#include <sys/mount.h>
#include <sys/mman.h>
#include <errno.h>
+#include <getopt.h>
#ifndef __GNUC__
#error I need GCC to work
char* p;
int fd;
int len;
+
if(!strncmp(devname, "/dev/", 5)) {
devname+=5;
}
mlockall(MCL_CURRENT | MCL_FUTURE);
}
+void usage(void) {
+ fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
+ fprintf(stderr, "Usage: nbd-client [bs=blocksize] [timeout=sec] host port nbd_device [-swap] [-sdp] [-persist] [-nofork]\n");
+ fprintf(stderr, "Or : nbd-client -d nbd_device\n");
+ fprintf(stderr, "Or : nbd-client -c nbd_device\n");
+ fprintf(stderr, "Default value for blocksize is 1024 (recommended for ethernet)\n");
+ fprintf(stderr, "Allowed values for blocksize are 512,1024,2048,4096\n"); /* will be checked in kernel :) */
+ fprintf(stderr, "Note, that kernel 2.4.2 and older ones do not work correctly with\n");
+ fprintf(stderr, "blocksizes other than 1024 without patches\n");
+}
+
+void disconnect(char* device) {
+ int nbd = open(device, O_RDWR);
+
+ if (nbd < 0)
+ err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
+ printf("Disconnecting: que, ");
+ if (ioctl(nbd, NBD_CLEAR_QUE)< 0)
+ err("Ioctl failed: %m\n");
+ printf("disconnect, ");
+#ifdef NBD_DISCONNECT
+ if (ioctl(nbd, NBD_DISCONNECT)<0)
+ err("Ioctl failed: %m\n");
+ printf("sock, ");
+#else
+ fprintf(stderr, "Can't disconnect: I was not compiled with disconnect support!\n" );
+ exit(1);
+#endif
+ if (ioctl(nbd, NBD_CLEAR_SOCK)<0)
+ err("Ioctl failed: %m\n");
+ printf("done\n");
+}
+
int main(int argc, char *argv[]) {
- int port, sock, nbd;
+ int port=0;
+ int sock, nbd;
int blocksize=1024;
- char *hostname, *nbddev;
+ char *hostname=NULL;
+ char *nbddev=NULL;
int swap=0;
int cont=0;
int timeout=0;
int nofork=0;
u64 size64;
u32 flags;
+ int i, c;
+ int nonspecial=0;
+ struct option long_options[] = {
+ { "block-size", required_argument, NULL, 'b' },
+ { "check", required_argument, NULL, 'c' },
+ { "disconnect", required_argument, NULL, 'd' },
+ { "help", no_argument, NULL, 'h' },
+ { "nofork", no_argument, NULL, 'n' },
+ { "persist", no_argument, NULL, 'p' },
+ { "sdp", no_argument, NULL, 'S' },
+ { "swap", no_argument, NULL, 's' },
+ { "timeout", required_argument, NULL, 't' },
+ };
logging();
- if (argc < 3) {
- errmsg:
- fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
- fprintf(stderr, "Usage: nbd-client [bs=blocksize] [timeout=sec] host port nbd_device [-swap] [-persist] [-nofork]\n");
- fprintf(stderr, "Or : nbd-client -d nbd_device\n");
- fprintf(stderr, "Or : nbd-client -c nbd_device\n");
- fprintf(stderr, "Default value for blocksize is 1024 (recommended for ethernet)\n");
- fprintf(stderr, "Allowed values for blocksize are 512,1024,2048,4096\n"); /* will be checked in kernel :) */
- fprintf(stderr, "Note, that kernel 2.4.2 and older ones do not work correctly with\n");
- fprintf(stderr, "blocksizes other than 1024 without patches\n");
- return 1;
- }
-
- ++argv; --argc; /* skip programname */
-
- if (strcmp(argv[0], "-d")==0) {
- nbd = open(argv[1], O_RDWR);
- if (nbd < 0)
- err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
- printf("Disconnecting: que, ");
- if (ioctl(nbd, NBD_CLEAR_QUE)< 0)
- err("Ioctl failed: %m\n");
