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dhcpcd/dhcpcd.c

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/*
* dhcpcd - DHCP client daemon
* Copyright 2006-2008 Roy Marples <roy@marples.name>
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
const char copyright[] = "Copyright (c) 2006-2008 Roy Marples";
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <errno.h>
#include <getopt.h>
#include <paths.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#include "client.h"
#include "dhcpcd.h"
#include "dhcp.h"
#include "if.h"
#include "logger.h"
#include "socket.h"
#include "version.h"
static int doversion = 0;
static int dohelp = 0;
#define EXTRA_OPTS
static const struct option longopts[] = {
{"arp", no_argument, NULL, 'a'},
{"script", required_argument, NULL, 'c'},
{"debug", no_argument, NULL, 'd'},
{"hostname", optional_argument, NULL, 'h'},
{"classid", optional_argument, NULL, 'i'},
{"release", no_argument, NULL, 'k'},
{"leasetime", required_argument, NULL, 'l'},
{"metric", required_argument, NULL, 'm'},
{"renew", no_argument, NULL, 'n'},
{"persistent", no_argument, NULL, 'p'},
{"inform", optional_argument, NULL, 's'},
{"request", optional_argument, NULL, 'r'},
{"timeout", required_argument, NULL, 't'},
{"userclass", required_argument, NULL, 'u'},
{"exit", no_argument, NULL, 'x'},
{"lastlease", no_argument, NULL, 'E'},
{"fqdn", optional_argument, NULL, 'F'},
{"nogateway", no_argument, NULL, 'G'},
{"sethostname", no_argument, NULL, 'H'},
{"clientid", optional_argument, NULL, 'I'},
{"noipv4ll", no_argument, NULL, 'L'},
{"nomtu", no_argument, NULL, 'M'},
{"nontp", no_argument, NULL, 'N'},
{"nodns", no_argument, NULL, 'R'},
{"msscr", no_argument, NULL, 'S'},
{"test", no_argument, NULL, 'T'},
{"nonis", no_argument, NULL, 'Y'},
{"help", no_argument, &dohelp, 1},
{"version", no_argument, &doversion, 1},
#ifdef THERE_IS_NO_FORK
{"daemonised", no_argument, NULL, 'f'},
{"skiproutes", required_argument, NULL, 'g'},
#endif
{NULL, 0, NULL, 0}
};
#ifdef THERE_IS_NO_FORK
char dhcpcd[PATH_MAX];
char **dhcpcd_argv = NULL;
int dhcpcd_argc = 0;
char *dhcpcd_skiproutes = NULL;
#undef EXTRA_OPTS
#define EXTRA_OPTS "fg:"
#endif
static int
atoint(const char *s)
{
char *t;
long n;
errno = 0;
n = strtol(s, &t, 0);
if ((errno != 0 && n == 0) || s == t ||
(errno == ERANGE && (n == LONG_MAX || n == LONG_MIN)))
{
logger(LOG_ERR, "`%s' out of range", s);
return -1;
}
return (int)n;
}
static pid_t
read_pid(const char *pidfile)
{
FILE *fp;
pid_t pid = 0;
if ((fp = fopen(pidfile, "r")) == NULL) {
errno = ENOENT;
return 0;
}
fscanf(fp, "%d", &pid);
fclose(fp);
return pid;
}
static void
usage(void)
{
printf("usage: "PACKAGE" [-adknpEGHMNRSTY] [-c script] [-h hostname] [-i classID]\n"
" [-l leasetime] [-m metric] [-r ipaddress] [-s ipaddress]\n"
" [-t timeout] [-u userclass] [-F none | ptr | both]\n"
" [-I clientID] <interface>\n");
}
int
main(int argc, char **argv)
{
struct options *options;
int userclasses = 0;
int opt;
int option_index = 0;
char *prefix;
pid_t pid;
int debug = 0;
int i;
int j;
int pidfd = -1;
int sig = 0;
int retval = EXIT_FAILURE;
char *p;
/* Close any un-needed fd's */
