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00020 #include "config.h"
00021 #include "lfs.h"
00022
00023 #include <sys/ioctl.h>
00024 #include <sys/socket.h>
00025 #include <sys/types.h>
00026 #include <unistd.h>
00027 #include <netinet/tcp.h>
00028 #include <netinet/in.h>
00029 #include <netdb.h>
00030 #include <stdio.h>
00031 #include <fcntl.h>
00032 #include <syslog.h>
00033 #include <stdlib.h>
00034 #include <sys/mount.h>
00035 #include <sys/mman.h>
00036 #include <errno.h>
00037 #include <getopt.h>
00038 #include <stdarg.h>
00039
00040 #include <linux/ioctl.h>
00041 #define MY_NAME "nbd_client"
00042 #include "cliserv.h"
00043
00044 #ifdef WITH_SDP
00045 #include <sdp_inet.h>
00046 #endif
00047
00048 int check_conn(char* devname, int do_print) {
00049 char buf[256];
00050 char* p;
00051 int fd;
00052 int len;
00053
00054 if(!strncmp(devname, "/dev/", 5)) {
00055 devname+=5;
00056 }
00057 if((p=strchr(devname, 'p'))) {
00058
00059 *p='\0';
00060 }
00061 snprintf(buf, 256, "/sys/block/%s/pid", devname);
00062 if((fd=open(buf, O_RDONLY))<0) {
00063 if(errno==ENOENT) {
00064 return 1;
00065 } else {
00066 return 2;
00067 }
00068 }
00069 len=read(fd, buf, 256);
00070 buf[len-1]='\0';
00071 if(do_print) printf("%s\n", buf);
00072 close (fd);
00073 return 0;
00074 }
00075
00076 int opennet(char *name, char* portstr, int sdp) {
00077 int sock;
00078 struct addrinfo hints;
00079 struct addrinfo *ai = NULL;
00080 struct addrinfo *rp = NULL;
00081 int e;
00082
00083 memset(&hints,'\0',sizeof(hints));
00084 hints.ai_family = AF_UNSPEC;
00085 hints.ai_socktype = SOCK_STREAM;
00086 hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV;
00087 hints.ai_protocol = IPPROTO_TCP;
00088
00089 e = getaddrinfo(name, portstr, &hints, &ai);
00090
00091 if(e != 0) {
00092 fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
00093 freeaddrinfo(ai);
00094 exit(EXIT_FAILURE);
00095 }
00096
00097 if(sdp) {
00098 #ifdef WITH_SDP
00099 if (ai->ai_family == AF_INET)
00100 ai->ai_family = AF_INET_SDP;
00101 else (ai->ai_family == AF_INET6)
00102 ai->ai_family = AF_INET6_SDP;
00103 #else
00104 err("Can't do SDP: I was not compiled with SDP support!");
00105 #endif
00106 }
00107
00108 for(rp = ai; rp != NULL; rp = rp->ai_next) {
00109 sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
00110
00111 if(sock == -1)
00112 continue;
00113
00114 if(connect(sock, rp->ai_addr, rp->ai_addrlen) != -1)
00115 break;
00116 }
00117
00118 if (rp == NULL)
00119 err("Socket failed: %m");
00120
00121 setmysockopt(sock);
00122
00123 freeaddrinfo(ai);
00124 return sock;
00125 }
00126
00127 void negotiate(int sock, u64 *rsize64, u32 *flags, char* name) {
00128 u64 magic, size64;
00129 uint16_t tmp;
00130 char buf[256] = "\0\0\0\0\0\0\0\0\0";
00131
00132 printf("Negotiation: ");
00133 if (read(sock, buf, 8) < 0)
00134 err("Failed/1: %m");
00135 if (strlen(buf)==0)
00136 err("Server closed connection");
00137 if (strcmp(buf, INIT_PASSWD))
00138 err("INIT_PASSWD bad");
00139 printf(".");
00140 if (read(sock, &magic, sizeof(magic)) < 0)
00141 err("Failed/2: %m");
00142 magic = ntohll(magic);
00143 if(name) {
00144 uint32_t opt;
00145 uint32_t namesize;
00146 uint32_t reserved = 0;
00147
00148 if (magic != opts_magic)
00149 err("Not enough opts_magic");
00150 printf(".");
00151 if(read(sock, &tmp, sizeof(uint16_t)) < 0) {
