2 * Network Block Device - server
4 * Copyright 1996-1998 Pavel Machek, distribute under GPL
5 * <pavel@atrey.karlin.mff.cuni.cz>
6 * Copyright 2001-2004 Wouter Verhelst <wouter@debian.org>
7 * Copyright 2002 Anton Altaparmakov <aia21@cam.ac.uk>
9 * Version 1.0 - hopefully 64-bit-clean
10 * Version 1.1 - merging enhancements from Josh Parsons, <josh@coombs.anu.edu.au>
11 * Version 1.2 - autodetect size of block devices, thanx to Peter T. Breuer" <ptb@it.uc3m.es>
12 * Version 1.5 - can compile on Unix systems that don't have 64 bit integer
13 * type, or don't have 64 bit file offsets by defining FS_32BIT
14 * in compile options for nbd-server *only*. This can be done
15 * with make FSCHOICE=-DFS_32BIT nbd-server. (I don't have the
16 * original autoconf input file, or I would make it a configure
17 * option.) Ken Yap <ken@nlc.net.au>.
18 * Version 1.6 - fix autodetection of block device size and really make 64 bit
19 * clean on 32 bit machines. Anton Altaparmakov <aia21@cam.ac.uk>
20 * Version 2.0 - Version synchronised with client
21 * Version 2.1 - Reap zombie client processes when they exit. Removed
22 * (uncommented) the _IO magic, it's no longer necessary. Wouter
23 * Verhelst <wouter@debian.org>
24 * Version 2.2 - Auto switch to read-only mode (usefull for floppies).
25 * Version 2.3 - Fixed code so that Large File Support works. This
26 * removes the FS_32BIT compile-time directive; define
27 * _FILE_OFFSET_BITS=64 and _LARGEFILE_SOURCE if you used to be
28 * using FS_32BIT. This will allow you to use files >2GB instead of
29 * having to use the -m option. Wouter Verhelst <wouter@debian.org>
30 * Version 2.4 - Added code to keep track of children, so that we can
31 * properly kill them from initscripts. Add a call to daemon(),
32 * so that processes don't think they have to wait for us, which is
33 * interesting for initscripts as well. Wouter Verhelst
35 * Version 2.5 - Bugfix release: forgot to reset child_arraysize to
36 * zero after fork()ing, resulting in nbd-server going berserk
37 * when it receives a signal with at least one child open. Wouter
38 * Verhelst <wouter@debian.org>
39 * 10/10/2003 - Added socket option SO_KEEPALIVE (sf.net bug 819235);
40 * rectified type of mainloop::size_host (sf.net bugs 814435 and
41 * 817385); close the PID file after writing to it, so that the
42 * daemon can actually be found. Wouter Verhelst
44 * 10/10/2003 - Size of the data "size_host" was wrong and so was not
45 * correctly put in network endianness. Many types were corrected
46 * (size_t and off_t instead of int). <vspaceg@sourceforge.net>
47 * Version 2.6 - Some code cleanup.
48 * Version 2.7 - Better build system.
49 * 11/02/2004 - Doxygenified the source, modularized it a bit. Needs a
50 * lot more work, but this is a start. Wouter Verhelst
54 /* Includes LFS defines, which defines behaviours of some of the following
55 * headers, so must come before those */
58 #include <sys/types.h>
59 #include <sys/socket.h>
61 #include <sys/select.h> /* select */
62 #include <sys/wait.h> /* wait */
63 #ifdef HAVE_SYS_IOCTL_H
64 #include <sys/ioctl.h>
66 #include <sys/param.h>
67 #ifdef HAVE_SYS_MOUNT_H
68 #include <sys/mount.h> /* For BLKGETSIZE */
70 #include <signal.h> /* sigaction */
72 #include <netinet/tcp.h>
73 #include <netinet/in.h> /* sockaddr_in, htons, in_addr */
74 #include <netdb.h> /* hostent, gethostby*, getservby* */
81 #include <arpa/inet.h>
91 /* used in cliserv.h, so must come first */
92 #define MY_NAME "nbd_server"
95 /** Default position of the config file */
97 #define SYSCONFDIR "/etc"
99 #define CFILE SYSCONFDIR "/nbd-server/config"
101 /** Where our config file actually is */
102 gchar* config_file_pos;
104 /** What user we're running as */
106 /** What group we're running as */
107 gchar* rungroup=NULL;
109 /** Logging macros, now nothing goes to syslog unless you say ISSERVER */
111 #define msg2(a,b) syslog(a,b)
112 #define msg3(a,b,c) syslog(a,b,c)
113 #define msg4(a,b,c,d) syslog(a,b,c,d)
115 #define msg2(a,b) g_message(b)
116 #define msg3(a,b,c) g_message(b,c)
117 #define msg4(a,b,c,d) g_message(b,c,d)
120 /* Debugging macros */
123 #define DEBUG( a ) printf( a )
124 #define DEBUG2( a,b ) printf( a,b )
125 #define DEBUG3( a,b,c ) printf( a,b,c )
126 #define DEBUG4( a,b,c,d ) printf( a,b,c,d )
129 #define DEBUG2( a,b )
130 #define DEBUG3( a,b,c )
131 #define DEBUG4( a,b,c,d )
133 #ifndef PACKAGE_VERSION
134 #define PACKAGE_VERSION ""
137 * The highest value a variable of type off_t can reach. This is a signed
138 * integer, so set all bits except for the leftmost one.
