[mirror_frr.git] / pimd / pim_sock.c

/*
  PIM for Quagga
  Copyright (C) 2008  Everton da Silva Marques

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING; if not, write to the
  Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  MA 02110-1301 USA
  
  $QuaggaId: $Format:%an, %ai, %h$ $
*/

#include <zebra.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/igmp.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <errno.h>

#include "log.h"
#include "privs.h"
#include "if.h"

#include "pimd.h"
#include "pim_mroute.h"
#include "pim_sock.h"
#include "pim_str.h"
#include "pim_igmp_join.h"

/* GLOBAL VARS */
extern struct zebra_privs_t pimd_privs;

int pim_socket_raw(int protocol)
{
  int fd;

  if ( pimd_privs.change (ZPRIVS_RAISE) )
       zlog_err ("pim_sockek_raw: could not raise privs, %s",
                 safe_strerror (errno) );

  fd = socket(AF_INET, SOCK_RAW, protocol);

  if ( pimd_privs.change (ZPRIVS_LOWER) )
       zlog_err ("pim_socket_raw: could not lower privs, %s",
                 safe_strerror (errno) );

  if (fd < 0) {
    zlog_warn("Could not create raw socket: errno=%d: %s",
	      errno, safe_strerror(errno));
    return PIM_SOCK_ERR_SOCKET;
  }
  
  return fd;
}

int pim_socket_mcast(int protocol, struct in_addr ifaddr, int loop)
{
  int fd;

  fd = pim_socket_raw(protocol);
  if (fd < 0) {
    zlog_warn("Could not create multicast socket: errno=%d: %s",
	      errno, safe_strerror(errno));
    return PIM_SOCK_ERR_SOCKET;
  }

  /* Needed to obtain destination address from recvmsg() */
  {
#if defined(HAVE_IP_PKTINFO)
    /* Linux and Solaris IP_PKTINFO */
    int opt = 1;
    if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &opt, sizeof(opt))) {
      zlog_warn("Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s",
		fd, errno, safe_strerror(errno));
    }
#elif defined(HAVE_IP_RECVDSTADDR)
    /* BSD IP_RECVDSTADDR */
    int opt = 1;
    if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt))) {
      zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s",
		fd, errno, safe_strerror(errno));
    }
#else
    zlog_err("%s %s: Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()",
	     __FILE__, __PRETTY_FUNCTION__);
    close(fd);
    return PIM_SOCK_ERR_DSTADDR;
#endif
  }

  
  /* Set router alert (RFC 2113) for all IGMP messages (RFC 3376 4. Message Formats)*/
  if (protocol == IPPROTO_IGMP) {
    char ra[4];
    ra[0] = 148;
    ra[1] = 4;
    ra[2] = 0;
    ra[3] = 0;
    if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) {
      zlog_warn("Could not set Router Alert Option on socket fd=%d: errno=%d: %s",
		fd, errno, safe_strerror(errno));
      close(fd);
      return PIM_SOCK_ERR_RA;
    }
  }

  {
    int reuse = 1;
    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
		   (void *) &reuse, sizeof(reuse))) {
      zlog_warn("Could not set Reuse Address Option on socket fd=%d: errno=%d: %s",
		fd, errno, safe_strerror(errno));
      close(fd);
      return PIM_SOCK_ERR_REUSE;
    }
  }

  {
    const int MTTL = 1;
    int ttl = MTTL;
    if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL,
		   (void *) &ttl, sizeof(ttl))) {
      zlog_warn("Could not set multicast TTL=%d on socket fd=%d: errno=%d: %s",
		MTTL, fd, errno, safe_strerror(errno));
      close(fd);
      return PIM_SOCK_ERR_TTL;
    }
  }

  if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
		 (void *) &loop, sizeof(loop))) {
    zlog_warn("Could not %s Multicast Loopback Option on socket fd=%d: errno=%d: %s",
	      loop ? "enable" : "disable",
	      fd, errno, safe_strerror(errno));
    close(fd);
    return PIM_SOCK_ERR_LOOP;
  }

  if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
		 (void *) &ifaddr, sizeof(ifaddr))) {
    zlog_warn("Could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s",
	      fd, errno, safe_strerror(errno));
    close(fd);
    return PIM_SOCK_ERR_IFACE;
  }

