Commit | Line | Data |
---|---|---|
460b9539 | 1 | /* |
2 | * This file is part of DisOrder. | |
3 | * Copyright (C) 2004 Richard Kettlewell | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
14ad73b9 | 20 | /** @file lib/addr.c Socket address support */ |
460b9539 | 21 | |
22 | #include <config.h> | |
23 | #include "types.h" | |
24 | ||
25 | #include <stdio.h> | |
26 | #include <string.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/socket.h> | |
29 | #include <netinet/in.h> | |
30 | #include <netdb.h> | |
31 | ||
32 | #include "log.h" | |
33 | #include "printf.h" | |
34 | #include "configuration.h" | |
35 | #include "addr.h" | |
36 | ||
ec6f8488 | 37 | /** @brief Convert a pair of strings to an address |
38 | * @param a Pointer to string list | |
39 | * @param pref Hints structure for getaddrinfo, or NULL | |
40 | * @param namep Where to store address description, or NULL | |
41 | * @return Address info structure or NULL on error | |
42 | * | |
43 | * This converts one or two strings into an address specification suitable | |
44 | * for passing to socket(), bind() etc. | |
45 | * | |
46 | * If there is only one string then it is assumed to be the service | |
47 | * name (port number). If there are two then the first is the host | |
48 | * name and the second the service name. | |
49 | * | |
50 | * @p namep is used to return a description of the address suitable | |
51 | * for use in log messages. | |
52 | * | |
53 | * If an error occurs a message is logged and a null pointer returned. | |
54 | */ | |
460b9539 | 55 | struct addrinfo *get_address(const struct stringlist *a, |
56 | const struct addrinfo *pref, | |
57 | char **namep) { | |
58 | struct addrinfo *res; | |
59 | char *name; | |
60 | int rc; | |
e83d0967 RK |
61 | |
62 | switch(a->n) { | |
63 | case 1: | |
460b9539 | 64 | byte_xasprintf(&name, "host * service %s", a->s[0]); |
65 | if((rc = getaddrinfo(0, a->s[0], pref, &res))) { | |
66 | error(0, "getaddrinfo %s: %s", a->s[0], gai_strerror(rc)); | |
67 | return 0; | |
68 | } | |
e83d0967 RK |
69 | break; |
70 | case 2: | |
460b9539 | 71 | byte_xasprintf(&name, "host %s service %s", a->s[0], a->s[1]); |
72 | if((rc = getaddrinfo(a->s[0], a->s[1], pref, &res))) { | |
73 | error(0, "getaddrinfo %s %s: %s", a->s[0], a->s[1], gai_strerror(rc)); | |
74 | return 0; | |
75 | } | |
e83d0967 RK |
76 | break; |
77 | default: | |
78 | error(0, "invalid network address specification (n=%d)", a->n); | |
79 | return 0; | |
460b9539 | 80 | } |
e83d0967 RK |
81 | if(!res || (pref && res->ai_socktype != pref->ai_socktype)) { |
82 | error(0, "getaddrinfo didn't give us a suitable socket address"); | |
460b9539 | 83 | if(res) |
84 | freeaddrinfo(res); | |
85 | return 0; | |
86 | } | |
87 | if(namep) | |
88 | *namep = name; | |
89 | return res; | |
90 | } | |
91 | ||
d7b6f0d1 | 92 | /** @brief Comparison function for address information |
93 | * | |
94 | * Suitable for qsort(). | |
95 | */ | |
460b9539 | 96 | int addrinfocmp(const struct addrinfo *a, |
97 | const struct addrinfo *b) { | |
98 | const struct sockaddr_in *ina, *inb; | |
99 | const struct sockaddr_in6 *in6a, *in6b; | |
100 | ||
101 | if(a->ai_family != b->ai_family) return a->ai_family - b->ai_family; | |
102 | if(a->ai_socktype != b->ai_socktype) return a->ai_socktype - b->ai_socktype; | |
103 | if(a->ai_protocol != b->ai_protocol) return a->ai_protocol - b->ai_protocol; | |
104 | switch(a->ai_protocol) { | |
105 | case PF_INET: | |
106 | ina = (const struct sockaddr_in *)a->ai_addr; | |
107 | inb = (const struct sockaddr_in *)b->ai_addr; | |
108 | if(ina->sin_port != inb->sin_port) return ina->sin_port - inb->sin_port; | |
109 | return ina->sin_addr.s_addr - inb->sin_addr.s_addr; | |
110 | break; | |
111 | case PF_INET6: | |
112 | in6a = (const struct sockaddr_in6 *)a->ai_addr; | |
113 | in6b = (const struct sockaddr_in6 *)b->ai_addr; | |
114 | if(in6a->sin6_port != in6b->sin6_port) | |
115 | return in6a->sin6_port - in6b->sin6_port; | |
116 | return memcmp(&in6a->sin6_addr, &in6b->sin6_addr, | |
117 | sizeof (struct in6_addr)); | |
118 | default: | |
119 | error(0, "unsupported protocol family %d", a->ai_protocol); | |
120 | return memcmp(a->ai_addr, b->ai_addr, a->ai_addrlen); /* kludge */ | |
121 | } | |
122 | } | |
123 | ||
124 | /* | |
125 | Local Variables: | |
126 | c-basic-offset:2 | |
127 | comment-column:40 | |
128 | End: | |
129 | */ |