yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * |
| 3 | * Copyright (C) 2000 Paul Davis, pdavis@lpccomp.bc.ca |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 18 | * |
| 19 | * |
| 20 | * This program acts as a bridge either between a socket(2) and a |
| 21 | * serial/parallel port or between a socket and a pseudo-tty. |
| 22 | */ |
| 23 | #include "../zlog_com.h" |
| 24 | |
| 25 | /** |
| 26 | * ºê¶¨Òå |
| 27 | */ |
| 28 | #define RECVBUF_MODEM_MAX_LEN 2048 |
| 29 | #define RECVBUF_SOCK_CLIENT_LEN 512 |
| 30 | |
| 31 | /** |
| 32 | * Íⲿ±äÁ¿ÒýÓà |
| 33 | */ |
| 34 | extern char* ptsname(int fd); |
| 35 | |
| 36 | /** |
| 37 | * Íⲿº¯ÊýÒýÓà |
| 38 | */ |
| 39 | extern int set_tty(int fd, char *settings); |
| 40 | |
| 41 | /** |
| 42 | * È«¾Ö±äÁ¿¶¨Òå |
| 43 | */ |
| 44 | struct sockaddr_in addr, remoteaddr; |
| 45 | int devfd; |
| 46 | int *remotefd; |
| 47 | char *machinename; |
| 48 | char *sttyparms; |
| 49 | char *sdevname; |
| 50 | char *linkname; |
| 51 | int sockfd = -1; |
| 52 | int port = 23000; |
| 53 | int debug = 0; |
| 54 | int isdaemon = 0; |
| 55 | int curConnects = 0; |
| 56 | int maxConnects = 1; |
| 57 | int writeonly; |
| 58 | |
| 59 | fd_set fdsread, fdsreaduse; |
| 60 | struct hostent *remotehost; |
| 61 | char devbuf[RECVBUF_MODEM_MAX_LEN]; |
| 62 | |
| 63 | /** |
| 64 | * ¾Ö²¿º¯ÊýÉùÃ÷ |
| 65 | */ |
| 66 | void zLogAgt_SigHandler(int sig); |
| 67 | int zLogAgt_connect_to(struct sockaddr_in *addr); |
| 68 | void usage(char *progname); |
| 69 | void link_slave(int fd); |
| 70 | |
| 71 | /** |
| 72 | * @brief ÐźŴ¦Àíº¯Êý |
| 73 | * @param[in] sigÐźÅÖµ |
| 74 | * @return VOID |
| 75 | * @note |
| 76 | * @see |
| 77 | */ |
| 78 | void zLogAgt_SigHandler(int sig) |
| 79 | { |
| 80 | int i; |
| 81 | |
| 82 | if (sockfd != -1) |
| 83 | close(sockfd); |
| 84 | |
| 85 | for (i=0; i<curConnects; i++) |
| 86 | close(remotefd[i]); |
| 87 | |
| 88 | if (devfd != -1) |
| 89 | close(devfd); |
| 90 | |
| 91 | if (linkname) |
| 92 | unlink(linkname); |
| 93 | |
| 94 | printf("Terminating on signal %d", sig); |
| 95 | exit(8); |
| 96 | } |
| 97 | |
| 98 | void link_slave(int fd) |
| 99 | { |
| 100 | char *slavename; |
| 101 | int status = grantpt(devfd); |
| 102 | if (status != -1) |
| 103 | status = unlockpt(devfd); |
| 104 | if (status != -1) { |
| 105 | slavename = ptsname(devfd); |
| 106 | if (slavename) { |
| 107 | // Safety first |
| 108 | unlink(linkname); |
| 109 | status = symlink(slavename, linkname); |
| 110 | } |
| 111 | else |
| 112 | status = -1; |
| 113 | } |
| 114 | if (status == -1) { |
| 115 | printf( "Cannot create link for pseudo-tty: %m"); |
| 116 | exit(9); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * @brief socketÍøÂçͨÐÅ´¦ÀíÁ÷³Ì |
| 122 | * @param[in] addr |
| 123 | * @return socket Ì×½Ó×Ö |
| 124 | * @note |
| 125 | * @see |
| 126 | */ |
| 127 | int zLogAgt_connect_to(struct sockaddr_in *addr) |
| 128 | { |
