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eroute.c

/*
 * manipulate eroutes
 * Copyright (C) 1996  John Ioannidis.
 * Copyright (C) 1997, 1998, 1999, 2000, 2001  Richard Guy Briggs.
 * 
 * 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
 * 
 * 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.
 */

char eroute_c_version[] = "RCSID $Id: eroute.c,v 1.3 2005/02/24 20:03:46 as Exp $";


#include <sys/types.h>
#include <linux/types.h> /* new */
#include <string.h>
#include <errno.h>
#include <stdlib.h> /* system(), strtoul() */

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <netdb.h>


#include <unistd.h>
#include <freeswan.h>
#if 0
#include <linux/autoconf.h>   /* CONFIG_IPSEC_PFKEYv2 */
#endif
/* permanently turn it on since netlink support has been disabled */

#include <signal.h>
#include <pfkeyv2.h>
#include <pfkey.h>

#include "freeswan/radij.h"
#include "freeswan/ipsec_encap.h"

#include <stdio.h>
#include <getopt.h>

char *program_name;
char me[] = "ipsec eroute";
extern char *optarg;
extern int optind, opterr, optopt;
char *eroute_af_opt, *said_af_opt, *edst_opt, *spi_opt, *proto_opt, *said_opt, *dst_opt, *src_opt;
char *transport_proto_opt, *src_port_opt, *dst_port_opt;
int action_type = 0;

int pfkey_sock;
fd_set pfkey_socks;
uint32_t pfkey_seq = 0;

#define EMT_IFADDR        1   /* set enc if addr */
#define EMT_SETSPI        2   /* Set SPI properties */
#define EMT_DELSPI        3   /* Delete an SPI */
#define EMT_GRPSPIS       4   /* Group SPIs (output order)  */
#define EMT_SETEROUTE     5   /* set an extended route */
#define EMT_DELEROUTE     6   /* del an extended route */
#define EMT_TESTROUTE     7   /* try to find route, print to console */
#define EMT_SETDEBUG      8   /* set debug level if active */
#define EMT_UNGRPSPIS     9   /* UnGroup SPIs (output order)  */
#define EMT_CLREROUTE    10   /* clear the extended route table */
#define EMT_CLRSPIS      11   /* clear the spi table */
#define EMT_REPLACEROUTE 12   /* set an extended route */
#define EMT_GETDEBUG     13   /* get debug level if active */
#define EMT_INEROUTE     14   /* set incoming policy for IPIP on a chain */

static void
add_port(int af, ip_address * addr, short port)
{
    switch (af)
    {
    case AF_INET:
      addr->u.v4.sin_port = port;
      break;
    case AF_INET6:
      addr->u.v6.sin6_port = port;
      break;
    }
}

static void
usage(char* arg)
{
    fprintf(stdout, "usage: %s --{add,addin,replace} --eraf <inet | inet6> --src <src>/<srcmaskbits>|<srcmask> --dst <dst>/<dstmaskbits>|<dstmask> [ --transport-proto <protocol> ] [ --src-port <source-port> ] [ --dst-port <dest-port> ] <SA>\n", arg);
    fprintf(stdout, "            where <SA> is '--af <inet | inet6> --edst <edst> --spi <spi> --proto <proto>'\n");
    fprintf(stdout, "                       OR '--said <said>'\n");
    fprintf(stdout, "                       OR '--said <%%passthrough | %%passthrough4 | %%passthrough6 | %%drop | %%reject | %%trap | %%hold | %%pass>'.\n");
    fprintf(stdout, "       %s --del --eraf <inet | inet6>--src <src>/<srcmaskbits>|<srcmask> --dst <dst>/<dstmaskbits>|<dstmask> [ --transport-proto <protocol> ] [ --src-port <source-port> ] [ --dst-port <dest-port> ]\n", arg);
    fprintf(stdout, "       %s --clear\n", arg);
    fprintf(stdout, "       %s --help\n", arg);
    fprintf(stdout, "       %s --version\n", arg);
    fprintf(stdout, "       %s\n", arg);
    fprintf(stdout, "        [ --debug ] is optional to any %s command.\n", arg);
    fprintf(stdout, "        [ --label <label> ] is optional to any %s command.\n", arg);
    exit(1);
}

