1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/*
getaddrinfo -- nodename-to-address translation in protocol-independent manner
Copyright (C) 2000 Dieter Baron
This file is a replacement for the following library functions:
getaddrinfo, freeaddrinfo, gai_strerror.
The author can be contacted at <dillo@giga.or.at>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdlib.h>
#include "config.h"
#include "sockets.h"
#ifndef H_ERRNO_DECLARED
extern int h_errno;
#endif
int
getaddrinfo(const char *nodename, const char *servname,
const struct addrinfo *hints, struct addrinfo **res)
{
struct addrinfo *ai, *airet, *aiprev;
struct hostent *hp;
struct sockaddr_in sa;
struct servent *serv;
u_short port;
char addr[4], *s_addr_list[2], **addr_list;
int addr_len;
int i;
/* XXX: check arguments */
/* XXX: get proto */
if (hints && hints->ai_family != PF_UNSPEC
&& hints->ai_family != PF_INET)
return EAI_FAMILY;
if ((serv = getservbyname(servname, "tcp")) == NULL) {
if ((port=atoi(servname))==0
&& (servname[0]!='0' || servname[1]!='\0')) {
return EAI_SERVICE;
}
port = htons(port);
}
else
port = (u_short)serv->s_port;
sa.sin_family = AF_INET;
sa.sin_port = port;
memset(sa.sin_zero, 0, 8);
addr_list = s_addr_list;
addr_list[0] = addr;
addr_list[1] = NULL;
addr_len = 4;
if (hints->ai_flags & AI_PASSIVE && nodename == NULL) {
sa.sin_addr.s_addr = INADDR_ANY;
memcpy(addr_list[0], &sa.sin_addr.s_addr, addr_len);
}
else if (inet_aton(nodename, &sa.sin_addr) == 1) {
memcpy(addr_list[0], &sa.sin_addr.s_addr, addr_len);
}
else {
if ((hp = gethostbyname(nodename)) == NULL) {
switch (h_errno) {
case TRY_AGAIN:
return EAI_AGAIN;
case HOST_NOT_FOUND:
case NO_DATA:
return EAI_NODATA;
case NO_RECOVERY:
default:
return EAI_FAIL;
}
}
addr_list = hp->h_addr_list;
addr_len = hp->h_length;
}
airet = aiprev = NULL;
for (i=0; addr_list[i]; i++) {
if ((ai=malloc(sizeof(struct addrinfo))) == NULL) {
freeaddrinfo(airet);
return EAI_MEMORY;
}
if (airet == NULL)
airet = ai;
if (aiprev)
aiprev->ai_next = ai;
aiprev = ai;
ai->ai_next = NULL;
ai->ai_family = AF_INET;
ai->ai_socktype = SOCK_STREAM; /* XXX: from hints */
ai->ai_protocol = IPPROTO_TCP; /* XXX: from hints */
memcpy(&sa.sin_addr, addr_list[i], addr_len);
if ((ai->ai_addr=malloc(sizeof(struct sockaddr_in))) == NULL) {
freeaddrinfo(airet);
return EAI_MEMORY;
}
memcpy(ai->ai_addr, &sa, sizeof(struct sockaddr_in));
ai->ai_addrlen = sizeof(struct sockaddr_in);
}
*res = airet;
return 0;
}
void
freeaddrinfo(struct addrinfo *ai)
{
struct addrinfo *ai2;
while (ai) {
ai2 = ai->ai_next;
free(ai->ai_addr);
free(ai);
ai = ai2;
}
}
char *
gai_strerror(int ecode)
{
static char *estr[] = {
"Success",
"Address family for hostname not supported",
"Temporary failure in name resolution",
"Invalid value for ai_flags",
"Non-recoverable failure in name resolution",
"ai_family not supported",
"Memory allocation failure",
"No address associated with hostname",
"hostname nor servname provided, or not known",
"servname not supported for ai_socktype",
"ai_socktype not supported",
"System error returned in errno"
};
static const int nestr = sizeof(estr)/sizeof(estr[0]);
return (int)ecode < nestr ? estr[ecode] : "Unknown error";
}
|
