2 * This file is part of DisOrder.
3 * Copyright (C) 2004 Richard Kettlewell
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.
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.
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
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <netinet/in.h>
33 #include "configuration.h"
36 /** @brief Convert a pair of strings to an address
37 * @param a Pointer to string list
38 * @param pref Hints structure for getaddrinfo, or NULL
39 * @param namep Where to store address description, or NULL
40 * @return Address info structure or NULL on error
42 * This converts one or two strings into an address specification suitable
43 * for passing to socket(), bind() etc.
45 * If there is only one string then it is assumed to be the service
46 * name (port number). If there are two then the first is the host
47 * name and the second the service name.
49 * @p namep is used to return a description of the address suitable
50 * for use in log messages.
52 * If an error occurs a message is logged and a null pointer returned.
54 struct addrinfo
*get_address(const struct stringlist
*a
,
55 const struct addrinfo
*pref
,
63 byte_xasprintf(&name
, "host * service %s", a
->s
[0]);
64 if((rc
= getaddrinfo(0, a
->s
[0], pref
, &res
))) {
65 error(0, "getaddrinfo %s: %s", a
->s
[0], gai_strerror(rc
));
70 byte_xasprintf(&name
, "host %s service %s", a
->s
[0], a
->s
[1]);
71 if((rc
= getaddrinfo(a
->s
[0], a
->s
[1], pref
, &res
))) {
72 error(0, "getaddrinfo %s %s: %s", a
->s
[0], a
->s
[1], gai_strerror(rc
));
77 error(0, "invalid network address specification (n=%d)", a
->n
);
80 if(!res
|| (pref
&& res
->ai_socktype
!= pref
->ai_socktype
)) {
81 error(0, "getaddrinfo didn't give us a suitable socket address");
91 /** @brief Comparison function for address information
93 * Suitable for qsort().
95 int addrinfocmp(const struct addrinfo
*a
,
96 const struct addrinfo
*b
) {
97 const struct sockaddr_in
*ina
, *inb
;
98 const struct sockaddr_in6
*in6a
, *in6b
;
100 if(a
->ai_family
!= b
->ai_family
) return a
->ai_family
- b
->ai_family
;
101 if(a
->ai_socktype
!= b
->ai_socktype
) return a
->ai_socktype
- b
->ai_socktype
;
102 if(a
->ai_protocol
!= b
->ai_protocol
) return a
->ai_protocol
- b
->ai_protocol
;
103 switch(a
->ai_protocol
) {
105 ina
= (const struct sockaddr_in
*)a
->ai_addr
;
106 inb
= (const struct sockaddr_in
*)b
->ai_addr
;
107 if(ina
->sin_port
!= inb
->sin_port
) return ina
->sin_port
- inb
->sin_port
;
108 return ina
->sin_addr
.s_addr
- inb
->sin_addr
.s_addr
;
111 in6a
= (const struct sockaddr_in6
*)a
->ai_addr
;
112 in6b
= (const struct sockaddr_in6
*)b
->ai_addr
;
113 if(in6a
->sin6_port
!= in6b
->sin6_port
)
114 return in6a
->sin6_port
- in6b
->sin6_port
;
115 return memcmp(&in6a
->sin6_addr
, &in6b
->sin6_addr
,
116 sizeof (struct in6_addr
));
118 error(0, "unsupported protocol family %d", a
->ai_protocol
);
119 return memcmp(a
->ai_addr
, b
->ai_addr
, a
->ai_addrlen
); /* kludge */