static struct option const longopts[] =
{
      {"dst", 1, 0, 'D'},
      {"src", 1, 0, 'S'},
      {"eraf", 1, 0, 'f'},
      {"add", 0, 0, 'a'},
      {"addin", 0, 0, 'A'},
      {"replace", 0, 0, 'r'},
      {"clear", 0, 0, 'c'},
      {"del", 0, 0, 'd'},
      {"af", 1, 0, 'i'},
      {"edst", 1, 0, 'e'},
      {"proto", 1, 0, 'p'},
      {"transport-proto", 1, 0, 'P'},
      {"src-port", 1, 0, 'Q'},
      {"dst-port", 1, 0, 'R'},
      {"help", 0, 0, 'h'},
      {"spi", 1, 0, 's'},
      {"said", 1, 0, 'I'},
      {"version", 0, 0, 'v'},
      {"label", 1, 0, 'l'},
      {"optionsfrom", 1, 0, '+'},
      {"debug", 0, 0, 'g'},
      {0, 0, 0, 0}
};

int
main(int argc, char **argv)
{
    /* int fd; */
    char *endptr;
    /* int ret; */
    int c, previous = -1;
    const char* error_s;
    int debug = 0;

    int error = 0;

    char ipaddr_txt[ADDRTOT_BUF];
    struct sadb_ext *extensions[SADB_EXT_MAX + 1];
    struct sadb_msg *pfkey_msg;
    ip_address pfkey_address_s_ska;
    /*struct sockaddr_in pfkey_address_d_ska;*/
    ip_address pfkey_address_sflow_ska;
    ip_address pfkey_address_dflow_ska;
    ip_address pfkey_address_smask_ska;
    ip_address pfkey_address_dmask_ska;

    int transport_proto = 0;
    int src_port = 0;
    int dst_port = 0;
    ip_said said;
    ip_subnet s_subnet, d_subnet;
    int eroute_af = 0;
    int said_af = 0;

    int argcount = argc;

    const char permitted_options[] =
      "%s: Only one of '--add', '--addin', '--replace', '--clear', or '--del' options permitted.\n";

    program_name = argv[0];
    eroute_af_opt = said_af_opt = edst_opt = spi_opt = proto_opt = said_opt = dst_opt = src_opt = NULL;