for (i = getdtablesize() - 1; i >= 3; --i)
close (i);
openlog(PACKAGE, LOG_PID, LOG_LOCAL0);
options = xzalloc(sizeof(*options));
options->script = (char *)DEFAULT_SCRIPT;
snprintf(options->classid, CLASS_ID_MAX_LEN, "%s %s",
PACKAGE, VERSION);
options->options |= DHCPCD_ARP | DHCPCD_DNS | DHCPCD_MTU |
DHCPCD_NIS | DHCPCD_NTP | DHCPCD_GATEWAY |
DHCPCD_DAEMONISE | DHCPCD_IPV4LL | DHCPCD_DUID;
options->timeout = DEFAULT_TIMEOUT;
gethostname(options->hostname, sizeof(options->hostname));
if (strcmp(options->hostname, "(none)") == 0 ||
strcmp(options->hostname, "localhost") == 0)
*options->hostname = '\0';
/* Don't set any optional arguments here so we retain POSIX
* compatibility with getopt */
while ((opt = getopt_long(argc, argv, EXTRA_OPTS
"c:dh:i:kl:m:npr:s:t:u:xAEF:GHI:LMNRSTY",
longopts, &option_index)) != -1)
{
switch (opt) {
case 0:
if (longopts[option_index].flag)
break;
logger(LOG_ERR, "option `%s' should set a flag",
longopts[option_index].name);
goto abort;
case 'c':
options->script = optarg;
break;
case 'd':
debug++;
switch (debug) {
case 1:
setloglevel(LOG_DEBUG);
break;
case 2:
options->options &= ~DHCPCD_DAEMONISE;
break;
}
break;
#ifdef THERE_IS_NO_FORK
case 'f':
options->options |= DHCPCD_DAEMONISED;
close_fds();
break;
case 'g':
dhcpcd_skiproutes = xstrdup(optarg);
break;
#endif
case 'h':
if (!optarg)
*options->hostname = '\0';
else if (strlen(optarg) > MAXHOSTNAMELEN) {
logger(LOG_ERR,
"`%s' too long for HostName string,"
" max is %d", optarg, MAXHOSTNAMELEN);
goto abort;
} else
strlcpy(options->hostname, optarg,
sizeof(options->hostname));
break;
case 'i':
if (!optarg) {
*options->classid = '\0';
} else if (strlen(optarg) > CLASS_ID_MAX_LEN) {
logger(LOG_ERR,
"`%s' too long for ClassID string,"
" max is %d", optarg, CLASS_ID_MAX_LEN);
goto abort;
} else
strlcpy(options->classid, optarg,
sizeof(options->classid));
break;
case 'k':
sig = SIGHUP;
break;
case 'l':
if (*optarg == '-') {
logger(LOG_ERR,
"leasetime must be a positive value");
goto abort;
}
errno = 0;
options->leasetime = (uint32_t)strtol(optarg, NULL, 0);
if (errno == EINVAL || errno == ERANGE) {
logger(LOG_ERR, "`%s' out of range", optarg);
goto abort;
}
break;
case 'm':
options->metric = atoint(optarg);
if (options->metric < 0) {
logger(LOG_ERR,
"metric must be a positive value");
goto abort;
}
break;
case 'n':
sig = SIGALRM;
break;
case 'p':
options->options |= DHCPCD_PERSISTENT;
break;
case 's':
options->options |= DHCPCD_INFORM;
options->options &= ~DHCPCD_ARP;
if (!optarg || strlen(optarg) == 0) {
options->request_address.s_addr = 0;
break;
} else {
if ((p = strchr(optarg, '/'))) {
/* nullify the slash, so the -r option
* can read the address */
*p++ = '\0';
if (sscanf(p, "%d", &i) != 1 ||
inet_cidrtoaddr(i, &options->request_netmask) != 0)
{
logger(LOG_ERR,
"`%s' is not a valid CIDR",
p);
goto abort;
}
}
}
/* FALLTHROUGH */
case 'r':
if (!(options->options & DHCPCD_INFORM))
options->options |= DHCPCD_REQUEST;
if (strlen(optarg) > 0 &&
!inet_aton(optarg, &options->request_address))
{
logger(LOG_ERR,
"`%s' is not a valid IP address",
optarg);
goto abort;
}
break;
case 't':
options->timeout = atoint(optarg);
