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Commit | Line | Data |
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3c0ef626 | 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("$Id$"); | |
16 | ||
17 | #ifndef HAVE_GAI_STRERROR | |
18 | char *gai_strerror(int ecode) | |
19 | { | |
20 | switch (ecode) { | |
21 | case EAI_NODATA: | |
22 | return "no address associated with hostname."; | |
23 | case EAI_MEMORY: | |
24 | return "memory allocation failure."; | |
25 | default: | |
26 | return "unknown error."; | |
27 | } | |
28 | } | |
29 | #endif /* !HAVE_GAI_STRERROR */ | |
30 | ||
31 | #ifndef HAVE_FREEADDRINFO | |
32 | void freeaddrinfo(struct addrinfo *ai) | |
33 | { | |
34 | struct addrinfo *next; | |
35 | ||
36 | do { | |
37 | next = ai->ai_next; | |
38 | free(ai); | |
39 | } while (NULL != (ai = next)); | |
40 | } | |
41 | #endif /* !HAVE_FREEADDRINFO */ | |
42 | ||
43 | #ifndef HAVE_GETADDRINFO | |
44 | static struct addrinfo *malloc_ai(int port, u_long addr) | |
45 | { | |
46 | struct addrinfo *ai; | |
47 | ||
48 | ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in)); | |
49 | if (ai == NULL) | |
50 | return(NULL); | |
51 | ||
52 | memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in)); | |
53 | ||
54 | ai->ai_addr = (struct sockaddr *)(ai + 1); | |
55 | /* XXX -- ssh doesn't use sa_len */ | |
56 | ai->ai_addrlen = sizeof(struct sockaddr_in); | |
57 | ai->ai_addr->sa_family = ai->ai_family = AF_INET; | |
58 | ||
59 | ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port; | |
60 | ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr; | |
61 | ||
62 | return(ai); | |
63 | } | |
64 | ||
65 | int getaddrinfo(const char *hostname, const char *servname, | |
66 | const struct addrinfo *hints, struct addrinfo **res) | |
67 | { | |
68 | struct addrinfo *cur, *prev = NULL; | |
69 | struct hostent *hp; | |
70 | struct in_addr in; | |
71 | int i, port; | |
72 | ||
73 | if (servname) | |
74 | port = htons(atoi(servname)); | |
75 | else | |
76 | port = 0; | |
77 | ||
78 | if (hints && hints->ai_flags & AI_PASSIVE) { | |
79 | if (NULL != (*res = malloc_ai(port, htonl(0x00000000)))) | |
80 | return 0; | |
81 | else | |
82 | return EAI_MEMORY; | |
83 | } | |
84 | ||
85 | if (!hostname) { | |
86 | if (NULL != (*res = malloc_ai(port, htonl(0x7f000001)))) | |
87 | return 0; | |
88 | else | |
89 | return EAI_MEMORY; | |
90 | } | |
91 | ||
92 | if (inet_aton(hostname, &in)) { | |
93 | if (NULL != (*res = malloc_ai(port, in.s_addr))) | |
94 | return 0; | |
95 | else | |
96 | return EAI_MEMORY; | |
97 | } | |
98 | ||
99 | hp = gethostbyname(hostname); | |
100 | if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) { | |
101 | for (i = 0; hp->h_addr_list[i]; i++) { | |
102 | cur = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr); | |
103 | if (cur == NULL) { | |
104 | if (*res) | |
105 | freeaddrinfo(*res); | |
106 | return EAI_MEMORY; | |
107 | } | |
108 | ||
109 | if (prev) | |
110 | prev->ai_next = cur; | |
111 | else | |
112 | *res = cur; | |
113 | ||
114 | prev = cur; | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
119 | return EAI_NODATA; | |
120 | } | |
121 | #endif /* !HAVE_GETADDRINFO */ |