/* 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 <sys/types.h>
#include <sys/wait.h>
+#include "common.h"
#include "options.h"
#include "dhcpd.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 int sprintip(char *dest, unsigned char *ip)
+static int sprintip(char *dest, char *pre, uint8_t *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)
-{
- 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]);
}
/* Fill dest with the text of option 'option'. */
-static void fill_options(char *dest, unsigned char *option, struct dhcp_option *type_p)
+static void fill_options(char *dest, uint8_t *option, struct dhcp_option *type_p)
{
int type, optlen;
- u_int16_t val_u16;
+ 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];
for(;;) {
switch (type) {
case OPTION_IP_PAIR:
- dest += sprintip(dest, option);
+ 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;
}
-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;
+ uint8_t *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))
+ 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)))
over = *temp;
if (!(over & FILE_FIELD) && packet->file[0]) num_options++;
- if (!(over & SNAME_FIELD) && packet->sname[0]) num_options++;
+ if (!(over & SNAME_FIELD) && packet->sname[0]) num_options++;
}
-
- envp = xmalloc((num_options + 5) * sizeof(char *));
+
+ envp = xzalloc(sizeof(char *) * (num_options + 5));
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=/");
+ envp[j++] = bb_xasprintf("interface=%s", client_config.interface);
+ envp[j++] = bb_xasprintf("PATH=%s",
+ getenv("PATH") ? : "/bin:/usr/bin:/sbin:/usr/sbin");
+ envp[j++] = bb_xasprintf("HOME=%s", getenv("HOME") ? : "/");
- if (packet == NULL) {
- envp[j++] = NULL;
- return envp;
- }
+ if (packet == NULL) return envp;
- asprintip(&envp[j++], "ip=", (unsigned char *) &packet->yiaddr);
+ envp[j] = xmalloc(sizeof("ip=255.255.255.255"));
+ sprintip(envp[j++], "ip=", (uint8_t *) &packet->yiaddr);
- for (i = 0; options[i].code; i++) {
- if (!(temp = get_option(packet, options[i].code)))
+ 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], options[i].flags & TYPE_MASK) + strlen(options[i].name) + 2);
- fill_options(envp[j++], temp, &options[i]);
+ 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]);
/* Fill in a subnet bits option for things like /24 */
- if (options[i].code == DHCP_SUBNET) {
+ if (dhcp_options[i].code == DHCP_SUBNET) {
memcpy(&subnet, temp, 4);
- asprintf(&envp[j++], "mask=%d", mton(&subnet));
+ envp[j++] = bb_xasprintf("mask=%d", mton(&subnet));
}
}
if (packet->siaddr) {
- asprintip(&envp[j++], "siaddr=", (unsigned char *) &packet->siaddr);
+ envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));
+ sprintip(envp[j++], "siaddr=", (uint8_t *) &packet->siaddr);
}
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);
+ envp[j++] = bb_xasprintf("boot_file=%s", packet->file);
}
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;
+ envp[j++] = bb_xasprintf("sname=%s", packet->sname);
+ }
return envp;
}
/* Call a script with a par file and env vars */
-void run_script(struct dhcpMessage *packet, const char *name)
+void udhcp_run_script(struct dhcpMessage *packet, const char *name)
{
int pid;
- char **envp;
+ char **envp, **curr;
if (client_config.script == NULL)
return;
+ DEBUG(LOG_INFO, "vforking and execle'ing %s", client_config.script);
+
+ envp = fill_envp(packet);
/* call script */
- pid = fork();
+ pid = vfork();
if (pid) {
waitpid(pid, NULL, 0);
+ for (curr = envp; *curr; curr++) free(*curr);
+ free(envp);
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);
- }
+ }
}
projects / oweals / busybox.git / blobdiff