if (options->timeout < 0) {
logger (LOG_ERR, "timeout must be a positive value");
goto abort;
}
break;
case 'u':
j = 0;
for (i = 0; i < userclasses; i++)
j += (int)options->userclass[j] + 1;
if (j + 1 + strlen(optarg) > USERCLASS_MAX_LEN) {
logger(LOG_ERR,
"userclass overrun, max is %d",
USERCLASS_MAX_LEN);
goto abort;
}
userclasses++;
memcpy(options->userclass + j + 1 ,
optarg, strlen(optarg));
options->userclass[j] = strlen(optarg);
options->userclass_len += (strlen(optarg)) + 1;
break;
case 'x':
sig = SIGTERM;
break;
case 'A':
#ifndef ENABLE_ARP
logger (LOG_ERR, "arp not compiled into dhcpcd");
goto abort;
#endif
options->options &= ~DHCPCD_ARP;
break;
case 'E':
#ifndef ENABLE_INFO
logger (LOG_ERR, "info not compiled into dhcpcd");
goto abort;
#endif
options->options |= DHCPCD_LASTLEASE;
break;
case 'F':
if (!optarg) {
options->fqdn = FQDN_BOTH;
break;
}
if (strncmp(optarg, "none", strlen(optarg)) == 0)
options->fqdn = FQDN_NONE;
else if (strncmp(optarg, "ptr", strlen(optarg)) == 0)
options->fqdn = FQDN_PTR;
else if (strncmp(optarg, "both", strlen(optarg)) == 0)
options->fqdn = FQDN_BOTH;
else {
logger(LOG_ERR, "invalid value `%s' for FQDN",
optarg);
goto abort;
}
break;
case 'G':
options->options &= ~DHCPCD_GATEWAY;
break;
case 'H':
options->dohostname++;
break;
case 'I':
if (optarg) {
if (strlen(optarg) > CLIENT_ID_MAX_LEN) {
logger(LOG_ERR, "`%s' is too long for"
" ClientID, max is %d",
optarg, CLIENT_ID_MAX_LEN);
goto abort;
}
if (strlcpy(options->clientid, optarg,
sizeof(options->clientid)) == 0)
/* empty string disabled duid */
options->options &= ~DHCPCD_DUID;
} else {
memset(options->clientid, 0,
sizeof(options->clientid));
options->options &= ~DHCPCD_DUID;
}
break;
case 'L':
options->options &= ~DHCPCD_IPV4LL;
break;
case 'M':
options->options &= ~DHCPCD_MTU;
break;
case 'N':
options->options &= ~DHCPCD_NTP;
break;
case 'R':
options->options &= ~DHCPCD_DNS;
break;
case 'S':
options->domscsr++;
break;
case 'T':
#ifndef ENABLE_INFO
logger(LOG_ERR, "info support not compiled into dhcpcd");
goto abort;
#endif
options->options |= DHCPCD_TEST | DHCPCD_PERSISTENT;
break;
case 'Y':
options->options &= ~DHCPCD_NIS;
break;
case '?':
usage();
goto abort;
default:
usage();
goto abort;
}
}
if (doversion) {
printf(""PACKAGE" "VERSION"\n");
printf("Compile time options:"
#ifdef ENABLE_ARP
" ARP"
#endif
#ifdef ENABLE_DUID
" DUID"
#endif
#ifdef ENABLE_INFO
" INFO"
#endif
#ifdef ENABLE_INFO_COMPAT
" INFO_COMPAT"
#endif
#ifdef ENABLE_IPV4LL
" IPV4LL"
#endif
#ifdef ENABLE_NIS
" NIS"
#endif
#ifdef ENABLE_NTP
" NTP"
#endif
#ifdef SERVICE
" " SERVICE
#endif
#ifdef ENABLE_RESOLVCONF
" RESOLVCONF"
#endif
#ifdef THERE_IS_NO_FORK
" THERE_IS_NO_FORK"
#endif
"\n");
}
if (dohelp)
usage();
#ifdef THERE_IS_NO_FORK
dhcpcd_argv = argv;
dhcpcd_argc = argc;
if (!realpath(argv[0], dhcpcd)) {
logger(LOG_ERR, "unable to resolve the path `%s': %s",
argv[0], strerror(errno));
goto abort;
}
#endif
if (optind < argc) {
if (strlen(argv[optind]) > IF_NAMESIZE) {
logger(LOG_ERR,
"`%s' too long for an interface name (max=%d)",
argv[optind], IF_NAMESIZE);
goto abort;
}
strlcpy(options->interface, argv[optind],
