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nsd.c
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/*
* nsd.c -- nsd(8)
*
* Copyright (c) 2001-2006, NLnet Labs. All rights reserved.
*
* See LICENSE for the license.
*
*/
#include "config.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef HAVE_GRP_H
#include <grp.h>
#endif /* HAVE_GRP_H */
#ifdef HAVE_SETUSERCONTEXT
#include <login_cap.h>
#endif /* HAVE_SETUSERCONTEXT */
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "nsd.h"
#include "options.h"
#include "tsig.h"
#include "remote.h"
#include "xfrd-disk.h"
/* The server handler... */
struct nsd nsd;
static char hostname[MAXHOSTNAMELEN];
extern config_parser_state_type* cfg_parser;
static void error(const char *format, ...) ATTR_FORMAT(printf, 1, 2);
/*
* Print the help text.
*
*/
static void
usage (void)
{
fprintf(stderr, "Usage: nsd [OPTION]...\n");
fprintf(stderr, "Name Server Daemon.\n\n");
fprintf(stderr,
"Supported options:\n"
" -4 Only listen to IPv4 connections.\n"
" -6 Only listen to IPv6 connections.\n"
" -a ip-address[@port] Listen to the specified incoming IP address (and port)\n"
" May be specified multiple times).\n"
" -c configfile Read specified configfile instead of %s.\n"
" -d do not fork as a daemon process.\n"
#ifndef NDEBUG
" -F facilities Specify the debug facilities.\n"
#endif /* NDEBUG */
" -f database Specify the database to load.\n"
" -h Print this help information.\n"
, CONFIGFILE);
fprintf(stderr,
" -i identity Specify the identity when queried for id.server CHAOS TXT.\n"
" -I nsid Specify the NSID. This must be a hex string.\n"
#ifndef NDEBUG
" -L level Specify the debug level.\n"
#endif /* NDEBUG */
" -l filename Specify the log file.\n"
" -N server-count The number of servers to start.\n"
" -n tcp-count The maximum number of TCP connections per server.\n"
" -P pidfile Specify the PID file to write.\n"
" -p port Specify the port to listen to.\n"
" -s seconds Dump statistics every SECONDS seconds.\n"
" -t chrootdir Change root to specified directory on startup.\n"
);
fprintf(stderr,
" -u user Change effective uid to the specified user.\n"
" -V level Specify verbosity level.\n"
" -v Print version information.\n"
);
fprintf(stderr, "Version %s. Report bugs to <%s>.\n",
PACKAGE_VERSION, PACKAGE_BUGREPORT);
}
/*
* Print the version exit.
*
*/
static void
version(void)
{
fprintf(stderr, "%s version %s\n", PACKAGE_NAME, PACKAGE_VERSION);
fprintf(stderr, "Written by NLnet Labs.\n\n");
fprintf(stderr,
"Copyright (C) 2001-2006 NLnet Labs. This is free software.\n"
"There is NO warranty; not even for MERCHANTABILITY or FITNESS\n"
"FOR A PARTICULAR PURPOSE.\n");
exit(0);
}
/*
* Something went wrong, give error messages and exit.
*
*/
static void
error(const char *format, ...)
