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 GHashTable *children;
153 char pidfname[256]; /**< name of our PID file */
154 char pidftemplate[256]; /**< template to be used for the filename of the PID file */
155 char default_authname[] = SYSCONFDIR "/nbd-server/allow"; /**< default name of allow file */
158 * Types of virtuatlization
161 VIRT_NONE=0, /**< No virtualization */
162 VIRT_IPLIT, /**< Literal IP address as part of the filename */
163 VIRT_IPHASH, /**< Replacing all dots in an ip address by a / before
164 doing the same as in IPLIT */
165 VIRT_CIDR, /**< Every subnet in its own directory */
169 * Variables associated with a server.
172 gchar* exportname; /**< (unprocessed) filename of the file we're exporting */
173 off_t expected_size; /**< size of the exported file as it was told to
174 us through configuration */
175 gchar* listenaddr; /**< The IP address we're listening on */
176 unsigned int port; /**< port we're exporting this file at */
177 char* authname; /**< filename of the authorization file */
178 int flags; /**< flags associated with this exported file */
179 unsigned int timeout;/**< how long a connection may be idle
181 int socket; /**< The socket of this server. */
182 VIRT_STYLE virtstyle;/**< The style of virtualization, if any */
183 uint8_t cidrlen; /**< The length of the mask when we use
184 CIDR-style virtualization */
185 gchar* prerun; /**< command to be ran after connecting a client,
186 but before starting to serve */
187 gchar* postrun; /**< command that will be ran after the client
192 * Variables associated with a client socket.
195 int fhandle; /**< file descriptor */
196 off_t startoff; /**< starting offset of this file */
200 off_t exportsize; /**< size of the file we're exporting */
201 char *clientname; /**< peer */
202 char *exportname; /**< (processed) filename of the file we're exporting */
203 GArray *export; /**< array of FILE_INFO of exported files;
204 array size is always 1 unless we're
205 doing the multiple file option */
206 int net; /**< The actual client socket */
207 SERVER *server; /**< The server this client is getting data from */
208 char* difffilename; /**< filename of the copy-on-write file, if any */
209 int difffile; /**< filedescriptor of copyonwrite file. @todo
210 shouldn't this be an array too? (cfr export) Or
211 make -m and -c mutually exclusive */
212 u32 difffilelen; /**< number of pages in difffile */
213 u32 *difmap; /**< see comment on the global difmap for this one */
217 * Type of configuration file values
220 PARAM_INT, /**< This parameter is an integer */
221 PARAM_STRING, /**< This parameter is a string */
222 PARAM_BOOL, /**< This parameter is a boolean */
226 * Configuration file values
229 gchar *paramname; /**< Name of the parameter, as it appears in
231 gboolean required; /**< Whether this is a required (as opposed to
232 optional) parameter */
233 PARAM_TYPE ptype; /**< Type of the parameter. */
234 gpointer target; /**< Pointer to where the data of this
235 parameter should be written. If ptype is
236 PARAM_BOOL, the data is or'ed rather than
238 gint flagval; /**< Flag mask for this parameter in case ptype
243 * Check whether a client is allowed to connect. Works with an authorization
244 * file which contains one line per machine, no wildcards.
246 * @param opts The client who's trying to connect.