| 129 | int waitlogged = 0; |
| 130 | int stat; |
| 131 | int sockfd; |
| 132 | extern int errno; |
| 133 | |
| 134 | if (debug > 0) { |
| 135 | unsigned long ip = ntohl(addr->sin_addr.s_addr); |
| 136 | printf("Trying to connect to %d.%d.%d.%d", |
| 137 | (int)(ip>>24)&0xff, |
| 138 | (int)(ip>>16)&0xff, |
| 139 | (int)(ip>>8)&0xff, |
| 140 | (int)(ip>>0)&0xff); |
| 141 | } |
| 142 | |
| 143 | while (1) { |
| 144 | /* Open the socket for communications */ |
| 145 | sockfd = socket(AF_INET, SOCK_STREAM, 6); |
| 146 | |
| 147 | if (sockfd == -1) { |
| 148 | printf( "Can't open socket: %m"); |
| 149 | exit(10); |
| 150 | } |
| 151 | |
| 152 | /* Try to connect to the remote server, |
| 153 | if it fails, keep trying */ |
| 154 | |
| 155 | stat = connect(sockfd, (struct sockaddr*)addr, |
| 156 | sizeof(struct sockaddr_in)); |
| 157 | if (debug>1) |
| 158 | if (stat == -1) |
| 159 | printf( "Connect status %d, errno %d: %m\n", stat,errno); |
| 160 | else |
| 161 | printf( "Connect status %d\n", stat); |
| 162 | |
| 163 | if (stat == 0) |
| 164 | break; |
| 165 | /* Write a message to printf once */ |
| 166 | if (!waitlogged) { |
| 167 | printf( "Waiting for server on %s port %d: %m", machinename, port); |
| 168 | waitlogged = 1; |
| 169 | } |
| 170 | close(sockfd); |
| 171 | sleep(10); |
| 172 | } |
| 173 | if (waitlogged || debug > 0) |
| 174 | printf("Connected to server %s port %d", machinename, port); |
| 175 | |
| 176 | return sockfd; |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * main º¯Êý¶¨Òå |
| 181 | */ |
| 182 | /** |
| 183 | * @brief net <-> serial ģʽÖ÷´¦Àíº¯Êý |
| 184 | * @param[in] usb É豸Îļþ¾ä±ú |
| 185 | * @return Á÷³Ì´¦Àí½á¹û |
| 186 | * @note |
| 187 | * @see |
| 188 | */ |
| 189 | int zLogAgt_NetSerial_Main(int fd_usb) |
| 190 | { |
| 191 | int result; |
| 192 | extern char *optarg; |
| 193 | extern int optind; |
| 194 | int maxfd = -1; |
| 195 | int devbytes; |
| 196 | int remoteaddrlen; |
| 197 | int waitlogged = 0; |
| 198 | register int i; |
| 199 | |
| 200 | PRINTF_DBG_INFO("Net and Serial Enter\n"); |
| 201 | |
| 202 | printf("sdevname=%s, port=%d, stty=%s\n",sdevname,port,sttyparms);//sdevname=/dev/ttyUSB0, port=23000, stty=921600 raw, optind=5 |
| 203 | |
| 204 | devfd = fd_usb; |
| 205 | |
| 206 | signal(SIGINT, zLogAgt_SigHandler); |
| 207 | signal(SIGHUP, zLogAgt_SigHandler); |
| 208 | signal(SIGTERM, zLogAgt_SigHandler); |
| 209 | |
| 210 | remotefd = (int *) malloc (maxConnects * sizeof(int)); |
| 211 | openlog("remserial", LOG_PID, LOG_USER); |
| 212 | |
| 213 | if (linkname) |
| 214 | link_slave(devfd); |
| 215 | |
| 216 | /* remserial -r server-name -p 23000 -s "9600 raw" /dev/ttyS0 */ |
| 217 | if (machinename) { |
| 218 | /* We are the client, |
| 219 | Find the IP address for the remote machine */ |
| 220 | remotehost = gethostbyname(machinename); |
| 221 | if (!remotehost) { |
