/*
* 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 <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include "config.h"
#include "client.h"
#include "dhcpcd.h"
#include "dhcp.h"
#include "net.h"
#include "logger.h"
#ifdef ANDROID
#include <linux/capability.h>
#include <linux/prctl.h>
#include <cutils/properties.h>
#include <private/android_filesystem_config.h>
#endif
/* Don't set any optional arguments here so we retain POSIX
* compatibility with getopt */
#define OPTS "bc:df:h:i:kl:m:no:pqr:s:t:u:v:xABC:DEF:GI:KLO:Q:TVX:"
static int doversion = 0;
static int dohelp = 0;
static const struct option longopts[] = {
{"background", no_argument, NULL, 'b'},
{"script", required_argument, NULL, 'c'},
{"debug", no_argument, NULL, 'd'},
{"config", required_argument, NULL, 'f'},
{"hostname", optional_argument, NULL, 'h'},
{"vendorclassid", optional_argument, NULL, 'i'},
{"release", no_argument, NULL, 'k'},
{"leasetime", required_argument, NULL, 'l'},
{"metric", required_argument, NULL, 'm'},
{"rebind", no_argument, NULL, 'n'},
{"option", required_argument, NULL, 'o'},
{"persistent", no_argument, NULL, 'p'},
{"quiet", no_argument, NULL, 'q'},
{"request", optional_argument, NULL, 'r'},
{"inform", optional_argument, NULL, 's'},
{"timeout", required_argument, NULL, 't'},
{"userclass", required_argument, NULL, 'u'},
{"vendor", required_argument, NULL, 'v'},
{"exit", no_argument, NULL, 'x'},
{"noarp", no_argument, NULL, 'A'},
{"nobackground", no_argument, NULL, 'B'},
{"nohook", required_argument, NULL, 'C'},
{"duid", no_argument, NULL, 'D'},
{"lastlease", no_argument, NULL, 'E'},
{"fqdn", optional_argument, NULL, 'F'},
{"nogateway", no_argument, NULL, 'G'},
{"clientid", optional_argument, NULL, 'I'},
{"nolink", no_argument, NULL, 'K'},
{"noipv4ll", no_argument, NULL, 'L'},
{"nooption", optional_argument, NULL, 'O'},
{"require", required_argument, NULL, 'Q'},
{"test", no_argument, NULL, 'T'},
{"variables", no_argument, NULL, 'V'},
{"blacklist", required_argument, NULL, 'X'},
{"help", no_argument, &dohelp, 1},
{"version", no_argument, &doversion, 1},
#ifdef CMDLINE_COMPAT
{"classid", optional_argument, NULL, 'i'},
{"renew", no_argument, NULL, 'n'},
{"nohostname", no_argument, NULL, 'H'},
{"nomtu", no_argument, NULL, 'M'},
{"nontp", no_argument, NULL, 'N'},
{"nodns", no_argument, NULL, 'R'},
{"msscr", no_argument, NULL, 'S'},
{"nonis", no_argument, NULL, 'Y'},
#endif
{NULL, 0, NULL, '\0'}
};
#ifdef CMDLINE_COMPAT
# define EXTRA_OPTS "HMNRSY"
#endif
#ifndef EXTRA_OPTS
# define EXTRA_OPTS
#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" [-dknpqxADEGHKLOTV] [-c script] [-f file ] [-h hostname]\n"
" [-i classID ] [-l leasetime] [-m metric] [-o option] [-r ipaddr]\n"
" [-s ipaddr] [-t timeout] [-u userclass] [-F none|ptr|both]\n"
" [-I clientID] [-C hookscript] [-Q option] [-X ipaddr] <interface>\n");
}
static char *
add_environ(struct options *options, const char *value, int uniq)
{
char **newlist;
char **lst = options->environ;
size_t i = 0, l, lv;
char *match = NULL, *p;
match = xstrdup(value);
p = strchr(match, '=');
if (p)
*p++ = '\0';
l = strlen(match);
while (lst && lst[i]) {
if (match && strncmp(lst[i], match, l) == 0) {
if (uniq) {
free(lst[i]);