{
va_list args;
va_start(args, format);
log_vmsg(LOG_ERR, format, args);
va_end(args);
exit(1);
}
static void
append_trailing_slash(const char** dirname, region_type* region)
{
int l = strlen(*dirname);
if (l>0 && (*dirname)[l-1] != '/' && l < 0xffffff) {
char *dirname_slash = region_alloc(region, l+2);
memcpy(dirname_slash, *dirname, l+1);
strlcat(dirname_slash, "/", l+2);
/* old dirname is leaked, this is only used for chroot, once */
*dirname = dirname_slash;
}
}
static int
file_inside_chroot(const char* fname, const char* chr)
{
/* true if filename starts with chroot or is not absolute */
return ((fname && fname[0] && strncmp(fname, chr, strlen(chr)) == 0) ||
(fname && fname[0] != '/'));
}
void
get_ip_port_frm_str(const char* arg, const char** hostname,
const char** port)
{
/* parse src[@port] option */
char* delim = NULL;
if (arg) {
delim = strchr(arg, '@');
}
if (delim) {
*delim = '\0';
*port = delim+1;
}
*hostname = arg;
}
/* append interface to interface array (names, udp, tcp) */
void
add_interface(char*** nodes, struct nsd* nsd, char* ip)
{
/* realloc the arrays */
if(nsd->ifs == 0) {
*nodes = xalloc_zero(sizeof(*nodes));
nsd->udp = xalloc_zero(sizeof(*nsd->udp));
nsd->tcp = xalloc_zero(sizeof(*nsd->udp));
} else {
*nodes = xrealloc(*nodes, (nsd->ifs+1)*sizeof(*nodes));
nsd->udp = xrealloc(nsd->udp, (nsd->ifs+1)*sizeof(*nsd->udp));
nsd->tcp = xrealloc(nsd->tcp, (nsd->ifs+1)*sizeof(*nsd->udp));
(*nodes)[nsd->ifs] = NULL;
memset(&nsd->udp[nsd->ifs], 0, sizeof(*nsd->udp));
memset(&nsd->tcp[nsd->ifs], 0, sizeof(*nsd->tcp));
}
/* add it */
(*nodes)[nsd->ifs] = ip;
++nsd->ifs;
}
/*
* Fetch the nsd parent process id from the nsd pidfile
*
*/
pid_t
readpid(const char *file)
{
int fd;
pid_t pid;
char pidbuf[16];
char *t;
int l;
if ((fd = open(file, O_RDONLY)) == -1) {
return -1;
}
if (((l = read(fd, pidbuf, sizeof(pidbuf)))) == -1) {
close(fd);
return -1;
}
close(fd);
/* Empty pidfile means no pidfile... */
if (l == 0) {
errno = ENOENT;
return -1;
}
pid = (pid_t) strtol(pidbuf, &t, 10);
if (*t && *t != '\n') {
return -1;
}
return pid;
}
/*
* Store the nsd parent process id in the nsd pidfile
*
*/
int
writepid(struct nsd *nsd)
{
FILE * fd;
char pidbuf[32];
snprintf(pidbuf, sizeof(pidbuf), "%lu\n", (unsigned long) nsd->pid);
if ((fd = fopen(nsd->pidfile, "w")) == NULL ) {
log_msg(LOG_ERR, "cannot open pidfile %s: %s",
nsd->pidfile, strerror(errno));
return -1;
}
if (!write_data(fd, pidbuf, strlen(pidbuf))) {
log_msg(LOG_ERR, "cannot write pidfile %s: %s",
nsd->pidfile, strerror(errno));
fclose(fd);
return -1;
}
fclose(fd);
if (chown(nsd->pidfile, nsd->uid, nsd->gid) == -1) {
log_msg(LOG_ERR, "cannot chown %u.%u %s: %s",
(unsigned) nsd->uid, (unsigned) nsd->gid,
nsd->pidfile, strerror(errno));
return -1;
}
return 0;
}
void
unlinkpid(const char* file)
{
int fd = -1;
if (file) {
/* truncate pidfile */
fd = open(file, O_WRONLY | O_TRUNC, 0644);
if (fd == -1) {
/* Truncate the pid file. */
log_msg(LOG_ERR, "can not truncate the pid file %s: %s", file, strerror(errno));
} else
close(fd);
/* unlink pidfile */
if (unlink(file) == -1)
log_msg(LOG_WARNING, "failed to unlink pidfile %s: %s",
file, strerror(errno));
}
}
/*
* Incoming signals, set appropriate actions.
*
*/
void
sig_handler(int sig)
{
/* To avoid race cond. We really don't want to use log_msg() in this handler */
/* Are we a child server? */
if (nsd.server_kind != NSD_SERVER_MAIN) {
switch (sig) {
case SIGCHLD:
nsd.signal_hint_child = 1;
break;
case SIGALRM:
break;
case SIGINT:
case SIGTERM:
nsd.signal_hint_quit = 1;
break;
case SIGILL:
case SIGUSR1: /* Dump stats on SIGUSR1. */
nsd.signal_hint_statsusr = 1;
break;
default:
break;
}
return;
}
/* We are the main process */
switch (sig) {
case SIGCHLD:
nsd.signal_hint_child = 1;
return;
case SIGHUP:
nsd.signal_hint_reload_hup = 1;
return;
case SIGALRM:
nsd.signal_hint_stats = 1;
break;
case SIGILL:
/*
* For backwards compatibility with BIND 8 and older
* versions of NSD.