    while((c = getopt_long(argc, argv, ""/*"acdD:e:i:hprs:S:f:vl:+:g"*/, longopts, 0)) != EOF)
    {
      switch(c)
      {
      case 'g':
          debug = 1;
          pfkey_lib_debug = PF_KEY_DEBUG_PARSE_MAX;
          argcount--;
          break;
      case 'a':
          if (action_type)
          {
            fprintf(stderr, permitted_options, program_name);
            exit(1);
          }
          action_type = EMT_SETEROUTE;
          break;
      case 'A':
          if (action_type)
          {
            fprintf(stderr, permitted_options, program_name);
            exit(1);
          }
          action_type = EMT_INEROUTE;
          break;
      case 'r':
          if (action_type)
          {
            fprintf(stderr, permitted_options, program_name);
            exit(1);
          }
          action_type = EMT_REPLACEROUTE;
          break;
      case 'c':
          if (action_type)
          {
            fprintf(stderr, permitted_options, program_name);
            exit(1);
          }
          action_type = EMT_CLREROUTE;
          break;
      case 'd':
          if (action_type)
          {
            fprintf(stderr, permitted_options, program_name);
            exit(1);
          }
          action_type = EMT_DELEROUTE;
          break;
      case 'e':
          if (said_opt)
          {
            fprintf(stderr, "%s: Error, EDST parameter redefined:%s, already defined in SA:%s\n"
                        , program_name, optarg, said_opt);
            exit (1);
          }
          if (edst_opt)
          {
            fprintf(stderr, "%s: Error, EDST parameter redefined:%s, already defined as:%s\n"
                        , program_name, optarg, edst_opt);
            exit (1);
          }
          error_s = ttoaddr(optarg, 0, said_af, &said.dst);
          if (error_s != NULL)
          {
            fprintf(stderr, "%s: Error, %s converting --edst argument:%s\n"
                        , program_name, error_s, optarg);
            exit (1);
          }
          edst_opt = optarg;
          break;
      case 'h':
      case '?':
          usage(program_name);
          exit(1);
      case 's':
          if (said_opt)
          {
            fprintf(stderr, "%s: Error, SPI parameter redefined:%s, already defined in SA:%s\n"
                        , program_name, optarg, said_opt);
            exit (1);
          }
          if (spi_opt)
          {
            fprintf(stderr, "%s: Error, SPI parameter redefined:%s, already defined as:%s\n"
                        , program_name, optarg, spi_opt);
            exit (1);
          }
          said.spi = htonl(strtoul(optarg, &endptr, 0));
          if (!(endptr == optarg + strlen(optarg)))
          {
            fprintf(stderr, "%s: Invalid character in SPI parameter: %s\n"
                        , program_name, optarg);
            exit (1);
          }
          if (ntohl(said.spi) < 0x100)
          {
            fprintf(stderr, "%s: Illegal reserved spi: %s => 0x%x Must be larger than 0x100.\n"
                        , program_name, optarg, ntohl(said.spi));
            exit(1);
          }
          spi_opt = optarg;
          break;
      case 'p':
          if (said_opt)
          {
            fprintf(stderr, "%s: Error, PROTO parameter redefined:%s, already defined in SA:%s\n"
                        , program_name, optarg, said_opt);
            exit (1);
          }
          if (proto_opt)
          {
            fprintf(stderr, "%s: Error, PROTO parameter redefined:%s, already defined as:%s\n"
                        , program_name, optarg, proto_opt);
            exit (1);
          }
#if 0
          if (said.proto)
          {
            fprintf(stderr, "%s: Warning, PROTO parameter redefined:%s\n"
                        , program_name, optarg);
            exit (1);
          }
#endif
          if (!strcmp(optarg, "ah"))
            said.proto = SA_AH;
          if (!strcmp(optarg, "esp"))
            said.proto = SA_ESP;
          if (!strcmp(optarg, "tun"))
            said.proto = SA_IPIP;
          if (!strcmp(optarg, "comp"))
            said.proto = SA_COMP;
          if (said.proto == 0)
          {
            fprintf(stderr, "%s: Invalid PROTO parameter: %s\n"
                        , program_name, optarg);
            exit (1);
          }
          proto_opt = optarg;
          break;
      case 'I':
          if (said_opt)
          {
            fprintf(stderr, "%s: Error, SAID parameter redefined:%s, already defined in SA:%s\n"
                        , program_name, optarg, said_opt);
            exit (1);
          }
          if (proto_opt)
          {
            fprintf(stderr, "%s: Error, PROTO parameter redefined in SA:%s, already defined as:%s\n"
                        , program_name, optarg, proto_opt);
            exit (1);
          }
          if (edst_opt)
          {
            fprintf(stderr, "%s: Error, EDST parameter redefined in SA:%s, already defined as:%s\n"
                        , program_name, optarg, edst_opt);
            exit (1);
          }
          if (spi_opt)
          {