247 * @return 0 - authorization refused, 1 - OK
249 int authorized_client(CLIENT *opts) {
250 const char *ERRMSG="Invalid entry '%s' in authfile '%s', so, refusing all connections.";
255 struct in_addr client;
256 struct in_addr cltemp;
259 if ((f=fopen(opts->server->authname,"r"))==NULL) {
260 msg4(LOG_INFO,"Can't open authorization file %s (%s).",
261 opts->server->authname,strerror(errno)) ;
265 inet_aton(opts->clientname, &client);
266 while (fgets(line,LINELEN,f)!=NULL) {
267 if((tmp=index(line, '/'))) {
268 if(strlen(line)<=tmp-line) {
269 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
273 if(inet_aton(line,&addr)) {
274 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
277 len=strtol(tmp, NULL, 0);
278 addr.s_addr>>=32-len;
279 addr.s_addr<<=32-len;
280 memcpy(&cltemp,&client,sizeof(client));
281 cltemp.s_addr>>=32-len;
282 cltemp.s_addr<<=32-len;
283 if(addr.s_addr == cltemp.s_addr) {
287 if (strncmp(line,opts->clientname,strlen(opts->clientname))==0) {
297 * Read data from a file descriptor into a buffer
299 * @param f a file descriptor
300 * @param buf a buffer
301 * @param len the number of bytes to be read
303 inline void readit(int f, void *buf, size_t len) {
307 if ((res = read(f, buf, len)) <= 0)
308 err("Read failed: %m");
315 * Write data from a buffer into a filedescriptor
317 * @param f a file descriptor
318 * @param buf a buffer containing data
319 * @param len the number of bytes to be written
321 inline void writeit(int f, void *buf, size_t len) {
325 if ((res = write(f, buf, len)) <= 0)
326 err("Send failed: %m");
333 * Print out a message about how to use nbd-server. Split out to a separate
334 * function so that we can call it from multiple places
337 printf("This is nbd-server version " VERSION "\n");
338 printf("Usage: [ip:]port file_to_export [size][kKmM] [-l authorize_file] [-r] [-m] [-c] [-a timeout_sec] [-C configuration file] [-p PID file name] [-o section name]\n"
339 "\t-r|--read-only\t\tread only\n"
340 "\t-m|--multi-file\t\tmultiple file\n"
341 "\t-c|--copy-on-write\tcopy on write\n"
342 "\t-C|--config-file\tspecify an alternate configuration file\n"
343 "\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
344 "\t-a|--idle-time\t\tmaximum idle seconds; server terminates when\n\t\t\t\tidle time exceeded\n"
345 "\t-p|--pid-file\t\tspecify a filename to write our PID to\n"
346 "\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"
347 "\tif port is set to 0, stdin is used (for running from inetd)\n"
348 "\tif file_to_export contains '%%s', it is substituted with the IP\n"
349 "\t\taddress of the machine trying to connect\n"
350 "\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");
351 printf("Using configuration file %s\n", CFILE);
354 /* Dumps a config file section of the given SERVER*, and exits. */
355 void dump_section(SERVER* serve, gchar* section_header) {
356 printf("[%s]\n", section_header);
357 printf("\texportname = %s\n", serve->exportname);
358 printf("\tlistenaddr = %s\n", serve->listenaddr);
359 printf("\tport = %d\n", serve->port);
360 if(serve->flags & F_READONLY) {
361 printf("\treadonly = true\n");
363 if(serve->flags & F_MULTIFILE) {
364 printf("\tmultifile = true\n");
366 if(serve->flags & F_COPYONWRITE) {
367 printf("\tcopyonwrite = true\n");
369 if(serve->expected_size) {
370 printf("\tfilesize = %Ld\n", (long long int)serve->expected_size);
372 if(serve->authname) {
373 printf("\tauthfile = %s\n", serve->authname);
376 printf("\ttimeout = %d\n", serve->timeout);
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->host=g_strdup(addr_port[0]);
427 serve->host=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)atol(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);
482 serve->timeout=strtol(optarg, NULL, 0);
490 /* What's left: the port to export, the name of the to be exported
491 * file, and, optionally, the size of the file, in that order. */
498 g_critical("Need a complete configuration on the command line to output a config file section!");
501 dump_section(serve, section_header);
507 * Error codes for config file parsing
510 CFILE_NOTFOUND, /**< The configuration file is not found */
511 CFILE_MISSING_GENERIC, /**< The (required) group "generic" is missing */
512 CFILE_KEY_MISSING, /**< A (required) key is missing */
513 CFILE_VALUE_INVALID, /**< A value is syntactically invalid */
514 CFILE_VALUE_UNSUPPORTED,/**< A value is not supported in this build */
515 CFILE_PROGERR /**< Programmer error */
519 * Remove a SERVER from memory. Used from the hash table
521 void remove_server(gpointer s) {
525 g_free(server->exportname);
527 g_free(server->authname);
532 * Parse the config file.