| 222 | printf("Couldn't determine address of %s\n", machinename); |
| 223 | exit(3); |
| 224 | } |
| 225 | |
| 226 | /* Copy it into the addr structure */ |
| 227 | addr.sin_family = AF_INET; |
| 228 | memcpy(&(addr.sin_addr), remotehost->h_addr_list[0], |
| 229 | sizeof(struct in_addr)); |
| 230 | addr.sin_port = htons(port); |
| 231 | |
| 232 | remotefd[curConnects++] = zLogAgt_connect_to(&addr); |
| 233 | } |
| 234 | else { |
| 235 | /* We are the server */ |
| 236 | /* Open the initial socket for communications */ |
| 237 | sockfd = socket(AF_INET, SOCK_STREAM, 6); |
| 238 | if (sockfd == -1) { |
| 239 | printf("Can't open socket: %m\n"); |
| 240 | exit(4); |
| 241 | } |
| 242 | |
| 243 | addr.sin_family = AF_INET; |
| 244 | //addr.sin_addr.s_addr = 0; |
| 245 | addr.sin_port = htons(port); |
| 246 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
| 247 | |
| 248 | /* Set up to listen on the given port */ |
| 249 | if(bind(sockfd, (struct sockaddr*)(&addr), |
| 250 | sizeof(struct sockaddr_in)) < 0) { |
| 251 | printf("Couldn't bind port %d, aborting: %m",port); |
| 252 | exit(5); |
| 253 | } |
| 254 | if (debug > 1) |
| 255 | printf("Bound port\n"); |
| 256 | |
| 257 | /* Tell the system we want to listen on this socket */ |
| 258 | result = listen(sockfd, 4); |
| 259 | if (result == -1) { |
| 260 | printf( "Socket listen failed: %m"); |
| 261 | exit(6); |
| 262 | } |
| 263 | |
| 264 | if (debug > 1) |
| 265 | printf("Done listen\n"); |
| 266 | } |
| 267 | |
| 268 | if (isdaemon) { |
| 269 | setsid(); |
| 270 | close(0); |
| 271 | close(1); |
| 272 | close(2); |
| 273 | } |
| 274 | |
| 275 | /* Set up the files/sockets for the select() call */ |
| 276 | if (sockfd != -1) { |
| 277 | FD_SET(sockfd, &fdsread); |
| 278 | if (sockfd >= maxfd) |
| 279 | maxfd = sockfd + 1; |
| 280 | } |
| 281 | |
| 282 | for (i = 0; i < curConnects; i++) { |
| 283 | FD_SET(remotefd[i], &fdsread); |
| 284 | if (remotefd[i] >= maxfd) |
| 285 | maxfd = remotefd[i] + 1; |
| 286 | } |
| 287 | |
| 288 | if (!writeonly) { |
| 289 | FD_SET(devfd, &fdsread); |
| 290 | if (devfd >= maxfd) |
| 291 | maxfd = devfd + 1; |
| 292 | } |
| 293 | |
| 294 | while (1) { |
| 295 | /* Wait for data from the listening socket, the device |
| 296 | or the remote connection */ |
| 297 | fdsreaduse = fdsread; |
| 298 | if (select(maxfd, &fdsreaduse, NULL, NULL, NULL) == -1) |
| 299 | break; |
| 300 | |
| 301 | /* Activity on the controlling socket, only on server */ |
| 302 | if (!machinename && FD_ISSET(sockfd, &fdsreaduse)) { |
| 303 | int fd; |
| 304 | |
| 305 | /* Accept the remote systems attachment */ |
| 306 | remoteaddrlen = sizeof(struct sockaddr_in); |
| 307 | fd = accept(sockfd, (struct sockaddr*)(&remoteaddr), &remoteaddrlen); |
| 308 | |
| 309 | if (fd == -1) |
| 310 | printf("accept failed: \n"); |
| 311 | else if (curConnects < maxConnects) { |
| 312 | unsigned long ip; |
| 313 | remotefd[curConnects++] = fd; |