            fprintf(stderr, "%s: Error, SPI parameter redefined in SA:%s, already defined as:%s\n"
                        , program_name, optarg, spi_opt);
            exit (1);
          }
          if (said_af_opt)
          {
            fprintf(stderr, "%s: Error, address family parameter redefined in SA:%s, already defined as:%s\n"
                        , program_name, optarg, said_af_opt);
            exit (1);
          }
          error_s = ttosa(optarg, 0, &said);
          if (error_s != NULL)
          {
            fprintf(stderr, "%s: Error, %s converting --sa argument:%s\n"
                        , program_name, error_s, optarg);
            exit (1);
          }
          else if (ntohl(said.spi) < 0x100)
          {
            fprintf(stderr, "%s: Illegal reserved spi: %s => 0x%x Must be larger than or equal to 0x100.\n"
                        , program_name, optarg, said.spi);
            exit(1);
          }
          said_af = addrtypeof(&said.dst);
          said_opt = optarg;
          break;
      case 'v':
          fprintf(stdout, "%s %s\n", me, ipsec_version_code());
          fprintf(stdout, "See `ipsec --copyright' for copyright information.\n");
          exit(1);
      case 'D':
          if (dst_opt)
          {
            fprintf(stderr, "%s: Error, --dst parameter redefined:%s, already defined as:%s\n"
                        , program_name, optarg, dst_opt);
            exit (1);
          }
          error_s = ttosubnet(optarg, 0, eroute_af, &d_subnet);
          if (error_s != NULL)
          {
            fprintf(stderr, "%s: Error, %s converting --dst argument: %s\n"
                        , program_name, error_s, optarg);
            exit (1);
          }
          dst_opt = optarg;
          break;
      case 'S':
          if (src_opt)
          {
            fprintf(stderr, "%s: Error, --src parameter redefined:%s, already defined as:%s\n"
                        , program_name, optarg, src_opt);
            exit (1);
          }
          error_s = ttosubnet(optarg, 0, eroute_af, &s_subnet);
          if (error_s != NULL)
          {
            fprintf(stderr, "%s: Error, %s converting --src argument: %s\n"
                        , program_name, error_s, optarg);
            exit (1);
          }
          src_opt = optarg;
          break;
      case 'P':
          if (transport_proto_opt)
          {
            fprintf(stderr, "%s: Error, --transport-proto parameter redefined:%s, already defined as:%s\n"
                        , program_name, optarg, transport_proto_opt);
            exit(1);
          }
          transport_proto_opt = optarg;
          break;
      case 'Q':
          if (src_port_opt)
          {
            fprintf(stderr, "%s: Error, --src-port parameter redefined:%s, already defined as:%s\n"
                        , program_name, optarg, src_port_opt);
            exit(1);
          }
          src_port_opt = optarg;
          break;
      case 'R':
          if (dst_port_opt)
          {
            fprintf(stderr, "%s: Error, --dst-port parameter redefined:%s, already defined as:%s\n"
                        , program_name, optarg, dst_port_opt);
            exit(1);
          }
          dst_port_opt = optarg;
          break;
      case 'l':
          program_name = malloc(strlen(argv[0])
                  + 10 /* update this when changing the sprintf() */
                  + strlen(optarg));
          sprintf(program_name, "%s --label %s", argv[0], optarg);
          argcount -= 2;
          break;
      case 'i': /* specifies the address family of the SAID, stored in said_af */
          if (said_af_opt)
          {
            fprintf(stderr, "%s: Error, address family of SAID redefined:%s, already defined as:%s\n"
                        , program_name, optarg, said_af_opt);
            exit (1);
          }
          if (!strcmp(optarg, "inet"))
            said_af = AF_INET;
          if (!strcmp(optarg, "inet6"))
            said_af = AF_INET6;
          if (said_af == 0)
          {
            fprintf(stderr, "%s: Invalid address family parameter for SAID: %s\n"
                        , program_name, optarg);
            exit (1);
          }
          said_af_opt = optarg;
          break;
      case 'f': /* specifies the address family of the eroute, stored in eroute_af */
          if (eroute_af_opt)
          {
            fprintf(stderr, "%s: Error, address family of eroute redefined:%s, already defined as:%s\n"
                        , program_name, optarg, eroute_af_opt);
            exit (1);
          }
          if (!strcmp(optarg, "inet"))
            eroute_af = AF_INET;
          if (!strcmp(optarg, "inet6"))
            eroute_af = AF_INET6;
          if (eroute_af == 0)
          {
            fprintf(stderr, "%s: Invalid address family parameter for eroute: %s\n"
                        , program_name, optarg);
            exit (1);
          }
          eroute_af_opt = optarg;
          break;
      case '+': /* optionsfrom */
          optionsfrom(optarg, &argc, &argv, optind, stderr);
          /* no return on error */
          break;
      default:
          break;
      }
      previous = c;
    }