140 #define OFFT_MAX ~((off_t)1<<(sizeof(off_t)*8-1))
141 #define LINELEN 256 /**< Size of static buffer used to read the
142 authorization file (yuck) */
143 #define BUFSIZE (1024*1024) /**< Size of buffer that can hold requests */
144 #define DIFFPAGESIZE 4096 /**< diff file uses those chunks */
145 #define F_READONLY 1 /**< flag to tell us a file is readonly */
146 #define F_MULTIFILE 2 /**< flag to tell us a file is exported using -m */
147 #define F_COPYONWRITE 4 /**< flag to tell us a file is exported using
149 #define F_AUTOREADONLY 8 /**< flag to tell us a file is set to autoreadonly */
150 #define F_SPARSE 16 /**< flag to tell us copyronwrite should use a sparse file */
151 #define F_SDP 32 /**< flag to tell us the export should be done using the Socket Direct Protocol for RDMA */
152 #define F_SYNC 64 /**< Whether to fsync() after a write */
153 GHashTable *children;
154 char pidfname[256]; /**< name of our PID file */
155 char pidftemplate[256]; /**< template to be used for the filename of the PID file */
156 char default_authname[] = SYSCONFDIR "/nbd-server/allow"; /**< default name of allow file */
159 * Types of virtuatlization
162 VIRT_NONE=0, /**< No virtualization */
163 VIRT_IPLIT, /**< Literal IP address as part of the filename */
164 VIRT_IPHASH, /**< Replacing all dots in an ip address by a / before
165 doing the same as in IPLIT */
166 VIRT_CIDR, /**< Every subnet in its own directory */
170 * Variables associated with a server.
173 gchar* exportname; /**< (unprocessed) filename of the file we're exporting */
174 off_t expected_size; /**< size of the exported file as it was told to
175 us through configuration */
176 gchar* listenaddr; /**< The IP address we're listening on */
177 unsigned int port; /**< port we're exporting this file at */
178 char* authname; /**< filename of the authorization file */
179 int flags; /**< flags associated with this exported file */
180 int socket; /**< The socket of this server. */
181 VIRT_STYLE virtstyle;/**< The style of virtualization, if any */
182 uint8_t cidrlen; /**< The length of the mask when we use
183 CIDR-style virtualization */
184 gchar* prerun; /**< command to be ran after connecting a client,
185 but before starting to serve */
186 gchar* postrun; /**< command that will be ran after the client
191 * Variables associated with a client socket.
194 int fhandle; /**< file descriptor */
195 off_t startoff; /**< starting offset of this file */
199 off_t exportsize; /**< size of the file we're exporting */
200 char *clientname; /**< peer */
201 char *exportname; /**< (processed) filename of the file we're exporting */
202 GArray *export; /**< array of FILE_INFO of exported files;
203 array size is always 1 unless we're
204 doing the multiple file option */
205 int net; /**< The actual client socket */
206 SERVER *server; /**< The server this client is getting data from */
207 char* difffilename; /**< filename of the copy-on-write file, if any */
208 int difffile; /**< filedescriptor of copyonwrite file. @todo
209 shouldn't this be an array too? (cfr export) Or
210 make -m and -c mutually exclusive */
211 u32 difffilelen; /**< number of pages in difffile */
212 u32 *difmap; /**< see comment on the global difmap for this one */
216 * Type of configuration file values
219 PARAM_INT, /**< This parameter is an integer */
220 PARAM_STRING, /**< This parameter is a string */
221 PARAM_BOOL, /**< This parameter is a boolean */
225 * Configuration file values
228 gchar *paramname; /**< Name of the parameter, as it appears in
230 gboolean required; /**< Whether this is a required (as opposed to
231 optional) parameter */
232 PARAM_TYPE ptype; /**< Type of the parameter. */
233 gpointer target; /**< Pointer to where the data of this
234 parameter should be written. If ptype is
235 PARAM_BOOL, the data is or'ed rather than
237 gint flagval; /**< Flag mask for this parameter in case ptype
242 * Check whether a client is allowed to connect. Works with an authorization
243 * file which contains one line per machine, no wildcards.
245 * @param opts The client who's trying to connect.