lst[i] = xstrdup(value);
} else {
/* Append a space and the value to it */
l = strlen(lst[i]);
lv = strlen(p);
lst[i] = xrealloc(lst[i], l + lv + 2);
lst[i][l] = ' ';
memcpy(lst[i] + l + 1, p, lv);
lst[i][l + lv + 1] = '\0';
}
free(match);
return lst[i];
}
i++;
}
newlist = xrealloc(lst, sizeof(char *) * (i + 2));
newlist[i] = xstrdup(value);
newlist[i + 1] = NULL;
options->environ = newlist;
free(match);
return newlist[i];
}
#define parse_string(buf, len, arg) parse_string_hwaddr(buf, len, arg, 0)
static ssize_t
parse_string_hwaddr(char *sbuf, ssize_t slen, char *str, int clid)
{
ssize_t l;
char *p;
int i;
char c[4];
/* If surrounded by quotes then it's a string */
if (*str == '"') {
str++;
l = strlen(str);
p = str + l - 1;
if (*p == '"')
*p = '\0';
} else {
l = hwaddr_aton(NULL, str);
if (l > 1) {
if (l > slen) {
errno = ENOBUFS;
return -1;
}
hwaddr_aton((uint8_t *)sbuf, str);
return l;
}
}
/* Process escapes */
l = 0;
/* If processing a string on the clientid, first byte should be
* 0 to indicate a non hardware type */
if (clid) {
*sbuf++ = 0;
l++;
}
c[3] = '\0';
while (*str) {
if (++l > slen) {
errno = ENOBUFS;
return -1;
}
if (*str == '\\') {
str++;
switch(*str++) {
case '\0':
break;
case 'b':
*sbuf++ = '\b';
break;
case 'n':
*sbuf++ = '\n';
break;
case 'r':
*sbuf++ = '\r';
break;
case 't':
*sbuf++ = '\t';
break;
case 'x':
/* Grab a hex code */
c[1] = '\0';
for (i = 0; i < 2; i++) {
if (isxdigit((unsigned char)*str) == 0)
break;
c[i] = *str++;
}
if (c[1] != '\0') {
c[2] = '\0';
*sbuf++ = strtol(c, NULL, 16);
} else
l--;
break;
case '0':
/* Grab an octal code */
c[2] = '\0';
for (i = 0; i < 3; i++) {
if (*str < '0' || *str > '7')
break;
c[i] = *str++;
}
if (c[2] != '\0') {
i = strtol(c, NULL, 8);
if (i > 255)
i = 255;
*sbuf ++= i;
} else
l--;
break;
default:
*sbuf++ = *str++;
}
} else
*sbuf++ = *str++;
}
return l;
}
static int
parse_option(int opt, char *oarg, struct options *options)
{
int i;
char *p;
ssize_t s;
struct in_addr addr;
switch(opt) {
case 'b':
options->options |= DHCPCD_BACKGROUND;
break;
case 'c':
strlcpy(options->script, oarg, sizeof(options->script));
break;
case 'h':
if (oarg)
s = parse_string(options->hostname + 1,
HOSTNAME_MAX_LEN, oarg);
else
s = 0;
if (s == -1) {
logger(LOG_ERR, "hostname: %s", strerror(errno));
return -1;
}
if (s != 0 && options->hostname[1] == '.') {
logger(LOG_ERR, "hostname cannot begin with a .");
return -1;
}
options->hostname[0] = (uint8_t)s;
break;
case 'i':
if (oarg)
s = parse_string((char *)options->vendorclassid + 1,
VENDORCLASSID_MAX_LEN, oarg);
else
s = 0;
if (s == -1) {
logger(LOG_ERR, "vendorclassid: %s", strerror(errno));
return -1;
}
*options->vendorclassid = (uint8_t)s;
break;
case 'l':
if (*oarg == '-') {
logger(LOG_ERR,
"leasetime must be a positive value");
return -1;
}
errno = 0;
options->leasetime = (uint32_t)strtol(oarg, NULL, 0);
if (errno == EINVAL || errno == ERANGE) {
logger(LOG_ERR, "`%s' out of range", oarg);
return -1;
}
break;
case 'm':
options->metric = atoint(oarg);
if (options->metric < 0) {
logger(LOG_ERR, "metric must be a positive value");
return -1;
}
break;
case 'o':
if (make_option_mask(options->requestmask, &oarg, 1) != 0) {
logger(LOG_ERR, "unknown option `%s'", oarg);