00152 err("Failed reading flags: %m");
00153 }
00154 *flags = ((u32)ntohs(tmp)) << 16;
00155
00156
00157 if (write(sock, &reserved, sizeof(reserved)) < 0)
00158 err("Failed/2.1: %m");
00159
00160
00161 magic = ntohll(opts_magic);
00162 if (write(sock, &magic, sizeof(magic)) < 0)
00163 err("Failed/2.2: %m");
00164 opt = ntohl(NBD_OPT_EXPORT_NAME);
00165 if (write(sock, &opt, sizeof(opt)) < 0)
00166 err("Failed/2.3: %m");
00167 namesize = (u32)strlen(name);
00168 namesize = ntohl(namesize);
00169 if (write(sock, &namesize, sizeof(namesize)) < 0)
00170 err("Failed/2.4: %m");
00171 if (write(sock, name, strlen(name)) < 0)
00172 err("Failed/2.4: %m");
00173 } else {
00174 if (magic != cliserv_magic)
00175 err("Not enough cliserv_magic");
00176 printf(".");
00177 }
00178
00179 if (read(sock, &size64, sizeof(size64)) < 0)
00180 err("Failed/3: %m\n");
00181 size64 = ntohll(size64);
00182
00183 #ifdef NBD_SET_SIZE_BLOCKS
00184 if ((size64>>12) > (uint64_t)~0UL) {
00185 printf("size = %luMB", (unsigned long)(size64>>20));
00186 err("Exported device is too big for me. Get 64-bit machine :-(\n");
00187 } else
00188 printf("size = %luMB", (unsigned long)(size64>>20));
00189 #else
00190 if (size64 > (~0UL >> 1)) {
00191 printf("size = %luKB", (unsigned long)(size64>>10));
00192 err("Exported device is too big. Get 64-bit machine or newer kernel :-(\n");
00193 } else
00194 printf("size = %lu", (unsigned long)(size64));
00195 #endif
00196
00197 if(!name) {
00198 if (read(sock, flags, sizeof(*flags)) < 0)
00199 err("Failed/4: %m\n");
00200 *flags = ntohl(*flags);
00201 } else {
00202 if(read(sock, &tmp, sizeof(tmp)) < 0)
00203 err("Failed/4: %m\n");
00204 *flags |= (uint32_t)ntohs(tmp);
00205 }
00206
00207 if (read(sock, &buf, 124) < 0)
00208 err("Failed/5: %m\n");
00209 printf("\n");
00210
00211 *rsize64 = size64;
00212 }
00213
00214 void setsizes(int nbd, u64 size64, int blocksize, u32 flags) {
00215 unsigned long size;
00216 int read_only = (flags & NBD_FLAG_READ_ONLY) ? 1 : 0;
00217
00218 #ifdef NBD_SET_SIZE_BLOCKS
00219 if (size64>>12 > (uint64_t)~0UL)
00220 err("Device too large.\n");
00221 else {
00222 int er;
00223 if (ioctl(nbd, NBD_SET_BLKSIZE, 4096UL) < 0)
00224 err("Ioctl/1.1a failed: %m\n");
00225 size = (unsigned long)(size64>>12);
00226 if ((er = ioctl(nbd, NBD_SET_SIZE_BLOCKS, size)) < 0)
00227 err("Ioctl/1.1b failed: %m\n");
00228 if (ioctl(nbd, NBD_SET_BLKSIZE, (unsigned long)blocksize) < 0)
00229 err("Ioctl/1.1c failed: %m\n");
00230 fprintf(stderr, "bs=%d, sz=%llu bytes\n", blocksize, 4096ULL*size);
00231 }
00232 #else
00233 if (size64 > (~0UL >> 1)) {
00234 err("Device too large.\n");
00235 } else {
00236 size = (unsigned long)size64;
00237 if (ioctl(nbd, NBD_SET_SIZE, size) < 0)
00238 err("Ioctl NBD_SET_SIZE failed: %m\n");
00239 }
00240 #endif
00241
00242 ioctl(nbd, NBD_CLEAR_SOCK);
00243
00244 if (ioctl(nbd, BLKROSET, (unsigned long) &read_only) < 0)
00245 err("Unable to set read-only attribute for device");
00246 }
00247
00248 void set_timeout(int nbd, int timeout) {
00249 if (timeout) {
00250 #ifdef NBD_SET_TIMEOUT
00251 if (ioctl(nbd, NBD_SET_TIMEOUT, (unsigned long)timeout) < 0)
00252 err("Ioctl NBD_SET_TIMEOUT failed: %m\n");
00253 fprintf(stderr, "timeout=%d\n", timeout);
00254 #else
00255 err("Ioctl NBD_SET_TIMEOUT cannot be called when compiled on a system that does not support it\n");
