src/src/routers/ipliteral.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8
   9 #include "../exim.h"
  10 #include "rf_functions.h"
  11 #include "ipliteral.h"
  12
  13
  14 /* Options specific to the ipliteral router. Because some compilers do not like
  15 empty declarations ("undefined" in the Standard) we put in a dummy value. */
  16
  17 optionlist ipliteral_router_options[] = {
  18   { "", opt_hidden, NULL }
  19 };
  20
  21 /* Size of the options list. An extern variable has to be used so that its
  22 address can appear in the tables drtables.c. */
  23
  24 int ipliteral_router_options_count =
  25   sizeof(ipliteral_router_options)/sizeof(optionlist);
  26
  27 /* Default private options block for the ipliteral router. Again, a dummy
  28 value is present to keep some compilers happy. */
  29
  30 ipliteral_router_options_block ipliteral_router_option_defaults = { 0 };
  31
  32
  33 #ifdef MACRO_PREDEF
  34
  35 /* Dummy entries */
  36 void ipliteral_router_init(router_instance *rblock) {}
  37 int ipliteral_router_entry(router_instance *rblock, address_item *addr,
  38   struct passwd *pw, int verify, address_item **addr_local,
  39   address_item **addr_remote, address_item **addr_new,
  40   address_item **addr_succeed) {return 0;}
  41
  42 #else   /*!MACRO_PREDEF*/
  43
  44
  45 /*************************************************
  46 *          Initialization entry point            *
  47 *************************************************/
  48
  49 /* Called for each instance, after its options have been read, to enable
  50 consistency checks to be done, or anything else that needs to be set up. */
  51
  52 void
  53 ipliteral_router_init(router_instance *rblock)
  54 {
  55 /*
  56 ipliteral_router_options_block *ob =
  57   (ipliteral_router_options_block *)(rblock->options_block);
  58 */
  59 rblock = rblock;
  60 }
  61
  62
  63
  64 /*************************************************
  65 *              Main entry point                  *
  66 *************************************************/
  67
  68 /* See local README for interface details. This router returns:
  69
  70 DECLINE
  71   . the domain is not in the form of an IP literal
  72
  73 DEFER
  74   . verifying the errors address caused a deferment or a big disaster such
  75       as an expansion failure (rf_get_errors_address)
  76   . expanding a headers_{add,remove} string caused a deferment or another
  77       expansion error (rf_get_munge_headers)
  78   . a problem in rf_get_transport: no transport when one is needed;
  79       failed to expand dynamic transport; failed to find dynamic transport
  80   . failure to expand or find a uid/gid (rf_get_ugid via rf_queue_add)
  81   . self = "freeze", self = "defer"
  82
  83 PASS
  84   . self = "pass"
  85
  86 REROUTED
  87   . self = "reroute"
  88
  89 FAIL
  90   . self = "fail"
  91
  92 OK
  93   added address to addr_local or addr_remote, as appropriate for the
  94   type of transport; this includes the self="send" case.
  95 */
  96
  97 int
  98 ipliteral_router_entry(
  99   router_instance *rblock,        /* data for this instantiation */
 100   address_item *addr,             /* address we are working on */
 101   struct passwd *pw,              /* passwd entry after check_local_user */
 102   int verify,                     /* v_none/v_recipient/v_sender/v_expn */
 103   address_item **addr_local,      /* add it to this if it's local */
 104   address_item **addr_remote,     /* add it to this if it's remote */
 105   address_item **addr_new,        /* put new addresses on here */
 106   address_item **addr_succeed)    /* put old address here on success */
 107 {
 108 /*
 109 ipliteral_router_options_block *ob =
 110   (ipliteral_router_options_block *)(rblock->options_block);
 111 */
 112 host_item *h;
 113 const uschar *domain = addr->domain;
 114 const uschar *ip;
 115 int len = Ustrlen(domain);
 116 int rc, ipv;
 117
 118 addr_new = addr_new;         /* Keep picky compilers happy */
 119 addr_succeed = addr_succeed;
 120
 121 DEBUG(D_route) debug_printf("%s router called for %s: domain = %s\n",
 122   rblock->name, addr->address, addr->domain);
 123
 124 /* Check that the domain is an IP address enclosed in square brackets. Remember
 125 to allow for the "official" form of IPv6 addresses. If not, the router
 126 declines. Otherwise route to the single IP address, setting the host name to
 127 "(unnamed)". */
 128
 129 if (domain[0] != '[' || domain[len-1] != ']') return DECLINE;
 130 ip = string_copyn(domain+1, len-2);
 131 if (strncmpic(ip, US"IPV6:", 5) == 0 || strncmpic(ip, US"IPV4:", 5) == 0)
 132   ip += 5;
 133
 134 ipv = string_is_ip_address(ip, NULL);
 135 if (ipv == 0 || (disable_ipv6 && ipv == 6))
 136   return DECLINE;
 137
 138 /* It seems unlikely that ignore_target_hosts will be used with this router,
 139 but if it is set, it should probably work. */
 140
 141 if (verify_check_this_host(CUSS&rblock->ignore_target_hosts,
 142         NULL, domain, ip, NULL) == OK)
 143   {
 144   DEBUG(D_route)
 145       debug_printf("%s is in ignore_target_hosts\n", ip);
 146   addr->message = US"IP literal host explicitly ignored";
 147   return DECLINE;
 148   }
 149
 150 /* Set up a host item */
 151
 152 h = store_get(sizeof(host_item), FALSE);
 153
 154 h->next = NULL;
 155 h->address = string_copy(ip);
 156 h->port = PORT_NONE;
 157 h->name = domain;
 158 h->mx = MX_NONE;
 159 h->status = hstatus_unknown;
 160 h->why = hwhy_unknown;
 161 h->last_try = 0;
 162
 163 /* Determine whether the host is the local host, and if so, take action
 164 according to the configuration. */
 165
 166 if (host_scan_for_local_hosts(h, &h, NULL) == HOST_FOUND_LOCAL)
 167   {
 168   int rc = rf_self_action(addr, h, rblock->self_code, rblock->self_rewrite,
 169     rblock->self, addr_new);
 170   if (rc != OK) return rc;
 171   }
 172
 173 /* Address is routed to this host */
 174
 175 addr->host_list = h;
 176
 177 /* Set up the errors address, if any. */
 178
 179 rc = rf_get_errors_address(addr, rblock, verify, &addr->prop.errors_address);
 180 if (rc != OK) return rc;
 181
 182 /* Set up the additional and removable headers for this address. */
 183
 184 rc = rf_get_munge_headers(addr, rblock, &addr->prop.extra_headers,
 185   &addr->prop.remove_headers);
 186 if (rc != OK) return rc;
 187
 188 /* Fill in the transport, queue the address for local or remote delivery, and
 189 yield success. For local delivery, of course, the IP address won't be used. If
 190 just verifying, there need not be a transport, in which case it doesn't matter
 191 which queue we put the address on. This is all now handled by the route_queue()
 192 function. */
 193
 194 if (!rf_get_transport(rblock->transport_name, &(rblock->transport),
 195       addr, rblock->name, NULL))
 196   return DEFER;
 197
 198 addr->transport = rblock->transport;
 199
 200 return rf_queue_add(addr, addr_local, addr_remote, rblock, pw)?
 201   OK : DEFER;
 202 }
 203
 204 #endif   /*!MACRO_PREDEF*/
 205 /* End of routers/ipliteral.c */