return -1;
}
break;
case 'p':
options->options |= DHCPCD_PERSISTENT;
break;
case 'q':
setloglevel(LOG_WARNING);
break;
case 's':
options->options |= DHCPCD_INFORM;
options->options |= DHCPCD_PERSISTENT;
options->options &= ~DHCPCD_ARP;
if (!oarg || *oarg == '\0') {
options->request_address.s_addr = 0;
break;
} else {
if ((p = strchr(oarg, '/'))) {
/* 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);
return -1;
}
}
}
/* FALLTHROUGH */
case 'r':
if (!(options->options & DHCPCD_INFORM))
options->options |= DHCPCD_REQUEST;
if (oarg && !inet_aton(oarg, &options->request_address)) {
logger(LOG_ERR, "`%s' is not a valid IP address",
oarg);
return -1;
}
break;
case 't':
options->timeout = atoint(oarg);
if (options->timeout < 0) {
logger (LOG_ERR, "timeout must be a positive value");
return -1;
}
break;
case 'u':
s = USERCLASS_MAX_LEN - options->userclass[0] - 1;
s = parse_string((char *)options->userclass + options->userclass[0] + 2,
s, oarg);
if (s == -1) {
logger(LOG_ERR, "userclass: %s", strerror(errno));
return -1;
}
if (s != 0) {
options->userclass[options->userclass[0] + 1] = s;
options->userclass[0] += s + 1;
}
break;
case 'v':
p = strchr(oarg, ',');
if (!p || !p[1]) {
logger(LOG_ERR, "invalid vendor format");
return -1;
}
*p = '\0';
i = atoint(oarg);
oarg = p + 1;
if (i < 1 || i > 254) {
logger(LOG_ERR, "vendor option should be between"
" 1 and 254 inclusive");
return -1;
}
s = VENDOR_MAX_LEN - options->vendor[0] - 2;
if (inet_aton(oarg, &addr) == 1) {
if (s < 6) {
s = -1;
errno = ENOBUFS;
} else
memcpy(options->vendor + options->vendor[0] + 3,
&addr.s_addr, sizeof(addr.s_addr));
} else {
s = parse_string((char *)options->vendor + options->vendor[0] + 3,
s, oarg);
}
if (s == -1) {
logger(LOG_ERR, "vendor: %s", strerror(errno));
return -1;
}
if (s != 0) {
options->vendor[options->vendor[0] + 1] = i;
options->vendor[options->vendor[0] + 2] = s;
options->vendor[0] += s + 2;
}
break;
case 'A':
options->options &= ~DHCPCD_ARP;
/* IPv4LL requires ARP */
options->options &= ~DHCPCD_IPV4LL;
break;
case 'B':
options->options &= ~DHCPCD_DAEMONISE;
break;
case 'C':
/* Commas to spaces for shell */
while ((p = strchr(oarg, ',')))
*p = ' ';
s = strlen("skip_hooks=") + strlen(oarg) + 1;
p = xmalloc(sizeof(char) * s);
snprintf(p, s, "skip_hooks=%s", oarg);
add_environ(options, p, 0);
free(p);
break;
case 'D':
options->options |= DHCPCD_DUID;
break;
case 'E':
options->options |= DHCPCD_LASTLEASE;
break;
case 'F':
if (!oarg) {
options->fqdn = FQDN_BOTH;
break;
}
if (strcmp(oarg, "none") == 0)
options->fqdn = FQDN_NONE;
else if (strcmp(oarg, "ptr") == 0)
options->fqdn = FQDN_PTR;
else if (strcmp(oarg, "both") == 0)
options->fqdn = FQDN_BOTH;
else if (strcmp(oarg, "disable") == 0)
options->fqdn = FQDN_DISABLE;
else {
logger(LOG_ERR, "invalid value `%s' for FQDN",
oarg);
return -1;
}
break;
case 'G':
options->options &= ~DHCPCD_GATEWAY;
break;
case 'I':
/* Strings have a type of 0 */;
options->clientid[1] = 0;
if (oarg)
s = parse_string_hwaddr((char *)options->clientid + 1,
CLIENTID_MAX_LEN, oarg, 1);
else
s = 0;
if (s == -1) {
logger(LOG_ERR, "clientid: %s", strerror(errno));
return -1;
}
options->clientid[0] = (uint8_t)s;
if (s == 0) {
options->options &= ~DHCPCD_DUID;