534 * @param f the name of the config file
535 * @param e a GError. @see CFILE_ERRORS for what error values this function can
537 * @return a Array of SERVER* pointers, If the config file is empty or does not
538 * exist, returns an empty GHashTable; if the config file contains an
539 * error, returns NULL, and e is set appropriately
541 GArray* parse_cfile(gchar* f, GError** e) {
542 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
543 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
545 gchar *virtstyle=NULL;
547 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
548 { "port", TRUE, PARAM_INT, NULL, 0 },
549 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
550 { "timeout", FALSE, PARAM_INT, NULL, 0 },
551 { "filesize", FALSE, PARAM_INT, NULL, 0 },
552 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
553 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
554 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
555 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
556 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
557 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
558 { "autoreadonly", FALSE, PARAM_BOOL, NULL, F_AUTOREADONLY },
559 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
560 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
561 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
563 const int lp_size=15;
565 { "user", FALSE, PARAM_STRING, &runuser, 0 },
566 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
572 const char *err_msg=NULL;
580 errdomain = g_quark_from_string("parse_cfile");
581 cfile = g_key_file_new();
582 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
583 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
584 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
585 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file.");
586 g_key_file_free(cfile);
589 if(strcmp(g_key_file_get_start_group(cfile), "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.timeout);
601 lp[4].target=&(s.expected_size);
602 lp[5].target=&(virtstyle);
603 lp[6].target=&(s.prerun);
604 lp[7].target=&(s.postrun);
605 lp[8].target=lp[9].target=lp[10].target=
606 lp[11].target=lp[12].target=
607 lp[13].target=&(s.flags);
608 lp[14].target=&(s.listnaddr);
610 /* After the [generic] group, start parsing exports */
615 for(j=0;j<p_size;j++) {
616 g_assert(p[j].target != NULL);
617 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
620 *((gint*)p[j].target) =
621 g_key_file_get_integer(cfile,
627 *((gchar**)p[j].target) =
628 g_key_file_get_string(cfile,
634 value = g_key_file_get_boolean(cfile,
636 p[j].paramname, &err);
639 *((gint*)p[j].target) |= p[j].flagval;
641 *((gint*)p[j].target) &= ~(p[j].flagval);
647 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
649 /* Ignore not-found error for optional values */
653 err_msg = MISSING_REQUIRED_ERROR;
656 err_msg = DEFAULT_ERROR;
658 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
659 g_array_free(retval, TRUE);
661 g_key_file_free(cfile);
666 if(!strncmp(virtstyle, "none", 4)) {
667 s.virtstyle=VIRT_NONE;
668 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
669 s.virtstyle=VIRT_IPLIT;
670 } else if(!strncmp(virtstyle, "iphash", 6)) {
671 s.virtstyle=VIRT_IPHASH;
672 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
673 s.virtstyle=VIRT_CIDR;
674 if(strlen(virtstyle)<10) {
675 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
676 g_array_free(retval, TRUE);
677 g_key_file_free(cfile);
680 s.cidrlen=strtol(virtstyle+8, NULL, 0);
682 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
683 g_array_free(retval, TRUE);
684 g_key_file_free(cfile);
688 s.virtstyle=VIRT_IPLIT;
690 /* Don't need to free this, it's not our string */
692 /* Don't append values for the [generic] group */
694 g_array_append_val(retval, s);
697 if(s.flags & F_SDP) {
698 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
699 g_array_free(retval, TRUE);
700 g_key_file_free(cfile);
709 * Signal handler for SIGCHLD
710 * @param s the signal we're handling (must be SIGCHLD, or something
713 void sigchld_handler(int s) {
718 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
719 if(WIFEXITED(status)) {
720 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
722 i=g_hash_table_lookup(children, &pid);
724 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
726 DEBUG2("Removing %d from the list of children", pid);
727 g_hash_table_remove(children, &pid);
733 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
736 * @param value the value corresponding to the above key
737 * @param user_data a pointer which we always set to 1, so that we know what
740 void killchild(gpointer key, gpointer value, gpointer user_data) {
742 int *parent=user_data;
749 * Handle SIGTERM and dispatch it to our children
750 * @param s the signal we're handling (must be SIGTERM, or something
751 * is severely wrong).
753 void sigterm_handler(int s) {
756 g_hash_table_foreach(children, killchild, &parent);
766 * Detect the size of a file.
