c5e438ec |
1 | /* |
2 | * SSH agent client code. |
3 | */ |
4 | |
5 | #include <stdio.h> |
6 | #include <stdlib.h> |
fbbb86aa |
7 | #include <assert.h> |
8 | #include <unistd.h> |
9 | #include <sys/socket.h> |
10 | #include <sys/un.h> |
c5e438ec |
11 | |
12 | #include "misc.h" |
13 | #include "puttymem.h" |
14 | |
15 | #define GET_32BIT(cp) \ |
16 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
17 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
18 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
19 | ((unsigned long)(unsigned char)(cp)[3])) |
20 | |
21 | int agent_exists(void) |
22 | { |
fbbb86aa |
23 | if (getenv("SSH_AUTH_SOCK") != NULL) |
24 | return TRUE; |
25 | return FALSE; |
c5e438ec |
26 | } |
27 | |
28 | void agent_query(void *in, int inlen, void **out, int *outlen) |
29 | { |
fbbb86aa |
30 | char *name; |
31 | int sock; |
32 | struct sockaddr_un addr; |
33 | int done; |
34 | int retsize, retlen; |
35 | char sizebuf[4], *retbuf; |
36 | |
37 | name = getenv("SSH_AUTH_SOCK"); |
38 | if (!name) |
39 | goto failure; |
40 | |
41 | sock = socket(PF_UNIX, SOCK_STREAM, 0); |
42 | if (sock < 0) { |
43 | perror("socket(PF_UNIX)"); |
44 | exit(1); |
45 | } |
46 | |
47 | addr.sun_family = AF_UNIX; |
48 | strncpy(addr.sun_path, name, sizeof(addr.sun_path)); |
49 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) { |
50 | close(sock); |
51 | goto failure; |
52 | } |
53 | |
54 | for (done = 0; done < inlen ;) { |
55 | int ret = write(sock, (char *)in + done, inlen - done); |
56 | if (ret <= 0) { |
57 | close(sock); |
58 | goto failure; |
59 | } |
60 | done += ret; |
61 | } |
62 | |
63 | retbuf = sizebuf; |
64 | retsize = 4; |
65 | retlen = 0; |
66 | |
67 | while (retlen < retsize) { |
68 | int ret = read(sock, retbuf + retlen, retsize - retlen); |
69 | if (ret <= 0) { |
70 | close(sock); |
71 | if (retbuf != sizebuf) sfree(retbuf); |
72 | goto failure; |
73 | } |
74 | retlen += ret; |
75 | if (retsize == 4 && retlen == 4) { |
76 | retsize = GET_32BIT(retbuf); |
77 | if (retsize <= 0) { |
78 | close(sock); |
79 | goto failure; |
80 | } |
81 | retsize += 4; |
82 | assert(retbuf == sizebuf); |
3d88e64d |
83 | retbuf = snewn(retsize, char); |
fbbb86aa |
84 | memcpy(retbuf, sizebuf, 4); |
85 | } |
86 | } |
87 | |
88 | assert(retbuf != sizebuf); |
89 | *out = retbuf; |
90 | *outlen = retlen; |
91 | return; |
92 | |
93 | failure: |
94 | *out = NULL; |
95 | *outlen = 0; |
c5e438ec |
96 | } |