+/* vi: set sw=4 ts=4: */
/* script.c
*
* 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 "dhcpc.h"
#include "common.h"
+#include "dhcpc.h"
+#include "options.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 "),
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, char *pre, uint8_t *ip)
+/* note: ip is a pointer to an IP in network order, possibly misaliged */
+static int sprint_nip(char *dest, const char *pre, const uint8_t *ip)
{
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, uint8_t *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;
+ int len, type, optlen;
uint16_t val_u16;
int16_t val_s16;
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 += sprint_nip(dest, "", option);
+ *dest++ = '/';
option += 4;
optlen = 4;
case OPTION_IP: /* Works regardless of host byte order. */
- dest += sprintip(dest, "", option);
- break;
+ dest += sprint_nip(dest, "", option);
+ break;
case OPTION_BOOLEAN:
dest += sprintf(dest, *option ? "yes" : "no");
break;
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;
}
-/* put all the paramaters into an environment */
-static char **fill_envp(struct dhcpMessage *packet)
+/* put all the parameters into an environment */
+static char **fill_envp(struct dhcp_packet *packet)
{
int num_options = 0;
- int i, j;
- char **envp;
+ int i;
+ char **envp, **curr;
+ const char *opt_name;
uint8_t *temp;
- struct in_addr subnet;
- char over = 0;
+ uint8_t over = 0;
- if (packet == NULL)
- num_options = 0;
- else {
- for (i = 0; dhcp_options[i].code; i++)
+ if (packet) {
+ for (i = 0; dhcp_options[i].code; i++) {
if (get_option(packet, dhcp_options[i].code)) {
num_options++;
if (dhcp_options[i].code == DHCP_SUBNET)
num_options++; /* for mton */
}
- if (packet->siaddr) num_options++;
- if ((temp = get_option(packet, DHCP_OPTION_OVER)))
+ }
+ if (packet->siaddr_nip)
+ 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++;
+ if (!(over & FILE_FIELD) && packet->file[0])
+ num_options++;
+ if (!(over & SNAME_FIELD) && packet->sname[0])
+ num_options++;
}
- envp = xcalloc(sizeof(char *), num_options + 5);
- j = 0;
- asprintf(&envp[j++], "interface=%s", client_config.interface);
- asprintf(&envp[j++], "%s=%s", "PATH",
- getenv("PATH") ? : "/bin:/usr/bin:/sbin:/usr/sbin");
- asprintf(&envp[j++], "%s=%s", "HOME", getenv("HOME") ? : "/");
+ curr = envp = xzalloc(sizeof(char *) * (num_options + 3));
+ *curr = xasprintf("interface=%s", client_config.interface);
+ putenv(*curr++);
- if (packet == NULL) return envp;
-
- envp[j] = xmalloc(sizeof("ip=255.255.255.255"));
- sprintip(envp[j++], "ip=", (uint8_t *) &packet->yiaddr);
+ if (packet == NULL)
+ return envp;
+ *curr = xmalloc(sizeof("ip=255.255.255.255"));
+ sprint_nip(*curr, "ip=", (uint8_t *) &packet->yiaddr);
+ putenv(*curr++);
- for (i = 0; dhcp_options[i].code; i++) {
- if (!(temp = get_option(packet, dhcp_options[i].code)))
- continue;
- envp[j] = xmalloc(upper_length(temp[OPT_LEN - 2],
- dhcp_options[i].flags & TYPE_MASK) + strlen(dhcp_options[i].name) + 2);
- fill_options(envp[j++], temp, &dhcp_options[i]);
+ 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 (dhcp_options[i].code == DHCP_SUBNET) {
- memcpy(&subnet, temp, 4);
- asprintf(&envp[j++], "mask=%d", mton(&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) {
- envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));
- sprintip(envp[j++], "siaddr=", (uint8_t *) &packet->siaddr);
+ if (packet->siaddr_nip) {
+ *curr = xmalloc(sizeof("siaddr=255.255.255.255"));
+ sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip);
+ 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);
+ *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 dhcp_packet *packet, const char *name)
{
- int pid;
- char **envp;
+ char **envp, **curr;
+ char *argv[3];
if (client_config.script == NULL)
return;
- DEBUG(LOG_INFO, "vforking and execle'ing %s", client_config.script);
+ envp = fill_envp(packet);
/* call script */
- pid = vfork();
- if (pid) {
- waitpid(pid, NULL, 0);
- return;
- } else if (pid == 0) {
- envp = fill_envp(packet);
-
- /* close fd's? */
-
- /* exec script */
- execle(client_config.script, client_config.script,
- name, NULL, envp);
- LOG(LOG_ERR, "script %s failed: %m", client_config.script);
- exit(1);
+ log1("Executing %s", client_config.script);
+ argv[0] = (char*) client_config.script;
+ argv[1] = (char*) name;
+ argv[2] = NULL;
+ wait4pid(spawn(argv));
+
+ for (curr = envp; *curr; curr++) {
+ log2(" %s", *curr);
+ bb_unsetenv(*curr);
+ free(*curr);
}
+ free(envp);
}
projects / oweals / busybox.git / blobdiff