*/
nsd.signal_hint_statsusr = 1;
break;
case SIGUSR1:
/* Dump statistics. */
nsd.signal_hint_statsusr = 1;
break;
case SIGINT:
case SIGTERM:
default:
nsd.signal_hint_shutdown = 1;
break;
}
}
/*
* Statistic output...
*
*/
#ifdef BIND8_STATS
void
bind8_stats (struct nsd *nsd)
{
char buf[MAXSYSLOGMSGLEN];
char *msg, *t;
int i, len;
/* Current time... */
time_t now;
if(!nsd->st.period)
return;
time(&now);
/* NSTATS */
t = msg = buf + snprintf(buf, MAXSYSLOGMSGLEN, "NSTATS %lld %lu",
(long long) now, (unsigned long) nsd->st.boot);
for (i = 0; i <= 255; i++) {
/* How much space left? */
if ((len = buf + MAXSYSLOGMSGLEN - t) < 32) {
log_msg(LOG_INFO, "%s", buf);
t = msg;
len = buf + MAXSYSLOGMSGLEN - t;
}
if (nsd->st.qtype[i] != 0) {
t += snprintf(t, len, " %s=%lu", rrtype_to_string(i), nsd->st.qtype[i]);
}
}
if (t > msg)
log_msg(LOG_INFO, "%s", buf);
/* XSTATS */
/* Only print it if we're in the main daemon or have anything to report... */
if (nsd->server_kind == NSD_SERVER_MAIN
|| nsd->st.dropped || nsd->st.raxfr || (nsd->st.qudp + nsd->st.qudp6 - nsd->st.dropped)
|| nsd->st.txerr || nsd->st.opcode[OPCODE_QUERY] || nsd->st.opcode[OPCODE_IQUERY]
|| nsd->st.wrongzone || nsd->st.ctcp + nsd->st.ctcp6 || nsd->st.rcode[RCODE_SERVFAIL]
|| nsd->st.rcode[RCODE_FORMAT] || nsd->st.nona || nsd->st.rcode[RCODE_NXDOMAIN]
|| nsd->st.opcode[OPCODE_UPDATE]) {
log_msg(LOG_INFO, "XSTATS %lld %lu"
" RR=%lu RNXD=%lu RFwdR=%lu RDupR=%lu RFail=%lu RFErr=%lu RErr=%lu RAXFR=%lu"
" RLame=%lu ROpts=%lu SSysQ=%lu SAns=%lu SFwdQ=%lu SDupQ=%lu SErr=%lu RQ=%lu"
" RIQ=%lu RFwdQ=%lu RDupQ=%lu RTCP=%lu SFwdR=%lu SFail=%lu SFErr=%lu SNaAns=%lu"
" SNXD=%lu RUQ=%lu RURQ=%lu RUXFR=%lu RUUpd=%lu",
(long long) now, (unsigned long) nsd->st.boot,
nsd->st.dropped, (unsigned long)0, (unsigned long)0, (unsigned long)0, (unsigned long)0,
(unsigned long)0, (unsigned long)0, nsd->st.raxfr, (unsigned long)0, (unsigned long)0,
(unsigned long)0, nsd->st.qudp + nsd->st.qudp6 - nsd->st.dropped, (unsigned long)0,
(unsigned long)0, nsd->st.txerr,
nsd->st.opcode[OPCODE_QUERY], nsd->st.opcode[OPCODE_IQUERY], nsd->st.wrongzone,
(unsigned long)0, nsd->st.ctcp + nsd->st.ctcp6,
(unsigned long)0, nsd->st.rcode[RCODE_SERVFAIL], nsd->st.rcode[RCODE_FORMAT],
nsd->st.nona, nsd->st.rcode[RCODE_NXDOMAIN],
(unsigned long)0, (unsigned long)0, (unsigned long)0, nsd->st.opcode[OPCODE_UPDATE]);
}
}
#endif /* BIND8_STATS */
extern char *optarg;
extern int optind;
int
main(int argc, char *argv[])
{
/* Scratch variables... */
int c;
pid_t oldpid;
size_t i;
struct sigaction action;
#ifdef HAVE_GETPWNAM
struct passwd *pwd = NULL;
#endif /* HAVE_GETPWNAM */
struct addrinfo hints[2];
int hints_in_use = 1;
char** nodes = NULL; /* array of address strings, size nsd.ifs */
const char *udp_port = 0;
const char *tcp_port = 0;
const char *configfile = CONFIGFILE;