768 * @param fhandle An open filedescriptor
769 * @return the size of the file, or OFFT_MAX if detection was
772 off_t size_autodetect(int fhandle) {
774 unsigned long sectors;
775 struct stat stat_buf;
778 #ifdef HAVE_SYS_MOUNT_H
779 #ifdef HAVE_SYS_IOCTL_H
781 DEBUG("looking for export size with ioctl BLKGETSIZE\n");
782 if (!ioctl(fhandle, BLKGETSIZE, §ors) && sectors) {
783 es = (off_t)sectors * (off_t)512;
786 #endif /* BLKGETSIZE */
787 #endif /* HAVE_SYS_IOCTL_H */
788 #endif /* HAVE_SYS_MOUNT_H */
790 DEBUG("looking for fhandle size with fstat\n");
791 stat_buf.st_size = 0;
792 error = fstat(fhandle, &stat_buf);
794 if(stat_buf.st_size > 0)
795 return (off_t)stat_buf.st_size;
797 err("fstat failed: %m");
800 DEBUG("looking for fhandle size with lseek SEEK_END\n");
801 es = lseek(fhandle, (off_t)0, SEEK_END);
802 if (es > ((off_t)0)) {
805 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
808 err("Could not find size of exported block device: %m");
813 * Get the file handle and offset, given an export offset.
815 * @param export An array of export files
816 * @param a The offset to get corresponding file/offset for
817 * @param fhandle [out] File descriptor
818 * @param foffset [out] Offset into fhandle
819 * @param maxbytes [out] Tells how many bytes can be read/written
820 * from fhandle starting at foffset (0 if there is no limit)
821 * @return 0 on success, -1 on failure
823 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
824 /* Negative offset not allowed */
828 /* Binary search for last file with starting offset <= a */
831 int end = export->len - 1;
832 while( start <= end ) {
833 int mid = (start + end) / 2;
834 fi = g_array_index(export, FILE_INFO, mid);
835 if( fi.startoff < a ) {
837 } else if( fi.startoff > a ) {
845 /* end should never go negative, since first startoff is 0 and a >= 0 */
848 fi = g_array_index(export, FILE_INFO, end);
849 *fhandle = fi.fhandle;
850 *foffset = a - fi.startoff;
852 if( end+1 < export->len ) {
853 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
854 *maxbytes = fi_next.startoff - a;
861 * seek to a position in a file, with error handling.
862 * @param handle a filedescriptor
863 * @param a position to seek to
864 * @todo get rid of this; lastpoint is a global variable right now, but it
865 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
868 void myseek(int handle,off_t a) {
869 if (lseek(handle, a, SEEK_SET) < 0) {
870 err("Can not seek locally!\n");
875 * Write an amount of bytes at a given offset to the right file. This
876 * abstracts the write-side of the multiple file option.
878 * @param a The offset where the write should start
879 * @param buf The buffer to write from
880 * @param len The length of buf
881 * @param client The client we're serving for
882 * @return The number of bytes actually written, or -1 in case of an error
884 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
889 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
891 if(maxbytes && len > maxbytes)
894 DEBUG4("(WRITE to fd %d offset %Lu len %u), ", fhandle, foffset, len);
896 myseek(fhandle, foffset);
897 return write(fhandle, buf, len);
901 * Call rawexpwrite repeatedly until all data has been written.
902 * @return 0 on success, nonzero on failure
904 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
907 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
912 return (ret < 0 || len != 0);
916 * Read an amount of bytes at a given offset from the right file. This
917 * abstracts the read-side of the multiple files option.
919 * @param a The offset where the read should start
920 * @param buf A buffer to read into
921 * @param len The size of buf
922 * @param client The client we're serving for
923 * @return The number of bytes actually read, or -1 in case of an
926 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
931 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
933 if(maxbytes && len > maxbytes)
936 DEBUG4("(READ from fd %d offset %Lu len %u), ", fhandle, foffset, len);
938 myseek(fhandle, foffset);
939 return read(fhandle, buf, len);
943 * Call rawexpread repeatedly until all data has been read.
944 * @return 0 on success, nonzero on failure
946 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
949 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
954 return (ret < 0 || len != 0);
958 * Read an amount of bytes at a given offset from the right file. This
959 * abstracts the read-side of the copyonwrite stuff, and calls
960 * rawexpread() with the right parameters to do the actual work.
