Pi-Hole/dnsmasq
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import of dnsmasq-2.23.tar.gz

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This commit is contained in:
Simon Kelley
2005-08-29 12:19:27 +01:00
parent 91dccd0958
commit 3d8df260e1
32 changed files with 1861 additions and 575 deletions
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221
src/dnsmasq.c
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@@ -14,6 +14,27 @@
#include "dnsmasq.h"
static char *compile_opts =
#ifndef HAVE_IPV6
"no-"
#endif
"IPv6 "
#ifndef HAVE_GETOPT_LONG
"no-"
#endif
"GNU-getopt "
#ifdef HAVE_BROKEN_RTC
"no-RTC "
#endif
#ifndef HAVE_ISC_READER
"no-"
#endif
"ISC-leasefile "
#ifndef HAVE_DBUS
"no-"
#endif
"DBus";
static volatile int sigterm, sighup, sigusr1, sigalarm, num_kids, in_child;
static int set_dns_listeners(struct daemon *daemon, fd_set *set, int maxfd);
@@ -25,9 +46,7 @@ int main (int argc, char **argv)
struct daemon *daemon;
int first_loop = 1;
int bind_fallback = 0;
time_t resolv_changed = 0;
time_t now, last = 0;
struct irec *interfaces;
struct sigaction sigact;
sigset_t sigmask;
struct iname *if_tmp;
@@ -65,7 +84,7 @@ int main (int argc, char **argv)
sigaddset(&sigact.sa_mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &sigact.sa_mask, &sigmask);
daemon = read_opts(argc, argv);
daemon = read_opts(argc, argv, compile_opts);
if (daemon->edns_pktsz < PACKETSZ)
daemon->edns_pktsz = PACKETSZ;
@@ -83,7 +102,7 @@ int main (int argc, char **argv)
die("ISC dhcpd integration not available: set HAVE_ISC_READER in src/config.h", NULL);
#endif
if (!enumerate_interfaces(daemon, &interfaces, NULL, NULL))
if (!enumerate_interfaces(daemon, &daemon->interfaces, NULL, NULL))
die("failed to find list of interfaces: %s", NULL);
if (!(daemon->options & OPT_NOWILD) &&
@@ -95,7 +114,7 @@ int main (int argc, char **argv)
if (daemon->options & OPT_NOWILD)
{
daemon->listeners = create_bound_listeners(interfaces, daemon->port);
daemon->listeners = create_bound_listeners(daemon->interfaces, daemon->port);
for (if_tmp = daemon->if_names; if_tmp; if_tmp = if_tmp->next)
if (if_tmp->name && !if_tmp->used)
@@ -104,18 +123,8 @@ int main (int argc, char **argv)
for (if_tmp = daemon->if_addrs; if_tmp; if_tmp = if_tmp->next)
if (!if_tmp->used)
{
char *addrbuff = daemon->namebuff;
#ifdef HAVE_IPV6
if (if_tmp->addr.sa.sa_family == AF_INET)
inet_ntop(AF_INET, &if_tmp->addr.in.sin_addr,
addrbuff, ADDRSTRLEN);
else
inet_ntop(AF_INET6, &if_tmp->addr.in6.sin6_addr,
addrbuff, ADDRSTRLEN);
#else
strcpy(addrbuff, inet_ntoa(if_tmp->addr.in.sin_addr));
#endif
die("no interface with address %s", addrbuff);
prettyprint_addr(&if_tmp->addr, daemon->namebuff);
die("no interface with address %s", daemon->namebuff);
}
}
@@ -144,6 +153,20 @@ int main (int argc, char **argv)
lease_init(daemon, now);
}
if (daemon->options & OPT_DBUS)
#ifdef HAVE_DBUS
{
char *err;
daemon->dbus = NULL;
daemon->watches = NULL;
if ((err = dbus_init(daemon)))
die("DBus error: %s", err);
}
#else
if (daemon->options & OPT_DBUS)
die("DBus not available: set HAVE_DBUS in src/config.h", NULL);
#endif
/* If query_port is set then create a socket now, before dumping root
for use to access nameservers without more specific source addresses.