  {
    long flags;

    flags = fcntl(fd, F_GETFL, 0);
    if (flags < 0) {
      zlog_warn("Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
		fd, errno, safe_strerror(errno));
      close(fd);
      return PIM_SOCK_ERR_NONBLOCK_GETFL;
    }

    if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) {
      zlog_warn("Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
		fd, errno, safe_strerror(errno));
      close(fd);
      return PIM_SOCK_ERR_NONBLOCK_SETFL;
    }
  }

  return fd;
}

int pim_socket_join(int fd, struct in_addr group,
		    struct in_addr ifaddr, int ifindex)
{
  int ret;

#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
  struct ip_mreqn opt;
#else
  struct ip_mreq opt;
#endif

  opt.imr_multiaddr = group;

#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
  opt.imr_address   = ifaddr;
  opt.imr_ifindex   = ifindex;
#else
  opt.imr_interface = ifaddr;
#endif

  ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &opt, sizeof(opt));
  if (ret) {
    char group_str[100];
    char ifaddr_str[100];
    if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str)))
      sprintf(group_str, "<group?>");
    if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str)))
      sprintf(ifaddr_str, "<ifaddr?>");

    zlog_err("Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s",
	     fd, group_str, ifaddr_str, errno, safe_strerror(errno));
    return ret;
  }

  if (PIM_DEBUG_TRACE) {
    char group_str[100];
    char ifaddr_str[100];
    if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str)))
      sprintf(group_str, "<group?>");
    if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str)))
      sprintf(ifaddr_str, "<ifaddr?>");

    zlog_debug("Socket fd=%d joined group %s on interface address %s",
	       fd, group_str, ifaddr_str);
  }

  return ret;
}

int pim_socket_join_source(int fd, int ifindex,
			   struct in_addr group_addr,
			   struct in_addr source_addr,
			   const char *ifname)
{
  if (pim_igmp_join_source(fd, ifindex, group_addr, source_addr)) {
    int e = errno;
    char group_str[100];
    char source_str[100];
    pim_inet4_dump("<grp?>", group_addr, group_str, sizeof(group_str));
    pim_inet4_dump("<src?>", source_addr, source_str, sizeof(source_str));
    zlog_warn("%s: setsockopt(fd=%d) failure for IGMP group %s source %s ifindex %d on interface %s: errno=%d: %s",
	      __PRETTY_FUNCTION__,
	      fd, group_str, source_str, ifindex, ifname,
	      e, safe_strerror(e));
    return -1;
  }

  return 0;
}

int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len,
			  struct sockaddr_in *from, socklen_t *fromlen,
			  struct sockaddr_in *to, socklen_t *tolen,
			  int *ifindex)
{
  struct msghdr msgh;
  struct cmsghdr *cmsg;
  struct iovec iov;
  char cbuf[1000];
  int err;

  /*
   * IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
   * Use getsockname() to get sin_port.
   */
  if (to) {
    struct sockaddr_in si;
    socklen_t si_len = sizeof(si);
    
    ((struct sockaddr_in *) to)->sin_family = AF_INET;

    if (pim_socket_getsockname(fd, (struct sockaddr *) &si, &si_len)) {
      ((struct sockaddr_in *) to)->sin_port        = ntohs(0);
      ((struct sockaddr_in *) to)->sin_addr.s_addr = ntohl(0);
    }
    else {
      ((struct sockaddr_in *) to)->sin_port = si.sin_port;
      ((struct sockaddr_in *) to)->sin_addr = si.sin_addr;
    }

    if (tolen) 
      *tolen = sizeof(si);
  }

  memset(&msgh, 0, sizeof(struct msghdr));
  iov.iov_base = buf;
  iov.iov_len  = len;
  msgh.msg_control = cbuf;
  msgh.msg_controllen = sizeof(cbuf);
  msgh.msg_name = from;
  msgh.msg_namelen = fromlen ? *fromlen : 0;
  msgh.msg_iov  = &iov;
  msgh.msg_iovlen = 1;
  msgh.msg_flags = 0;

  err = recvmsg(fd, &msgh, 0);
  if (err < 0)
    return err;

  if (fromlen)
    *fromlen = msgh.msg_namelen;

  for (cmsg = CMSG_FIRSTHDR(&msgh);
       cmsg != NULL;
       cmsg = CMSG_NXTHDR(&msgh,cmsg)) {