char* argv0 = (argv0 = strrchr(argv[0], '/')) ? argv0 + 1 : argv[0];
log_init(argv0);
/* Initialize the server handler... */
memset(&nsd, 0, sizeof(struct nsd));
nsd.region = region_create(xalloc, free);
nsd.dbfile = 0;
nsd.pidfile = 0;
nsd.server_kind = NSD_SERVER_MAIN;
memset(&hints, 0, sizeof(*hints)*2);
hints[0].ai_family = DEFAULT_AI_FAMILY;
hints[0].ai_flags = AI_PASSIVE;
hints[1].ai_family = DEFAULT_AI_FAMILY;
hints[1].ai_flags = AI_PASSIVE;
nsd.identity = 0;
nsd.version = VERSION;
nsd.username = 0;
nsd.chrootdir = 0;
nsd.nsid = NULL;
nsd.nsid_len = 0;
nsd.child_count = 0;
nsd.maximum_tcp_count = 0;
nsd.current_tcp_count = 0;
nsd.grab_ip6_optional = 0;
nsd.file_rotation_ok = 0;
/* Set up our default identity to gethostname(2) */
if (gethostname(hostname, MAXHOSTNAMELEN) == 0) {
nsd.identity = hostname;
} else {
log_msg(LOG_ERR,
"failed to get the host name: %s - using default identity",
strerror(errno));
nsd.identity = IDENTITY;
}
/* Parse the command line... */
while ((c = getopt(argc, argv, "46a:c:df:hi:I:l:N:n:P:p:s:u:t:X:V:v"
#ifndef NDEBUG /* <mattthijs> only when configured with --enable-checking */
"F:L:"
#endif /* NDEBUG */
)) != -1) {
switch (c) {
case '4':
hints[0].ai_family = AF_INET;
break;
case '6':
#ifdef INET6
hints[0].ai_family = AF_INET6;
#else /* !INET6 */
error("IPv6 support not enabled.");
#endif /* INET6 */
break;
case 'a':
add_interface(&nodes, &nsd, optarg);
break;
case 'c':
configfile = optarg;
break;
case 'd':
nsd.debug = 1;
break;
case 'f':
nsd.dbfile = optarg;
break;
case 'h':
usage();
exit(0);
case 'i':
nsd.identity = optarg;
break;
case 'I':
if (nsd.nsid_len != 0) {
/* can only be given once */
break;
}
if (strncasecmp(optarg, "ascii_", 6) == 0) {
nsd.nsid = xalloc(strlen(optarg+6));
nsd.nsid_len = strlen(optarg+6);
memmove(nsd.nsid, optarg+6, nsd.nsid_len);
} else {
if (strlen(optarg) % 2 != 0) {
error("the NSID must be a hex string of an even length.");
}
nsd.nsid = xalloc(strlen(optarg) / 2);
nsd.nsid_len = strlen(optarg) / 2;
if (hex_pton(optarg, nsd.nsid, nsd.nsid_len) == -1) {
error("hex string cannot be parsed '%s' in NSID.", optarg);
}
}
break;
case 'l':
nsd.log_filename = optarg;
break;
case 'N':
i = atoi(optarg);
if (i <= 0) {
error("number of child servers must be greater than zero.");
} else {
nsd.child_count = i;
}
break;
case 'n':
i = atoi(optarg);
if (i <= 0) {
error("number of concurrent TCP connections must greater than zero.");
} else {
nsd.maximum_tcp_count = i;
}
break;
case 'P':
nsd.pidfile = optarg;
break;
case 'p':
if (atoi(optarg) == 0) {
error("port argument must be numeric.");
}
tcp_port = optarg;
udp_port = optarg;
break;
case 's':
#ifdef BIND8_STATS
nsd.st.period = atoi(optarg);
#else /* !BIND8_STATS */
error("BIND 8 statistics not enabled.");
#endif /* BIND8_STATS */
break;
case 't':
#ifdef HAVE_CHROOT
nsd.chrootdir = optarg;
