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Commit | Line | Data |
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1c1af145 | 1 | /* |
2 | * SSH agent client code. | |
3 | */ | |
4 | ||
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | #include <assert.h> | |
8 | #include <unistd.h> | |
9 | #include <sys/socket.h> | |
10 | #include <sys/un.h> | |
11 | #include <fcntl.h> | |
12 | ||
13 | #include "putty.h" | |
14 | #include "misc.h" | |
15 | #include "tree234.h" | |
16 | #include "puttymem.h" | |
17 | ||
18 | int agent_exists(void) | |
19 | { | |
20 | if (getenv("SSH_AUTH_SOCK") != NULL) | |
21 | return TRUE; | |
22 | return FALSE; | |
23 | } | |
24 | ||
25 | static tree234 *agent_connections; | |
26 | struct agent_connection { | |
27 | int fd; | |
28 | char *retbuf; | |
29 | char sizebuf[4]; | |
30 | int retsize, retlen; | |
31 | void (*callback)(void *, void *, int); | |
32 | void *callback_ctx; | |
33 | }; | |
34 | static int agent_conncmp(void *av, void *bv) | |
35 | { | |
36 | struct agent_connection *a = (struct agent_connection *) av; | |
37 | struct agent_connection *b = (struct agent_connection *) bv; | |
38 | if (a->fd < b->fd) | |
39 | return -1; | |
40 | if (a->fd > b->fd) | |
41 | return +1; | |
42 | return 0; | |
43 | } | |
44 | static int agent_connfind(void *av, void *bv) | |
45 | { | |
46 | int afd = *(int *) av; | |
47 | struct agent_connection *b = (struct agent_connection *) bv; | |
48 | if (afd < b->fd) | |
49 | return -1; | |
50 | if (afd > b->fd) | |
51 | return +1; | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static int agent_select_result(int fd, int event) | |
56 | { | |
57 | int ret; | |
58 | struct agent_connection *conn; | |
59 | ||
60 | assert(event == 1); /* not selecting for anything but R */ | |
61 | ||
62 | conn = find234(agent_connections, &fd, agent_connfind); | |
63 | if (!conn) { | |
64 | uxsel_del(fd); | |
65 | return 1; | |
66 | } | |
67 | ||
68 | ret = read(fd, conn->retbuf+conn->retlen, conn->retsize-conn->retlen); | |
69 | if (ret <= 0) { | |
70 | if (conn->retbuf != conn->sizebuf) sfree(conn->retbuf); | |
71 | conn->retbuf = NULL; | |
72 | conn->retlen = 0; | |
73 | goto done; | |
74 | } | |
75 | conn->retlen += ret; | |
76 | if (conn->retsize == 4 && conn->retlen == 4) { | |
77 | conn->retsize = GET_32BIT(conn->retbuf); | |
78 | if (conn->retsize <= 0) { | |
79 | conn->retbuf = NULL; | |
80 | conn->retlen = 0; | |
81 | goto done; | |
82 | } | |
83 | conn->retsize += 4; | |
84 | assert(conn->retbuf == conn->sizebuf); | |
85 | conn->retbuf = snewn(conn->retsize, char); | |
86 | memcpy(conn->retbuf, conn->sizebuf, 4); | |
87 | } | |
88 | ||
89 | if (conn->retlen < conn->retsize) | |
90 | return 0; /* more data to come */ | |
91 | ||
92 | done: | |
93 | /* | |
94 | * We have now completed the agent query. Do the callback, and | |
95 | * clean up. (Of course we don't free retbuf, since ownership | |
96 | * of that passes to the callback.) | |
97 | */ | |
98 | conn->callback(conn->callback_ctx, conn->retbuf, conn->retlen); | |
99 | uxsel_del(fd); | |
100 | close(fd); | |
101 | del234(agent_connections, conn); | |
102 | sfree(conn); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | int agent_query(void *in, int inlen, void **out, int *outlen, | |
107 | void (*callback)(void *, void *, int), void *callback_ctx) | |
108 | { | |
109 | char *name; | |
110 | int sock; | |
111 | struct sockaddr_un addr; | |
112 | int done; | |
113 | struct agent_connection *conn; | |
114 | ||
115 | name = getenv("SSH_AUTH_SOCK"); | |
116 | if (!name) | |
117 | goto failure; | |
118 | ||
119 | sock = socket(PF_UNIX, SOCK_STREAM, 0); | |
120 | if (sock < 0) { | |
121 | perror("socket(PF_UNIX)"); | |
122 | exit(1); | |
123 | } | |
124 | ||
125 | cloexec(sock); | |
126 | ||
127 | addr.sun_family = AF_UNIX; | |
128 | strncpy(addr.sun_path, name, sizeof(addr.sun_path)); | |
129 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) { | |
130 | close(sock); | |
131 | goto failure; | |
132 | } | |
133 | ||
134 | for (done = 0; done < inlen ;) { | |
135 | int ret = write(sock, (char *)in + done, inlen - done); | |
136 | if (ret <= 0) { | |
137 | close(sock); | |
138 | goto failure; | |
139 | } | |
140 | done += ret; | |
141 | } | |
142 | ||
143 | if (!agent_connections) | |
144 | agent_connections = newtree234(agent_conncmp); | |
145 | ||
146 | conn = snew(struct agent_connection); | |
147 | conn->fd = sock; | |
148 | conn->retbuf = conn->sizebuf; | |
149 | conn->retsize = 4; | |
150 | conn->retlen = 0; | |
151 | conn->callback = callback; | |
152 | conn->callback_ctx = callback_ctx; | |
153 | add234(agent_connections, conn); | |
154 | ||
155 | uxsel_set(sock, 1, agent_select_result); | |
156 | return 0; | |
157 | ||
158 | failure: | |
159 | *out = NULL; | |
160 | *outlen = 0; | |
161 | return 1; | |
162 | } |