This allows query_port to be a low port */
@@ -174,14 +197,19 @@ int main (int argc, char **argv)
if (!(daemon->options & OPT_DEBUG))
{
FILE *pidfile;
struct serverfd *serverfdp;
struct listener *listener;
struct passwd *ent_pw;
int i;
fd_set test_set;
int maxfd, i;
FD_ZERO(&test_set);
maxfd = set_dns_listeners(daemon, &test_set, -1);
#ifdef HAVE_DBUS
maxfd = set_dbus_listeners(daemon, maxfd, &test_set, &test_set, &test_set);
#endif
/* The following code "daemonizes" the process.
See Stevens section 12.4 */
#ifndef NO_FORK
if (!(daemon->options & OPT_NO_FORK))
{
@@ -209,28 +237,19 @@ int main (int argc, char **argv)
for (i=0; i<64; i++)
{
for (listener = daemon->listeners; listener; listener = listener->next)
if (listener->fd == i || listener->tcpfd == i)
break;
if (listener)
continue;
#ifdef HAVE_BROKEN_RTC
if (i == daemon->uptime_fd)
continue;
#endif
if (daemon->dhcp &&
(i == daemon->lease_fd ||
i == daemon->dhcpfd ||
i == daemon->dhcp_raw_fd ||
i == daemon->dhcp_icmp_fd))
continue;
for (serverfdp = daemon->sfds; serverfdp; serverfdp = serverfdp->next)
if (serverfdp->fd == i)
break;
if (serverfdp)
if (i <= maxfd && FD_ISSET(i, &test_set))
continue;
close(i);
@@ -261,7 +280,19 @@ int main (int argc, char **argv)
syslog(LOG_INFO, "started, version %s cachesize %d", VERSION, daemon->cachesize);
else
syslog(LOG_INFO, "started, version %s cache disabled", VERSION);
syslog(LOG_INFO, "compile time options: %s", compile_opts);
#ifdef HAVE_DBUS
if (daemon->options & OPT_DBUS)
{
if (daemon->dbus)
syslog(LOG_INFO, "DBus support enabled: connected to system bus");
else
syslog(LOG_INFO, "DBus support enabled: bus connection pending");
}
#endif
if (bind_fallback)
syslog(LOG_WARNING, "setting --bind-interfaces option because of OS limitations");
@@ -304,28 +335,19 @@ int main (int argc, char **argv)
if (!(daemon->options & OPT_DEBUG) && (getuid() == 0 || geteuid() == 0))
syslog(LOG_WARNING, "running as root");
check_servers(daemon, interfaces);
check_servers(daemon);
while (sigterm == 0)
{
fd_set rset;
fd_set rset, wset, eset;
if (sighup)
{
cache_reload(daemon->options, daemon->namebuff, daemon->domain_suffix, daemon->addn_hosts);
if (daemon->dhcp)
{
if (daemon->options & OPT_ETHERS)
dhcp_read_ethers(daemon);
dhcp_update_configs(daemon->dhcp_conf);
lease_update_from_configs(daemon->dhcp_conf, daemon->domain_suffix);
lease_update_file(0, now);
lease_update_dns(daemon);
}
clear_cache_and_reload(daemon, now);
if (daemon->resolv_files && (daemon->options & OPT_NO_POLL))
{
reload_servers(daemon->resolv_files->name, daemon);
check_servers(daemon, interfaces);
check_servers(daemon);
}
sighup = 0;
}
@@ -349,11 +371,15 @@ int main (int argc, char **argv)
}
FD_ZERO(&rset);
FD_ZERO(&wset);
FD_ZERO(&eset);
if (!first_loop)
{
int maxfd = set_dns_listeners(daemon, &rset, 0);
int maxfd = set_dns_listeners(daemon, &rset, -1);
#ifdef HAVE_DBUS
maxfd = set_dbus_listeners(daemon, maxfd, &rset, &wset, &eset);
#endif
if (daemon->dhcp)
{
FD_SET(daemon->dhcpfd, &rset);
@@ -361,25 +387,56 @@ int main (int argc, char **argv)
maxfd = daemon->dhcpfd;
}
/* Whilst polling for the dbus, wake every quarter second */
#ifdef HAVE_PSELECT
if (pselect(maxfd+1, &rset, NULL, NULL, NULL, &sigmask) < 0)
FD_ZERO(&rset); /* rset otherwise undefined after error */
{
struct timespec *tp = NULL;