#else /* !HAVE_CHROOT */
error("chroot not supported on this platform.");
#endif /* HAVE_CHROOT */
break;
case 'u':
nsd.username = optarg;
break;
case 'V':
verbosity = atoi(optarg);
break;
case 'v':
version();
/* version exits */
#ifndef NDEBUG
case 'F':
sscanf(optarg, "%x", &nsd_debug_facilities);
break;
case 'L':
sscanf(optarg, "%d", &nsd_debug_level);
break;
#endif /* NDEBUG */
case '?':
default:
usage();
exit(1);
}
}
argc -= optind;
argv += optind;
/* Commandline parse error */
if (argc != 0) {
usage();
exit(1);
}
if (strlen(nsd.identity) > UCHAR_MAX) {
error("server identity too long (%u characters)",
(unsigned) strlen(nsd.identity));
}
if(!tsig_init(nsd.region))
error("init tsig failed");
/* Read options */
nsd.options = nsd_options_create(region_create_custom(xalloc, free,
DEFAULT_CHUNK_SIZE, DEFAULT_LARGE_OBJECT_SIZE,
DEFAULT_INITIAL_CLEANUP_SIZE, 1));
if(!parse_options_file(nsd.options, configfile, NULL, NULL)) {
error("could not read config: %s\n", configfile);
}
if(!parse_zone_list_file(nsd.options)) {
error("could not read zonelist file %s\n",
nsd.options->zonelistfile);
}
if(nsd.options->do_ip4 && !nsd.options->do_ip6) {
hints[0].ai_family = AF_INET;
}
#ifdef INET6
if(nsd.options->do_ip6 && !nsd.options->do_ip4) {
hints[0].ai_family = AF_INET6;
}
#endif /* INET6 */
if(nsd.options->ip_addresses)
{
ip_address_option_type* ip = nsd.options->ip_addresses;
while(ip) {
add_interface(&nodes, &nsd, ip->address);
ip = ip->next;
}
}
if (verbosity == 0)
verbosity = nsd.options->verbosity;
#ifndef NDEBUG
if (nsd_debug_level > 0 && verbosity == 0)
verbosity = nsd_debug_level;
#endif /* NDEBUG */
if(nsd.options->debug_mode) nsd.debug=1;
if(!nsd.dbfile)
{
if(nsd.options->database)
nsd.dbfile = nsd.options->database;
else
nsd.dbfile = DBFILE;
}
if(!nsd.pidfile)
{
if(nsd.options->pidfile)
nsd.pidfile = nsd.options->pidfile;
else
nsd.pidfile = PIDFILE;
}
if(strcmp(nsd.identity, hostname)==0 || strcmp(nsd.identity,IDENTITY)==0)
{
if(nsd.options->identity)
nsd.identity = nsd.options->identity;
}
if(nsd.options->version) {
nsd.version = nsd.options->version;
}
if (nsd.options->logfile && !nsd.log_filename) {
nsd.log_filename = nsd.options->logfile;
}
if(nsd.child_count == 0) {
nsd.child_count = nsd.options->server_count;
}
#ifdef SO_REUSEPORT
if(nsd.options->reuseport && nsd.child_count > 1) {
nsd.reuseport = nsd.child_count;
}
#endif /* SO_REUSEPORT */
if(nsd.maximum_tcp_count == 0) {
nsd.maximum_tcp_count = nsd.options->tcp_count;
}
nsd.tcp_timeout = nsd.options->tcp_timeout;
nsd.tcp_query_count = nsd.options->tcp_query_count;
nsd.tcp_mss = nsd.options->tcp_mss;
nsd.outgoing_tcp_mss = nsd.options->outgoing_tcp_mss;
nsd.ipv4_edns_size = nsd.options->ipv4_edns_size;
nsd.ipv6_edns_size = nsd.options->ipv6_edns_size;
if(udp_port == 0)
{
if(nsd.options->port != 0) {
udp_port = nsd.options->port;