961 * @param a The offset where the read should start
962 * @param buf A buffer to read into
963 * @param len The size of buf
964 * @param client The client we're going to read for
965 * @return 0 on success, nonzero on failure
967 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
969 off_t mapcnt, mapl, maph, pagestart;
971 if (!(client->server->flags & F_COPYONWRITE))
972 return(rawexpread_fully(a, buf, len, client));
973 DEBUG3("Asked to read %d bytes at %Lu.\n", len, (unsigned long long)a);
975 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
977 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
978 pagestart=mapcnt*DIFFPAGESIZE;
980 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
981 len : (size_t)DIFFPAGESIZE-offset;
982 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
983 DEBUG3("Page %Lu is at %lu\n", (unsigned long long)mapcnt,
984 (unsigned long)(client->difmap[mapcnt]));
985 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
986 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
987 } else { /* the block is not there */
988 DEBUG2("Page %Lu is not here, we read the original one\n",
989 (unsigned long long)mapcnt);
990 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
992 len-=rdlen; a+=rdlen; buf+=rdlen;
998 * Write an amount of bytes at a given offset to the right file. This
999 * abstracts the write-side of the copyonwrite option, and calls
1000 * rawexpwrite() with the right parameters to do the actual work.
1002 * @param a The offset where the write should start
1003 * @param buf The buffer to write from
1004 * @param len The length of buf
1005 * @param client The client we're going to write for.
1006 * @return 0 on success, nonzero on failure
1008 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1009 char pagebuf[DIFFPAGESIZE];
1010 off_t mapcnt,mapl,maph;
1015 if (!(client->server->flags & F_COPYONWRITE))
1016 return(rawexpwrite_fully(a, buf, len, client));
1017 DEBUG3("Asked to write %d bytes at %Lu.\n", len, (unsigned long long)a);
1019 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1021 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1022 pagestart=mapcnt*DIFFPAGESIZE ;
1023 offset=a-pagestart ;
1024 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1025 len : (size_t)DIFFPAGESIZE-offset;
1027 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1028 DEBUG3("Page %Lu is at %lu\n", (unsigned long long)mapcnt,
1029 (unsigned long)(client->difmap[mapcnt])) ;
1030 myseek(client->difffile,
1031 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1032 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1033 } else { /* the block is not there */
1034 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1035 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1036 DEBUG3("Page %Lu is not here, we put it at %lu\n",
1037 (unsigned long long)mapcnt,
1038 (unsigned long)(client->difmap[mapcnt]));
1039 rdlen=DIFFPAGESIZE ;
1040 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1042 memcpy(pagebuf+offset,buf,wrlen) ;
1043 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1047 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1053 * Do the initial negotiation.
1055 * @param client The client we're negotiating with.
1057 void negotiate(CLIENT *client) {
1060 u32 flags = NBD_FLAG_HAS_FLAGS;
1062 memset(zeros, '\0', sizeof(zeros));
1063 if (write(client->net, INIT_PASSWD, 8) < 0)
1064 err("Negotiation failed: %m");
1065 cliserv_magic = htonll(cliserv_magic);
1066 if (write(client->net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
1067 err("Negotiation failed: %m");
1068 size_host = htonll((u64)(client->exportsize));
1069 if (write(client->net, &size_host, 8) < 0)
1070 err("Negotiation failed: %m");
1071 if (client->server->flags & F_READONLY)
1072 flags |= NBD_FLAG_READ_ONLY;
1073 flags = htonl(flags);
1074 if (write(client->net, &flags, 4) < 0)
1075 err("Negotiation failed: %m");
1076 if (write(client->net, zeros, 124) < 0)
1077 err("Negotiation failed: %m");
1080 /** sending macro. */
1081 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1083 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1085 * Serve a file to a single client.
1087 * @todo This beast needs to be split up in many tiny little manageable
1088 * pieces. Preferably with a chainsaw.
1090 * @param client The client we're going to serve to.
