src/src/routers/ipliteral.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2009 */
   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
  34 /*************************************************
  35 *          Initialization entry point            *
  36 *************************************************/
  37
  38 /* Called for each instance, after its options have been read, to enable
  39 consistency checks to be done, or anything else that needs to be set up. */
  40
  41 void
  42 ipliteral_router_init(router_instance *rblock)
  43 {
  44 /*
  45 ipliteral_router_options_block *ob =
  46   (ipliteral_router_options_block *)(rblock->options_block);
  47 */
  48 rblock = rblock;
  49 }
  50
  51
  52
  53 /*************************************************
  54 *              Main entry point                  *
  55 *************************************************/
  56
  57 /* See local README for interface details. This router returns:
  58
  59 DECLINE
  60   . the domain is not in the form of an IP literal
  61
  62 DEFER
  63   . verifying the errors address caused a deferment or a big disaster such
  64       as an expansion failure (rf_get_errors_address)
  65   . expanding a headers_{add,remove} string caused a deferment or another
  66       expansion error (rf_get_munge_headers)
  67   . a problem in rf_get_transport: no transport when one is needed;
  68       failed to expand dynamic transport; failed to find dynamic transport
  69   . failure to expand or find a uid/gid (rf_get_ugid via rf_queue_add)
  70   . self = "freeze", self = "defer"
  71
  72 PASS
  73   . self = "pass"
  74
  75 REROUTED
  76   . self = "reroute"
  77
  78 FAIL
  79   . self = "fail"
  80
  81 OK
  82   added address to addr_local or addr_remote, as appropriate for the
  83   type of transport; this includes the self="send" case.
  84 */
  85
  86 int
  87 ipliteral_router_entry(
  88   router_instance *rblock,        /* data for this instantiation */
  89   address_item *addr,             /* address we are working on */
  90   struct passwd *pw,              /* passwd entry after check_local_user */
  91   int verify,                     /* v_none/v_recipient/v_sender/v_expn */
  92   address_item **addr_local,      /* add it to this if it's local */
  93   address_item **addr_remote,     /* add it to this if it's remote */
  94   address_item **addr_new,        /* put new addresses on here */
  95   address_item **addr_succeed)    /* put old address here on success */
  96 {
  97 /*
  98 ipliteral_router_options_block *ob =
  99   (ipliteral_router_options_block *)(rblock->options_block);
 100 */
 101 host_item *h;
 102 const uschar *domain = addr->domain;
 103 const uschar *ip;
 104 int len = Ustrlen(domain);
 105 int rc, ipv;
 106
 107 addr_new = addr_new;         /* Keep picky compilers happy */
 108 addr_succeed = addr_succeed;
 109
 110 DEBUG(D_route) debug_printf("%s router called for %s: domain = %s\n",
 111   rblock->name, addr->address, addr->domain);
 112
 113 /* Check that the domain is an IP address enclosed in square brackets. Remember
 114 to allow for the "official" form of IPv6 addresses. If not, the router
 115 declines. Otherwise route to the single IP address, setting the host name to
 116 "(unnamed)". */
 117
 118 if (domain[0] != '[' || domain[len-1] != ']') return DECLINE;
 119 ip = string_copyn(domain+1, len-2);
 120 if (strncmpic(ip, US"IPV6:", 5) == 0 || strncmpic(ip, US"IPV4:", 5) == 0)
 121   ip += 5;
 122
 123 ipv = string_is_ip_address(ip, NULL);
 124 if (ipv == 0 || (disable_ipv6 && ipv == 6))
 125   return DECLINE;
 126
 127 /* It seems unlikely that ignore_target_hosts will be used with this router,
 128 but if it is set, it should probably work. */
 129
 130 if (verify_check_this_host(CUSS&rblock->ignore_target_hosts,
 131         NULL, domain, ip, NULL) == OK)
 132   {
 133   DEBUG(D_route)
 134       debug_printf("%s is in ignore_target_hosts\n", ip);
 135   addr->message = US"IP literal host explicitly ignored";
 136   return DECLINE;
 137   }
 138
 139 /* Set up a host item */
 140
 141 h = store_get(sizeof(host_item));
 142
 143 h->next = NULL;
 144 h->address = string_copy(ip);
 145 h->port = PORT_NONE;
 146 h->name = domain;
 147 h->mx = MX_NONE;
 148 h->status = hstatus_unknown;
 149 h->why = hwhy_unknown;
 150 h->last_try = 0;
 151
 152 /* Determine whether the host is the local host, and if so, take action
 153 according to the configuration. */
 154
 155 if (host_scan_for_local_hosts(h, &h, NULL) == HOST_FOUND_LOCAL)
 156   {
 157   int rc = rf_self_action(addr, h, rblock->self_code, rblock->self_rewrite,
 158     rblock->self, addr_new);
 159   if (rc != OK) return rc;
 160   }
 161
 162 /* Address is routed to this host */
 163
 164 addr->host_list = h;
 165
 166 /* Set up the errors address, if any. */
 167
 168 rc = rf_get_errors_address(addr, rblock, verify, &addr->prop.errors_address);
 169 if (rc != OK) return rc;
 170
 171 /* Set up the additional and removeable headers for this address. */
 172
 173 rc = rf_get_munge_headers(addr, rblock, &addr->prop.extra_headers,
 174   &addr->prop.remove_headers);
 175 if (rc != OK) return rc;
 176
 177 /* Fill in the transport, queue the address for local or remote delivery, and
 178 yield success. For local delivery, of course, the IP address won't be used. If
 179 just verifying, there need not be a transport, in which case it doesn't matter
 180 which queue we put the address on. This is all now handled by the route_queue()
 181 function. */
 182
 183 if (!rf_get_transport(rblock->transport_name, &(rblock->transport),
 184       addr, rblock->name, NULL))
 185   return DEFER;
 186
 187 addr->transport = rblock->transport;
 188
 189 return rf_queue_add(addr, addr_local, addr_remote, rblock, pw)?
 190   OK : DEFER;
 191 }
 192
 193 /* End of routers/ipliteral.c */