#ifdef HAVE_IP_PKTINFO
    if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_PKTINFO)) {
      struct in_pktinfo *i = (struct in_pktinfo *) CMSG_DATA(cmsg);
      if (to)
	((struct sockaddr_in *) to)->sin_addr = i->ipi_addr;
      if (tolen)
	*tolen = sizeof(struct sockaddr_in);
      if (ifindex)
	*ifindex = i->ipi_ifindex;

      if (to && PIM_DEBUG_PACKETS) {
	char to_str[100];
	pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str));
	zlog_debug("%s: HAVE_IP_PKTINFO to=%s,%d",
		   __PRETTY_FUNCTION__,
		   to_str, ntohs(to->sin_port));
      }

      break;
    }
#endif

#ifdef HAVE_IP_RECVDSTADDR
    if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_RECVDSTADDR)) {
      struct in_addr *i = (struct in_addr *) CMSG_DATA(cmsg);
      if (to)
	((struct sockaddr_in *) to)->sin_addr = *i;
      if (tolen)
	*tolen = sizeof(struct sockaddr_in);

      if (to && PIM_DEBUG_PACKETS) {
	char to_str[100];
	pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str));
	zlog_debug("%s: HAVE_IP_RECVDSTADDR to=%s,%d",
		   __PRETTY_FUNCTION__,
		   to_str, ntohs(to->sin_port));
      }

      break;
    }
#endif

#if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
      if (cmsg->cmsg_type == IP_RECVIF)
	if (ifindex)
	  *ifindex = CMSG_IFINDEX(cmsg);
#endif

  } /* for (cmsg) */

  return err; /* len */
}

int pim_socket_mcastloop_get(int fd)
{
  int loop;
  socklen_t loop_len = sizeof(loop);
  
  if (getsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
		 &loop, &loop_len)) {
    int e = errno;
    zlog_warn("Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s",
	      fd, errno, safe_strerror(errno));
    errno = e;
    return PIM_SOCK_ERR_LOOP;
  }
  
  return loop;
}

int pim_socket_getsockname(int fd, struct sockaddr *name, socklen_t *namelen)
{
  if (getsockname(fd, name, namelen)) {
    int e = errno;
    zlog_warn("Could not get Socket Name for socket fd=%d: errno=%d: %s",
	      fd, errno, safe_strerror(errno));
    errno = e;
    return PIM_SOCK_ERR_NAME;
  }

