diff options
Diffstat (limited to 'fake-getaddrinfo.c')
-rw-r--r-- | fake-getaddrinfo.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/fake-getaddrinfo.c b/fake-getaddrinfo.c new file mode 100644 index 000000000..b918798c4 --- /dev/null +++ b/fake-getaddrinfo.c | |||
@@ -0,0 +1,119 @@ | |||
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 | * In the case not using 'configure --enable-ipv6', this getaddrinfo.c | ||
12 | * will be used if you have broken getaddrinfo or no getaddrinfo. | ||
13 | */ | ||
14 | |||
15 | #include "includes.h" | ||
16 | #include "ssh.h" | ||
17 | |||
18 | #ifndef HAVE_GAI_STRERROR | ||
19 | char * | ||
20 | gai_strerror(ecode) | ||
21 | int ecode; | ||
22 | { | ||
23 | switch (ecode) { | ||
24 | case EAI_NODATA: | ||
25 | return "no address associated with hostname."; | ||
26 | case EAI_MEMORY: | ||
27 | return "memory allocation failure."; | ||
28 | default: | ||
29 | return "unknown error."; | ||
30 | } | ||
31 | } | ||
32 | #endif /* !HAVE_GAI_STRERROR */ | ||
33 | |||
34 | #ifndef HAVE_FREEADDRINFO | ||
35 | void | ||
36 | freeaddrinfo(ai) | ||
37 | struct addrinfo *ai; | ||
38 | { | ||
39 | struct addrinfo *next; | ||
40 | |||
41 | do { | ||
42 | next = ai->ai_next; | ||
43 | free(ai); | ||
44 | } while (ai = next); | ||
45 | } | ||
46 | #endif /* !HAVE_FREEADDRINFO */ | ||
47 | |||
48 | #ifndef HAVE_GETADDRINFO | ||
49 | static struct addrinfo * | ||
50 | malloc_ai(port, addr) | ||
51 | int port; | ||
52 | u_long addr; | ||
53 | { | ||
54 | struct addrinfo *ai; | ||
55 | |||
56 | if (ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) + | ||
57 | sizeof(struct sockaddr_in))) { | ||
58 | memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in)); | ||
59 | ai->ai_addr = (struct sockaddr *)(ai + 1); | ||
60 | /* XXX -- ssh doesn't use sa_len */ | ||
61 | ai->ai_addrlen = sizeof(struct sockaddr_in); | ||
62 | ai->ai_addr->sa_family = ai->ai_family = AF_INET; | ||
63 | ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port; | ||
64 | ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr; | ||
65 | return ai; | ||
66 | } else { | ||
67 | return NULL; | ||
68 | } | ||
69 | } | ||
70 | |||
71 | int | ||
72 | getaddrinfo(hostname, servname, hints, res) | ||
73 | const char *hostname, *servname; | ||
74 | const struct addrinfo *hints; | ||
75 | struct addrinfo **res; | ||
76 | { | ||
77 | struct addrinfo *cur, *prev = NULL; | ||
78 | struct hostent *hp; | ||
79 | int i, port; | ||
80 | |||
81 | if (servname) | ||
82 | port = htons(atoi(servname)); | ||
83 | else | ||
84 | port = 0; | ||
85 | if (hints && hints->ai_flags & AI_PASSIVE) | ||
86 | if (*res = malloc_ai(port, htonl(0x00000000))) | ||
87 | return 0; | ||
88 | else | ||
89 | return EAI_MEMORY; | ||
90 | if (!hostname) | ||
91 | if (*res = malloc_ai(port, htonl(0x7f000001))) | ||
92 | return 0; | ||
93 | else | ||
94 | return EAI_MEMORY; | ||
95 | if (inet_addr(hostname) != -1) | ||
96 | if (*res = malloc_ai(port, inet_addr(hostname))) | ||
97 | return 0; | ||
98 | else | ||
99 | return EAI_MEMORY; | ||
100 | if ((hp = gethostbyname(hostname)) && | ||
101 | hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) { | ||
102 | for (i = 0; hp->h_addr_list[i]; i++) | ||
103 | if (cur = malloc_ai(port, | ||
104 | ((struct in_addr *)hp->h_addr_list[i])->s_addr)) { | ||
105 | if (prev) | ||
106 | prev->ai_next = cur; | ||
107 | else | ||
108 | *res = cur; | ||
109 | prev = cur; | ||
110 | } else { | ||
111 | if (*res) | ||
112 | freeaddrinfo(*res); | ||
113 | return EAI_MEMORY; | ||
114 | } | ||
115 | return 0; | ||
116 | } | ||
117 | return EAI_NODATA; | ||
118 | } | ||
119 | #endif /* !HAVE_GETADDRINFO */ | ||