[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 "vrf.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 ifindex, 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;
  }

  if (protocol == IPPROTO_PIM)
    {
      int ret;
      struct interface *ifp = NULL;

      ifp = if_lookup_by_index_vrf (ifindex, VRF_DEFAULT);

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

      ret = setsockopt (fd, SOL_SOCKET,
			SO_BINDTODEVICE, ifp->name, strlen (ifp->name));

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

      if (ret)
	{
	  zlog_warn("Could not set fd: %d for interface: %s to device",
		    fd, ifp->name);
	  return PIM_SOCK_ERR_BIND;
	}
    }


  /* 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"
61ea3951	37	#include "vrf.h"
12e41d03 DL	38
12e41d03 DL	39	#include "pimd.h"
9df99407	40	#include "pim_mroute.h"
12e41d03 DL	41	#include "pim_sock.h"
	42	#include "pim_str.h"
	43	#include "pim_igmp_join.h"
	44
	45	/* GLOBAL VARS */
	46	extern struct zebra_privs_t pimd_privs;
	47
	48	int pim_socket_raw(int protocol)
	49	{
	50	int fd;
	51
	52	if ( pimd_privs.change (ZPRIVS_RAISE) )
	53	zlog_err ("pim_sockek_raw: could not raise privs, %s",
	54	safe_strerror (errno) );
	55
	56	fd = socket(AF_INET, SOCK_RAW, protocol);
	57
	58	if ( pimd_privs.change (ZPRIVS_LOWER) )
	59	zlog_err ("pim_socket_raw: could not lower privs, %s",
	60	safe_strerror (errno) );
	61
	62	if (fd < 0) {
	63	zlog_warn("Could not create raw socket: errno=%d: %s",
	64	errno, safe_strerror(errno));
	65	return PIM_SOCK_ERR_SOCKET;
	66	}
	67
	68	return fd;
	69	}
	70
61ea3951	71	int pim_socket_mcast(int protocol, struct in_addr ifaddr, int ifindex, int loop)
12e41d03 DL	72	{
	73	int fd;
	74
	75	fd = pim_socket_raw(protocol);
	76	if (fd < 0) {
	77	zlog_warn("Could not create multicast socket: errno=%d: %s",
	78	errno, safe_strerror(errno));
	79	return PIM_SOCK_ERR_SOCKET;
	80	}
	81
61ea3951 DS	82	if (protocol == IPPROTO_PIM)
	83	{
	84	int ret;
	85	struct interface *ifp = NULL;
	86
	87	ifp = if_lookup_by_index_vrf (ifindex, VRF_DEFAULT);
	88
	89	if (pimd_privs.change (ZPRIVS_RAISE))
	90	zlog_err ("%s: could not raise privs, %s",
	91	__PRETTY_FUNCTION__, safe_strerror (errno));
	92
	93	ret = setsockopt (fd, SOL_SOCKET,
	94	SO_BINDTODEVICE, ifp->name, strlen (ifp->name));
	95
	96	if (pimd_privs.change (ZPRIVS_LOWER))
	97	zlog_err ("%s: could not lower privs, %s",
	98	__PRETTY_FUNCTION__, safe_strerror (errno));
	99
	100	if (ret)
	101	{
	102	zlog_warn("Could not set fd: %d for interface: %s to device",
	103	fd, ifp->name);
	104	return PIM_SOCK_ERR_BIND;
	105	}
	106	}
	107
	108
12e41d03 DL	109	/* Needed to obtain destination address from recvmsg() */
	110	{
	111	#if defined(HAVE_IP_PKTINFO)
7ec30636	112	/* Linux and Solaris IP_PKTINFO */
12e41d03	113	int opt = 1;
7ec30636	114	if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &opt, sizeof(opt))) {
12e41d03 DL	115	zlog_warn("Could not set IP_PKTINFO on socket fd=%d: errno=%d: %s",
	116	fd, errno, safe_strerror(errno));
	117	}
	118	#elif defined(HAVE_IP_RECVDSTADDR)
	119	/* BSD IP_RECVDSTADDR */
	120	int opt = 1;
	121	if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt))) {
	122	zlog_warn("Could not set IP_RECVDSTADDR on socket fd=%d: errno=%d: %s",
	123	fd, errno, safe_strerror(errno));
	124	}
	125	#else
	126	zlog_err("%s %s: Missing IP_PKTINFO and IP_RECVDSTADDR: unable to get dst addr from recvmsg()",
	127	__FILE__, __PRETTY_FUNCTION__);
	128	close(fd);
	129	return PIM_SOCK_ERR_DSTADDR;
	130	#endif
	131	}
	132
	133
	134	/* Set router alert (RFC 2113) for all IGMP messages (RFC 3376 4. Message Formats)*/
	135	if (protocol == IPPROTO_IGMP) {
	136	char ra[4];
	137	ra[0] = 148;
	138	ra[1] = 4;
	139	ra[2] = 0;
	140	ra[3] = 0;
	141	if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, ra, 4)) {
	142	zlog_warn("Could not set Router Alert Option on socket fd=%d: errno=%d: %s",
