| 1 | /* |
| 2 | Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com> |
| 3 | |
| 4 | This program is free software; you can redistribute it and/or modify |
| 5 | it under the terms of the GNU Lesser General Public License as published by |
| 6 | the Free Software Foundation; either version 2.1 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public License |
| 15 | along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include <stdio.h> |
| 19 | #include <unistd.h> |
| 20 | #include <fcntl.h> |
| 21 | #include <poll.h> |
| 22 | #include <string.h> |
| 23 | #include <errno.h> |
| 24 | #include <rpc/xdr.h> |
| 25 | #include <arpa/inet.h> |
| 26 | #include <sys/ioctl.h> |
| 27 | #include "libnfs.h" |
| 28 | #include "libnfs-raw.h" |
| 29 | #include "libnfs-private.h" |
| 30 | #include "slist.h" |
| 31 | |
| 32 | static void set_nonblocking(int fd) |
| 33 | { |
| 34 | unsigned v; |
| 35 | v = fcntl(fd, F_GETFL, 0); |
| 36 | fcntl(fd, F_SETFL, v | O_NONBLOCK); |
| 37 | } |
| 38 | |
| 39 | int rpc_get_fd(struct rpc_context *rpc) |
| 40 | { |
| 41 | return rpc->fd; |
| 42 | } |
| 43 | |
| 44 | int rpc_which_events(struct rpc_context *rpc) |
| 45 | { |
| 46 | int events = rpc->is_connected ? POLLIN : POLLOUT; |
| 47 | |
| 48 | if (rpc->outqueue) { |
| 49 | events |= POLLOUT; |
| 50 | } |
| 51 | return events; |
| 52 | } |
| 53 | |
| 54 | static int rpc_write_to_socket(struct rpc_context *rpc) |
| 55 | { |
| 56 | ssize_t count; |
| 57 | |
| 58 | if (rpc == NULL) { |
| 59 | printf("trying to write to socket for NULL context\n"); |
| 60 | return -1; |
| 61 | } |
| 62 | if (rpc->fd == -1) { |
| 63 | printf("trying to write but not connected\n"); |
| 64 | return -2; |
| 65 | } |
| 66 | |
| 67 | while (rpc->outqueue != NULL) { |
| 68 | ssize_t total; |
| 69 | |
| 70 | total = rpc->outqueue->outdata.size; |
| 71 | |
| 72 | count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written); |
| 73 | if (count == -1) { |
| 74 | if (errno == EAGAIN || errno == EWOULDBLOCK) { |
| 75 | printf("socket would block, return from write to socket\n"); |
| 76 | return 0; |
| 77 | } |
| 78 | printf("Error when writing to socket :%s(%d)\n", strerror(errno), errno); |
| 79 | return -3; |
| 80 | } |
| 81 | |
| 82 | rpc->outqueue->written += count; |
| 83 | if (rpc->outqueue->written == total) { |
| 84 | struct rpc_pdu *pdu = rpc->outqueue; |
| 85 | |
| 86 | SLIST_REMOVE(&rpc->outqueue, pdu); |
| 87 | SLIST_ADD_END(&rpc->waitpdu, pdu); |
| 88 | } |
| 89 | } |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static int rpc_read_from_socket(struct rpc_context *rpc) |
| 94 | { |
| 95 | int available; |
| 96 | int size; |
| 97 | unsigned char *buf; |
| 98 | ssize_t count; |
| 99 | |
| 100 | if (ioctl(rpc->fd, FIONREAD, &available) != 0) { |
| 101 | rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno); |
| 102 | return -1; |
| 103 | } |
| 104 | if (available == 0) { |
| 105 | rpc_set_error(rpc, "Socket has been closed"); |
| 106 | return -2; |
| 107 | } |
| 108 | size = rpc->insize - rpc->inpos + available; |
| 109 | buf = malloc(size); |
| 110 | if (buf == NULL) { |
| 111 | rpc_set_error(rpc, "Out of memory: failed to allocate %d bytes for input buffer. Closing socket.", size); |
| 112 | return -3; |
| 113 | } |
| 114 | if (rpc->insize > rpc->inpos) { |
| 115 | memcpy(buf, rpc->inbuf + rpc->inpos, rpc->insize - rpc->inpos); |
| 116 | rpc->insize -= rpc->inpos; |
| 117 | rpc->inpos = 0; |
| 118 | } |
| 119 | |
| 120 | count = read(rpc->fd, buf + rpc->insize, available); |
| 121 | if (count == -1) { |
| 122 | if (errno == EINTR) { |
| 123 | free(buf); |
| 124 | buf = NULL; |
| 125 | return 0; |
| 126 | } |
| 127 | rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno); |
| 128 | free(buf); |
| 129 | buf = NULL; |
| 130 | return -4; |
| 131 | } |
| 132 | |
| 133 | if (rpc->inbuf != NULL) { |
| 134 | free(rpc->inbuf); |
| 135 | } |
| 136 | rpc->inbuf = (char *)buf; |
| 137 | rpc->insize += count; |
| 138 | |
| 139 | while (1) { |
| 140 | if (rpc->insize - rpc->inpos < 4) { |
| 141 | return 0; |
| 142 | } |
| 143 | count = rpc_get_pdu_size(rpc->inbuf + rpc->inpos); |
| 144 | if (rpc->insize + rpc->inpos < count) { |
| 145 | return 0; |
| 146 | } |
| 147 | if (rpc_process_pdu(rpc, rpc->inbuf + rpc->inpos, count) != 0) { |
| 148 | rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket"); |