tcp_port = nsd.options->port;
} else {
udp_port = UDP_PORT;
tcp_port = TCP_PORT;
}
}
#ifdef BIND8_STATS
if(nsd.st.period == 0) {
nsd.st.period = nsd.options->statistics;
}
#endif /* BIND8_STATS */
#ifdef HAVE_CHROOT
if(nsd.chrootdir == 0) nsd.chrootdir = nsd.options->chroot;
#ifdef CHROOTDIR
/* if still no chrootdir, fallback to default */
if(nsd.chrootdir == 0) nsd.chrootdir = CHROOTDIR;
#endif /* CHROOTDIR */
#endif /* HAVE_CHROOT */
if(nsd.username == 0) {
if(nsd.options->username) nsd.username = nsd.options->username;
else nsd.username = USER;
}
if(nsd.options->zonesdir && nsd.options->zonesdir[0]) {
if(chdir(nsd.options->zonesdir)) {
error("cannot chdir to '%s': %s",
nsd.options->zonesdir, strerror(errno));
}
DEBUG(DEBUG_IPC,1, (LOG_INFO, "changed directory to %s",
nsd.options->zonesdir));
}
/* EDNS0 */
edns_init_data(&nsd.edns_ipv4, nsd.options->ipv4_edns_size);
#if defined(INET6)
#if defined(IPV6_USE_MIN_MTU) || defined(IPV6_MTU)
edns_init_data(&nsd.edns_ipv6, nsd.options->ipv6_edns_size);
#else /* no way to set IPV6 MTU, send no bigger than that. */
if (nsd.options->ipv6_edns_size < IPV6_MIN_MTU)
edns_init_data(&nsd.edns_ipv6, nsd.options->ipv6_edns_size);
else
edns_init_data(&nsd.edns_ipv6, IPV6_MIN_MTU);
#endif /* IPV6 MTU) */
#endif /* defined(INET6) */
if (nsd.nsid_len == 0 && nsd.options->nsid) {
if (strlen(nsd.options->nsid) % 2 != 0) {
error("the NSID must be a hex string of an even length.");
}
nsd.nsid = xalloc(strlen(nsd.options->nsid) / 2);
nsd.nsid_len = strlen(nsd.options->nsid) / 2;
if (hex_pton(nsd.options->nsid, nsd.nsid, nsd.nsid_len) == -1) {
error("hex string cannot be parsed '%s' in NSID.", nsd.options->nsid);
}
}
edns_init_nsid(&nsd.edns_ipv4, nsd.nsid_len);
#if defined(INET6)
edns_init_nsid(&nsd.edns_ipv6, nsd.nsid_len);
#endif /* defined(INET6) */
/* Number of child servers to fork. */
nsd.children = (struct nsd_child *) region_alloc_array(
nsd.region, nsd.child_count, sizeof(struct nsd_child));
for (i = 0; i < nsd.child_count; ++i) {
nsd.children[i].kind = NSD_SERVER_BOTH;
nsd.children[i].pid = -1;
nsd.children[i].child_fd = -1;
nsd.children[i].parent_fd = -1;
nsd.children[i].handler = NULL;
nsd.children[i].need_to_send_STATS = 0;
nsd.children[i].need_to_send_QUIT = 0;
nsd.children[i].need_to_exit = 0;
nsd.children[i].has_exited = 0;
}
nsd.this_child = NULL;
/* We need at least one active interface */
if (nsd.ifs == 0) {
add_interface(&nodes, &nsd, NULL);
/*
* With IPv6 we'd like to open two separate sockets,
* one for IPv4 and one for IPv6, both listening to
* the wildcard address (unless the -4 or -6 flags are
* specified).
*
* However, this is only supported on platforms where
* we can turn the socket option IPV6_V6ONLY _on_.
* Otherwise we just listen to a single IPv6 socket
* and any incoming IPv4 connections will be
* automatically mapped to our IPv6 socket.
