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authorGravatar Russ Dill <Russ.Dill@asu.edu>2002-10-14 21:41:28 +0000
committerGravatar Russ Dill <Russ.Dill@asu.edu>2002-10-14 21:41:28 +0000
commit61fb48930f45aa536584b2047f9e703186e8f69f (patch)
treee3b93e0a694be81939f8c4762553c43ffdb9b10b /networking/udhcp/script.c
parent9060a7315980bb05f42eab76b88746d43e138188 (diff)
downloadbusybox-61fb48930f45aa536584b2047f9e703186e8f69f.tar.gz
busybox-61fb48930f45aa536584b2047f9e703186e8f69f.tar.bz2
added full udhcp integration
Diffstat (limited to 'networking/udhcp/script.c')
-rw-r--r--networking/udhcp/script.c228
1 files changed, 228 insertions, 0 deletions
diff --git a/networking/udhcp/script.c b/networking/udhcp/script.c
new file mode 100644
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+++ b/networking/udhcp/script.c
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+/* 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.
+ */
+
+#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 <errno.h>
+
+#include "options.h"
+#include "dhcpd.h"
+#include "dhcpc.h"
+#include "packet.h"
+#include "options.h"
+#include "debug.h"
+
+/* get a rough idea of how long an option will be (rounding up...) */
+static int max_option_length[] = {
+ [OPTION_IP] = sizeof("255.255.255.255 "),
+ [OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2,
+ [OPTION_STRING] = 1,
+ [OPTION_BOOLEAN] = sizeof("yes "),
+ [OPTION_U8] = sizeof("255 "),
+ [OPTION_U16] = sizeof("65535 "),
+ [OPTION_S16] = sizeof("-32768 "),
+ [OPTION_U32] = sizeof("4294967295 "),
+ [OPTION_S32] = sizeof("-2147483684 "),
+};
+
+
+static int upper_length(int length, struct dhcp_option *option)
+{
+ return max_option_length[option->flags & TYPE_MASK] *
+ (length / option_lengths[option->flags & TYPE_MASK]);
+}
+
+
+static int sprintip(char *dest, char *pre, unsigned char *ip) {
+ 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)
+{
+ int type, optlen;
+ u_int16_t val_u16;
+ int16_t val_s16;
+ u_int32_t val_u32;
+ int32_t val_s32;
+ int len = option[OPT_LEN - 2];
+
+ dest += sprintf(dest, "%s=", type_p->name);
+
+ type = type_p->flags & TYPE_MASK;
+ optlen = option_lengths[type];
+ for(;;) {
+ switch (type) {
+ case OPTION_IP_PAIR:
+ dest += sprintip(dest, "", option);
+ *(dest++) = '/';
+ option += 4;
+ optlen = 4;
+ case OPTION_IP: /* Works regardless of host byte order. */
+ dest += sprintip(dest, "", option);
+ break;
+ case OPTION_BOOLEAN:
+ dest += sprintf(dest, *option ? "yes " : "no ");
+ break;
+ case OPTION_U8:
+ dest += sprintf(dest, "%u ", *option);
+ break;
+ case OPTION_U16:
+ memcpy(&val_u16, option, 2);
+ dest += sprintf(dest, "%u ", ntohs(val_u16));
+ break;
+ case OPTION_S16:
+ memcpy(&val_s16, option, 2);
+ dest += sprintf(dest, "%d ", ntohs(val_s16));
+ break;
+ case OPTION_U32:
+ memcpy(&val_u32, option, 4);
+ dest += sprintf(dest, "%lu ", (unsigned long) ntohl(val_u32));
+ break;
+ case OPTION_S32:
+ memcpy(&val_s32, option, 4);
+ dest += sprintf(dest, "%ld ", (long) ntohl(val_s32));
+ break;
+ case OPTION_STRING:
+ memcpy(dest, option, len);
+ dest[len] = '\0';
+ return; /* Short circuit this case */
+ }
+ option += optlen;
+ len -= optlen;
+ if (len <= 0) break;
+ }
+}
+
+
+static char *find_env(const char *prefix, char *defaultstr)
+{
+ extern char **environ;
+ char **ptr;
+ const int len = strlen(prefix);
+
+ for (ptr = environ; *ptr != NULL; ptr++) {
+ if (strncmp(prefix, *ptr, len) == 0)
+ return *ptr;
+ }
+ return defaultstr;
+}
+
+
+/* put all the paramaters into an environment */
+static char **fill_envp(struct dhcpMessage *packet)
+{
+ int num_options = 0;
+ int i, j;
+ char **envp;
+ unsigned char *temp;
+ char over = 0;
+
+ if (packet == NULL)
+ num_options = 0;
+ else {
+ for (i = 0; options[i].code; i++)
+ if (get_option(packet, options[i].code))
+ num_options++;
+ 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++;
+ }
+
+ envp = xmalloc((num_options + 5) * sizeof(char *));
+ envp[0] = xmalloc(sizeof("interface=") + strlen(client_config.interface));
+ sprintf(envp[0], "interface=%s", client_config.interface);
+ envp[1] = find_env("PATH", "PATH=/bin:/usr/bin:/sbin:/usr/sbin");
+ envp[2] = find_env("HOME", "HOME=/");
+
+ if (packet == NULL) {
+ envp[3] = NULL;
+ return envp;
+ }
+
+ envp[3] = xmalloc(sizeof("ip=255.255.255.255"));
+ sprintip(envp[3], "ip=", (unsigned char *) &packet->yiaddr);
+ for (i = 0, j = 4; options[i].code; i++) {
+ if ((temp = get_option(packet, options[i].code))) {
+ envp[j] = xmalloc(upper_length(temp[OPT_LEN - 2], &options[i]) + strlen(options[i].name) + 2);
+ fill_options(envp[j], temp, &options[i]);
+ j++;
+ }
+ }
+ if (packet->siaddr) {
+ envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));
+ sprintip(envp[j++], "siaddr=", (unsigned char *) &packet->siaddr);
+ }
+ if (!(over & FILE_FIELD) && packet->file[0]) {
+ /* watch out for invalid packets */
+ packet->file[sizeof(packet->file) - 1] = '\0';
+ envp[j] = xmalloc(sizeof("boot_file=") + strlen(packet->file));
+ sprintf(envp[j++], "boot_file=%s", packet->file);
+ }
+ if (!(over & SNAME_FIELD) && packet->sname[0]) {
+ /* watch out for invalid packets */
+ packet->sname[sizeof(packet->sname) - 1] = '\0';
+ envp[j] = xmalloc(sizeof("sname=") + strlen(packet->sname));
+ sprintf(envp[j++], "sname=%s", packet->sname);
+ }
+ envp[j] = NULL;
+ return envp;
+}
+
+
+/* Call a script with a par file and env vars */
+void run_script(struct dhcpMessage *packet, const char *name)
+{
+ int pid;
+ char **envp;
+
+ if (client_config.script == NULL)
+ return;
+
+ /* 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: %s",
+ client_config.script, strerror(errno));
+ exit(1);
+ }
+}