src/src/routers/ipliteral.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* Copyright (c) The Exim Maintainers 2020 */
   7 /* See the file NOTICE for conditions of use and distribution. */
   8
   9
  10 #include "../exim.h"
  11 #include "rf_functions.h"
  12 #include "ipliteral.h"
  13
  14
  15 /* Options specific to the ipliteral router. Because some compilers do not like
  16 empty declarations ("undefined" in the Standard) we put in a dummy value. */
  17
  18 optionlist ipliteral_router_options[] = {
  19   { "", opt_hidden, {NULL} }
  20 };
  21
  22 /* Size of the options list. An extern variable has to be used so that its
  23 address can appear in the tables drtables.c. */
  24
  25 int ipliteral_router_options_count =
  26   sizeof(ipliteral_router_options)/sizeof(optionlist);
  27
  28 /* Default private options block for the ipliteral router. Again, a dummy
  29 value is present to keep some compilers happy. */
  30
  31 ipliteral_router_options_block ipliteral_router_option_defaults = { 0 };
  32
  33
  34 #ifdef MACRO_PREDEF
  35
  36 /* Dummy entries */
  37 void ipliteral_router_init(router_instance *rblock) {}
  38 int ipliteral_router_entry(router_instance *rblock, address_item *addr,
  39   struct passwd *pw, int verify, address_item **addr_local,
  40   address_item **addr_remote, address_item **addr_new,
  41   address_item **addr_succeed) {return 0;}
  42
  43 #else   /*!MACRO_PREDEF*/
  44
  45
  46 /*************************************************
  47 *          Initialization entry point            *
  48 *************************************************/
  49
  50 /* Called for each instance, after its options have been read, to enable
  51 consistency checks to be done, or anything else that needs to be set up. */
  52
  53 void
  54 ipliteral_router_init(router_instance *rblock)
  55 {
  56 /*
  57 ipliteral_router_options_block *ob =
  58   (ipliteral_router_options_block *)(rblock->options_block);
  59 */
  60 rblock = rblock;
  61 }
  62
  63
  64
  65 /*************************************************
  66 *              Main entry point                  *
  67 *************************************************/
  68
  69 /* See local README for interface details. This router returns:
  70
  71 DECLINE
  72   . the domain is not in the form of an IP literal
  73
  74 DEFER
  75   . verifying the errors address caused a deferment or a big disaster such
  76       as an expansion failure (rf_get_errors_address)
  77   . expanding a headers_{add,remove} string caused a deferment or another
  78       expansion error (rf_get_munge_headers)
  79   . a problem in rf_get_transport: no transport when one is needed;
  80       failed to expand dynamic transport; failed to find dynamic transport
  81   . failure to expand or find a uid/gid (rf_get_ugid via rf_queue_add)
  82   . self = "freeze", self = "defer"
  83
  84 PASS
  85   . self = "pass"
  86
  87 REROUTED
  88   . self = "reroute"
  89
  90 FAIL
  91   . self = "fail"
  92
  93 OK
  94   added address to addr_local or addr_remote, as appropriate for the
  95   type of transport; this includes the self="send" case.
  96 */
  97
  98 int
  99 ipliteral_router_entry(
 100   router_instance *rblock,        /* data for this instantiation */
 101   address_item *addr,             /* address we are working on */
 102   struct passwd *pw,              /* passwd entry after check_local_user */
 103   int verify,                     /* v_none/v_recipient/v_sender/v_expn */
 104   address_item **addr_local,      /* add it to this if it's local */
 105   address_item **addr_remote,     /* add it to this if it's remote */
 106   address_item **addr_new,        /* put new addresses on here */
 107   address_item **addr_succeed)    /* put old address here on success */
 108 {
 109 /*
 110 ipliteral_router_options_block *ob =
 111   (ipliteral_router_options_block *)(rblock->options_block);
 112 */
 113 host_item *h;
 114 const uschar *domain = addr->domain;
 115 const uschar *ip;
 116 int len = Ustrlen(domain);
 117 int rc, ipv;
 118
 119 addr_new = addr_new;         /* Keep picky compilers happy */
 120 addr_succeed = addr_succeed;
 121
 122 DEBUG(D_route) debug_printf("%s router called for %s: domain = %s\n",
 123   rblock->name, addr->address, addr->domain);
 124
 125 /* Check that the domain is an IP address enclosed in square brackets. Remember
 126 to allow for the "official" form of IPv6 addresses. If not, the router
 127 declines. Otherwise route to the single IP address, setting the host name to
 128 "(unnamed)". */
 129
 130 if (domain[0] != '[' || domain[len-1] != ']') return DECLINE;
 131 ip = string_copyn(domain+1, len-2);
 132 if (strncmpic(ip, US"IPV6:", 5) == 0 || strncmpic(ip, US"IPV4:", 5) == 0)
 133   ip += 5;
 134
 135 ipv = string_is_ip_address(ip, NULL);
 136 if (ipv == 0 || (disable_ipv6 && ipv == 6))
 137   return DECLINE;
 138
 139 /* It seems unlikely that ignore_target_hosts will be used with this router,
 140 but if it is set, it should probably work. */
 141
 142 if (verify_check_this_host(CUSS&rblock->ignore_target_hosts,
 143         NULL, domain, ip, NULL) == OK)
 144   {
 145   DEBUG(D_route)
 146       debug_printf("%s is in ignore_target_hosts\n", ip);
 147   addr->message = US"IP literal host explicitly ignored";
 148   return DECLINE;
 149   }
 150
 151 /* Set up a host item */
 152
 153 h = store_get(sizeof(host_item), FALSE);
 154
 155 h->next = NULL;
 156 h->address = string_copy(ip);
 157 h->port = PORT_NONE;
 158 h->name = domain;
 159 h->mx = MX_NONE;
 160 h->status = hstatus_unknown;
 161 h->why = hwhy_unknown;
 162 h->last_try = 0;
 163
 164 /* Determine whether the host is the local host, and if so, take action
 165 according to the configuration. */
 166
 167 if (host_scan_for_local_hosts(h, &h, NULL) == HOST_FOUND_LOCAL)
 168   {
 169   int rc = rf_self_action(addr, h, rblock->self_code, rblock->self_rewrite,
 170     rblock->self, addr_new);
 171   if (rc != OK) return rc;
 172   }
 173
 174 /* Address is routed to this host */
 175
 176 addr->host_list = h;
 177
 178 /* Set up the errors address, if any. */
 179
 180 rc = rf_get_errors_address(addr, rblock, verify, &addr->prop.errors_address);
 181 if (rc != OK) return rc;
 182
 183 /* Set up the additional and removable headers for this address. */
 184
 185 rc = rf_get_munge_headers(addr, rblock, &addr->prop.extra_headers,
 186   &addr->prop.remove_headers);
 187 if (rc != OK) return rc;
 188
 189 /* Fill in the transport, queue the address for local or remote delivery, and
 190 yield success. For local delivery, of course, the IP address won't be used. If
 191 just verifying, there need not be a transport, in which case it doesn't matter
 192 which queue we put the address on. This is all now handled by the route_queue()
 193 function. */
 194
 195 if (!rf_get_transport(rblock->transport_name, &(rblock->transport),
 196       addr, rblock->name, NULL))
 197   return DEFER;
 198
 199 addr->transport = rblock->transport;
 200
 201 return rf_queue_add(addr, addr_local, addr_remote, rblock, pw)?
 202   OK : DEFER;
 203 }
 204
 205 #endif   /*!MACRO_PREDEF*/
 206 /* End of routers/ipliteral.c */