| 149 | return -5; |
| 150 | } |
| 151 | rpc->inpos += count; |
| 152 | if (rpc->inpos == rpc->insize) { |
| 153 | free(rpc->inbuf); |
| 154 | rpc->inbuf = NULL; |
| 155 | rpc->insize = 0; |
| 156 | rpc->inpos = 0; |
| 157 | } |
| 158 | } |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | |
| 163 | |
| 164 | int rpc_service(struct rpc_context *rpc, int revents) |
| 165 | { |
| 166 | if (revents & POLLERR) { |
| 167 | int err = 0; |
| 168 | socklen_t err_size = sizeof(err); |
| 169 | |
| 170 | if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR, |
| 171 | &err, &err_size) != 0 || err != 0) { |
| 172 | if (err == 0) { |
| 173 | err = errno; |
| 174 | } |
| 175 | rpc_set_error(rpc, "rpc_service: socket error " |
| 176 | "%s(%d).", |
| 177 | strerror(err), err); |
| 178 | } else { |
| 179 | rpc_set_error(rpc, "rpc_service: POLLERR, " |
| 180 | "Unknown socket error."); |
| 181 | } |
| 182 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); |
| 183 | return -1; |
| 184 | } |
| 185 | if (revents & POLLHUP) { |
| 186 | printf("rpc_service: POLLHUP, socket error\n"); |
| 187 | rpc_set_error(rpc, "Socket failed with POLLHUP"); |
| 188 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); |
| 189 | return -2; |
| 190 | } |
| 191 | |
| 192 | if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) { |
| 193 | int err = 0; |
| 194 | socklen_t err_size = sizeof(err); |
| 195 | |
| 196 | if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR, |
| 197 | &err, &err_size) != 0 || err != 0) { |
| 198 | if (err == 0) { |
| 199 | err = errno; |
| 200 | } |
| 201 | rpc_set_error(rpc, "rpc_service: socket error " |
| 202 | "%s(%d) while connecting.", |
| 203 | strerror(err), err); |
| 204 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, |
| 205 | NULL, rpc->connect_data); |
| 206 | return -1; |
| 207 | } |
| 208 | |
| 209 | rpc->is_connected = 1; |
| 210 | rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data); |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | if (revents & POLLOUT && rpc->outqueue != NULL) { |
| 215 | if (rpc_write_to_socket(rpc) != 0) { |
| 216 | printf("write to socket failed\n"); |
| 217 | return -3; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | if (revents & POLLIN) { |
| 222 | if (rpc_read_from_socket(rpc) != 0) { |
| 223 | rpc_disconnect(rpc, rpc_get_error(rpc)); |
| 224 | return -4; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | |
| 232 | int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data) |
| 233 | { |
| 234 | struct sockaddr_storage s; |
| 235 | struct sockaddr_in *sin = (struct sockaddr_in *)&s; |
| 236 | int socksize; |
| 237 | |
| 238 | if (rpc->fd != -1) { |
| 239 | rpc_set_error(rpc, "Trying to connect while already connected"); |
| 240 | printf("%s\n", rpc->error_string); |
| 241 | return -1; |
| 242 | } |
| 243 | |
| 244 | sin->sin_family = AF_INET; |
| 245 | sin->sin_port = htons(port); |
| 246 | if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) { |
| 247 | rpc_set_error(rpc, "Not a valid server ip address"); |
| 248 | printf("%s\n", rpc->error_string); |
| 249 | return -2; |
| 250 | } |
| 251 | |
| 252 | switch (s.ss_family) { |
| 253 | case AF_INET: |
| 254 | socksize = sizeof(struct sockaddr_in); |
| 255 | #ifdef HAVE_SOCK_SIN_LEN |
| 256 | sin->sin_len = socksize; |
| 257 | #endif |
| 258 | rpc->fd = socket(AF_INET, SOCK_STREAM, 0); |
| 259 | break; |
| 260 | } |
| 261 | |
| 262 | if (rpc->fd == -1) { |
| 263 | rpc_set_error(rpc, "Failed to open socket"); |
| 264 | printf("%s\n", rpc->error_string); |
| 265 | return -3; |
| 266 | } |
| 267 | |
| 268 | rpc->connect_cb = cb; |
| 269 | rpc->connect_data = private_data; |
| 270 | |
| 271 | set_nonblocking(rpc->fd); |
| 272 | |
| 273 | if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) { |
| 274 | rpc_set_error(rpc, "connect() to server failed"); |
| 275 | printf("%s\n", rpc->error_string); |
| 276 | return -4; |
| 277 | } |
| 278 | |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | int rpc_disconnect(struct rpc_context *rpc, char *error) |
| 283 | { |
| 284 | if (rpc->fd != -1) { |
| 285 | close(rpc->fd); |
| 286 | } |
| 287 | rpc->fd = -1; |
| 288 | |
| 289 | rpc->is_connected = 0; |
| 290 | |
| 291 | rpc_error_all_pdus(rpc, error); |
| 292 | |
| 293 | return 0; |
| 294 | } |