246 * @return 0 - authorization refused, 1 - OK
248 int authorized_client(CLIENT *opts) {
249 const char *ERRMSG="Invalid entry '%s' in authfile '%s', so, refusing all connections.";
254 struct in_addr client;
255 struct in_addr cltemp;
258 if ((f=fopen(opts->server->authname,"r"))==NULL) {
259 msg4(LOG_INFO,"Can't open authorization file %s (%s).",
260 opts->server->authname,strerror(errno)) ;
264 inet_aton(opts->clientname, &client);
265 while (fgets(line,LINELEN,f)!=NULL) {
266 if((tmp=index(line, '/'))) {
267 if(strlen(line)<=tmp-line) {
268 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
272 if(inet_aton(line,&addr)) {
273 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
276 len=strtol(tmp, NULL, 0);
277 addr.s_addr>>=32-len;
278 addr.s_addr<<=32-len;
279 memcpy(&cltemp,&client,sizeof(client));
280 cltemp.s_addr>>=32-len;
281 cltemp.s_addr<<=32-len;
282 if(addr.s_addr == cltemp.s_addr) {
286 if (strncmp(line,opts->clientname,strlen(opts->clientname))==0) {
296 * Read data from a file descriptor into a buffer
298 * @param f a file descriptor
299 * @param buf a buffer
300 * @param len the number of bytes to be read
302 inline void readit(int f, void *buf, size_t len) {
306 if ((res = read(f, buf, len)) <= 0) {
307 if(errno != EAGAIN) {
308 err("Read failed: %m");
318 * Write data from a buffer into a filedescriptor
320 * @param f a file descriptor
321 * @param buf a buffer containing data
322 * @param len the number of bytes to be written
324 inline void writeit(int f, void *buf, size_t len) {
328 if ((res = write(f, buf, len)) <= 0)
329 err("Send failed: %m");
336 * Print out a message about how to use nbd-server. Split out to a separate
337 * function so that we can call it from multiple places
340 printf("This is nbd-server version " VERSION "\n");
341 printf("Usage: [ip:]port file_to_export [size][kKmM] [-l authorize_file] [-r] [-m] [-c] [-C configuration file] [-p PID file name] [-o section name]\n"
342 "\t-r|--read-only\t\tread only\n"
343 "\t-m|--multi-file\t\tmultiple file\n"
344 "\t-c|--copy-on-write\tcopy on write\n"
345 "\t-C|--config-file\tspecify an alternate configuration file\n"
346 "\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
347 "\t-a|--idle-time\t\tmaximum idle seconds; server terminates when\n\t\t\t\tidle time exceeded\n"
348 "\t-p|--pid-file\t\tspecify a filename to write our PID to\n"
349 "\t-o|--output-config\toutput a config file section for what you\n\t\t\t\tspecified on the command line, with the\n\t\t\t\tspecified section name\n\n"
350 "\tif port is set to 0, stdin is used (for running from inetd)\n"
351 "\tif file_to_export contains '%%s', it is substituted with the IP\n"
352 "\t\taddress of the machine trying to connect\n"
353 "\tif ip is set, it contains the local IP address on which we're listening.\n\tif not, the server will listen on all local IP addresses\n");
354 printf("Using configuration file %s\n", CFILE);
357 /* Dumps a config file section of the given SERVER*, and exits. */
358 void dump_section(SERVER* serve, gchar* section_header) {
359 printf("[%s]\n", section_header);
360 printf("\texportname = %s\n", serve->exportname);
361 printf("\tlistenaddr = %s\n", serve->listenaddr);
362 printf("\tport = %d\n", serve->port);
363 if(serve->flags & F_READONLY) {
364 printf("\treadonly = true\n");
366 if(serve->flags & F_MULTIFILE) {
367 printf("\tmultifile = true\n");
369 if(serve->flags & F_COPYONWRITE) {
370 printf("\tcopyonwrite = true\n");
372 if(serve->expected_size) {
373 printf("\tfilesize = %lld\n", (long long int)serve->expected_size);
375 if(serve->authname) {
376 printf("\tauthfile = %s\n", serve->authname);
382 * Parse the command line.
384 * @param argc the argc argument to main()
385 * @param argv the argv argument to main()
387 SERVER* cmdline(int argc, char *argv[]) {
391 struct option long_options[] = {
392 {"read-only", no_argument, NULL, 'r'},
393 {"multi-file", no_argument, NULL, 'm'},
394 {"copy-on-write", no_argument, NULL, 'c'},
395 {"authorize-file", required_argument, NULL, 'l'},
396 {"idle-time", required_argument, NULL, 'a'},
397 {"config-file", required_argument, NULL, 'C'},
398 {"pid-file", required_argument, NULL, 'p'},
399 {"output-config", required_argument, NULL, 'o'},
406 gboolean do_output=FALSE;
407 gchar* section_header="";
413 serve=g_new0(SERVER, 1);
414 serve->authname = g_strdup(default_authname);
415 serve->virtstyle=VIRT_IPLIT;
416 while((c=getopt_long(argc, argv, "-a:C:cl:mo:rp:", long_options, &i))>=0) {
419 /* non-option argument */
420 switch(nonspecial++) {
422 addr_port=g_strsplit(optarg, ":", 2);
424 serve->port=strtol(addr_port[1], NULL, 0);
425 serve->listenaddr=g_strdup(addr_port[0]);
427 serve->listenaddr=g_strdup("0.0.0.0");
428 serve->port=strtol(addr_port[0], NULL, 0);
430 g_strfreev(addr_port);
433 serve->exportname = g_strdup(optarg);
434 if(serve->exportname[0] != '/') {
435 fprintf(stderr, "E: The to be exported file needs to be an absolute filename!\n");
440 last=strlen(optarg)-1;
442 if (suffix == 'k' || suffix == 'K' ||
443 suffix == 'm' || suffix == 'M')
445 es = (off_t)atoll(optarg);
453 serve->expected_size = es;
458 serve->flags |= F_READONLY;
461 serve->flags |= F_MULTIFILE;
465 section_header = g_strdup(optarg);
468 strncpy(pidftemplate, optarg, 256);
471 serve->flags |=F_COPYONWRITE;
474 g_free(config_file_pos);
475 config_file_pos=g_strdup(optarg);
478 g_free(serve->authname);
479 serve->authname=g_strdup(optarg);
487 /* What's left: the port to export, the name of the to be exported
488 * file, and, optionally, the size of the file, in that order. */
495 g_critical("Need a complete configuration on the command line to output a config file section!");
498 dump_section(serve, section_header);
504 * Error codes for config file parsing
507 CFILE_NOTFOUND, /**< The configuration file is not found */
508 CFILE_MISSING_GENERIC, /**< The (required) group "generic" is missing */
509 CFILE_KEY_MISSING, /**< A (required) key is missing */
510 CFILE_VALUE_INVALID, /**< A value is syntactically invalid */
511 CFILE_VALUE_UNSUPPORTED,/**< A value is not supported in this build */
512 CFILE_PROGERR, /**< Programmer error */
513 CFILE_NO_EXPORTS /**< A config file was specified that does not
514 define any exports */
518 * Remove a SERVER from memory. Used from the hash table
520 void remove_server(gpointer s) {
524 g_free(server->exportname);
526 g_free(server->authname);
531 * Parse the config file.