	143	fd, errno, safe_strerror(errno));
	144	close(fd);
	145	return PIM_SOCK_ERR_RA;
	146	}
	147	}
	148
	149	{
	150	int reuse = 1;
	151	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
	152	(void *) &reuse, sizeof(reuse))) {
	153	zlog_warn("Could not set Reuse Address Option on socket fd=%d: errno=%d: %s",
	154	fd, errno, safe_strerror(errno));
	155	close(fd);
	156	return PIM_SOCK_ERR_REUSE;
	157	}
	158	}
	159
	160	{
	161	const int MTTL = 1;
	162	int ttl = MTTL;
	163	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL,
	164	(void *) &ttl, sizeof(ttl))) {
	165	zlog_warn("Could not set multicast TTL=%d on socket fd=%d: errno=%d: %s",
	166	MTTL, fd, errno, safe_strerror(errno));
	167	close(fd);
	168	return PIM_SOCK_ERR_TTL;
	169	}
	170	}
	171
	172	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
	173	(void *) &loop, sizeof(loop))) {
	174	zlog_warn("Could not %s Multicast Loopback Option on socket fd=%d: errno=%d: %s",
	175	loop ? "enable" : "disable",
	176	fd, errno, safe_strerror(errno));
	177	close(fd);
	178	return PIM_SOCK_ERR_LOOP;
179	}
180
181	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
182	(void *) &ifaddr, sizeof(ifaddr))) {
183	zlog_warn("Could not set Outgoing Interface Option on socket fd=%d: errno=%d: %s",
184	fd, errno, safe_strerror(errno));
185	close(fd);
186	return PIM_SOCK_ERR_IFACE;
187	}
188
189	{
190	long flags;
191
192	flags = fcntl(fd, F_GETFL, 0);
193	if (flags < 0) {
194	zlog_warn("Could not get fcntl(F_GETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
195	fd, errno, safe_strerror(errno));
196	close(fd);
197	return PIM_SOCK_ERR_NONBLOCK_GETFL;
198	}
199
200	if (fcntl(fd, F_SETFL, flags \| O_NONBLOCK)) {
201	zlog_warn("Could not set fcntl(F_SETFL,O_NONBLOCK) on socket fd=%d: errno=%d: %s",
202	fd, errno, safe_strerror(errno));
203	close(fd);
204	return PIM_SOCK_ERR_NONBLOCK_SETFL;
205	}
206	}
207
208	return fd;
209	}
210
211	int pim_socket_join(int fd, struct in_addr group,
212	struct in_addr ifaddr, int ifindex)
213	{
214	int ret;
215
216	#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
217	struct ip_mreqn opt;
218	#else
219	struct ip_mreq opt;
220	#endif
221
222	opt.imr_multiaddr = group;
223
224	#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
225	opt.imr_address = ifaddr;
226	opt.imr_ifindex = ifindex;
227	#else
228	opt.imr_interface = ifaddr;
229	#endif
230
231	ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &opt, sizeof(opt));
232	if (ret) {
233	char group_str[100];
234	char ifaddr_str[100];
235	if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str)))
236	sprintf(group_str, "<group?>");
237	if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str)))
238	sprintf(ifaddr_str, "<ifaddr?>");
239
240	zlog_err("Failure socket joining fd=%d group %s on interface address %s: errno=%d: %s",
241	fd, group_str, ifaddr_str, errno, safe_strerror(errno));
242	return ret;
243	}
244
245	if (PIM_DEBUG_TRACE) {
246	char group_str[100];
247	char ifaddr_str[100];
248	if (!inet_ntop(AF_INET, &group, group_str , sizeof(group_str)))
249	sprintf(group_str, "<group?>");
250	if (!inet_ntop(AF_INET, &ifaddr, ifaddr_str , sizeof(ifaddr_str)))
251	sprintf(ifaddr_str, "<ifaddr?>");
252
253	zlog_debug("Socket fd=%d joined group %s on interface address %s",
254	fd, group_str, ifaddr_str);
255	}
256
257	return ret;
258	}
259
260	int pim_socket_join_source(int fd, int ifindex,
261	struct in_addr group_addr,
262	struct in_addr source_addr,
263	const char *ifname)
264	{
265	if (pim_igmp_join_source(fd, ifindex, group_addr, source_addr)) {
266	int e = errno;
267	char group_str[100];
268	char source_str[100];
269	pim_inet4_dump("<grp?>", group_addr, group_str, sizeof(group_str));
270	pim_inet4_dump("<src?>", source_addr, source_str, sizeof(source_str));
271	zlog_warn("%s: setsockopt(fd=%d) failure for IGMP group %s source %s ifindex %d on interface %s: errno=%d: %s",