    if (debug)
    {
      fprintf(stdout, "%s: DEBUG: argc=%d\n", program_name, argc);
    }
      
    if (argcount == 1)
    {
      system("cat /proc/net/ipsec_eroute");
      exit(0);
    }

    /* Sanity checks */

    if (debug)
    {
      fprintf(stdout, "%s: DEBUG: action_type=%d\n", program_name, action_type);
    }

    if (transport_proto_opt != 0)
    {
      struct protoent * proto = getprotobyname(transport_proto_opt);

      if (proto != 0)
      {
          transport_proto = proto->p_proto;
      }
      else
      {
          transport_proto = strtoul(transport_proto_opt, &endptr, 0);

          if ((*endptr != '\0')
          || (transport_proto == 0 && endptr == transport_proto_opt))
          {
            fprintf(stderr, "%s: Invalid character in --transport-proto parameter: %s\n"
                        , program_name, transport_proto_opt);
            exit (1);
          }
          if (transport_proto > 255)
          {
            fprintf(stderr, "%s: --transport-proto parameter: %s must be in the range 0 to 255 inclusive\n"
                        , program_name, transport_proto_opt);
            exit (1);
          }
      }
    }

    if (src_port_opt != 0 || dst_port_opt != 0)
    {
      switch (transport_proto)
      {
      case IPPROTO_UDP:
      case IPPROTO_TCP:
          break;
      default:
          fprintf(stderr, "%s: --transport-proto with either UDP or TCP must be specified if --src-port or --dst-port is used\n"
                  , program_name);
          exit(1);
      }
    }

    if (src_port_opt)
    {
      struct servent * ent = getservbyname(src_port_opt, 0);

      if (ent != 0)
      {
          src_port = ent->s_port;
      }
      else
      {
          src_port = strtoul(src_port_opt, &endptr, 0);

          if ((*endptr != '\0')
          || (src_port == 0 && endptr == src_port_opt))
          {
            fprintf(stderr, "%s: Invalid character in --src-port parameter: %s\n"
                        , program_name, src_port_opt);
            exit (1);
          }
          if (src_port > 65535)
          {
            fprintf(stderr, "%s: --src-port parameter: %s must be in the range 0 to 65535 inclusive\n"
                        , program_name, src_port_opt);
          }
          src_port = htons(src_port);
      }
    }

    if (dst_port_opt)
    {
      struct servent * ent = getservbyname(dst_port_opt, 0);

      if (ent != 0)
      {
          dst_port = ent->s_port;
      }
      else
      {
          dst_port = strtoul(dst_port_opt, &endptr, 0);

          if ((*endptr != '\0')
          || (dst_port == 0 && endptr == dst_port_opt))
          {
            fprintf(stderr, "%s: Invalid character in --dst-port parameter: %s\n"
                        , program_name, dst_port_opt);
            exit (1);
          }
          if (dst_port > 65535)
          {
            fprintf(stderr, "%s: --dst-port parameter: %s must be in the range 0 to 65535 inclusive\n"
                        , program_name, dst_port_opt);
          }
          dst_port = htons(dst_port);
      }
    }

    switch(action_type)
    {
    case EMT_SETEROUTE:
    case EMT_REPLACEROUTE:
    case EMT_INEROUTE:
      if (!(said_af_opt && edst_opt && spi_opt && proto_opt) && !(said_opt))
      {
          fprintf(stderr, "%s: add and addin options must have SA specified.\n"
                  , program_name);
          exit(1);
      }
    case EMT_DELEROUTE:
      if (!src_opt)
      {
          fprintf(stderr, "%s: Error -- %s option '--src' is required.\n"
                  , program_name, (action_type == EMT_SETEROUTE) ? "add" : "del");
          exit(1);
      }
      if (!dst_opt)
      {
          fprintf(stderr, "%s: Error -- %s option '--dst' is required.\n"
                  , program_name, (action_type == EMT_SETEROUTE) ? "add" : "del");
          exit(1);
      }
    case EMT_CLREROUTE:
      break;
    default:
      fprintf(stderr, "%s: exactly one of '--add', '--addin', '--replace', '--del' or '--clear' options must be specified.\n"
                  "Try %s --help' for usage information.\n"
                  , program_name, program_name);
      exit(1);
    }

    if ((pfkey_sock = socket(PF_KEY, SOCK_RAW, PF_KEY_V2) ) < 0)
    {
      fprintf(stderr, "%s: Trouble opening PF_KEY family socket with error: "
                  , program_name);
      switch(errno)
      {
      case ENOENT:
          fprintf(stderr, "device does not exist.  See FreeS/WAN installation procedure.\n");
          break;
      case EACCES:
          fprintf(stderr, "access denied.  ");
          if (getuid() == 0)
          {
            fprintf(stderr, "Check permissions.  Should be 600.\n");
          }
          else
          {
            fprintf(stderr, "You must be root to open this file.\n");
          }
          break;
      case EUNATCH:
          fprintf(stderr, "KLIPS not loaded.\n");
          break;
      case ENODEV:
          fprintf(stderr, "KLIPS not loaded or enabled.\n");
          break;
      case EBUSY:
          fprintf(stderr, "KLIPS is busy.  Most likely a serious internal error occured in a previous command. "
                      "Please report as much detail as possible to development team.\n");
          break;
      case EINVAL:
          fprintf(stderr, "Invalid argument, KLIPS not loaded or check kernel log messages for specifics.\n");
          break;
      case ENOBUFS:
      case ENOMEM:
      case ENFILE:
          fprintf(stderr, "No kernel memory to allocate socket.\n");
          break;
      case EMFILE:
          fprintf(stderr, "Process file table overflow.\n");
          break;
      case ESOCKTNOSUPPORT:
          fprintf(stderr, "Socket type not supported.\n");
          break;
      case EPROTONOSUPPORT:
          fprintf(stderr, "Protocol version not supported.\n");
          break;
      case EAFNOSUPPORT:
          fprintf(stderr, "KLIPS not loaded or enabled.\n");
          break;
      default:
          fprintf(stderr, "Unknown file open error %d.  Please report as much detail as possible to development team.\n"
                  , errno);
      }
      exit(1);
    }