00256 #endif
00257 }
00258 }
00259
00260 void finish_sock(int sock, int nbd, int swap) {
00261 if (ioctl(nbd, NBD_SET_SOCK, sock) < 0)
00262 err("Ioctl NBD_SET_SOCK failed: %m\n");
00263
00264 if (swap)
00265 mlockall(MCL_CURRENT | MCL_FUTURE);
00266 }
00267
00268 void usage(char* errmsg, ...) {
00269 if(errmsg) {
00270 char tmp[256];
00271 va_list ap;
00272 va_start(ap, errmsg);
00273 snprintf(tmp, 256, "ERROR: %s\n\n", errmsg);
00274 vfprintf(stderr, errmsg, ap);
00275 va_end(ap);
00276 } else {
00277 fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
00278 }
00279 fprintf(stderr, "Usage: nbd-client host port nbd_device [-block-size|-b block size] [-timeout|-t timeout] [-swap|-s] [-sdp|-S] [-persist|-p] [-nofork|-n] [-name|-N name]\n");
00280 fprintf(stderr, "Or : nbd-client -d nbd_device\n");
00281 fprintf(stderr, "Or : nbd-client -c nbd_device\n");
00282 fprintf(stderr, "Or : nbd-client -h|--help\n");
00283 fprintf(stderr, "Default value for blocksize is 1024 (recommended for ethernet)\n");
00284 fprintf(stderr, "Allowed values for blocksize are 512,1024,2048,4096\n");
00285 fprintf(stderr, "Note, that kernel 2.4.2 and older ones do not work correctly with\n");
00286 fprintf(stderr, "blocksizes other than 1024 without patches\n");
00287 }
00288
00289 void disconnect(char* device) {
00290 int nbd = open(device, O_RDWR);
00291
00292 if (nbd < 0)
00293 err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
00294 printf("Disconnecting: que, ");
00295 if (ioctl(nbd, NBD_CLEAR_QUE)< 0)
00296 err("Ioctl failed: %m\n");
00297 printf("disconnect, ");
00298 #ifdef NBD_DISCONNECT
00299 if (ioctl(nbd, NBD_DISCONNECT)<0)
00300 err("Ioctl failed: %m\n");
00301 printf("sock, ");
00302 #else
00303 fprintf(stderr, "Can't disconnect: I was not compiled with disconnect support!\n" );
00304 exit(1);
00305 #endif
00306 if (ioctl(nbd, NBD_CLEAR_SOCK)<0)
00307 err("Ioctl failed: %m\n");
00308 printf("done\n");
00309 }
00310
00311 int main(int argc, char *argv[]) {
00312 char* port=NULL;
00313 int sock, nbd;
00314 int blocksize=1024;
00315 char *hostname=NULL;
00316 char *nbddev=NULL;
00317 int swap=0;
00318 int cont=0;
00319 int timeout=0;
00320 int sdp=0;
00321 int nofork=0;
00322 u64 size64;
00323 u32 flags;
00324 int c;
00325 int nonspecial=0;
00326 char* name=NULL;
00327 struct option long_options[] = {
00328 { "block-size", required_argument, NULL, 'b' },
00329 { "check", required_argument, NULL, 'c' },
00330 { "disconnect", required_argument, NULL, 'd' },
00331 { "help", no_argument, NULL, 'h' },
00332 { "name", required_argument, NULL, 'N' },
00333 { "nofork", no_argument, NULL, 'n' },
00334 { "persist", no_argument, NULL, 'p' },
00335 { "sdp", no_argument, NULL, 'S' },
00336 { "swap", no_argument, NULL, 's' },
00337 { "timeout", required_argument, NULL, 't' },
00338 { 0, 0, 0, 0 },
00339 };
00340
00341 logging();
00342
00343 while((c=getopt_long_only(argc, argv, "-b:c:d:hnN:pSst:", long_options, NULL))>=0) {
00344 switch(c) {
00345 case 1:
00346
00347 if(strchr(optarg, '=')) {
00348
00349
00350 fprintf(stderr, "WARNING: old-style command-line argument encountered. This is deprecated.\n");
00351 if(!strncmp(optarg, "bs=", 3)) {
00352 optarg+=3;
00353 goto blocksize;
00354 }
00355 if(!strncmp(optarg, "timeout=", 8)) {
00356 optarg+=8;
00357 goto timeout;
00358 }