533 * @param f the name of the config file
534 * @param e a GError. @see CFILE_ERRORS for what error values this function can
536 * @return a Array of SERVER* pointers, If the config file is empty or does not
537 * exist, returns an empty GHashTable; if the config file contains an
538 * error, returns NULL, and e is set appropriately
540 GArray* parse_cfile(gchar* f, GError** e) {
541 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
542 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
544 gchar *virtstyle=NULL;
546 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
547 { "port", TRUE, PARAM_INT, NULL, 0 },
548 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
549 { "filesize", FALSE, PARAM_INT, NULL, 0 },
550 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
551 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
552 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
553 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
554 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
555 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
556 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
557 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
558 { "sync", FALSE, PARAM_BOOL, NULL, F_SYNC },
559 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
561 const int lp_size=sizeof(lp)/sizeof(PARAM);
563 { "user", FALSE, PARAM_STRING, &runuser, 0 },
564 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
567 int p_size=sizeof(gp)/sizeof(PARAM);
570 const char *err_msg=NULL;
579 errdomain = g_quark_from_string("parse_cfile");
580 cfile = g_key_file_new();
581 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
582 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
583 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
584 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file %s.", f);
585 g_key_file_free(cfile);
588 startgroup = g_key_file_get_start_group(cfile);
589 if(!startgroup || strcmp(startgroup, "generic")) {
590 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
591 g_key_file_free(cfile);
594 groups = g_key_file_get_groups(cfile, NULL);
595 for(i=0;groups[i];i++) {
596 memset(&s, '\0', sizeof(SERVER));
597 lp[0].target=&(s.exportname);
598 lp[1].target=&(s.port);
599 lp[2].target=&(s.authname);
600 lp[3].target=&(s.expected_size);
601 lp[4].target=&(virtstyle);
602 lp[5].target=&(s.prerun);
603 lp[6].target=&(s.postrun);
604 lp[7].target=lp[8].target=lp[9].target=
605 lp[10].target=lp[11].target=
606 lp[12].target=&(s.flags);
607 lp[13].target=&(s.listenaddr);
609 /* After the [generic] group, start parsing exports */
614 for(j=0;j<p_size;j++) {
615 g_assert(p[j].target != NULL);
616 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
619 *((gint*)p[j].target) =
620 g_key_file_get_integer(cfile,
626 *((gchar**)p[j].target) =
627 g_key_file_get_string(cfile,
633 value = g_key_file_get_boolean(cfile,
635 p[j].paramname, &err);
638 *((gint*)p[j].target) |= p[j].flagval;
640 *((gint*)p[j].target) &= ~(p[j].flagval);
646 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
648 /* Ignore not-found error for optional values */
652 err_msg = MISSING_REQUIRED_ERROR;
655 err_msg = DEFAULT_ERROR;
657 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
658 g_array_free(retval, TRUE);
660 g_key_file_free(cfile);
665 if(!strncmp(virtstyle, "none", 4)) {
666 s.virtstyle=VIRT_NONE;
667 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
668 s.virtstyle=VIRT_IPLIT;
669 } else if(!strncmp(virtstyle, "iphash", 6)) {
670 s.virtstyle=VIRT_IPHASH;
671 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
672 s.virtstyle=VIRT_CIDR;
673 if(strlen(virtstyle)<10) {
674 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
675 g_array_free(retval, TRUE);
676 g_key_file_free(cfile);
679 s.cidrlen=strtol(virtstyle+8, NULL, 0);
681 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
682 g_array_free(retval, TRUE);
683 g_key_file_free(cfile);
687 s.virtstyle=VIRT_IPLIT;
689 /* Don't need to free this, it's not our string */
691 /* Don't append values for the [generic] group */
694 s.listenaddr = g_strdup("0.0.0.0");
696 g_array_append_val(retval, s);
699 if(s.flags & F_SDP) {
700 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
701 g_array_free(retval, TRUE);
702 g_key_file_free(cfile);
708 g_set_error(e, errdomain, CFILE_NO_EXPORTS, "The config file does not specify any exports");
710 g_key_file_free(cfile);
715 * Signal handler for SIGCHLD
716 * @param s the signal we're handling (must be SIGCHLD, or something
719 void sigchld_handler(int s) {
724 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
725 if(WIFEXITED(status)) {
726 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
728 i=g_hash_table_lookup(children, &pid);
730 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
732 DEBUG2("Removing %d from the list of children", pid);
733 g_hash_table_remove(children, &pid);
739 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
742 * @param value the value corresponding to the above key
743 * @param user_data a pointer which we always set to 1, so that we know what
746 void killchild(gpointer key, gpointer value, gpointer user_data) {
748 int *parent=user_data;
755 * Handle SIGTERM and dispatch it to our children
756 * @param s the signal we're handling (must be SIGTERM, or something
757 * is severely wrong).
759 void sigterm_handler(int s) {
762 g_hash_table_foreach(children, killchild, &parent);
772 * Detect the size of a file.