*/
#ifdef INET6
if (hints[0].ai_family == AF_UNSPEC) {
#ifdef IPV6_V6ONLY
add_interface(&nodes, &nsd, NULL);
hints[0].ai_family = AF_INET6;
hints[1].ai_family = AF_INET;
hints_in_use = 2;
nsd.grab_ip6_optional = 1;
#else /* !IPV6_V6ONLY */
hints[0].ai_family = AF_INET6;
#endif /* IPV6_V6ONLY */
}
#endif /* INET6 */
}
/* Set up the address info structures with real interface/port data */
for (i = 0; i < nsd.ifs; ++i) {
int r;
const char* node = NULL;
const char* service = NULL;
int h = ((hints_in_use == 1)?0:i%hints_in_use);
/* We don't perform name-lookups */
if (nodes[i] != NULL)
hints[h].ai_flags |= AI_NUMERICHOST;
get_ip_port_frm_str(nodes[i], &node, &service);
hints[h].ai_socktype = SOCK_DGRAM;
if ((r=getaddrinfo(node, (service?service:udp_port), &hints[h], &nsd.udp[i].addr)) != 0) {
#ifdef INET6
if(nsd.grab_ip6_optional && hints[0].ai_family == AF_INET6) {
log_msg(LOG_WARNING, "No IPv6, fallback to IPv4. getaddrinfo: %s",
r==EAI_SYSTEM?strerror(errno):gai_strerror(r));
continue;
}
#endif
error("cannot parse address '%s': getaddrinfo: %s %s",
nodes[i]?nodes[i]:"(null)",
gai_strerror(r),
r==EAI_SYSTEM?strerror(errno):"");
}
hints[h].ai_socktype = SOCK_STREAM;
if ((r=getaddrinfo(node, (service?service:tcp_port), &hints[h], &nsd.tcp[i].addr)) != 0) {
error("cannot parse address '%s': getaddrinfo: %s %s",
nodes[i]?nodes[i]:"(null)",
gai_strerror(r),
r==EAI_SYSTEM?strerror(errno):"");
}
}
/* Parse the username into uid and gid */
nsd.gid = getgid();
nsd.uid = getuid();
#ifdef HAVE_GETPWNAM
/* Parse the username into uid and gid */
if (*nsd.username) {
if (isdigit((unsigned char)*nsd.username)) {
char *t;
nsd.uid = strtol(nsd.username, &t, 10);
if (*t != 0) {
if (*t != '.' || !isdigit((unsigned char)*++t)) {
error("-u user or -u uid or -u uid.gid");
}
nsd.gid = strtol(t, &t, 10);
} else {
/* Lookup the group id in /etc/passwd */
if ((pwd = getpwuid(nsd.uid)) == NULL) {
error("user id %u does not exist.", (unsigned) nsd.uid);
} else {
nsd.gid = pwd->pw_gid;
}
}
} else {
/* Lookup the user id in /etc/passwd */
if ((pwd = getpwnam(nsd.username)) == NULL) {
error("user '%s' does not exist.", nsd.username);
} else {
nsd.uid = pwd->pw_uid;
nsd.gid = pwd->pw_gid;
}
}
}
/* endpwent(); */
#endif /* HAVE_GETPWNAM */
#if defined(HAVE_SSL)
key_options_tsig_add(nsd.options);
#endif
append_trailing_slash(&nsd.options->xfrdir, nsd.options->region);
/* Check relativity of pathnames to chroot */
if (nsd.chrootdir && nsd.chrootdir[0]) {
/* existing chrootdir: append trailing slash for strncmp checking */
append_trailing_slash(&nsd.chrootdir, nsd.region);
append_trailing_slash(&nsd.options->zonesdir, nsd.options->region);
/* zonesdir must be absolute and within chroot,
* all other pathnames may be relative to zonesdir */
if (strncmp(nsd.options->zonesdir, nsd.chrootdir, strlen(nsd.chrootdir)) != 0) {
error("zonesdir %s has to be an absolute path that starts with the chroot path %s",
nsd.options->zonesdir, nsd.chrootdir);
} else if (!file_inside_chroot(nsd.pidfile, nsd.chrootdir)) {
error("pidfile %s is not relative to %s: chroot not possible",
nsd.pidfile, nsd.chrootdir);