00359 usage("unknown option %s encountered", optarg);
00360 exit(EXIT_FAILURE);
00361 }
00362 switch(nonspecial++) {
00363 case 0:
00364
00365 hostname=optarg;
00366 break;
00367 case 1:
00368
00369 if(!strtol(optarg, NULL, 0)) {
00370
00371 nbddev = optarg;
00372 nonspecial++;
00373 } else {
00374 port = optarg;
00375 if(name) {
00376 usage("port and name specified at the same time. This is not supported.");
00377 exit(EXIT_FAILURE);
00378 }
00379 }
00380 break;
00381 case 2:
00382
00383 nbddev = optarg;
00384 break;
00385 default:
00386 usage("too many non-option arguments specified");
00387 exit(EXIT_FAILURE);
00388 }
00389 break;
00390 case 'b':
00391 blocksize:
00392 blocksize=(int)strtol(optarg, NULL, 0);
00393 break;
00394 case 'c':
00395 return check_conn(optarg, 1);
00396 case 'd':
00397 disconnect(optarg);
00398 exit(EXIT_SUCCESS);
00399 case 'h':
00400 usage(NULL);
00401 exit(EXIT_SUCCESS);
00402 case 'n':
00403 nofork=1;
00404 break;
00405 case 'N':
00406 name=optarg;
00407 if(port) {
00408 usage("port and name specified at the same time. This is not supported.");
00409 exit(EXIT_FAILURE);
00410 }
00411 port = NBD_DEFAULT_PORT;
00412 break;
00413 case 'p':
00414 cont=1;
00415 break;
00416 case 's':
00417 swap=1;
00418 break;
00419 case 'S':
00420 sdp=1;
00421 break;
00422 case 't':
00423 timeout:
00424 timeout=strtol(optarg, NULL, 0);
00425 break;
00426 default:
00427 fprintf(stderr, "E: option eaten by 42 mice\n");
00428 exit(EXIT_FAILURE);
00429 }
00430 }
00431
00432 if((!port && !name) || !hostname || !nbddev) {
00433 usage("not enough information specified");
00434 exit(EXIT_FAILURE);
00435 }
00436
00437 nbd = open(nbddev, O_RDWR);
00438 if (nbd < 0)
00439 err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
00440 ++argv; --argc;
00441
00442 sock = opennet(hostname, port, sdp);
00443
00444 negotiate(sock, &size64, &flags, name);
00445 setsizes(nbd, size64, blocksize, flags);
00446 set_timeout(nbd, timeout);
00447 finish_sock(sock, nbd, swap);
00448
00449
00450
00451 #ifndef NOFORK
00452 if(!nofork) {
00453 if (daemon(0,0) < 0)
00454 err("Cannot detach from terminal");
00455 }
00456 #endif
00457 do {
00458 #ifndef NOFORK
00459 if (fork()) {
00460
00461
00462
00463
00464
00465
00466
00467
00468
00469
00470
00471 while(check_conn(nbddev, 0)) {
00472 sleep(1);
00473 }
00474 open(nbddev, O_RDONLY);
00475 exit(0);
00476 }
00477 #endif
00478
00479 if (ioctl(nbd, NBD_DO_IT) < 0) {
00480 fprintf(stderr, "Kernel call returned: %m");
00481 if(errno==EBADR) {
00482
00483
00484 cont=0;
00485 } else {
00486 if(cont) {
00487 u64 new_size;
00488 u32 new_flags;
00489
00490 fprintf(stderr, " Reconnecting\n");
00491 close(sock); close(nbd);
00492 sock = opennet(hostname, port, sdp);
00493 nbd = open(nbddev, O_RDWR);
00494 negotiate(sock, &new_size, &new_flags, name);
00495 if (size64 != new_size) {
00496 err("Size of the device changed. Bye");
00497 }
00498 setsizes(nbd, size64, blocksize,
00499 new_flags);
00500
00501 set_timeout(nbd, timeout);
00502 finish_sock(sock,nbd,swap);
00503 }
00504 }
00505 } else {
00506
00507
00508
00509 fprintf(stderr, "Kernel call returned.");
00510 cont=0;
00511 }
00512 } while(cont);
00513 printf("Closing: que, ");
00514 ioctl(nbd, NBD_CLEAR_QUE);
00515 printf("sock, ");
00516 ioctl(nbd, NBD_CLEAR_SOCK);
00517 printf("done\n");
00518 return 0;
00519 }