774 * @param fhandle An open filedescriptor
775 * @return the size of the file, or OFFT_MAX if detection was
778 off_t size_autodetect(int fhandle) {
781 struct stat stat_buf;
784 #ifdef HAVE_SYS_MOUNT_H
785 #ifdef HAVE_SYS_IOCTL_H
787 DEBUG("looking for export size with ioctl BLKGETSIZE64\n");
788 if (!ioctl(fhandle, BLKGETSIZE64, bytes) && bytes) {
791 #endif /* BLKGETSIZE64 */
792 #endif /* HAVE_SYS_IOCTL_H */
793 #endif /* HAVE_SYS_MOUNT_H */
795 DEBUG("looking for fhandle size with fstat\n");
796 stat_buf.st_size = 0;
797 error = fstat(fhandle, &stat_buf);
799 if(stat_buf.st_size > 0)
800 return (off_t)stat_buf.st_size;
802 err("fstat failed: %m");
805 DEBUG("looking for fhandle size with lseek SEEK_END\n");
806 es = lseek(fhandle, (off_t)0, SEEK_END);
807 if (es > ((off_t)0)) {
810 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
813 err("Could not find size of exported block device: %m");
818 * Get the file handle and offset, given an export offset.
820 * @param export An array of export files
821 * @param a The offset to get corresponding file/offset for
822 * @param fhandle [out] File descriptor
823 * @param foffset [out] Offset into fhandle
824 * @param maxbytes [out] Tells how many bytes can be read/written
825 * from fhandle starting at foffset (0 if there is no limit)
826 * @return 0 on success, -1 on failure
828 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
829 /* Negative offset not allowed */
833 /* Binary search for last file with starting offset <= a */
836 int end = export->len - 1;
837 while( start <= end ) {
838 int mid = (start + end) / 2;
839 fi = g_array_index(export, FILE_INFO, mid);
840 if( fi.startoff < a ) {
842 } else if( fi.startoff > a ) {
850 /* end should never go negative, since first startoff is 0 and a >= 0 */
853 fi = g_array_index(export, FILE_INFO, end);
854 *fhandle = fi.fhandle;
855 *foffset = a - fi.startoff;
857 if( end+1 < export->len ) {
858 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
859 *maxbytes = fi_next.startoff - a;
866 * seek to a position in a file, with error handling.
867 * @param handle a filedescriptor
868 * @param a position to seek to
869 * @todo get rid of this; lastpoint is a global variable right now, but it
870 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
873 void myseek(int handle,off_t a) {
874 if (lseek(handle, a, SEEK_SET) < 0) {
875 err("Can not seek locally!\n");
880 * Write an amount of bytes at a given offset to the right file. This
881 * abstracts the write-side of the multiple file option.
883 * @param a The offset where the write should start
884 * @param buf The buffer to write from
885 * @param len The length of buf
886 * @param client The client we're serving for
887 * @return The number of bytes actually written, or -1 in case of an error
889 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
895 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
897 if(maxbytes && len > maxbytes)
900 DEBUG4("(WRITE to fd %d offset %llu len %u), ", fhandle, foffset, len);
902 myseek(fhandle, foffset);
903 retval = write(fhandle, buf, len);
904 if(client->server->flags & F_SYNC) {
911 * Call rawexpwrite repeatedly until all data has been written.
912 * @return 0 on success, nonzero on failure
914 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
917 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
922 return (ret < 0 || len != 0);
926 * Read an amount of bytes at a given offset from the right file. This
927 * abstracts the read-side of the multiple files option.
929 * @param a The offset where the read should start
930 * @param buf A buffer to read into
931 * @param len The size of buf
932 * @param client The client we're serving for
933 * @return The number of bytes actually read, or -1 in case of an
936 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
941 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
943 if(maxbytes && len > maxbytes)
946 DEBUG4("(READ from fd %d offset %llu len %u), ", fhandle, foffset, len);
948 myseek(fhandle, foffset);
949 return read(fhandle, buf, len);
953 * Call rawexpread repeatedly until all data has been read.
954 * @return 0 on success, nonzero on failure
956 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
959 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
964 return (ret < 0 || len != 0);
968 * Read an amount of bytes at a given offset from the right file. This
969 * abstracts the read-side of the copyonwrite stuff, and calls
970 * rawexpread() with the right parameters to do the actual work.
971 * @param a The offset where the read should start
972 * @param buf A buffer to read into
973 * @param len The size of buf
974 * @param client The client we're going to read for
975 * @return 0 on success, nonzero on failure
977 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
979 off_t mapcnt, mapl, maph, pagestart;
981 if (!(client->server->flags & F_COPYONWRITE))
982 return(rawexpread_fully(a, buf, len, client));
983 DEBUG3("Asked to read %d bytes at %llu.\n", len, (unsigned long long)a);
985 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
987 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
988 pagestart=mapcnt*DIFFPAGESIZE;
990 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
991 len : (size_t)DIFFPAGESIZE-offset;
992 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
993 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
994 (unsigned long)(client->difmap[mapcnt]));
995 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
996 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
997 } else { /* the block is not there */
998 DEBUG2("Page %llu is not here, we read the original one\n",
999 (unsigned long long)mapcnt);
1000 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
1002 len-=rdlen; a+=rdlen; buf+=rdlen;
1008 * Write an amount of bytes at a given offset to the right file. This
1009 * abstracts the write-side of the copyonwrite option, and calls
1010 * rawexpwrite() with the right parameters to do the actual work.
1012 * @param a The offset where the write should start
1013 * @param buf The buffer to write from
1014 * @param len The length of buf
1015 * @param client The client we're going to write for.