options->options &= ~DHCPCD_CLIENTID;
}
break;
case 'K':
options->options &= ~DHCPCD_LINK;
break;
case 'L':
options->options &= ~DHCPCD_IPV4LL;
break;
case 'O':
if (make_option_mask(options->requestmask, &oarg, -1) != 0 ||
make_option_mask(options->requiremask, &oarg, -1) != 0 ||
make_option_mask(options->nomask, &oarg, 1) != 0)
{
logger(LOG_ERR, "unknown option `%s'", oarg);
return -1;
}
break;
case 'Q':
if (make_option_mask(options->requiremask, &oarg, 1) != 0 ||
make_option_mask(options->requestmask, &oarg, 1) != 0)
{
logger(LOG_ERR, "unknown option `%s'", oarg);
return -1;
}
break;
case 'X':
if (!inet_aton(oarg, &addr)) {
logger(LOG_ERR, "`%s' is not a valid IP address",
oarg);
return -1;
}
options->blacklist = xrealloc(options->blacklist,
sizeof(in_addr_t) * (options->blacklist_len + 1));
options->blacklist[options->blacklist_len] = addr.s_addr;
options->blacklist_len++;
break;
default:
return 0;
}
return 1;
}
static int
parse_config_line(const char *opt, char *line, struct options *options)
{
unsigned int i;
for (i = 0; i < sizeof(longopts) / sizeof(longopts[0]); i++) {
if (!longopts[i].name ||
strcmp(longopts[i].name, opt) != 0)
continue;
if (longopts[i].has_arg == required_argument && !line) {
fprintf(stderr,
PACKAGE ": option requires an argument -- %s\n",
opt);
return -1;
}
return parse_option(longopts[i].val, line, options);
}
fprintf(stderr, PACKAGE ": unknown option -- %s\n", opt);
return -1;
}
#ifdef ANDROID
void switchUser() {
gid_t groups[] = { AID_INET, AID_SHELL };
setgroups(sizeof(groups)/sizeof(groups[0]), groups);
prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
setgid(AID_DHCP);
setuid(AID_DHCP);
struct __user_cap_header_struct header;
struct __user_cap_data_struct cap;
header.version = _LINUX_CAPABILITY_VERSION;
header.pid = 0;
cap.effective = cap.permitted =
(1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW) |
(1 << CAP_NET_BROADCAST) | (1 << CAP_NET_BIND_SERVICE);
cap.inheritable = 0;
capset(&header, &cap);
}
#endif /* ANDROID */
int
main(int argc, char **argv)
{
struct options *options;
int opt;
int option_index = 0;
char *prefix;
pid_t pid;
int debug = 0;
int i, r;
int pid_fd = -1;
int sig = 0;
int retval = EXIT_FAILURE;
char *line, *option, *p, *buffer = NULL;
size_t len = 0;
FILE *f;
char *cf = NULL;
char *intf = NULL;
struct timespec ts;
#ifdef ANDROID
switchUser();
#endif
closefrom(3);
/* Saves calling fflush(stream) in the logger */
setlinebuf(stdout);
openlog(PACKAGE, LOG_PID, LOG_LOCAL0);
setlogprefix(PACKAGE ": ");
options = xzalloc(sizeof(*options));
options->options |= DHCPCD_CLIENTID | DHCPCD_GATEWAY | DHCPCD_DAEMONISE;
options->options |= DHCPCD_ARP | DHCPCD_IPV4LL | DHCPCD_LINK;
options->timeout = DEFAULT_TIMEOUT;
strlcpy(options->script, SCRIPT, sizeof(options->script));
options->vendorclassid[0] = snprintf((char *)options->vendorclassid + 1,
VENDORCLASSID_MAX_LEN,
"%s %s", PACKAGE, VERSION);
#ifdef CMDLINE_COMPAT
add_option_mask(options->requestmask, DHO_DNSSERVER);
add_option_mask(options->requestmask, DHO_DNSDOMAIN);
add_option_mask(options->requestmask, DHO_DNSSEARCH);
add_option_mask(options->requestmask, DHO_NISSERVER);
add_option_mask(options->requestmask, DHO_NISDOMAIN);
