mirror of
https://github.com/pi-hole/dnsmasq.git
synced 2025-12-19 18:28:25 +00:00
import of dnsmasq-2.41.tar.gz
This commit is contained in:
Simon Kelley
228
src/network.c
228
src/network.c
@@ -1,13 +1,17 @@
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/* dnsmasq is Copyright (c) 2000 - 2006 Simon Kelley
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/* dnsmasq is Copyright (c) 2000-2007 Simon Kelley
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 dated June, 1991.
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the Free Software Foundation; version 2 dated June, 1991, or
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(at your option) version 3 dated 29 June, 2007.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "dnsmasq.h"
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@@ -293,7 +297,7 @@ struct listener *create_wildcard_listeners(void)
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union mysockaddr addr;
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int opt = 1;
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struct listener *l, *l6 = NULL;
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int tcpfd, fd, tftpfd = -1;
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int tcpfd = -1, fd = -1, tftpfd = -1;
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memset(&addr, 0, sizeof(addr));
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addr.in.sin_family = AF_INET;
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@@ -303,28 +307,32 @@ struct listener *create_wildcard_listeners(void)
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addr.in.sin_len = sizeof(struct sockaddr_in);
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#endif
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if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1 ||
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(tcpfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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return NULL;
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if (setsockopt(tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
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bind(tcpfd, (struct sockaddr *)&addr, sa_len(&addr)) == -1 ||
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listen(tcpfd, 5) == -1 ||
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!fix_fd(tcpfd) ||
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if (daemon->port != 0)
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{
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if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1 ||
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(tcpfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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return NULL;
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if (setsockopt(tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
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bind(tcpfd, (struct sockaddr *)&addr, sa_len(&addr)) == -1 ||
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listen(tcpfd, 5) == -1 ||
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!fix_fd(tcpfd) ||
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#ifdef HAVE_IPV6
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!create_ipv6_listener(&l6, daemon->port) ||
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!create_ipv6_listener(&l6, daemon->port) ||
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#endif
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
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!fix_fd(fd) ||
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
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!fix_fd(fd) ||
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#if defined(HAVE_LINUX_NETWORK)
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setsockopt(fd, SOL_IP, IP_PKTINFO, &opt, sizeof(opt)) == -1 ||
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setsockopt(fd, SOL_IP, IP_PKTINFO, &opt, sizeof(opt)) == -1 ||
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#elif defined(IP_RECVDSTADDR) && defined(IP_RECVIF)
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setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt)) == -1 ||
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setsockopt(fd, IPPROTO_IP, IP_RECVIF, &opt, sizeof(opt)) == -1 ||
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setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt)) == -1 ||
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setsockopt(fd, IPPROTO_IP, IP_RECVIF, &opt, sizeof(opt)) == -1 ||
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#endif
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bind(fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1)
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return NULL;
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bind(fd, (struct sockaddr *)&addr, sa_len(&addr)) == -1)
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return NULL;
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}
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#ifdef HAVE_TFTP
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if (daemon->options & OPT_TFTP)
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{
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@@ -367,49 +375,52 @@ struct listener *create_bound_listeners(void)
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new->iface = iface;
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new->next = listeners;
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new->tftpfd = -1;
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new->tcpfd = -1;
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new->fd = -1;
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if ((new->tcpfd = socket(iface->addr.sa.sa_family, SOCK_STREAM, 0)) == -1 ||
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(new->fd = socket(iface->addr.sa.sa_family, SOCK_DGRAM, 0)) == -1 ||
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setsockopt(new->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
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setsockopt(new->tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
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!fix_fd(new->tcpfd) ||
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!fix_fd(new->fd))
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die(_("failed to create listening socket: %s"), NULL, EC_BADNET);
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#ifdef HAVE_IPV6
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if (iface->addr.sa.sa_family == AF_INET6)
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{
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if (setsockopt(new->fd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1 ||
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setsockopt(new->tcpfd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1)
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die(_("failed to set IPV6 options on listening socket: %s"), NULL, EC_BADNET);
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}
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#endif
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if (bind(new->tcpfd, &iface->addr.sa, sa_len(&iface->addr)) == -1 ||
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bind(new->fd, &iface->addr.sa, sa_len(&iface->addr)) == -1)
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if (daemon->port != 0)
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{
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if ((new->tcpfd = socket(iface->addr.sa.sa_family, SOCK_STREAM, 0)) == -1 ||
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(new->fd = socket(iface->addr.sa.sa_family, SOCK_DGRAM, 0)) == -1 ||