1016 * @return 0 on success, nonzero on failure
1018 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1019 char pagebuf[DIFFPAGESIZE];
1020 off_t mapcnt,mapl,maph;
1025 if (!(client->server->flags & F_COPYONWRITE))
1026 return(rawexpwrite_fully(a, buf, len, client));
1027 DEBUG3("Asked to write %d bytes at %llu.\n", len, (unsigned long long)a);
1029 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1031 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1032 pagestart=mapcnt*DIFFPAGESIZE ;
1033 offset=a-pagestart ;
1034 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1035 len : (size_t)DIFFPAGESIZE-offset;
1037 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1038 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1039 (unsigned long)(client->difmap[mapcnt])) ;
1040 myseek(client->difffile,
1041 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1042 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1043 } else { /* the block is not there */
1044 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1045 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1046 DEBUG3("Page %llu is not here, we put it at %lu\n",
1047 (unsigned long long)mapcnt,
1048 (unsigned long)(client->difmap[mapcnt]));
1049 rdlen=DIFFPAGESIZE ;
1050 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1052 memcpy(pagebuf+offset,buf,wrlen) ;
1053 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1057 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1063 * Do the initial negotiation.
1065 * @param client The client we're negotiating with.
1067 void negotiate(CLIENT *client) {
1070 u32 flags = NBD_FLAG_HAS_FLAGS;
1072 memset(zeros, '\0', sizeof(zeros));
1073 if (write(client->net, INIT_PASSWD, 8) < 0)
1074 err("Negotiation failed: %m");
1075 cliserv_magic = htonll(cliserv_magic);
1076 if (write(client->net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
1077 err("Negotiation failed: %m");
1078 size_host = htonll((u64)(client->exportsize));
1079 if (write(client->net, &size_host, 8) < 0)
1080 err("Negotiation failed: %m");
1081 if (client->server->flags & F_READONLY)
1082 flags |= NBD_FLAG_READ_ONLY;
1083 flags = htonl(flags);
1084 if (write(client->net, &flags, 4) < 0)
1085 err("Negotiation failed: %m");
1086 if (write(client->net, zeros, 124) < 0)
1087 err("Negotiation failed: %m");
1090 /** sending macro. */
1091 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1093 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1095 * Serve a file to a single client.
1097 * @todo This beast needs to be split up in many tiny little manageable
1098 * pieces. Preferably with a chainsaw.
1100 * @param client The client we're going to serve to.
1101 * @return when the client disconnects
1103 int mainloop(CLIENT *client) {
1104 struct nbd_request request;
1105 struct nbd_reply reply;
1106 gboolean go_on=TRUE;
1111 DEBUG("Entering request loop!\n");
1112 reply.magic = htonl(NBD_REPLY_MAGIC);
1121 readit(client->net, &request, sizeof(request));
1122 request.from = ntohll(request.from);
1123 request.type = ntohl(request.type);
1125 if (request.type==NBD_CMD_DISC) {
1126 msg2(LOG_INFO, "Disconnect request received.");
1127 if (client->server->flags & F_COPYONWRITE) {
1128 if (client->difmap) g_free(client->difmap) ;
1129 close(client->difffile);
1130 unlink(client->difffilename);
1131 free(client->difffilename);
1137 len = ntohl(request.len);
1139 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1140 err("Not enough magic.");
1141 if (len > BUFSIZE + sizeof(struct nbd_reply))
1142 err("Request too big!");
1144 printf("%s from %llu (%llu) len %d, ", request.type ? "WRITE" :
1145 "READ", (unsigned long long)request.from,
1146 (unsigned long long)request.from / 512, len);
1148 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1149 if ((request.from + len) > (OFFT_MAX)) {
1150 DEBUG("[Number too large!]");
1151 ERROR(client, reply, EINVAL);
1155 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1157 ERROR(client, reply, EINVAL);
1161 if (request.type==NBD_CMD_WRITE) {
1162 DEBUG("wr: net->buf, ");
1163 readit(client->net, buf, len);
1164 DEBUG("buf->exp, ");
1165 if ((client->server->flags & F_READONLY) ||
1166 (client->server->flags & F_AUTOREADONLY)) {
1167 DEBUG("[WRITE to READONLY!]");
1168 ERROR(client, reply, EPERM);
1171 if (expwrite(request.from, buf, len, client)) {
1172 DEBUG("Write failed: %m" );
1173 ERROR(client, reply, errno);
1176 SEND(client->net, reply);
1182 DEBUG("exp->buf, ");
1183 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1184 DEBUG("Read failed: %m");
1185 ERROR(client, reply, errno);
1189 DEBUG("buf->net, ");
1190 memcpy(buf, &reply, sizeof(struct nbd_reply));
1191 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1198 * Set up client export array, which is an array of FILE_INFO.
1199 * Also, split a single exportfile into multiple ones, if that was asked.
1200 * @param client information on the client which we want to setup export for
1202 void setupexport(CLIENT* client) {
1204 off_t laststartoff = 0, lastsize = 0;
1205 int multifile = (client->server->flags & F_MULTIFILE);
1207 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1209 /* If multi-file, open as many files as we can.
1210 * If not, open exactly one file.