    if (debug)
    {
      fprintf(stdout, "%s: DEBUG: PFKEYv2 socket successfully openned=%d.\n"
                  , program_name, pfkey_sock);
    }

    /* Build an SADB_X_ADDFLOW or SADB_X_DELFLOW message to send down. */
    /* It needs <base, SA, address(SD), flow(SD), mask(SD)> minimum. */
    pfkey_extensions_init(extensions);

    error = pfkey_msg_hdr_build(&extensions[0]
            , (action_type == EMT_SETEROUTE || action_type == EMT_REPLACEROUTE
            || action_type == EMT_INEROUTE)? SADB_X_ADDFLOW : SADB_X_DELFLOW
            , proto2satype(said.proto)
            , 0
            , ++pfkey_seq
            , getpid()
          );

    if (error)
    {
      fprintf(stderr, "%s: Trouble building message header, error=%d.\n"
                  , program_name, error);
      pfkey_extensions_free(extensions);
      exit(1);
    }

    if (debug)
    {
      fprintf(stdout, "%s: DEBUG: pfkey_msg_hdr_build successfull.\n"
                  , program_name);
    }

    switch (action_type)
    {
    case EMT_SETEROUTE:
    case EMT_REPLACEROUTE:
    case EMT_INEROUTE:
    case EMT_CLREROUTE:
      error = pfkey_sa_build(&extensions[SADB_EXT_SA]
                , SADB_EXT_SA
                , said.spi /* in network order */
                , 0
                , 0
                , 0
                , 0
                , (action_type == EMT_CLREROUTE) ? SADB_X_SAFLAGS_CLEARFLOW : 0
            );

      if (error)
      {
          fprintf(stderr, "%s: Trouble building sa extension, error=%d.\n"
                  , program_name, error);
          pfkey_extensions_free(extensions);
          exit(1);
      }
      if (debug)
      {
          fprintf(stdout, "%s: DEBUG: pfkey_sa_build successful.\n"
                  , program_name);
      }
    default:
      break;
    }

    switch (action_type)
    {
    case EMT_SETEROUTE:
    case EMT_REPLACEROUTE:
    case EMT_INEROUTE:
      anyaddr(said_af, &pfkey_address_s_ska);
      error = pfkey_address_build(&extensions[SADB_EXT_ADDRESS_SRC]
                  , SADB_EXT_ADDRESS_SRC
                  , 0
                  , 0
                  , sockaddrof(&pfkey_address_s_ska)
            );
      if (error)
      {
          addrtot(&pfkey_address_s_ska, 0, ipaddr_txt, sizeof(ipaddr_txt));
          fprintf(stderr, "%s: Trouble building address_s extension (%s), error=%d.\n"
                  , program_name, ipaddr_txt, error);
          pfkey_extensions_free(extensions);
          exit(1);
      }
      if (debug)
      {
          fprintf(stdout, "%s: DEBUG: pfkey_address_build successful for src.\n"
                  , program_name);
      }

      error = pfkey_address_build(&extensions[SADB_EXT_ADDRESS_DST]
                  , SADB_EXT_ADDRESS_DST
                  , 0
                  , 0
                  , sockaddrof(&said.dst)
            );

      if (error)
      {
          addrtot(&said.dst, 0, ipaddr_txt, sizeof(ipaddr_txt));
          fprintf(stderr, "%s: Trouble building address_d extension (%s), error=%d.\n"
                  , program_name, ipaddr_txt, error);
          pfkey_extensions_free(extensions);
          exit(1);
      }
      if (debug)
      {
          fprintf(stdout, "%s: DEBUG: pfkey_address_build successful for dst.\n"
                  , program_name);
      }
    default:
      break;
    }
      
