305 lines
7.3 KiB
C
305 lines
7.3 KiB
C
/*from $KAME: dhcp6c_script.c,v 1.11 2004/11/28 10:48:38 jinmei Exp $ */
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/*
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* Copyright (C) 2003 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/queue.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#if TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#include <netinet/in.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <errno.h>
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#include "dhcp6.h"
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#include "config.h"
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#include "common.h"
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static char client_str[] = "client";
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static char buf[BUFSIZ];
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static char *iapd2str __P((int, struct dhcp6_listval *));
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static char *iana2str __P((int, struct dhcp6_listval *));
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int
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relay6_script(scriptpath, client, dh6, len)
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char *scriptpath;
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struct sockaddr_in6 *client;
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struct dhcp6 *dh6;
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int len;
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{
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struct dhcp6_optinfo optinfo;
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struct dhcp6opt *optend;
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int i, j, iapds, ianas, envc, elen, ret = 0;
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char **envp, *s, *t;
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struct dhcp6_listval *v;
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pid_t pid, wpid;
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/* if a script is not specified, do nothing */
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if (scriptpath == NULL || strlen(scriptpath) == 0)
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return -1;
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/* only replies are interesting */
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if (dh6->dh6_msgtype != DH6_REPLY) {
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if (dh6->dh6_msgtype != DH6_ADVERTISE) {
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dprintf(LOG_INFO, FNAME, "forward msg#%d to client?",
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dh6->dh6_msgtype);
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return -1;
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}
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return 0;
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}
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/* parse options */
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optend = (struct dhcp6opt *)((caddr_t) dh6 + len);
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dhcp6_init_options(&optinfo);
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if (dhcp6_get_options((struct dhcp6opt *)(dh6 + 1), optend,
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&optinfo) < 0) {
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dprintf(LOG_INFO, FNAME, "failed to parse options");
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return -1;
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}
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/* initialize counters */
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iapds = 0;
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ianas = 0;
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envc = 2; /* we at least include the address and the terminator */
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/* count the number of variables */
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for (v = TAILQ_FIRST(&optinfo.iapd_list); v; v = TAILQ_NEXT(v, link))
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iapds++;
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envc += iapds;
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for (v = TAILQ_FIRST(&optinfo.iana_list); v; v = TAILQ_NEXT(v, link))
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ianas++;
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envc += ianas;
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/* allocate an environments array */
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if ((envp = malloc(sizeof (char *) * envc)) == NULL) {
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dprintf(LOG_NOTICE, FNAME,
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"failed to allocate environment buffer");
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dhcp6_clear_options(&optinfo);
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return -1;
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}
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memset(envp, 0, sizeof (char *) * envc);
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/*
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* Copy the parameters as environment variables
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*/
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i = 0;
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/* address */
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t = addr2str((struct sockaddr *) client);
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if (t == NULL) {
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dprintf(LOG_NOTICE, FNAME,
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"failed to get address of client");
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ret = -1;
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goto clean;
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}
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elen = sizeof (client_str) + 1 + strlen(t) + 1;
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if ((s = envp[i++] = malloc(elen)) == NULL) {
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dprintf(LOG_NOTICE, FNAME,
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"failed to allocate string for client");
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ret = -1;
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goto clean;
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}
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memset(s, 0, elen);
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snprintf(s, elen, "%s=%s", client_str, t);
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/* IAs */
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j = 0;
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for (v = TAILQ_FIRST(&optinfo.iapd_list); v;
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v = TAILQ_NEXT(v, link)) {
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if ((s = envp[i++] = iapd2str(j++, v)) == NULL) {
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ret = -1;
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goto clean;
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}
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}
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j = 0;
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for (v = TAILQ_FIRST(&optinfo.iana_list); v;
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v = TAILQ_NEXT(v, link)) {
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if ((s = envp[i++] = iana2str(j++, v)) == NULL) {
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ret = -1;
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goto clean;
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}
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}
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/* launch the script */
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pid = fork();
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if (pid < 0) {