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setsockopt(new->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
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setsockopt(new->tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
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!fix_fd(new->tcpfd) ||
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!fix_fd(new->fd))
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die(_("failed to create listening socket: %s"), NULL, EC_BADNET);
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#ifdef HAVE_IPV6
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if (iface->addr.sa.sa_family == AF_INET6 && errno == ENODEV)
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if (iface->addr.sa.sa_family == AF_INET6)
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{
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close(new->tcpfd);
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close(new->fd);
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free(new);
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if (setsockopt(new->fd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1 ||
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setsockopt(new->tcpfd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1)
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die(_("failed to set IPV6 options on listening socket: %s"), NULL, EC_BADNET);
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}
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else
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#endif
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if (bind(new->tcpfd, &iface->addr.sa, sa_len(&iface->addr)) == -1 ||
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bind(new->fd, &iface->addr.sa, sa_len(&iface->addr)) == -1)
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{
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prettyprint_addr(&iface->addr, daemon->namebuff);
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die(_("failed to bind listening socket for %s: %s"),
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daemon->namebuff, EC_BADNET);
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#ifdef HAVE_IPV6
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if (iface->addr.sa.sa_family == AF_INET6 && (errno == ENODEV || errno == EADDRNOTAVAIL))
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{
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close(new->tcpfd);
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close(new->fd);
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free(new);
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new = NULL;
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}
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else
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#endif
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{
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prettyprint_addr(&iface->addr, daemon->namebuff);
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die(_("failed to bind listening socket for %s: %s"),
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daemon->namebuff, EC_BADNET);
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}
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}
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else if (listen(new->tcpfd, 5) == -1)
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die(_("failed to listen on socket: %s"), NULL, EC_BADNET);
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}
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else
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{
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listeners = new;
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if (listen(new->tcpfd, 5) == -1)
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die(_("failed to listen on socket: %s"), NULL, EC_BADNET);
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}
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#ifdef HAVE_TFTP
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if ((daemon->options & OPT_TFTP) && iface->addr.sa.sa_family == AF_INET && iface->dhcp_ok)
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{
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short save = iface->addr.in.sin_port;
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@@ -421,18 +432,51 @@ struct listener *create_bound_listeners(void)
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die(_("failed to create TFTP socket: %s"), NULL, EC_BADNET);
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iface->addr.in.sin_port = save;
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}
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#endif
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if (new)
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listeners = new;
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}
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return listeners;
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}
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struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds)
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int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp)
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{
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union mysockaddr addr_copy = *addr;
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/* cannot set source _port_ for TCP connections. */
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if (is_tcp)
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{
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if (addr_copy.sa.sa_family == AF_INET)
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addr_copy.in.sin_port = 0;
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#ifdef HAVE_IPV6
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else
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addr_copy.in6.sin6_port = 0;
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#endif
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}
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if (bind(fd, (struct sockaddr *)&addr_copy, sa_len(&addr_copy)) == -1)
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return 0;
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#if defined(SO_BINDTODEVICE)
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if (strlen(intname) != 0 &&
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setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, intname, sizeof(intname)) == -1)
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return 0;
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#endif
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return 1;
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}
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static struct serverfd *allocate_sfd(union mysockaddr *addr, char *intname)
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{
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struct serverfd *sfd;
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int errsave;
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/* may have a suitable one already */
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for (sfd = *sfds; sfd; sfd = sfd->next )
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if (sockaddr_isequal(&sfd->source_addr, addr))
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for (sfd = daemon->sfds; sfd; sfd = sfd->next )
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if (sockaddr_isequal(&sfd->source_addr, addr) &&
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strcmp(intname, sfd->interface) == 0)
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return sfd;
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/* need to make a new one. */
