + if (len <= 0) + break; dest += sprintf(dest, " "); } + return ret; } -static char *find_env(const char *prefix, char *defaultstr) -{ - char *ptr; - - ptr = getenv(prefix); - return ptr ? ptr : defaultstr; -} - - -/* put all the paramaters into an environment */ +/* put all the parameters into an environment */ static char **fill_envp(struct dhcpMessage *packet) { int num_options = 0; - int i, j; - char **envp; - unsigned char *temp; - struct in_addr subnet; - char over = 0; - - if (packet == NULL) - num_options = 0; - else { - for (i = 0; options[i].code; i++) - if (get_option(packet, options[i].code)) + int i; + char **envp, **curr; + const char *opt_name; + uint8_t *temp; + uint8_t over = 0; + + if (packet) { + for (i = 0; dhcp_options[i].code; i++) { + if (get_option(packet, dhcp_options[i].code)) { num_options++; - if (packet->siaddr) num_options++; - if ((temp = get_option(packet, DHCP_OPTION_OVER))) + if (dhcp_options[i].code == DHCP_SUBNET) + num_options++; /* for mton */ + } + } + if (packet->siaddr) + num_options++; + temp = get_option(packet, DHCP_OPTION_OVERLOAD); + if (temp) over = *temp; - if (!(over & FILE_FIELD) && packet->file[0]) num_options++; - if (!(over & SNAME_FIELD) && packet->sname[0]) num_options++; - } - - envp = xmalloc((num_options + 5) * sizeof(char *)); - j = 0; - asprintf(&envp[j++], "interface=%s", client_config.interface); - envp[j++] = find_env("PATH", "PATH=/bin:/usr/bin:/sbin:/usr/sbin"); - envp[j++] = find_env("HOME", "HOME=/"); - - if (packet == NULL) { - envp[j++] = NULL; - return envp; + if (!(over & FILE_FIELD) && packet->file[0]) + num_options++; + if (!(over & SNAME_FIELD) && packet->sname[0]) + num_options++; } - asprintip(&envp[j++], "ip=", (unsigned char *) &packet->yiaddr); + curr = envp = xzalloc(sizeof(char *) * (num_options + 3)); + *curr = xasprintf("interface=%s", client_config.interface); + putenv(*curr++); + if (packet == NULL) + return envp; - for (i = 0; options[i].code; i++) { - if (!(temp = get_option(packet, options[i].code))) - continue; - envp[j] = xmalloc(upper_length(temp[OPT_LEN - 2], options[i].flags & TYPE_MASK) + strlen(options[i].name) + 2); - fill_options(envp[j++], temp, &options[i]); + *curr = xmalloc(sizeof("ip=255.255.255.255")); + sprintip(*curr, "ip=", (uint8_t *) &packet->yiaddr); + putenv(*curr++); + + opt_name = dhcp_option_strings; + i = 0; + while (*opt_name) { + temp = get_option(packet, dhcp_options[i].code); + if (!temp) + goto next; + *curr = alloc_fill_opts(temp, &dhcp_options[i], opt_name); + putenv(*curr++); /* Fill in a subnet bits option for things like /24 */ - if (options[i].code == DHCP_SUBNET) { - memcpy(&subnet, temp, 4); - asprintf(&envp[j++], "mask=%d", mton(&subnet)); + if (dhcp_options[i].code == DHCP_SUBNET) { + uint32_t subnet; + move_from_unaligned32(subnet, temp); + *curr = xasprintf("mask=%d", mton(subnet)); + putenv(*curr++); } + next: + opt_name += strlen(opt_name) + 1; + i++; } if (packet->siaddr) { - asprintip(&envp[j++], "siaddr=", (unsigned char *) &packet->siaddr); + *curr = xmalloc(sizeof("siaddr=255.255.255.255")); + sprintip(*curr, "siaddr=", (uint8_t *) &packet->siaddr); + putenv(*curr++); } if (!(over & FILE_FIELD) && packet->file[0]) { /* watch out for invalid packets */ packet->file[sizeof(packet->file) - 1] = '\0'; - asprintf(&envp[j++], "boot_file=%s", packet->file); + *curr = xasprintf("boot_file=%s", packet->file); + putenv(*curr++); } if (!(over & SNAME_FIELD) && packet->sname[0]) { /* watch out for invalid packets */ packet->sname[sizeof(packet->sname) - 1] = '\0'; - asprintf(&envp[j++], "sname=%s", packet->sname); - } - envp[j] = NULL; + *curr = xasprintf("sname=%s", packet->sname); + putenv(*curr++); + } return envp; } /* Call a script with a par file and env vars */ -void run_script(struct dhcpMessage *packet, const char *name) +void FAST_FUNC udhcp_run_script(struct dhcpMessage *packet, const char *name) { - int pid; - char **envp; + char **envp, **curr; + char *argv[3]; if (client_config.script == NULL) return; + DEBUG("vfork'ing and exec'ing %s", client_config.script); + + envp = fill_envp(packet); + /* call script */ - pid = fork(); - if (pid) { - waitpid(pid, NULL, 0); - return; - } else if (pid == 0) { - envp = fill_envp(packet); - - /* close fd's? */ - - /* exec script */ - DEBUG(LOG_INFO, "execle'ing %s", client_config.script); - execle(client_config.script, client_config.script, - name, NULL, envp); - LOG(LOG_ERR, "script %s failed: %m", client_config.script); - exit(1); - } + argv[0] = (char*) client_config.script; + argv[1] = (char*) name; + argv[2] = NULL; + wait4pid(spawn(argv)); + + for (curr = envp; *curr; curr++) { + bb_unsetenv(*curr); + free(*curr); + } + free(envp); } |