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dprintf(LOG_ERR, FNAME, "failed to fork: %s", strerror(errno));
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ret = -1;
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goto clean;
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} else if (pid) {
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int wstatus;
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do {
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wpid = wait(&wstatus);
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} while (wpid != pid && wpid > 0);
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if (wpid < 0)
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dprintf(LOG_ERR, FNAME, "wait: %s", strerror(errno));
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else {
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dprintf(LOG_DEBUG, FNAME,
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"script \"%s\" terminated", scriptpath);
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}
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} else {
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char *argv[2];
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int fd;
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argv[0] = scriptpath;
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argv[1] = NULL;
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if (safefile(scriptpath)) {
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dprintf(LOG_ERR, FNAME,
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"script \"%s\" cannot be executed safely",
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scriptpath);
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exit(1);
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}
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if (foreground == 0 &&
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(fd = open("/dev/null", O_RDWR)) != -1) {
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dup2(fd, STDIN_FILENO);
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dup2(fd, STDOUT_FILENO);
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dup2(fd, STDERR_FILENO);
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if (fd > STDERR_FILENO)
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close(fd);
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}
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execve(scriptpath, argv, envp);
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dprintf(LOG_ERR, FNAME, "child: exec failed: %s",
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strerror(errno));
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exit(0);
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}
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clean:
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for (i = 0; i < envc; i++)
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free(envp[i]);
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free(envp);
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dhcp6_clear_options(&optinfo);
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return ret;
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}
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static char *
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iapd2str(num, iav)
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int num;
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struct dhcp6_listval *iav;
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{
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struct dhcp6_listval *siav;
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char *s, *r, *comma;
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s = buf;
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memset(s, 0, BUFSIZ);
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snprintf(s, BUFSIZ, "iapd_%d=", num);
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comma = "";
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for (siav = TAILQ_FIRST(&iav->sublist); siav;
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siav = TAILQ_NEXT(siav, link)) {
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switch (siav->type) {
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case DHCP6_LISTVAL_PREFIX6:
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snprintf(s + strlen(s), BUFSIZ - strlen(s),
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"%s%s/%d", comma,
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in6addr2str(&siav->val_prefix6.addr, 0),
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siav->val_prefix6.plen);
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comma = ",";
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break;
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case DHCP6_LISTVAL_STCODE:
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snprintf(s + strlen(s), BUFSIZ - strlen(s),
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"%s#%d", comma, siav->val_num16);
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comma = ",";
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break;
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default:
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dprintf(LOG_ERR, FNAME, "impossible subopt");
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}
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}
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if ((r = strdup(s)) == NULL)
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dprintf(LOG_ERR, FNAME, "failed to allocate iapd_%d", num);
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return r;
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}
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static char *
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iana2str(num, iav)
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int num;
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struct dhcp6_listval *iav;
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{
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struct dhcp6_listval *siav;
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char *s, *r, *comma;
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s = buf;
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memset(s, 0, BUFSIZ);
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snprintf(s, BUFSIZ, "iana_%d=", num);
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comma = "";
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for (siav = TAILQ_FIRST(&iav->sublist); siav;
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siav = TAILQ_NEXT(siav, link)) {
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switch (siav->type) {
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case DHCP6_LISTVAL_STATEFULADDR6:
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snprintf(s + strlen(s), BUFSIZ - strlen(s),
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"%s%s", comma,
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in6addr2str(&siav->val_statefuladdr6.addr, 0));
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comma = ",";
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break;
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case DHCP6_LISTVAL_STCODE:
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snprintf(s + strlen(s), BUFSIZ - strlen(s),
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"%s#%d", comma, siav->val_num16);
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comma = ",";
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break;
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default:
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dprintf(LOG_ERR, FNAME, "impossible subopt");
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}
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}
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if ((r = strdup(s)) == NULL)
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dprintf(LOG_ERR, FNAME, "failed to allocate iana_%d", num);
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return r;
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}
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