1abdb043a32bb41b9e25c7dc0662e483c90d3821
[exim.git] / 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 */