    switch (action_type)
    {
    case EMT_SETEROUTE:
    case EMT_REPLACEROUTE:
    case EMT_INEROUTE:
    case EMT_DELEROUTE:
      networkof(&s_subnet, &pfkey_address_sflow_ska); /* src flow */
      add_port(eroute_af, &pfkey_address_sflow_ska, src_port);

      error = pfkey_address_build(&extensions[SADB_X_EXT_ADDRESS_SRC_FLOW]
                  , SADB_X_EXT_ADDRESS_SRC_FLOW
                  , 0
                  , 0
                  , sockaddrof(&pfkey_address_sflow_ska)
            );

      if (error)
      {
          addrtot(&pfkey_address_sflow_ska, 0, ipaddr_txt, sizeof(ipaddr_txt));
          fprintf(stderr, "%s: Trouble building address_sflow extension (%s), error=%d.\n",
                  program_name, ipaddr_txt, error);
          pfkey_extensions_free(extensions);
          exit(1);
      }
      if (debug)
      {
          fprintf(stdout, "%s: DEBUG: pfkey_address_build successful for src flow.\n"
                  , program_name);
      }
      
      networkof(&d_subnet, &pfkey_address_dflow_ska); /* dst flow */
      add_port(eroute_af, &pfkey_address_dflow_ska, dst_port);

      error = pfkey_address_build(&extensions[SADB_X_EXT_ADDRESS_DST_FLOW]
                  , SADB_X_EXT_ADDRESS_DST_FLOW
                  , 0
                  , 0
                  , sockaddrof(&pfkey_address_dflow_ska)
            );

      if (error)
      {
          addrtot(&pfkey_address_dflow_ska, 0, ipaddr_txt, sizeof(ipaddr_txt));
          fprintf(stderr, "%s: Trouble building address_dflow extension (%s), error=%d.\n"
                  , program_name, ipaddr_txt, error);
          pfkey_extensions_free(extensions);
          exit(1);
      }
      if (debug)
      {
          fprintf(stdout, "%s: DEBUG: pfkey_address_build successful for dst flow.\n"
                  , program_name);
      }
            
      maskof(&s_subnet, &pfkey_address_smask_ska); /* src mask */
      add_port(eroute_af, &pfkey_address_smask_ska, src_port ? ~0:0);

      error = pfkey_address_build(&extensions[SADB_X_EXT_ADDRESS_SRC_MASK]
                  , SADB_X_EXT_ADDRESS_SRC_MASK
                  , 0
                  , 0
                  , sockaddrof(&pfkey_address_smask_ska)
            );

      if (error)
      {
          addrtot(&pfkey_address_smask_ska, 0, ipaddr_txt, sizeof(ipaddr_txt));
          fprintf(stderr, "%s: Trouble building address_smask extension (%s), error=%d.\n"
                  , program_name, ipaddr_txt, error);
          pfkey_extensions_free(extensions);
          exit(1);
      }
      if (debug)
      {
          fprintf(stdout, "%s: DEBUG: pfkey_address_build successful for src mask.\n"
                  , program_name);
      }
            
      maskof(&d_subnet, &pfkey_address_dmask_ska); /* dst mask */
      add_port(eroute_af, &pfkey_address_dmask_ska, dst_port ? ~0:0);

      error = pfkey_address_build(&extensions[SADB_X_EXT_ADDRESS_DST_MASK]
                  , SADB_X_EXT_ADDRESS_DST_MASK
                  , 0
                  , 0
                  , sockaddrof(&pfkey_address_dmask_ska)
            );

      if (error)
      {
          addrtot(&pfkey_address_dmask_ska, 0, ipaddr_txt, sizeof(ipaddr_txt));
          fprintf(stderr, "%s: Trouble building address_dmask extension (%s), error=%d.\n"
                  , program_name, ipaddr_txt, error);
          pfkey_extensions_free(extensions);
          exit(1);
      }
      if (debug)
      {
          fprintf(stdout, "%s: DEBUG: pfkey_address_build successful for dst mask.\n"
                  , program_name);
      }
    }
      
    if (transport_proto != 0)
    {
      error = pfkey_x_protocol_build(&extensions[SADB_X_EXT_PROTOCOL]
                  , transport_proto);
      