1091 * @return when the client disconnects
1093 int mainloop(CLIENT *client) {
1094 struct nbd_request request;
1095 struct nbd_reply reply;
1096 gboolean go_on=TRUE;
1101 DEBUG("Entering request loop!\n");
1102 reply.magic = htonl(NBD_REPLY_MAGIC);
1111 if (client->server->timeout)
1112 alarm(client->server->timeout);
1113 readit(client->net, &request, sizeof(request));
1114 request.from = ntohll(request.from);
1115 request.type = ntohl(request.type);
1117 if (request.type==NBD_CMD_DISC) {
1118 msg2(LOG_INFO, "Disconnect request received.");
1119 if (client->server->flags & F_COPYONWRITE) {
1120 if (client->difmap) g_free(client->difmap) ;
1121 close(client->difffile);
1122 unlink(client->difffilename);
1123 free(client->difffilename);
1129 len = ntohl(request.len);
1131 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1132 err("Not enough magic.");
1133 if (len > BUFSIZE + sizeof(struct nbd_reply))
1134 err("Request too big!");
1136 printf("%s from %Lu (%Lu) len %d, ", request.type ? "WRITE" :
1137 "READ", (unsigned long long)request.from,
1138 (unsigned long long)request.from / 512, len);
1140 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1141 if ((request.from + len) > (OFFT_MAX)) {
1142 DEBUG("[Number too large!]");
1143 ERROR(client, reply, EINVAL);
1147 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1149 ERROR(client, reply, EINVAL);
1153 if (request.type==NBD_CMD_WRITE) {
1154 DEBUG("wr: net->buf, ");
1155 readit(client->net, buf, len);
1156 DEBUG("buf->exp, ");
1157 if ((client->server->flags & F_READONLY) ||
1158 (client->server->flags & F_AUTOREADONLY)) {
1159 DEBUG("[WRITE to READONLY!]");
1160 ERROR(client, reply, EPERM);
1163 if (expwrite(request.from, buf, len, client)) {
1164 DEBUG("Write failed: %m" );
1165 ERROR(client, reply, errno);
1168 SEND(client->net, reply);
1174 DEBUG("exp->buf, ");
1175 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1176 DEBUG("Read failed: %m");
1177 ERROR(client, reply, errno);
1181 DEBUG("buf->net, ");
1182 memcpy(buf, &reply, sizeof(struct nbd_reply));
1183 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1190 * Set up client export array, which is an array of FILE_INFO.
1191 * Also, split a single exportfile into multiple ones, if that was asked.
1192 * @param client information on the client which we want to setup export for
1194 void setupexport(CLIENT* client) {
1196 off_t laststartoff = 0, lastsize = 0;
1197 int multifile = (client->server->flags & F_MULTIFILE);
1199 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1201 /* If multi-file, open as many files as we can.
1202 * If not, open exactly one file.
1203 * Calculate file sizes as we go to get total size. */
1207 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1210 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1212 tmpname=g_strdup(client->exportname);
1214 DEBUG2( "Opening %s\n", tmpname );
1215 fi.fhandle = open(tmpname, mode);
1216 if(fi.fhandle == -1 && mode == O_RDWR) {
1217 /* Try again because maybe media was read-only */
1218 fi.fhandle = open(tmpname, O_RDONLY);
1219 if(fi.fhandle != -1) {
1220 client->server->flags |= F_AUTOREADONLY;
1221 client->server->flags |= F_READONLY;
1224 if(fi.fhandle == -1) {
1225 if(multifile && i>0)
1227 err("Could not open exported file: %m");
1229 fi.startoff = laststartoff + lastsize;
1230 g_array_append_val(client->export, fi);
1233 /* Starting offset and size of this file will be used to
1234 * calculate starting offset of next file */
1235 laststartoff = fi.startoff;
1236 lastsize = size_autodetect(fi.fhandle);
1242 /* Set export size to total calculated size */
1243 client->exportsize = laststartoff + lastsize;
1245 /* Export size may be overridden */
1246 if(client->server->expected_size) {
1247 /* desired size must be <= total calculated size */
1248 if(client->server->expected_size > client->exportsize) {
1249 err("Size of exported file is too big\n");
1252 client->exportsize = client->server->expected_size;
1255 msg3(LOG_INFO, "Size of exported file/device is %Lu", (unsigned long long)client->exportsize);
1257 msg3(LOG_INFO, "Total number of files: %d", i);
1261 int copyonwrite_prepare(CLIENT* client) {
1263 if ((client->difffilename = malloc(1024))==NULL)
1264 err("Failed to allocate string for diff file name");
1265 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1267 client->difffilename[1023]='\0';
1268 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1269 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1270 if (client->difffile<0) err("Could not create diff file (%m)") ;
1271 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1272 err("Could not allocate memory") ;
1273 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1279 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1282 * @param command the command to be ran. Read from the config file
1283 * @param file the file name we're about to export
1285 int do_run(gchar* command, gchar* file) {
1289 if(command && *command) {
1290 cmd = g_strdup_printf(command, file);
1298 * Serve a connection.
