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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> | |
6fba990c RK |
31 | #include <arpa/inet.h> |
32 | #include <sys/un.h> | |
460b9539 | 33 | |
34 | #include "log.h" | |
35 | #include "printf.h" | |
36 | #include "configuration.h" | |
37 | #include "addr.h" | |
6fba990c | 38 | #include "mem.h" |
460b9539 | 39 | |
ec6f8488 | 40 | /** @brief Convert a pair of strings to an address |
41 | * @param a Pointer to string list | |
42 | * @param pref Hints structure for getaddrinfo, or NULL | |
43 | * @param namep Where to store address description, or NULL | |
44 | * @return Address info structure or NULL on error | |
45 | * | |
46 | * This converts one or two strings into an address specification suitable | |
47 | * for passing to socket(), bind() etc. | |
48 | * | |
49 | * If there is only one string then it is assumed to be the service | |
50 | * name (port number). If there are two then the first is the host | |
51 | * name and the second the service name. | |
52 | * | |
53 | * @p namep is used to return a description of the address suitable | |
54 | * for use in log messages. | |
55 | * | |
56 | * If an error occurs a message is logged and a null pointer returned. | |
57 | */ | |
460b9539 | 58 | struct addrinfo *get_address(const struct stringlist *a, |
59 | const struct addrinfo *pref, | |
60 | char **namep) { | |
61 | struct addrinfo *res; | |
62 | char *name; | |
63 | int rc; | |
e83d0967 RK |
64 | |
65 | switch(a->n) { | |
66 | case 1: | |
460b9539 | 67 | byte_xasprintf(&name, "host * service %s", a->s[0]); |
68 | if((rc = getaddrinfo(0, a->s[0], pref, &res))) { | |
69 | error(0, "getaddrinfo %s: %s", a->s[0], gai_strerror(rc)); | |
70 | return 0; | |
71 | } | |
e83d0967 RK |
72 | break; |
73 | case 2: | |
460b9539 | 74 | byte_xasprintf(&name, "host %s service %s", a->s[0], a->s[1]); |
75 | if((rc = getaddrinfo(a->s[0], a->s[1], pref, &res))) { | |
76 | error(0, "getaddrinfo %s %s: %s", a->s[0], a->s[1], gai_strerror(rc)); | |
77 | return 0; | |
78 | } | |
e83d0967 RK |
79 | break; |
80 | default: | |
81 | error(0, "invalid network address specification (n=%d)", a->n); | |
82 | return 0; | |
460b9539 | 83 | } |
e83d0967 RK |
84 | if(!res || (pref && res->ai_socktype != pref->ai_socktype)) { |
85 | error(0, "getaddrinfo didn't give us a suitable socket address"); | |
460b9539 | 86 | if(res) |
87 | freeaddrinfo(res); | |
88 | return 0; | |
89 | } | |
90 | if(namep) | |
91 | *namep = name; | |
92 | return res; | |
93 | } | |
94 | ||
d7b6f0d1 | 95 | /** @brief Comparison function for address information |
96 | * | |
97 | * Suitable for qsort(). | |
98 | */ | |
460b9539 | 99 | int addrinfocmp(const struct addrinfo *a, |
100 | const struct addrinfo *b) { | |
101 | const struct sockaddr_in *ina, *inb; | |
102 | const struct sockaddr_in6 *in6a, *in6b; | |
103 | ||
104 | if(a->ai_family != b->ai_family) return a->ai_family - b->ai_family; | |
105 | if(a->ai_socktype != b->ai_socktype) return a->ai_socktype - b->ai_socktype; | |
106 | if(a->ai_protocol != b->ai_protocol) return a->ai_protocol - b->ai_protocol; | |
107 | switch(a->ai_protocol) { | |
108 | case PF_INET: | |
109 | ina = (const struct sockaddr_in *)a->ai_addr; | |