      if (error)
      {
          fprintf(stderr, "%s: Trouble building transport protocol extension, error=%d.\n"
                  , program_name, error);
          exit(1);
      }
    }

    error = pfkey_msg_build(&pfkey_msg, extensions, EXT_BITS_IN);
     
    if (error)
    {
      fprintf(stderr, "%s: Trouble building pfkey message, error=%d.\n"
                  , program_name, error);
      pfkey_extensions_free(extensions);
      pfkey_msg_free(&pfkey_msg);
      exit(1);
    }
    if (debug)
    {
      fprintf(stdout, "%s: DEBUG: pfkey_msg_build successful.\n"
                  , program_name);
    }

    error = write(pfkey_sock
            , pfkey_msg
            , pfkey_msg->sadb_msg_len * IPSEC_PFKEYv2_ALIGN
          )
          != (ssize_t)(pfkey_msg->sadb_msg_len * IPSEC_PFKEYv2_ALIGN);
          
    if (error)
    {
      fprintf(stderr, "%s: pfkey write failed, returning %d with errno=%d.\n"
                  , program_name, error, errno);
      pfkey_extensions_free(extensions);
      pfkey_msg_free(&pfkey_msg);

      switch (errno)
      {
      case EINVAL:
          fprintf(stderr, "Invalid argument, check kernel log messages for specifics.\n");
          break;
      case ENXIO:
          if (action_type == EMT_SETEROUTE || action_type == EMT_REPLACEROUTE)
          {
            fprintf(stderr, "Invalid mask.\n");
            break;
          }
          if (action_type == EMT_DELEROUTE)
          {
            fprintf(stderr, "Mask not found.\n");
            break;
          }
      case EFAULT:
          if (action_type == EMT_SETEROUTE || action_type == EMT_REPLACEROUTE)
          {
            fprintf(stderr, "Invalid address.\n");
            break;
          }
          if (action_type == EMT_DELEROUTE)
          {
            fprintf(stderr, "Address not found.\n");
            break;
          }
      case EACCES:
          fprintf(stderr, "access denied.  ");
          if (getuid() == 0)
          {
            fprintf(stderr, "Check permissions.  Should be 600.\n");
          }
          else 
          {
            fprintf(stderr, "You must be root to open this file.\n");
          }
          break;
      case EUNATCH:
          fprintf(stderr, "KLIPS not loaded.\n");
          break;
      case EBUSY:
          fprintf(stderr, "KLIPS is busy.  Most likely a serious internal error occured in a previous command. "
                      "Please report as much detail as possible to development team.\n");
          break;
      case ENODEV:
          fprintf(stderr, "KLIPS not loaded or enabled.\n");
          fprintf(stderr, "No device?!?\n");
          break;
      case ENOBUFS:
          fprintf(stderr, "No kernel memory to allocate SA.\n");
          break;
      case ESOCKTNOSUPPORT:
          fprintf(stderr, "Algorithm support not available in the kernel.  Please compile in support.\n");
          break;
      case EEXIST:
          fprintf(stderr, "eroute already in use.  Delete old one first.\n");
          break;
      case ENOENT:
          if (action_type == EMT_INEROUTE)
          {
            fprintf(stderr, "non-existant IPIP SA.\n");
            break;
          }
          fprintf(stderr, "eroute doesn't exist.  Can't delete.\n");
          break;
      case ENOSPC:
          fprintf(stderr, "no room in kernel SAref table.  Cannot process request.\n");
          break;
      case ESPIPE:
          fprintf(stderr, "kernel SAref table internal error.  Cannot process request.\n");
          break;
      default:
          fprintf(stderr, "Unknown socket write error %d.  Please report as much detail as possible to development team.\n"
                  , errno);
      }
/*    fprintf(stderr, "%s: socket write returned errno %d\n",
                  program_name, errno);*/
      exit(1);
    }
    if (debug)
    {
      fprintf(stdout, "%s: DEBUG: pfkey write successful.\n"
                  , program_name);
    }

    if (pfkey_msg)
    {
      pfkey_extensions_free(extensions);
      pfkey_msg_free(&pfkey_msg);
    }

    (void) close(pfkey_sock);  /* close the socket */

    if (debug)
    {
      fprintf(stdout, "%s: DEBUG: write ok\n", program_name);
    }

    exit(0);
}

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