[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 "pim_mroute.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 <zebra.h>
#include "log.h"
#include "privs.h"

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