| 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 | |
| 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 | { |
| 23 | if (getenv("SSH_AUTH_SOCK") != NULL) |
| 24 | return TRUE; |
| 25 | return FALSE; |
| 26 | } |
| 27 | |
| 28 | void agent_query(void *in, int inlen, void **out, int *outlen) |
| 29 | { |
| 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); |
| 83 | retbuf = smalloc(retsize); |
| 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; |
| 96 | } |