add_option_mask(options->requestmask, DHO_NTPSERVER);
/* If the duid file exists, then enable duid by default
* This means we don't break existing clients that easily :) */
if ((f = fopen(DUID, "r"))) {
options->options |= DHCPCD_DUID;
fclose(f);
}
#endif
gethostname(options->hostname + 1, sizeof(options->hostname));
if (strcmp(options->hostname + 1, "(none)") == 0 ||
strcmp(options->hostname + 1, "localhost") == 0)
options->hostname[1] = '\0';
*options->hostname = strlen(options->hostname + 1);
while ((opt = getopt_long(argc, argv, OPTS EXTRA_OPTS,
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 'f':
cf = optarg;
break;
case 'V':
print_options();
goto abort;
case '?':
usage();
goto abort;
}
}
if (doversion)
printf(""PACKAGE" "VERSION"\n%s\n", copyright);
if (dohelp)
usage();
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;
}
/* Parse our options file */
f = fopen(cf ? cf : CONFIG, "r");
if (f) {
r = 1;
while ((get_line(&buffer, &len, f))) {
line = buffer;
while ((option = strsep(&line, " \t")))
if (*option != '\0')
break;
if (!option || *option == '\0' || *option == '#')
continue;
/* Trim leading whitespace */
if (line) {
while (*line != '\0' && (*line == ' ' || *line == '\t'))
line++;
}
/* Trim trailing whitespace */
if (line && *line) {
p = line + strlen(line) - 1;
while (p != line &&
(*p == ' ' || *p == '\t') &&
*(p - 1) != '\\')
*p-- = '\0';
}
if (strcmp(option, "interface") == 0) {
free(intf);
intf = xstrdup(line);
continue;
}
/* If we're in an interface block don't use these
* options unless it's for us */
if (intf && strcmp(intf, options->interface) != 0)
continue;
r = parse_config_line(option, line, options);
if (r != 1)
break;
}
free(buffer);
free(intf);
fclose(f);
if (r == 0)
usage();
if (r != 1)
goto abort;
} else {
if (errno != ENOENT || cf) {
logger(LOG_ERR, "fopen `%s': %s", cf ? cf : CONFIG,
strerror(errno));
goto abort;
}
}
optind = 0;
while ((opt = getopt_long(argc, argv, OPTS EXTRA_OPTS,
longopts, &option_index)) != -1)
{
switch (opt) {
case 'd':
debug++;
switch (debug) {
case 1:
setloglevel(LOG_DEBUG);
break;
case 2:
options->options &= ~DHCPCD_DAEMONISE;
break;
}
break;
case 'f':
break;
case 'k':
sig = SIGHUP;
break;
case 'n':
sig = SIGALRM;
break;
case 'x':
sig = SIGTERM;
break;
case 'T':
options->options |= DHCPCD_TEST | DHCPCD_PERSISTENT;
break;
#ifdef CMDLINE_COMPAT
case 'H': /* FALLTHROUGH */
case 'M':
del_option_mask(options->requestmask, DHO_MTU);
break;
case 'N':
del_option_mask(options->requestmask, DHO_NTPSERVER);
break;
case 'R':
del_option_mask(options->requestmask, DHO_DNSSERVER);
del_option_mask(options->requestmask, DHO_DNSDOMAIN);
del_option_mask(options->requestmask, DHO_DNSSEARCH);
break;
case 'S':
add_option_mask(options->requestmask, DHO_MSCSR);
break;
case 'Y':
del_option_mask(options->requestmask, DHO_NISSERVER);
del_option_mask(options->requestmask, DHO_NISDOMAIN);
break;
#endif
default:
i = parse_option(opt, optarg, options);
if (i == 1)
break;
if (i == 0)
usage();
goto abort;
}
}
#ifdef THERE_IS_NO_FORK
options->options &= ~DHCPCD_DAEMONISE;
#endif
#ifndef ANDROID
/* android runs us as user "dhcp" */
if (geteuid())
logger(LOG_WARNING, PACKAGE " will not work correctly unless"
" run as root");