1211 * Calculate file sizes as we go to get total size. */
1215 gchar* error_string;
1216 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1219 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1221 tmpname=g_strdup(client->exportname);
1223 DEBUG2( "Opening %s\n", tmpname );
1224 fi.fhandle = open(tmpname, mode);
1225 if(fi.fhandle == -1 && mode == O_RDWR) {
1226 /* Try again because maybe media was read-only */
1227 fi.fhandle = open(tmpname, O_RDONLY);
1228 if(fi.fhandle != -1) {
1229 /* Opening the base file in copyonwrite mode is
1231 if(!(client->server->flags & F_COPYONWRITE)) {
1232 client->server->flags |= F_AUTOREADONLY;
1233 client->server->flags |= F_READONLY;
1237 if(fi.fhandle == -1) {
1238 if(multifile && i>0)
1240 error_string=g_strdup_printf(
1241 "Could not open exported file %s: %%m",
1245 fi.startoff = laststartoff + lastsize;
1246 g_array_append_val(client->export, fi);
1249 /* Starting offset and size of this file will be used to
1250 * calculate starting offset of next file */
1251 laststartoff = fi.startoff;
1252 lastsize = size_autodetect(fi.fhandle);
1258 /* Set export size to total calculated size */
1259 client->exportsize = laststartoff + lastsize;
1261 /* Export size may be overridden */
1262 if(client->server->expected_size) {
1263 /* desired size must be <= total calculated size */
1264 if(client->server->expected_size > client->exportsize) {
1265 err("Size of exported file is too big\n");
1268 client->exportsize = client->server->expected_size;
1271 msg3(LOG_INFO, "Size of exported file/device is %llu", (unsigned long long)client->exportsize);
1273 msg3(LOG_INFO, "Total number of files: %d", i);
1277 int copyonwrite_prepare(CLIENT* client) {
1279 if ((client->difffilename = malloc(1024))==NULL)
1280 err("Failed to allocate string for diff file name");
1281 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1283 client->difffilename[1023]='\0';
1284 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1285 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1286 if (client->difffile<0) err("Could not create diff file (%m)") ;
1287 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1288 err("Could not allocate memory") ;
1289 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1295 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1298 * @param command the command to be ran. Read from the config file
1299 * @param file the file name we're about to export
1301 int do_run(gchar* command, gchar* file) {
1305 if(command && *command) {
1306 cmd = g_strdup_printf(command, file);
1314 * Serve a connection.
1316 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1317 * follow the road map.
1319 * @param client a connected client
1321 void serveconnection(CLIENT *client) {
1322 if(do_run(client->server->prerun, client->exportname)) {
1325 setupexport(client);
1327 if (client->server->flags & F_COPYONWRITE) {
1328 copyonwrite_prepare(client);
1331 setmysockopt(client->net);
1334 do_run(client->server->postrun, client->exportname);
1338 * Find the name of the file we have to serve. This will use g_strdup_printf
1339 * to put the IP address of the client inside a filename containing
1340 * "%s" (in the form as specified by the "virtstyle" option). That name
1341 * is then written to client->exportname.
1343 * @param net A socket connected to an nbd client
1344 * @param client information about the client. The IP address in human-readable
1345 * format will be written to a new char* buffer, the address of which will be
1346 * stored in client->clientname.
1348 void set_peername(int net, CLIENT *client) {
1349 struct sockaddr_in addrin;
1350 struct sockaddr_in netaddr;
1351 size_t addrinlen = sizeof( addrin );
1357 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1358 err("getsockname failed: %m");
1359 peername = g_strdup(inet_ntoa(addrin.sin_addr));
1360 switch(client->server->virtstyle) {
1362 client->exportname=g_strdup(client->server->exportname);
1365 for(i=0;i<strlen(peername);i++) {
1366 if(peername[i]=='.') {
1371 client->exportname=g_strdup_printf(client->server->exportname, peername);
1374 memcpy(&netaddr, &addrin, addrinlen);
1375 netaddr.sin_addr.s_addr>>=32-(client->server->cidrlen);
1376 netaddr.sin_addr.s_addr<<=32-(client->server->cidrlen);
1377 netname = inet_ntoa(netaddr.sin_addr);
1378 tmp=g_strdup_printf("%s/%s", netname, peername);
1379 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1383 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1384 peername, client->exportname);
1385 client->clientname=g_strdup(peername);
1391 * @param data a pointer to pid_t which should be freed
1393 void destroy_pid_t(gpointer data) {
1398 * Loop through the available servers, and serve them. Never returns.
1400 int serveloop(GArray* servers) {
1401 struct sockaddr_in addrin;
1402 socklen_t addrinlen=sizeof(addrin);
1411 * Set up the master fd_set. The set of descriptors we need
1412 * to select() for never changes anyway and it buys us a *lot*
1413 * of time to only build this once. However, if we ever choose
1414 * to not fork() for clients anymore, we may have to revisit
1419 for(i=0;i<servers->len;i++) {
1420 sock=(g_array_index(servers, SERVER, i)).socket;
1421 FD_SET(sock, &mset);
1422 max=sock>max?sock:max;
1429 memcpy(&rset, &mset, sizeof(fd_set));
1430 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1432 for(i=0;i<servers->len;i++) {
1433 serve=&(g_array_index(servers, SERVER, i));
1434 if(FD_ISSET(serve->socket, &rset)) {
1436 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1439 if((sock_flags = fcntl(net, F_GETFL, 0))==-1) {
1440 err("fcntl F_GETFL");
1442 if(fcntl(net, F_SETFL, sock_flags &~O_NONBLOCK)==-1) {
1443 err("fcntl F_SETFL ~O_NONBLOCK");
1445 client = g_malloc(sizeof(CLIENT));
1446 client->server=serve;
1447 client->exportsize=OFFT_MAX;
1449 set_peername(net, client);
1450 if (!authorized_client(client)) {
1451 msg2(LOG_INFO,"Unauthorized client") ;
1455 msg2(LOG_INFO,"Authorized client") ;
1456 pid=g_malloc(sizeof(pid_t));
1458 if ((*pid=fork())<0) {
1459 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1463 if (*pid>0) { /* parent */
1465 g_hash_table_insert(children, pid, pid);
1469 g_hash_table_destroy(children);
1470 for(i=0;i<servers->len;i++) {
1471 serve=&g_array_index(servers, SERVER, i);
1472 close(serve->socket);
1474 /* FALSE does not free the
1475 actual data. This is required,
1476 because the client has a
1477 direct reference into that
1478 data, and otherwise we get a
1480 g_array_free(servers, FALSE);
1482 msg2(LOG_INFO,"Starting to serve");
1483 serveconnection(client);
1492 * Connect a server's socket.