  return PIM_SOCK_ERR_NONE;
}
Commit	Line	Data
12e41d03 DL	1	/*
	2	PIM for Quagga
	3	Copyright (C) 2008 Everton da Silva Marques
	4
	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation; either version 2 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful, but
	11	WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program; see the file COPYING; if not, write to the
	17	Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
	18	MA 02110-1301 USA
	19
	20	$QuaggaId: $Format:%an, %ai, %h$ $
	21	*/
	22
7a2fbbf0	23	#include <zebra.h>
12e41d03 DL	24
	25	#include <sys/types.h>
	26	#include <sys/socket.h>
	27	#include <netinet/in.h>
	28	#include <netinet/igmp.h>
	29	#include <arpa/inet.h>
	30	#include <unistd.h>
	31	#include <netdb.h>
	32	#include <errno.h>
	33
12e41d03 DL	34	#include "log.h"
12e41d03 DL	35	#include "privs.h"
9df99407	36	#include "if.h"
12e41d03 DL	37
12e41d03 DL	38	#include "pimd.h"
9df99407	39	#include "pim_mroute.h"
12e41d03 DL	40	#include "pim_sock.h"
	41	#include "pim_str.h"
	42	#include "pim_igmp_join.h"
	43
	44	/* GLOBAL VARS */
	45	extern struct zebra_privs_t pimd_privs;
	46
	47	int pim_socket_raw(int protocol)
	48	{
	49	int fd;
	50
	51	if ( pimd_privs.change (ZPRIVS_RAISE) )
	52	zlog_err ("pim_sockek_raw: could not raise privs, %s",
	53	safe_strerror (errno) );
	54
	55	fd = socket(AF_INET, SOCK_RAW, protocol);
	56
	57	if ( pimd_privs.change (ZPRIVS_LOWER) )
	58	zlog_err ("pim_socket_raw: could not lower privs, %s",
	59	safe_strerror (errno) );
	60
	61	if (fd < 0) {
	62	zlog_warn("Could not create raw socket: errno=%d: %s",
	63	errno, safe_strerror(errno));
	64	return PIM_SOCK_ERR_SOCKET;
	65	}
	66
	67	return fd;
	68	}
	69
	70	int pim_socket_mcast(int protocol, struct in_addr ifaddr, int loop)
	71	{
	72	int fd;
	73
	74	fd = pim_socket_raw(protocol);
	75	if (fd < 0) {
	76	zlog_warn("Could not create multicast socket: errno=%d: %s",
	77	errno, safe_strerror(errno));
	78	return PIM_SOCK_ERR_SOCKET;
	79	}
	80
	81	/* Needed to obtain destination address from recvmsg() */
	82	{
	83	#if defined(HAVE_IP_PKTINFO)
7ec30636	84	/* Linux and Solaris IP_PKTINFO */
12e41d03	85	int opt = 1;
7ec30636	86	if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &opt, sizeof(opt))) {
12e41d03 DL	87	zlog_warn("Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s",
	88	fd, errno, safe_strerror(errno));
	89	}
	90	#elif defined(HAVE_IP_RECVDSTADDR)
	91	/* BSD IP_RECVDSTADDR */
	92	int opt = 1;
	93	if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt))) {
	94	zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s",
	95	fd, errno, safe_strerror(errno));
	96	}
	97	#else
	98	zlog_err("%s %s: Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()",
	99	__FILE__, __PRETTY_FUNCTION__);
	100	close(fd);
	101	return PIM_SOCK_ERR_DSTADDR;
	102	#endif
	103	}
	104
	105
	106	/* Set router alert (RFC 2113) for all IGMP messages (RFC 3376 4. Message Formats)*/
	107	if (protocol == IPPROTO_IGMP) {
	108	char ra[4];
	109	ra[0] = 148;
	110	ra[1] = 4;
	111	ra[2] = 0;
	112	ra[3] = 0;
	113	if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) {
	114	zlog_warn("Could not set Router Alert Option on socket fd=%d: errno=%d: %s",
	115	fd, errno, safe_strerror(errno));
	116	close(fd);
	117	return PIM_SOCK_ERR_RA;
	118	}
	119	}
	120
	121	{
	122	int reuse = 1;
	123	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
	124	(void *) &reuse, sizeof(reuse))) {
	125	zlog_warn("Could not set Reuse Address Option on socket fd=%d: errno=%d: %s",
	126	fd, errno, safe_strerror(errno));
	127	close(fd);
	128	return PIM_SOCK_ERR_REUSE;
	129	}
	130	}
	131
	132	{