sizeof(options->interface));
} else {
/* If only version was requested then exit now */
if (doversion || dohelp) {
retval = 0;
goto abort;
}
logger(LOG_ERR, "no interface specified");
goto abort;
}
if (strchr(options->hostname, '.')) {
if (options->fqdn == FQDN_DISABLE)
options->fqdn = FQDN_BOTH;
} else
options->fqdn = FQDN_DISABLE;
if (options->request_address.s_addr == 0 &&
options->options & DHCPCD_INFORM)
{
if ((options->request_address.s_addr =
get_address(options->interface)) != 0)
options->options |= DHCPCD_KEEPADDRESS;
}
if (IN_LINKLOCAL(ntohl (options->request_address.s_addr))) {
logger(LOG_ERR,
"you are not allowed to request a link local address");
goto abort;
}
if (geteuid())
logger(LOG_WARNING, PACKAGE " will not work correctly unless"
" run as root");
prefix = xmalloc(sizeof(char) * (IF_NAMESIZE + 3));
snprintf(prefix, IF_NAMESIZE, "%s: ", options->interface);
setlogprefix(prefix);
snprintf(options->pidfile, sizeof(options->pidfile), PIDFILE,
options->interface);
free(prefix);
chdir("/");
umask(022);
if (options->options & DHCPCD_TEST) {
if (options->options & DHCPCD_REQUEST ||
options->options & DHCPCD_INFORM) {
logger(LOG_ERR,
"cannot test with --inform or --request");
goto abort;
}
if (options->options & DHCPCD_LASTLEASE) {
logger(LOG_ERR, "cannot test with --lastlease");
goto abort;
}
if (sig != 0) {
logger(LOG_ERR,
"cannot test with --release or --renew");
goto abort;
}
}
if (sig != 0) {
i = -1;
pid = read_pid(options->pidfile);
if (pid != 0)
logger(LOG_INFO, "sending signal %d to pid %d",
sig, pid);
if (!pid || (i = kill(pid, sig)))
logger(sig == SIGALRM ? LOG_INFO : LOG_ERR,
""PACKAGE" not running");
if (pid != 0 && (sig != SIGALRM || i != 0))
unlink(options->pidfile);
if (i == 0) {
retval = EXIT_SUCCESS;
goto abort;
}
if (sig != SIGALRM)
goto abort;
}
if (!(options->options & DHCPCD_TEST) &&
!(options->options & DHCPCD_DAEMONISED))
{
if ((pid = read_pid(options->pidfile)) > 0 &&
kill(pid, 0) == 0)
{
logger(LOG_ERR, ""PACKAGE
" already running on pid %d (%s)",
pid, options->pidfile);
goto abort;
}
pidfd = open(options->pidfile,
O_WRONLY | O_CREAT | O_NONBLOCK, 0664);
if (pidfd == -1) {
logger(LOG_ERR, "open `%s': %s",
options->pidfile, strerror(errno));
goto abort;
}
/* Lock the file so that only one instance of dhcpcd runs
* on an interface */
if (flock(pidfd, LOCK_EX | LOCK_NB) == -1) {
logger(LOG_ERR, "flock `%s': %s",
options->pidfile, strerror(errno));
goto abort;
}
close_on_exec(pidfd);
writepid(pidfd, getpid());
logger(LOG_INFO, PACKAGE " " VERSION " starting");
}
/* Seed random */
srandomdev();
#ifdef __linux
/* Massage our filters per platform */
setup_packet_filters();
#endif
if (dhcp_run(options, &pidfd) == 0)
retval = EXIT_SUCCESS;
abort:
/* If we didn't daemonise then we need to punt the pidfile now */
if (pidfd > -1) {
close(pidfd);
unlink(options->pidfile);
}
free(options);
#ifdef THERE_IS_NO_FORK
/* There may have been an error before the dhcp_run function
* clears this, so just do it here to be safe */
free(dhcpcd_skiproutes);
#endif
logger(LOG_INFO, "exiting");
exit(retval);
/* NOTREACHED */
}
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