#ifdef HAVE_DBUS
struct timespec t;
if ((daemon->options & OPT_DBUS) && !daemon->dbus)
{
tp = &t;
tp->tv_sec = 0;
tp->tv_nsec = 250000000;
}
#endif
if (pselect(maxfd+1, &rset, &wset, &eset, tp, &sigmask) < 0)
{
/* otherwise undefined after error */
FD_ZERO(&rset); FD_ZERO(&wset); FD_ZERO(&eset);
}
}
#else
{
sigset_t save_mask;
struct timeval *tp = NULL;
#ifdef HAVE_DBUS
struct timeval t;
if ((daemon->options & OPT_DBUS) && !daemon->dbus)
{
tp = &t;
tp->tv_sec = 0;
tp->tv_usec = 250000;
}
#endif
sigprocmask(SIG_SETMASK, &sigmask, &save_mask);
if (select(maxfd+1, &rset, NULL, NULL, NULL) < 0)
FD_ZERO(&rset); /* rset otherwise undefined after error */
if (select(maxfd+1, &rset, &wset, &eset, tp) < 0)
{
/* otherwise undefined after error */
FD_ZERO(&rset); FD_ZERO(&wset); FD_ZERO(&eset);
}
sigprocmask(SIG_SETMASK, &save_mask, NULL);
}
#endif
}
first_loop = 0;
now = dnsmasq_time(daemon->uptime_fd);
/* Check for changes to resolv files once per second max. */
if (last == 0 || difftime(now, last) > 1.0)
/* Don't go silent for long periods if the clock goes backwards. */
if (last == 0 || difftime(now, last) > 1.0 || difftime(now, last) < 1.0)
{
last = now;
@@ -407,24 +464,40 @@ int main (int argc, char **argv)
else
{
res->logged = 0;
if (difftime(statbuf.st_mtime, last_change) > 0.0)
if (statbuf.st_mtime != res->mtime)
{
last_change = statbuf.st_mtime;
latest = res;
res->mtime = statbuf.st_mtime;
if (difftime(res->mtime, last_change) > 0.0)
{
last_change = res->mtime;
latest = res;
}
}
}
res = res->next;
}
if (latest && difftime(last_change, resolv_changed) > 0.0)
if (latest)
{
resolv_changed = last_change;
reload_servers(latest->name, daemon);
check_servers(daemon, interfaces);
check_servers(daemon);
}
}
}
#ifdef HAVE_DBUS
/* if we didn't create a DBus connection, retry now. */
if ((daemon->options & OPT_DBUS) && !daemon->dbus)
{
char *err;
if ((err = dbus_init(daemon)))
syslog(LOG_WARNING, "DBus error: %s", err);
if (daemon->dbus)
syslog(LOG_INFO, "connected to system DBus");
}
check_dbus_listeners(daemon, &rset, &wset, &eset);
#endif
check_dns_listeners(daemon, &rset, now);
if (daemon->dhcp && FD_ISSET(daemon->dhcpfd, &rset))
@@ -432,7 +505,7 @@ int main (int argc, char **argv)
}
syslog(LOG_INFO, "exiting on receipt of SIGTERM");
if (daemon->dhcp)
{
#ifdef HAVE_BROKEN_RTC
@@ -469,6 +542,21 @@ static void sig_handler(int sig)
}
}
void clear_cache_and_reload(struct daemon *daemon, time_t now)
{
cache_reload(daemon->options, daemon->namebuff, daemon->domain_suffix, daemon->addn_hosts);
if (daemon->dhcp)
{
if (daemon->options & OPT_ETHERS)
dhcp_read_ethers(daemon);
dhcp_update_configs(daemon->dhcp_conf);
lease_update_from_configs(daemon->dhcp_conf, daemon->domain_suffix);
lease_update_file(0, now);
lease_update_dns(daemon);
}
}
static int set_dns_listeners(struct daemon *daemon, fd_set *set, int maxfd)
{
struct serverfd *serverfdp;
@@ -540,7 +628,7 @@ static void check_dns_listeners(struct daemon *daemon, fd_set *set, time_t now)
#endif
else
{
char *buff;
unsigned char *buff;
struct server *s;
int flags;
@@ -649,7 +737,8 @@ int icmp_ping(struct daemon *daemon, struct in_addr addr)
struct timeval tv;
fd_set rset;
struct sockaddr_in faddr;
int maxfd, len = sizeof(faddr);
int maxfd;
socklen_t len = sizeof(faddr);
tv.tv_usec = 250000;
tv.tv_sec = 0;