	133	const int MTTL = 1;
	134	int ttl = MTTL;
	135	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL,
	136	(void *) &ttl, sizeof(ttl))) {
	137	zlog_warn("Could not set multicast TTL=%d on socket fd=%d: errno=%d: %s",
	138	MTTL, fd, errno, safe_strerror(errno));
	139	close(fd);
	140	return PIM_SOCK_ERR_TTL;
	141	}
	142	}
	143
	144	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
	145	(void *) &loop, sizeof(loop))) {
	146	zlog_warn("Could not %s Multicast Loopback Option on socket fd=%d: errno=%d: %s",
	147	loop ? "enable" : "disable",
	148	fd, errno, safe_strerror(errno));
	149	close(fd);
	150	return PIM_SOCK_ERR_LOOP;
151	}
152
153	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
154	(void *) &ifaddr, sizeof(ifaddr))) {
155	zlog_warn("Could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s",
156	fd, errno, safe_strerror(errno));
157	close(fd);
158	return PIM_SOCK_ERR_IFACE;
159	}
160
161	{
162	long flags;
163
164	flags = fcntl(fd, F_GETFL, 0);
165	if (flags < 0) {
166	zlog_warn("Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
167	fd, errno, safe_strerror(errno));
168	close(fd);
169	return PIM_SOCK_ERR_NONBLOCK_GETFL;
170	}
171
172	if (fcntl(fd, F_SETFL, flags \| O_NONBLOCK)) {
173	zlog_warn("Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
174	fd, errno, safe_strerror(errno));
175	close(fd);
176	return PIM_SOCK_ERR_NONBLOCK_SETFL;
177	}
178	}
179
180	return fd;
181	}
182
183	int pim_socket_join(int fd, struct in_addr group,
184	struct in_addr ifaddr, int ifindex)
185	{
186	int ret;
187
188	#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
189	struct ip_mreqn opt;
190	#else
191	struct ip_mreq opt;
192	#endif
193
194	opt.imr_multiaddr = group;
195
196	#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
197	opt.imr_address = ifaddr;
198	opt.imr_ifindex = ifindex;
199	#else
200	opt.imr_interface = ifaddr;
201	#endif
202
203	ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &opt, sizeof(opt));
204	if (ret) {
205	char group_str[100];
206	char ifaddr_str[100];
207	if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str)))
208	sprintf(group_str, "<group?>");
209	if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str)))
210	sprintf(ifaddr_str, "<ifaddr?>");
211
212	zlog_err("Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s",
213	fd, group_str, ifaddr_str, errno, safe_strerror(errno));
214	return ret;
215	}
216
217	if (PIM_DEBUG_TRACE) {
218	char group_str[100];
219	char ifaddr_str[100];
220	if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str)))
221	sprintf(group_str, "<group?>");
222	if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str)))
223	sprintf(ifaddr_str, "<ifaddr?>");
224
225	zlog_debug("Socket fd=%d joined group %s on interface address %s",
226	fd, group_str, ifaddr_str);
227	}
228
229	return ret;
230	}
231
232	int pim_socket_join_source(int fd, int ifindex,
233	struct in_addr group_addr,
234	struct in_addr source_addr,
235	const char *ifname)
236	{
237	if (pim_igmp_join_source(fd, ifindex, group_addr, source_addr)) {
238	int e = errno;
239	char group_str[100];
240	char source_str[100];
241	pim_inet4_dump("<grp?>", group_addr, group_str, sizeof(group_str));
242	pim_inet4_dump("<src?>", source_addr, source_str, sizeof(source_str));
243	zlog_warn("%s: setsockopt(fd=%d) failure for IGMP group %s source %s ifindex %d on interface %s: errno=%d: %s",
244	__PRETTY_FUNCTION__,
245	fd, group_str, source_str, ifindex, ifname,
246	e, safe_strerror(e));
247	return -1;
248	}
249
250	return 0;
251	}
252
253	int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len,
254	struct sockaddr_in from, socklen_t fromlen,