- printf("disconnect, ");
-#ifdef NBD_DISCONNECT
- if (ioctl(nbd, NBD_DISCONNECT)<0)
- err("Ioctl failed: %m\n");
- printf("sock, ");
-#else
- fprintf(stderr, "Can't disconnect: I was not compiled with disconnect support!\n" );
- exit(1);
-#endif
- if (ioctl(nbd, NBD_CLEAR_SOCK)<0)
- err("Ioctl failed: %m\n");
- printf("done\n");
- return 0;
- }
- if(strcmp(argv[0], "-c")==0) {
- return check_conn(argv[1], 1);
- }
-
- if (strncmp(argv[0], "bs=", 3)==0) {
- blocksize=atoi(argv[0]+3);
- ++argv; --argc; /* skip blocksize */
+ while((c=getopt_long_only(argc, argv, "-b:c:d:hnpSst:", long_options, NULL))>=0) {
+ switch(c) {
+ case 1:
+ // non-option argument
+ if(strchr(optarg, '=')) {
+ // old-style 'bs=' or 'timeout='
+ // argument
+ fprintf(stderr, "WARNING: old-style command-line argument encountered. This is deprecated.\n");
+ if(!strncmp(optarg, "bs=", 3)) {
+ optarg+=3;
+ goto blocksize;
+ }
+ if(!strncmp(optarg, "timeout=", 8)) {
+ optarg+=8;
+ goto timeout;
+ }
+ fprintf(stderr, "ERROR: unknown option %s encountered\n", optarg);
+ exit(EXIT_FAILURE);
+ }
+ switch(nonspecial++) {
+ case 0:
+ // host
+ hostname=optarg;
+ break;
+ case 1:
+ // port
+ port = strtol(optarg, NULL, 0);
+ break;
+ case 2:
+ // device
+ nbddev = optarg;
+ break;
+ default:
+ fprintf(stderr, "ERROR: too many non-option arguments specified\n");
+ exit(EXIT_FAILURE);
+ }
+ break;
+ case 'b':
+ blocksize:
+ blocksize=(int)strtol(optarg, NULL, 0);
+ break;
+ case 'c':
+ check_conn(optarg, 1);
+ exit(EXIT_SUCCESS);
+ case 'd':
+ disconnect(optarg);
+ exit(EXIT_SUCCESS);
+ case 'h':
+ usage();
+ exit(EXIT_SUCCESS);
+ case 'n':
+ nofork=1;
+ break;
+ case 'p':
+ cont=1;
+ break;
+ case 's':
+ swap=1;
+ break;
+ case 'S':
+ sdp=1;
+ break;
+ case 't':
+ timeout:
+ timeout=strtol(optarg, NULL, 0);
+ break;
+ default:
+ fprintf(stderr, "E: option eaten by 42 mice\n");
+ exit(EXIT_FAILURE);
+ }
}
- if (strncmp(argv[0], "timeout=", 8)==0) {
- timeout=atoi(argv[0]+8);
- ++argv; --argc; /* skip timeout */
+ if(!port || !hostname || !nbddev) {
+ usage();
+ exit(EXIT_FAILURE);
}
-
- if (argc==0) goto errmsg;
- hostname=argv[0];
- ++argv; --argc; /* skip hostname */
-
- if (argc==0) goto errmsg;
- port = atoi(argv[0]);
- ++argv; --argc; /* skip port */
- if (argc==0) goto errmsg;
- nbddev = argv[0];
nbd = open(nbddev, O_RDWR);
if (nbd < 0)
err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
++argv; --argc; /* skip device */
- if (argc>3) goto errmsg;
- if (argc) {
- if(strncmp(argv[0], "-swap", 5)==0) {
- swap=1;
- ++argv;--argc;
- }
- }
- if (argc) {
- if(strncmp(argv[0], "-persist", 8)==0) {
- cont=1;
- ++argv;--argc;
- }
- }
- if (argc) {
- if(strncmp(argv[0], "-sdp", 4)==0) {
- sdp=1;
- ++argv;--argc;
- }
- }
- if (argc) {
- if(strncmp(argv[0], "-nofork", 7)==0) {
- nofork=1;
- ++argv;--argc;
- }
- }
- if(argc) goto errmsg;
sock = opennet(hostname, port, sdp);
- argv=NULL; argc=0; /* don't use it later suddenly */
negotiate(sock, &size64, &flags);
setsizes(nbd, size64, blocksize, flags);
#ifndef NOFORK
if(!nofork) daemon(0,0);
+#endif
do {
+#ifndef NOFORK
if (fork()) {
/* Due to a race, the kernel NBD driver cannot
* call for a reread of the partition table