1300 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1301 * follow the road map.
1303 * @param client a connected client
1305 void serveconnection(CLIENT *client) {
1306 if(do_run(client->server->prerun, client->exportname)) {
1309 setupexport(client);
1311 if (client->server->flags & F_COPYONWRITE) {
1312 copyonwrite_prepare(client);
1315 setmysockopt(client->net);
1318 do_run(client->server->postrun, client->exportname);
1322 * Find the name of the file we have to serve. This will use g_strdup_printf
1323 * to put the IP address of the client inside a filename containing
1324 * "%s" (in the form as specified by the "virtstyle" option). That name
1325 * is then written to client->exportname.
1327 * @param net A socket connected to an nbd client
1328 * @param client information about the client. The IP address in human-readable
1329 * format will be written to a new char* buffer, the address of which will be
1330 * stored in client->clientname.
1332 void set_peername(int net, CLIENT *client) {
1333 struct sockaddr_in addrin;
1334 struct sockaddr_in netaddr;
1335 size_t addrinlen = sizeof( addrin );
1341 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1342 err("getsockname failed: %m");
1343 peername = g_strdup(inet_ntoa(addrin.sin_addr));
1344 switch(client->server->virtstyle) {
1346 client->exportname=g_strdup(client->server->exportname);
1349 for(i=0;i<strlen(peername);i++) {
1350 if(peername[i]=='.') {
1355 client->exportname=g_strdup_printf(client->server->exportname, peername);
1358 memcpy(&netaddr, &addrin, addrinlen);
1359 netaddr.sin_addr.s_addr>>=32-(client->server->cidrlen);
1360 netaddr.sin_addr.s_addr<<=32-(client->server->cidrlen);
1361 netname = inet_ntoa(netaddr.sin_addr);
1362 tmp=g_strdup_printf("%s/%s", netname, peername);
1363 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1367 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1368 peername, client->exportname);
1369 client->clientname=g_strdup(peername);
1375 * @param data a pointer to pid_t which should be freed
1377 void destroy_pid_t(gpointer data) {
1382 * Loop through the available servers, and serve them. Never returns.
1384 int serveloop(GArray* servers) G_GNUC_NORETURN {
1385 struct sockaddr_in addrin;
1386 socklen_t addrinlen=sizeof(addrin);
1396 * Set up the master fd_set. The set of descriptors we need
1397 * to select() for never changes anyway and it buys us a *lot*
1398 * of time to only build this once. However, if we ever choose
1399 * to not fork() for clients anymore, we may have to revisit
1404 for(i=0;i<servers->len;i++) {
1405 sock=(g_array_index(servers, SERVER, i)).socket;
1406 FD_SET(sock, &mset);
1407 max=sock>max?sock:max;
1414 memcpy(&rset, &mset, sizeof(fd_set));
1417 if(select(max+1, &rset, NULL, NULL, &tv)>0) {
1419 for(i=0;i<servers->len;i++) {
1420 serve=&(g_array_index(servers, SERVER, i));
1421 if(FD_ISSET(serve->socket, &rset)) {
1422 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1425 client = g_malloc(sizeof(CLIENT));
1426 client->server=serve;
1427 client->exportsize=OFFT_MAX;
1429 set_peername(net, client);
1430 if (!authorized_client(client)) {
1431 msg2(LOG_INFO,"Unauthorized client") ;
1435 msg2(LOG_INFO,"Authorized client") ;
1436 pid=g_malloc(sizeof(pid_t));
1438 if ((*pid=fork())<0) {
1439 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1443 if (*pid>0) { /* parent */
1445 g_hash_table_insert(children, pid, pid);
1449 g_hash_table_destroy(children);
1450 for(i=0;i<servers->len;i++) {
1451 serve=g_array_index(servers, SERVER*, i);
1452 close(serve->socket);
1454 /* FALSE does not free the
1455 actual data. This is required,
1456 because the client has a
1457 direct reference into that
1458 data, and otherwise we get a
1460 g_array_free(servers, FALSE);
1462 msg2(LOG_INFO,"Starting to serve");
1463 serveconnection(client);
1472 * Connect a server's socket.