110 | inb = (const struct sockaddr_in *)b->ai_addr; | |
111 | if(ina->sin_port != inb->sin_port) return ina->sin_port - inb->sin_port; | |
112 | return ina->sin_addr.s_addr - inb->sin_addr.s_addr; | |
113 | break; | |
114 | case PF_INET6: | |
115 | in6a = (const struct sockaddr_in6 *)a->ai_addr; | |
116 | in6b = (const struct sockaddr_in6 *)b->ai_addr; | |
117 | if(in6a->sin6_port != in6b->sin6_port) | |
118 | return in6a->sin6_port - in6b->sin6_port; | |
119 | return memcmp(&in6a->sin6_addr, &in6b->sin6_addr, | |
120 | sizeof (struct in6_addr)); | |
121 | default: | |
122 | error(0, "unsupported protocol family %d", a->ai_protocol); | |
123 | return memcmp(a->ai_addr, b->ai_addr, a->ai_addrlen); /* kludge */ | |
124 | } | |
125 | } | |
6fba990c RK |
126 | |
127 | static inline int multicast4(const struct sockaddr_in *sin) { | |
128 | return IN_MULTICAST(ntohl(sin->sin_addr.s_addr)); | |
129 | } | |
130 | ||
131 | static inline int multicast6(const struct sockaddr_in6 *sin6) { | |
132 | return IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr); | |
133 | } | |
134 | ||
135 | /** @brief Return true if @p sa represents a multicast address */ | |
136 | int multicast(const struct sockaddr *sa) { | |
137 | switch(sa->sa_family) { | |
138 | case AF_INET: | |
139 | return multicast4((const struct sockaddr_in *)sa); | |
140 | case AF_INET6: | |
141 | return multicast6((const struct sockaddr_in6 *)sa); | |
142 | default: | |
143 | return 0; | |
144 | } | |
145 | } | |
146 | ||
147 | static inline char *format_sockaddr4(const struct sockaddr_in *sin) { | |
148 | char buffer[1024], *r; | |
149 | ||
150 | if(sin->sin_port) | |
151 | byte_xasprintf(&r, "%s port %u", | |
152 | inet_ntop(sin->sin_family, &sin->sin_addr, | |
153 | buffer, sizeof buffer), | |
154 | ntohs(sin->sin_port)); | |
155 | else | |
156 | byte_xasprintf(&r, "%s", | |
157 | inet_ntop(sin->sin_family, &sin->sin_addr, | |
158 | buffer, sizeof buffer)); | |
159 | return r; | |
160 | } | |
161 | ||
162 | static inline char *format_sockaddr6(const struct sockaddr_in6 *sin6) { | |
163 | char buffer[1024], *r; | |
164 | ||
165 | if(sin6->sin6_port) | |
166 | byte_xasprintf(&r, "%s port %u", | |
167 | inet_ntop(sin6->sin6_family, &sin6->sin6_addr, | |
168 | buffer, sizeof buffer), | |
169 | ntohs(sin6->sin6_port)); | |
170 | else | |
171 | byte_xasprintf(&r, "%s", | |
172 | inet_ntop(sin6->sin6_family, &sin6->sin6_addr, | |
173 | buffer, sizeof buffer)); | |
174 | return r; | |
175 | } | |
176 | ||
177 | static inline char *format_sockaddrun(const struct sockaddr_un *sun) { | |
178 | return xstrdup(sun->sun_path); | |
179 | } | |
180 | ||
181 | /** @brief Construct a text description a sockaddr */ | |
182 | char *format_sockaddr(const struct sockaddr *sa) { | |
183 | switch(sa->sa_family) { | |
184 | case AF_INET: | |
185 | return format_sockaddr4((const struct sockaddr_in *)sa); | |
186 | case AF_INET6: | |
187 | return format_sockaddr6((const struct sockaddr_in6 *)sa); | |
188 | case AF_UNIX: | |
189 | return format_sockaddrun((const struct sockaddr_un *)sa); | |
190 | default: | |
191 | return 0; | |
192 | } | |
193 | } | |
194 | ||
460b9539 | 195 | /* |
196 | Local Variables: | |
197 | c-basic-offset:2 | |
198 | comment-column:40 | |
199 | End: | |
200 | */ |