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@@ -446,23 +490,68 @@ struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds)
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return NULL;
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}
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if (bind(sfd->fd, (struct sockaddr *)addr, sa_len(addr)) == -1 ||
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!fix_fd(sfd->fd))
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{
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int errsave = errno; /* save error from bind. */
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if (!local_bind(sfd->fd, addr, intname, 0) || !fix_fd(sfd->fd))
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{
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errsave = errno; /* save error from bind. */
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close(sfd->fd);
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free(sfd);
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errno = errsave;
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return NULL;
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}
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strcpy(sfd->interface, intname);
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sfd->source_addr = *addr;
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sfd->next = *sfds;
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*sfds = sfd;
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return sfd;
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sfd->next = daemon->sfds;
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daemon->sfds = sfd;
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return sfd;
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}
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/* create upstream sockets during startup, before root is dropped which may be needed
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this allows query_port to be a low port and interface binding */
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void pre_allocate_sfds(void)
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{
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struct server *srv;
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if (daemon->query_port != 0)
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{
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union mysockaddr addr;
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memset(&addr, 0, sizeof(addr));
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addr.in.sin_family = AF_INET;
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addr.in.sin_addr.s_addr = INADDR_ANY;
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addr.in.sin_port = htons(daemon->query_port);
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#ifdef HAVE_SOCKADDR_SA_LEN
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addr.in.sin_len = sizeof(struct sockaddr_in);
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#endif
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allocate_sfd(&addr, "");
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#ifdef HAVE_IPV6
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memset(&addr, 0, sizeof(addr));
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addr.in6.sin6_family = AF_INET6;
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addr.in6.sin6_addr = in6addr_any;
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addr.in6.sin6_port = htons(daemon->query_port);
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#ifdef HAVE_SOCKADDR_SA_LEN
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addr.in6.sin6_len = sizeof(struct sockaddr_in6);
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#endif
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allocate_sfd(&addr, "");
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#endif
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}
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for (srv = daemon->servers; srv; srv = srv->next)
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if (!(srv->flags & (SERV_LITERAL_ADDRESS | SERV_NO_ADDR)) &&
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!allocate_sfd(&srv->source_addr, srv->interface) &&
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(daemon->options & OPT_NOWILD))
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{
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prettyprint_addr(&srv->addr, daemon->namebuff);
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if (strlen(srv->interface) != 0)
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{
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strcat(daemon->namebuff, " ");
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strcat(daemon->namebuff, srv->interface);
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}
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die(_("failed to bind server socket for %s: %s"),
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daemon->namebuff, EC_BADNET);
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}
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}
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void check_servers(void)
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{
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struct irec *iface;
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@@ -496,7 +585,7 @@ void check_servers(void)
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}
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/* Do we need a socket set? */
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if (!new->sfd && !(new->sfd = allocate_sfd(&new->source_addr, &daemon->sfds)))
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if (!new->sfd && !(new->sfd = allocate_sfd(&new->source_addr, new->interface)))
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{
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my_syslog(LOG_WARNING,
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_("ignoring nameserver %s - cannot make/bind socket: %s"),
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@@ -525,6 +614,8 @@ void check_servers(void)
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else if (!(new->flags & SERV_LITERAL_ADDRESS))
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my_syslog(LOG_INFO, _("using nameserver %s#%d for %s %s"), daemon->namebuff, port, s1, s2);
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}
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else if (strlen(new->interface) != 0)
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my_syslog(LOG_INFO, _("using nameserver %s#%d(via %s)"), daemon->namebuff, port, new->interface);
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else
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my_syslog(LOG_INFO, _("using nameserver %s#%d"), daemon->namebuff, port);
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}
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@@ -626,9 +717,10 @@ int reload_servers(char *fname)
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serv->addr = addr;
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serv->source_addr = source_addr;
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serv->domain = NULL;
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serv->interface[0] = 0;
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serv->sfd = NULL;
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serv->flags = SERV_FROM_RESOLV;
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serv->queries = serv->failed_queries = 0;
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gotone = 1;
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}
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