1494 * @param serve the server we want to connect.
1496 void setup_serve(SERVER *serve) {
1497 struct sockaddr_in addrin;
1498 struct sigaction sa;
1499 int addrinlen = sizeof(addrin);
1510 if ((serve->flags) && F_SDP) {
1514 if ((serve->socket = socket(af, SOCK_STREAM, IPPROTO_TCP)) < 0)
1517 /* lose the pesky "Address already in use" error message */
1518 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1519 err("setsockopt SO_REUSEADDR");
1521 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1522 err("setsockopt SO_KEEPALIVE");
1525 /* make the listening socket non-blocking */
1526 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1527 err("fcntl F_GETFL");
1529 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1530 err("fcntl F_SETFL O_NONBLOCK");
1533 DEBUG("Waiting for connections... bind, ");
1534 addrin.sin_family = AF_INET;
1536 if(serve->flags & F_SDP) {
1537 addrin.sin_family = AF_INET_SDP;
1540 addrin.sin_port = htons(serve->port);
1541 if(!inet_aton(serve->listenaddr, &(addrin.sin_addr)))
1542 err("could not parse listen address");
1543 if (bind(serve->socket, (struct sockaddr *) &addrin, addrinlen) < 0)
1546 if (listen(serve->socket, 1) < 0)
1548 sa.sa_handler = sigchld_handler;
1549 sigemptyset(&sa.sa_mask);
1550 sa.sa_flags = SA_RESTART;
1551 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1552 err("sigaction: %m");
1553 sa.sa_handler = sigterm_handler;
1554 sigemptyset(&sa.sa_mask);
1555 sa.sa_flags = SA_RESTART;
1556 if(sigaction(SIGTERM, &sa, NULL) == -1)
1557 err("sigaction: %m");
1561 * Connect our servers.
1563 void setup_servers(GArray* servers) {
1566 for(i=0;i<servers->len;i++) {
1567 setup_serve(&(g_array_index(servers, SERVER, i)));
1569 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1573 * Go daemon (unless we specified at compile time that we didn't want this)
1574 * @param serve the first server of our configuration. If its port is zero,
1575 * then do not daemonize, because we're doing inetd then. This parameter
1576 * is only used to create a PID file of the form
1577 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1579 #if !defined(NODAEMON) && !defined(NOFORK)
1580 void daemonize(SERVER* serve) {
1583 if(serve && !(serve->port)) {
1589 if(!*pidftemplate) {
1591 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1593 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1596 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1597 pidf=fopen(pidfname, "w");
1599 fprintf(pidf,"%d\n", (int)getpid());
1603 fprintf(stderr, "Not fatal; continuing");
1607 #define daemonize(serve)
1608 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1611 * Everything beyond this point (in the file) is run in non-daemon mode.
1612 * The stuff above daemonize() isn't.
1615 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1617 void serve_err(SERVER* serve, const char* msg) {
1618 g_message("Export of %s on port %d failed:", serve->exportname,
1624 * Set up user-ID and/or group-ID
1626 void dousers(void) {
1630 gr=getgrnam(rungroup);
1632 g_message("Invalid group name: %s", rungroup);
1635 if(setgid(gr->gr_gid)<0) {
1636 g_message("Could not set GID: %s", strerror(errno));
1641 pw=getpwnam(runuser);
1643 g_message("Invalid user name: %s", runuser);
1646 if(setuid(pw->pw_uid)<0) {
1647 g_message("Could not set UID: %s", strerror(errno));
1654 void glib_message_syslog_redirect(const gchar *log_domain,
1655 GLogLevelFlags log_level,
1656 const gchar *message,
1659 int level=LOG_DEBUG;
1663 case G_LOG_FLAG_FATAL:
1664 case G_LOG_LEVEL_CRITICAL:
1665 case G_LOG_LEVEL_ERROR:
1668 case G_LOG_LEVEL_WARNING:
1671 case G_LOG_LEVEL_MESSAGE:
1672 case G_LOG_LEVEL_INFO:
1675 case G_LOG_LEVEL_DEBUG:
1678 syslog(level, message);
1683 * Main entry point...
1685 int main(int argc, char *argv[]) {
1690 if (sizeof( struct nbd_request )!=28) {
1691 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1692 exit(EXIT_FAILURE) ;
1695 memset(pidftemplate, '\0', 256);
1698 config_file_pos = g_strdup(CFILE);
1699 serve=cmdline(argc, argv);
1700 servers = parse_cfile(config_file_pos, &err);
1703 g_array_append_val(servers, *serve);
1705 if (!(serve->port)) {
1708 /* You really should define ISSERVER if you're going to use
1709 * inetd mode, but if you don't, closing stdout and stderr
1710 * (which inetd had connected to the client socket) will let it
1714 open("/dev/null", O_WRONLY);
1715 open("/dev/null", O_WRONLY);
1716 g_log_set_default_handler( glib_message_syslog_redirect, NULL );
1718 client=g_malloc(sizeof(CLIENT));
1719 client->server=serve;
1721 client->exportsize=OFFT_MAX;
1722 set_peername(0,client);
1723 serveconnection(client);
1728 if(!servers || !servers->len) {
1729 g_warning("Could not parse config file: %s",
1730 err ? err->message : "Unknown error");
1733 if((!serve) && (!servers||!servers->len)) {
1734 g_message("Nothing to do! Bye!");
1738 setup_servers(servers);