255	struct sockaddr_in to, socklen_t tolen,
256	int *ifindex)
257	{
258	struct msghdr msgh;
259	struct cmsghdr *cmsg;
260	struct iovec iov;
261	char cbuf[1000];
262	int err;
263
264	/*
265	* IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
266	* Use getsockname() to get sin_port.
267	*/
268	if (to) {
269	struct sockaddr_in si;
270	socklen_t si_len = sizeof(si);
271
272	((struct sockaddr_in *) to)->sin_family = AF_INET;
273
274	if (pim_socket_getsockname(fd, (struct sockaddr *) &si, &si_len)) {
275	((struct sockaddr_in *) to)->sin_port = ntohs(0);
276	((struct sockaddr_in *) to)->sin_addr.s_addr = ntohl(0);
277	}
278	else {
279	((struct sockaddr_in *) to)->sin_port = si.sin_port;
280	((struct sockaddr_in *) to)->sin_addr = si.sin_addr;
281	}
282
283	if (tolen)
284	*tolen = sizeof(si);
285	}
286
287	memset(&msgh, 0, sizeof(struct msghdr));
288	iov.iov_base = buf;
289	iov.iov_len = len;
290	msgh.msg_control = cbuf;
291	msgh.msg_controllen = sizeof(cbuf);
292	msgh.msg_name = from;
293	msgh.msg_namelen = fromlen ? *fromlen : 0;
294	msgh.msg_iov = &iov;
295	msgh.msg_iovlen = 1;
296	msgh.msg_flags = 0;
297
298	err = recvmsg(fd, &msgh, 0);
299	if (err < 0)
300	return err;
301
302	if (fromlen)
303	*fromlen = msgh.msg_namelen;
304
305	for (cmsg = CMSG_FIRSTHDR(&msgh);
306	cmsg != NULL;
307	cmsg = CMSG_NXTHDR(&msgh,cmsg)) {
308
309	#ifdef HAVE_IP_PKTINFO
7ec30636	310	if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_PKTINFO)) {
12e41d03 DL	311	struct in_pktinfo i = (struct in_pktinfo ) CMSG_DATA(cmsg);
	312	if (to)
	313	((struct sockaddr_in *) to)->sin_addr = i->ipi_addr;
	314	if (tolen)
	315	*tolen = sizeof(struct sockaddr_in);
	316	if (ifindex)
	317	*ifindex = i->ipi_ifindex;
	318
	319	if (to && PIM_DEBUG_PACKETS) {
	320	char to_str[100];
	321	pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str));
	322	zlog_debug("%s: HAVE_IP_PKTINFO to=%s,%d",
	323	__PRETTY_FUNCTION__,
	324	to_str, ntohs(to->sin_port));
	325	}
	326
	327	break;
	328	}
	329	#endif
	330
	331	#ifdef HAVE_IP_RECVDSTADDR
	332	if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_RECVDSTADDR)) {
	333	struct in_addr i = (struct in_addr ) CMSG_DATA(cmsg);
	334	if (to)
	335	((struct sockaddr_in ) to)->sin_addr = i;
	336	if (tolen)
	337	*tolen = sizeof(struct sockaddr_in);
	338
	339	if (to && PIM_DEBUG_PACKETS) {
	340	char to_str[100];
	341	pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str));
	342	zlog_debug("%s: HAVE_IP_RECVDSTADDR to=%s,%d",
	343	__PRETTY_FUNCTION__,
	344	to_str, ntohs(to->sin_port));
	345	}
	346
	347	break;
	348	}
	349	#endif
	350
	351	#if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
	352	if (cmsg->cmsg_type == IP_RECVIF)
	353	if (ifindex)
	354	*ifindex = CMSG_IFINDEX(cmsg);
	355	#endif
	356
	357	} /* for (cmsg) */
	358
	359	return err; /* len */
	360	}
	361
	362	int pim_socket_mcastloop_get(int fd)
	363	{
	364	int loop;
	365	socklen_t loop_len = sizeof(loop);
	366
	367	if (getsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
	368	&loop, &loop_len)) {
	369	int e = errno;
	370	zlog_warn("Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s",
	371	fd, errno, safe_strerror(errno));
	372	errno = e;
	373	return PIM_SOCK_ERR_LOOP;
	374	}
375
376	return loop;
377	}
378
379	int pim_socket_getsockname(int fd, struct sockaddr name, socklen_t namelen)
380	{
381	if (getsockname(fd, name, namelen)) {
382	int e = errno;
383	zlog_warn("Could not get Socket Name for socket fd=%d: errno=%d: %s",
384	fd, errno, safe_strerror(errno));
385	errno = e;
386	return PIM_SOCK_ERR_NAME;
387	}
388
389	return PIM_SOCK_ERR_NONE;
390	}