1 /*
2 * fake library for ssh
3 *
4 * This file includes getaddrinfo(), freeaddrinfo() and gai_strerror().
5 * These funtions are defined in rfc2133.
6 *
7 * But these functions are not implemented correctly. The minimum subset
8 * is implemented for ssh use only. For exapmle, this routine assumes
9 * that ai_family is AF_INET. Don't use it for another purpose.
10 */
11
12 #include "includes.h"
13 #include "ssh.h"
14
15 RCSID("$Id: fake-getaddrinfo.c,v 1.2 2001/02/09 01:55:36 djm Exp $");
16
17 #pragma ident "%Z%%M% %I% %E% SMI"
18
19 #ifndef HAVE_GAI_STRERROR
gai_strerror(int ecode)20 char *gai_strerror(int ecode)
21 {
22 switch (ecode) {
23 case EAI_NODATA:
24 return "no address associated with hostname.";
25 case EAI_MEMORY:
26 return "memory allocation failure.";
27 default:
28 return "unknown error.";
29 }
30 }
31 #endif /* !HAVE_GAI_STRERROR */
32
33 #ifndef HAVE_FREEADDRINFO
freeaddrinfo(struct addrinfo * ai)34 void freeaddrinfo(struct addrinfo *ai)
35 {
36 struct addrinfo *next;
37
38 do {
39 next = ai->ai_next;
40 free(ai);
41 } while (NULL != (ai = next));
42 }
43 #endif /* !HAVE_FREEADDRINFO */
44
45 #ifndef HAVE_GETADDRINFO
malloc_ai(int port,u_long addr)46 static struct addrinfo *malloc_ai(int port, u_long addr)
47 {
48 struct addrinfo *ai;
49
50 ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
51 if (ai == NULL)
52 return(NULL);
53
54 memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
55
56 ai->ai_addr = (struct sockaddr *)(ai + 1);
57 /* XXX -- ssh doesn't use sa_len */
58 ai->ai_addrlen = sizeof(struct sockaddr_in);
59 ai->ai_addr->sa_family = ai->ai_family = AF_INET;
60
61 ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
62 ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
63
64 return(ai);
65 }
66
getaddrinfo(const char * hostname,const char * servname,const struct addrinfo * hints,struct addrinfo ** res)67 int getaddrinfo(const char *hostname, const char *servname,
68 const struct addrinfo *hints, struct addrinfo **res)
69 {
70 struct addrinfo *cur, *prev = NULL;
71 struct hostent *hp;
72 struct in_addr in;
73 int i, port;
74
75 if (servname)
76 port = htons(atoi(servname));
77 else
78 port = 0;
79
80 if (hints && hints->ai_flags & AI_PASSIVE) {
81 if (NULL != (*res = malloc_ai(port, htonl(0x00000000))))
82 return 0;
83 else
84 return EAI_MEMORY;
85 }
86
87 if (!hostname) {
88 if (NULL != (*res = malloc_ai(port, htonl(0x7f000001))))
89 return 0;
90 else
91 return EAI_MEMORY;
92 }
93
94 if (inet_aton(hostname, &in)) {
95 if (NULL != (*res = malloc_ai(port, in.s_addr)))
96 return 0;
97 else
98 return EAI_MEMORY;
99 }
100
101 hp = gethostbyname(hostname);
102 if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
103 for (i = 0; hp->h_addr_list[i]; i++) {
104 cur = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
105 if (cur == NULL) {
106 if (*res)
107 freeaddrinfo(*res);
108 return EAI_MEMORY;
109 }
110
111 if (prev)
112 prev->ai_next = cur;
113 else
114 *res = cur;
115
116 prev = cur;
117 }
118 return 0;
119 }
120
121 return EAI_NODATA;
122 }
123 #endif /* !HAVE_GETADDRINFO */
124