272	__PRETTY_FUNCTION__,
273	fd, group_str, source_str, ifindex, ifname,
274	e, safe_strerror(e));
275	return -1;
276	}
277
278	return 0;
279	}
280
281	int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len,
282	struct sockaddr_in from, socklen_t fromlen,
283	struct sockaddr_in to, socklen_t tolen,
284	int *ifindex)
285	{
286	struct msghdr msgh;
287	struct cmsghdr *cmsg;
288	struct iovec iov;
289	char cbuf[1000];
290	int err;
291
292	/*
293	* IP_PKTINFO / IP_RECVDSTADDR don't yield sin_port.
294	* Use getsockname() to get sin_port.
295	*/
296	if (to) {
297	struct sockaddr_in si;
298	socklen_t si_len = sizeof(si);
299
300	((struct sockaddr_in *) to)->sin_family = AF_INET;
301
302	if (pim_socket_getsockname(fd, (struct sockaddr *) &si, &si_len)) {
303	((struct sockaddr_in *) to)->sin_port = ntohs(0);
304	((struct sockaddr_in *) to)->sin_addr.s_addr = ntohl(0);
305	}
306	else {
307	((struct sockaddr_in *) to)->sin_port = si.sin_port;
308	((struct sockaddr_in *) to)->sin_addr = si.sin_addr;
309	}
310
311	if (tolen)
312	*tolen = sizeof(si);
313	}
314
315	memset(&msgh, 0, sizeof(struct msghdr));
316	iov.iov_base = buf;
317	iov.iov_len = len;
318	msgh.msg_control = cbuf;
319	msgh.msg_controllen = sizeof(cbuf);
320	msgh.msg_name = from;
321	msgh.msg_namelen = fromlen ? *fromlen : 0;
322	msgh.msg_iov = &iov;
323	msgh.msg_iovlen = 1;
324	msgh.msg_flags = 0;
325
326	err = recvmsg(fd, &msgh, 0);
327	if (err < 0)
328	return err;
329
330	if (fromlen)
331	*fromlen = msgh.msg_namelen;
332
333	for (cmsg = CMSG_FIRSTHDR(&msgh);
334	cmsg != NULL;
335	cmsg = CMSG_NXTHDR(&msgh,cmsg)) {
336
337	#ifdef HAVE_IP_PKTINFO
7ec30636	338	if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_PKTINFO)) {
12e41d03 DL	339	struct in_pktinfo i = (struct in_pktinfo ) CMSG_DATA(cmsg);
	340	if (to)
	341	((struct sockaddr_in *) to)->sin_addr = i->ipi_addr;
	342	if (tolen)
	343	*tolen = sizeof(struct sockaddr_in);
	344	if (ifindex)
	345	*ifindex = i->ipi_ifindex;
	346
	347	if (to && PIM_DEBUG_PACKETS) {
	348	char to_str[100];
	349	pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str));
	350	zlog_debug("%s: HAVE_IP_PKTINFO to=%s,%d",
	351	__PRETTY_FUNCTION__,
	352	to_str, ntohs(to->sin_port));
	353	}
	354
	355	break;
	356	}
	357	#endif
	358
	359	#ifdef HAVE_IP_RECVDSTADDR
	360	if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_RECVDSTADDR)) {
	361	struct in_addr i = (struct in_addr ) CMSG_DATA(cmsg);
	362	if (to)
	363	((struct sockaddr_in ) to)->sin_addr = i;
	364	if (tolen)
	365	*tolen = sizeof(struct sockaddr_in);
	366
	367	if (to && PIM_DEBUG_PACKETS) {
	368	char to_str[100];
	369	pim_inet4_dump("<to?>", to->sin_addr, to_str, sizeof(to_str));
	370	zlog_debug("%s: HAVE_IP_RECVDSTADDR to=%s,%d",
	371	__PRETTY_FUNCTION__,
	372	to_str, ntohs(to->sin_port));
	373	}
	374
	375	break;
	376	}
	377	#endif
	378
	379	#if defined(HAVE_IP_RECVIF) && defined(CMSG_IFINDEX)
	380	if (cmsg->cmsg_type == IP_RECVIF)
	381	if (ifindex)
	382	*ifindex = CMSG_IFINDEX(cmsg);
	383	#endif
	384
	385	} /* for (cmsg) */
	386
	387	return err; /* len */
	388	}
	389
	390	int pim_socket_mcastloop_get(int fd)
	391	{
	392	int loop;
	393	socklen_t loop_len = sizeof(loop);
	394
	395	if (getsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
	396	&loop, &loop_len)) {
	397	int e = errno;
	398	zlog_warn("Could not get Multicast Loopback Option on socket fd=%d: errno=%d: %s",
	399	fd, errno, safe_strerror(errno));
	400	errno = e;
	401	return PIM_SOCK_ERR_LOOP;
	402	}
403
404	return loop;
405	}
406
407	int pim_socket_getsockname(int fd, struct sockaddr name, socklen_t namelen)
408	{
409	if (getsockname(fd, name, namelen)) {
410	int e = errno;
411	zlog_warn("Could not get Socket Name for socket fd=%d: errno=%d: %s",
412	fd, errno, safe_strerror(errno));
413	errno = e;
414	return PIM_SOCK_ERR_NAME;
415	}
416
417	return PIM_SOCK_ERR_NONE;
418	}