| 314 | /* Tell select to watch this new socket */ |
| 315 | FD_SET(fd, &fdsread); |
| 316 | if ( fd >= maxfd ) |
| 317 | maxfd = fd + 1; |
| 318 | ip = ntohl(remoteaddr.sin_addr.s_addr); |
| 319 | printf( "Connection from %d.%d.%d.%d\n", |
| 320 | (int)(ip>>24)&0xff, |
| 321 | (int)(ip>>16)&0xff, |
| 322 | (int)(ip>>8)&0xff, |
| 323 | (int)(ip>>0)&0xff); |
| 324 | } |
| 325 | else { |
| 326 | // Too many connections, just close it to reject |
| 327 | close(fd); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | /* Data to read from the device */ |
| 332 | if (FD_ISSET(devfd, &fdsreaduse)) { |
| 333 | devbytes = read(devfd, devbuf, RECVBUF_MODEM_MAX_LEN - 1); |
| 334 | |
| 335 | if (debug > 1) |
| 336 | printf("Device: %d bytes\n", devbytes); |
| 337 | if (devbytes <= 0) { |
| 338 | if (debug > 0) |
| 339 | printf("%s closed\n", sdevname); |
| 340 | close(devfd); |
| 341 | FD_CLR(devfd, &fdsread); |
| 342 | while (1) { |
| 343 | devfd = open(sdevname, O_RDWR); |
| 344 | if (devfd != -1) |
| 345 | break; |
| 346 | printf("Open of %s failed: %m\n", sdevname); |
| 347 | if (errno != EIO) |
| 348 | exit(7); |
| 349 | sleep(1); |
| 350 | } |
| 351 | if (debug > 0) |
| 352 | printf("%s re-opened", sdevname); |
| 353 | if (sttyparms) |
| 354 | set_tty(devfd, sttyparms); |
| 355 | if (linkname) |
| 356 | link_slave(devfd); |
| 357 | FD_SET(devfd, &fdsread); |
| 358 | if (devfd >= maxfd) |
| 359 | maxfd = devfd + 1; |
| 360 | } |
| 361 | else |
| 362 | for (i = 0; i < curConnects; i++) |
| 363 | write(remotefd[i], devbuf, devbytes); |
| 364 | } |
| 365 | |
| 366 | if (debug > 1) |
| 367 | printf("read Remotefd data start\n"); |
| 368 | /* Data to read from the remote system */ |
| 369 | for (i = 0; i < curConnects; i++) |
| 370 | if (FD_ISSET(remotefd[i], &fdsreaduse)) { |
| 371 | devbytes = read(remotefd[i], devbuf, RECVBUF_SOCK_CLIENT_LEN); |
| 372 | //if ( debug>1 && devbytes>0 ) |
| 373 | if (debug > 1) |
| 374 | printf("Remote: %d bytes", devbytes); |
| 375 | |
| 376 | if (devbytes == 0) { |
| 377 | register int j; |
| 378 | printf("Connection closed\n"); |
| 379 | close(remotefd[i]); |
| 380 | FD_CLR(remotefd[i], &fdsread); |
| 381 | curConnects--; |
| 382 | |
| 383 | for (j=i; j<curConnects; j++) |
| 384 | remotefd[j] = remotefd[j+1]; |
| 385 | |
| 386 | if (machinename) { |
| 387 | /* Wait for the server again */ |
| 388 | remotefd[curConnects++] = zLogAgt_connect_to(&addr); |
| 389 | FD_SET(remotefd[curConnects-1], &fdsread); |
| 390 | if (remotefd[curConnects-1] >= maxfd) |
| 391 | maxfd = remotefd[curConnects-1] + 1; |
| 392 | } |
| 393 | } |
| 394 | else if (devfd != -1) |
| 395 | /* Write the data to the device */ |
| 396 | write(devfd, devbuf, devbytes); |
| 397 | } |
| 398 | } |
| 399 | close(sockfd); |
| 400 | for (i=0; i<curConnects; i++) |
| 401 | close(remotefd[i]); |
| 402 | |
| 403 | return 0; |
| 404 | } |
| 405 | |