#include <sys/mount.h>
#include <sys/mman.h>
#include <errno.h>
+#include <getopt.h>
+#include <stdarg.h>
#ifndef __GNUC__
#error I need GCC to work
char* p;
int fd;
int len;
+
if(!strncmp(devname, "/dev/", 5)) {
devname+=5;
}
return 0;
}
-int opennet(char *name, int port, int sdp) {
+int opennet(char *name, char* portstr, int sdp) {
int sock;
- char portstr[6];
struct addrinfo hints;
struct addrinfo *ai = NULL;
struct addrinfo *rp = NULL;
int e;
- snprintf(portstr, sizeof(portstr), "%d", port);
-
memset(&hints,'\0',sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
return sock;
}
-void negotiate(int sock, u64 *rsize64, u32 *flags) {
+void negotiate(int sock, u64 *rsize64, u32 *flags, char* name) {
u64 magic, size64;
+ uint16_t tmp;
char buf[256] = "\0\0\0\0\0\0\0\0\0";
printf("Negotiation: ");
if (read(sock, &magic, sizeof(magic)) < 0)
err("Failed/2: %m");
magic = ntohll(magic);
- if (magic != cliserv_magic)
- err("Not enough cliserv_magic");
- printf(".");
+ if(name) {
+ uint32_t opt;
+ uint32_t namesize;
+ uint32_t reserved = 0;
+
+ if (magic != opts_magic)
+ err("Not enough opts_magic");
+ printf(".");
+ if(read(sock, &tmp, sizeof(uint16_t)) < 0) {
+ err("Failed reading flags: %m");
+ }
+ *flags = ((u32)ntohs(tmp)) << 16;
+
+ /* reserved for future use*/
+ write(sock, &reserved, sizeof(reserved));
+
+ /* Write the export name that we're after */
+ magic = ntohll(opts_magic);
+ write(sock, &magic, sizeof(magic));
+ opt = ntohl(NBD_OPT_EXPORT_NAME);
+ write(sock, &opt, sizeof(opt));
+ namesize = (u32)strlen(name);
+ namesize = ntohl(namesize);
+ write(sock, &namesize, sizeof(namesize));
+ write(sock, name, strlen(name));
+ } else {
+ if (magic != cliserv_magic)
+ err("Not enough cliserv_magic");
+ printf(".");
+ }
if (read(sock, &size64, sizeof(size64)) < 0)
err("Failed/3: %m\n");
printf("size = %lu", (unsigned long)(size64));
#endif
- if (read(sock, flags, sizeof(*flags)) < 0)
- err("Failed/4: %m\n");
- *flags = ntohl(*flags);
+ if(!name) {
+ if (read(sock, flags, sizeof(*flags)) < 0)
+ err("Failed/4: %m\n");
+ *flags = ntohl(*flags);
+ } else {
+ if(read(sock, &tmp, sizeof(tmp)) < 0)
+ err("Failed/4: %m\n");
+ *flags |= (uint32_t)ntohs(tmp);
+ }
if (read(sock, &buf, 124) < 0)
err("Failed/5: %m\n");
mlockall(MCL_CURRENT | MCL_FUTURE);
}
+void usage(char* errmsg, ...) {
+ if(errmsg) {
+ char tmp[256];
+ va_list ap;
+ va_start(ap, errmsg);
+ snprintf(tmp, 256, "ERROR: %s\n\n", errmsg);
+ vfprintf(stderr, errmsg, ap);
+ va_end(ap);
+ } else {
+ fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
+ }
+ 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");
+ fprintf(stderr, "Or : nbd-client -d nbd_device\n");
+ fprintf(stderr, "Or : nbd-client -c nbd_device\n");
+ fprintf(stderr, "Or : nbd-client -h|--help\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;
+ char* port=NULL;
+ 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;
+ int c;
+ int nonspecial=0;
+ char* name=NULL;
+ 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' },
+ { "name", required_argument, NULL, 'N' },
+ { "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' },
+ { 0, 0, 0, 0 },
+ };
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:hnN:pSst:", 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;
+ }
+ usage("unknown option %s encountered", optarg);
+ exit(EXIT_FAILURE);
+ }
+ switch(nonspecial++) {
+ case 0:
+ // host
+ hostname=optarg;
+ break;
+ case 1:
+ // port
+ if(!strtol(optarg, NULL, 0)) {
+ // not parseable as a number, assume it's the device and we have a name
+ nbddev = optarg;
+ nonspecial++;
+ } else {
+ port = optarg;
+ if(name) {
+ usage("port and name specified at the same time. This is not supported.");
+ exit(EXIT_FAILURE);
+ }
+ }
+ break;
+ case 2:
+ // device
+ nbddev = optarg;
+ break;
+ default:
+ usage("too many non-option arguments specified");
+ exit(EXIT_FAILURE);
+ }
+ break;
+ case 'b':
+ blocksize:
+ blocksize=(int)strtol(optarg, NULL, 0);
+ break;
+ case 'c':
+ return check_conn(optarg, 1);
+ case 'd':
+ disconnect(optarg);
+ exit(EXIT_SUCCESS);
+ case 'h':
+ usage(NULL);
+ exit(EXIT_SUCCESS);
+ case 'n':
+ nofork=1;
+ break;
+ case 'N':
+ name=optarg;
+ if(port) {
+ usage("port and name specified at the same time. This is not supported.");
+ exit(EXIT_FAILURE);
+ }
+ port = NBD_DEFAULT_PORT;
+ 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 && !name) || !hostname || !nbddev) {
+ usage("not enough information specified");
+ 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>4) goto errmsg;
- for(i=0; i<4; i++) {
- 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);
+ negotiate(sock, &size64, &flags, name);
setsizes(nbd, size64, blocksize, flags);
set_timeout(nbd, timeout);
finish_sock(sock, nbd, swap);
close(sock); close(nbd);
sock = opennet(hostname, port, sdp);
nbd = open(nbddev, O_RDWR);
- negotiate(sock, &new_size, &new_flags);
+ negotiate(sock, &new_size, &new_flags, name);
if (size64 != new_size) {
err("Size of the device changed. Bye");
}