} else if (!file_inside_chroot(nsd.dbfile, nsd.chrootdir)) {
error("database %s is not relative to %s: chroot not possible",
nsd.dbfile, nsd.chrootdir);
} else if (!file_inside_chroot(nsd.options->xfrdfile, nsd.chrootdir)) {
error("xfrdfile %s is not relative to %s: chroot not possible",
nsd.options->xfrdfile, nsd.chrootdir);
} else if (!file_inside_chroot(nsd.options->zonelistfile, nsd.chrootdir)) {
error("zonelistfile %s is not relative to %s: chroot not possible",
nsd.options->zonelistfile, nsd.chrootdir);
} else if (!file_inside_chroot(nsd.options->xfrdir, nsd.chrootdir)) {
error("xfrdir %s is not relative to %s: chroot not possible",
nsd.options->xfrdir, nsd.chrootdir);
}
}
/* Set up the logging */
log_open(LOG_PID, FACILITY, nsd.log_filename);
if (!nsd.log_filename)
log_set_log_function(log_syslog);
else if (nsd.uid && nsd.gid) {
if(chown(nsd.log_filename, nsd.uid, nsd.gid) != 0)
VERBOSITY(2, (LOG_WARNING, "chown %s failed: %s",
nsd.log_filename, strerror(errno)));
}
log_msg(LOG_NOTICE, "%s starting (%s)", argv0, PACKAGE_STRING);
/* Do we have a running nsd? */
if ((oldpid = readpid(nsd.pidfile)) == -1) {
if (errno != ENOENT) {
log_msg(LOG_ERR, "can't read pidfile %s: %s",
nsd.pidfile, strerror(errno));
}
} else {
if (kill(oldpid, 0) == 0 || errno == EPERM) {
log_msg(LOG_WARNING,
"%s is already running as %u, continuing",
argv0, (unsigned) oldpid);
} else {
log_msg(LOG_ERR,
"...stale pid file from process %u",
(unsigned) oldpid);
}
}
/* Setup the signal handling... */
action.sa_handler = sig_handler;
sigfillset(&action.sa_mask);
action.sa_flags = 0;
sigaction(SIGTERM, &action, NULL);
sigaction(SIGHUP, &action, NULL);
sigaction(SIGINT, &action, NULL);
sigaction(SIGILL, &action, NULL);
sigaction(SIGUSR1, &action, NULL);
sigaction(SIGALRM, &action, NULL);
sigaction(SIGCHLD, &action, NULL);
action.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &action, NULL);
/* Initialize... */
nsd.mode = NSD_RUN;
nsd.signal_hint_child = 0;
nsd.signal_hint_reload = 0;
nsd.signal_hint_reload_hup = 0;
nsd.signal_hint_quit = 0;
nsd.signal_hint_shutdown = 0;
nsd.signal_hint_stats = 0;
nsd.signal_hint_statsusr = 0;
nsd.quit_sync_done = 0;
/* Initialize the server... */
if (server_init(&nsd) != 0) {
error("server initialization failed, %s could "
"not be started", argv0);
}
#if defined(HAVE_SSL)
if(nsd.options->control_enable) {
/* read ssl keys while superuser and outside chroot */
if(!(nsd.rc = daemon_remote_create(nsd.options)))
error("could not perform remote control setup");
}
#endif /* HAVE_SSL */
/* Unless we're debugging, fork... */
if (!nsd.debug) {
int fd;
/* Take off... */
switch ((nsd.pid = fork())) {
case 0:
/* Child */
break;
case -1:
error("fork() failed: %s", strerror(errno));
default:
/* Parent is done */
server_close_all_sockets(nsd.udp, nsd.ifs);
server_close_all_sockets(nsd.tcp, nsd.ifs);
exit(0);
}
/* Detach ourselves... */
if (setsid() == -1) {
error("setsid() failed: %s", strerror(errno));
}
if ((fd = open("/dev/null", O_RDWR, 0)) != -1) {
(void)dup2(fd, STDIN_FILENO);
(void)dup2(fd, STDOUT_FILENO);
(void)dup2(fd, STDERR_FILENO);
if (fd > 2)
(void)close(fd);