#endif
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;
}
}
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);
if (options->request_address.s_addr == 0 &&
(options->options & DHCPCD_INFORM ||
options->options & DHCPCD_REQUEST))
{
errno = 0;
if (get_address(options->interface,
&options->request_address,
&options->request_netmask) != 1)
{
if (errno)
logger(LOG_ERR, "get_address: %s",
strerror(errno));
else
logger(LOG_ERR, "no existing address");
goto abort;
}
}
if (IN_LINKLOCAL(ntohl(options->request_address.s_addr))) {
logger(LOG_ERR,
"you are not allowed to request a link local address");
goto abort;
}
chdir("/");
umask(022);
if (sig != 0 && !(options->options & DHCPCD_DAEMONISED)) {
#ifdef ANDROID
char pidpropname[PROPERTY_KEY_MAX];
char pidpropval[PROPERTY_VALUE_MAX];
i = -1;
if (snprintf(pidpropname,
sizeof(pidpropname),
"dhcp.%s.pid", options->interface) >= PROPERTY_KEY_MAX) {
goto abort;
}
property_get(pidpropname, pidpropval, NULL);
if (strlen(pidpropval) == 0) {
goto abort;
}
pid = atoi(pidpropval);
#else
i = -1;
pid = read_pid(options->pidfile);
#endif
if (pid != 0)
logger(LOG_INFO, "sending signal %d to pid %d",
sig, pid);
if (!pid || (i = kill(pid, sig))) {
if (sig != SIGALRM)
logger(LOG_ERR, ""PACKAGE" not running");
unlink(options->pidfile);
}
if (i == 0) {
if (sig == SIGALRM) {
retval = EXIT_SUCCESS;
goto abort;
}
/* Spin until it exits */
logger(LOG_INFO, "waiting for pid %d to exit", pid);
ts.tv_sec = 0;
ts.tv_nsec = 100000000; /* 10th of a second */
for(i = 0; i < 100; i++) {
nanosleep(&ts, NULL);
if (read_pid(options->pidfile) == 0) {
retval = EXIT_SUCCESS;
break;
}
}
if (retval != EXIT_SUCCESS)
logger(LOG_ERR, "pid %d failed to exit", pid);
goto abort;
}
if (sig != SIGALRM)
goto abort;
}
if (!(options->options & DHCPCD_TEST) &&
!(options->options & DHCPCD_DAEMONISED))
{
#ifdef ANDROID
char pidpropname[PROPERTY_KEY_MAX];
char pidpropval[PROPERTY_VALUE_MAX];
#endif
#ifndef ANDROID
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;
}
#endif
pid_fd = open(options->pidfile,
O_WRONLY | O_CREAT | O_NONBLOCK, 0664);
if (pid_fd == -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(pid_fd, LOCK_EX | LOCK_NB) == -1) {
logger(LOG_ERR, "flock `%s': %s",
options->pidfile, strerror(errno));
goto abort;
}
if (set_cloexec(pid_fd) == -1)
goto abort;
#ifdef ANDROID
if (snprintf(pidpropname,
sizeof(pidpropname),
"dhcp.%s.pid", options->interface) >= PROPERTY_KEY_MAX) {
goto abort;
}
if (snprintf(pidpropval, sizeof(pidpropval), "%d", getpid()) >= PROPERTY_VALUE_MAX) {
goto abort;
}
property_set(pidpropname, pidpropval);
#else
writepid(pid_fd, getpid());
#endif
logger(LOG_INFO, PACKAGE " " VERSION " starting");
}
/* Terminate the encapsulated options */
if (options->vendor[0]) {
options->vendor[0]++;
options->vendor[options->vendor[0]] = DHO_END;
}
if (dhcp_run(options, &pid_fd) == 0)
retval = EXIT_SUCCESS;
abort:
/* If we didn't daemonise then we need to punt the pidfile now */
if (pid_fd > -1) {
close(pid_fd);
unlink(options->pidfile);
}
if (options->environ) {
len = 0;
while (options->environ[len])
free(options->environ[len++]);
free(options->environ);
}
free(options->blacklist);
free(options);
exit(retval);
/* NOTREACHED */
}