1474 * @param serve the server we want to connect.
1476 void setup_serve(SERVER *serve) {
1477 struct sockaddr_in addrin;
1478 struct sigaction sa;
1479 int addrinlen = sizeof(addrin);
1490 if ((serve->flags) && F_SDP) {
1494 if ((serve->socket = socket(af, SOCK_STREAM, IPPROTO_TCP)) < 0)
1497 /* lose the pesky "Address already in use" error message */
1498 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1499 err("setsockopt SO_REUSEADDR");
1501 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1502 err("setsockopt SO_KEEPALIVE");
1505 /* make the listening socket non-blocking */
1506 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1507 err("fcntl F_GETFL");
1509 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1510 err("fcntl F_SETFL O_NONBLOCK");
1513 DEBUG("Waiting for connections... bind, ");
1514 addrin.sin_family = AF_INET;
1516 if(serve->flags & F_SDP) {
1517 addrin.sin_family = AF_INET_SDP;
1520 addrin.sin_port = htons(serve->port);
1521 if(!inet_aton(serve->listenaddr, &(addrin.sin_addr.s_addr)))
1522 err("could not parse listen address");
1523 if (bind(serve->socket, (struct sockaddr *) &addrin, addrinlen) < 0)
1526 if (listen(serve->socket, 1) < 0)
1528 sa.sa_handler = sigchld_handler;
1529 sigemptyset(&sa.sa_mask);
1530 sa.sa_flags = SA_RESTART;
1531 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1532 err("sigaction: %m");
1533 sa.sa_handler = sigterm_handler;
1534 sigemptyset(&sa.sa_mask);
1535 sa.sa_flags = SA_RESTART;
1536 if(sigaction(SIGTERM, &sa, NULL) == -1)
1537 err("sigaction: %m");
1541 * Connect our servers.
1543 void setup_servers(GArray* servers) {
1546 for(i=0;i<servers->len;i++) {
1547 setup_serve(&(g_array_index(servers, SERVER, i)));
1549 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1553 * Go daemon (unless we specified at compile time that we didn't want this)
1554 * @param serve the first server of our configuration. If its port is zero,
1555 * then do not daemonize, because we're doing inetd then. This parameter
1556 * is only used to create a PID file of the form
1557 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1559 #if !defined(NODAEMON) && !defined(NOFORK)
1560 void daemonize(SERVER* serve) {
1563 if(serve && !(serve->port)) {
1569 if(!*pidftemplate) {
1571 strncpy(pidftemplate, "/var/run/server.%d.pid", 255);
1573 strncpy(pidftemplate, "/var/run/server.pid", 255);
1576 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1577 pidf=fopen(pidfname, "w");
1579 fprintf(pidf,"%d\n", (int)getpid());
1583 fprintf(stderr, "Not fatal; continuing");
1587 #define daemonize(serve)
1588 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1591 * Everything beyond this point (in the file) is run in non-daemon mode.
1592 * The stuff above daemonize() isn't.
1595 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN {
1596 g_message("Export of %s on port %d failed:", serve->exportname,
1602 * Set up user-ID and/or group-ID
1604 void dousers(void) {
1608 gr=getgrnam(rungroup);
1610 g_message("Invalid group name: %s", rungroup);
1613 if(setgid(gr->gr_gid)<0) {
1614 g_message("Could not set GID: %s", strerror(errno));
1619 pw=getpwnam(runuser);
1621 g_message("Invalid user name: %s", runuser);
1624 if(setuid(pw->pw_uid)<0) {
1625 g_message(LOG_DEBUG, "Could not set UID: %s", strerror(errno));
1632 * Main entry point...
1634 int main(int argc, char *argv[]) {
1639 if (sizeof( struct nbd_request )!=28) {
1640 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1644 memset(pidftemplate, '\0', 256);
1647 config_file_pos = g_strdup(CFILE);
1648 serve=cmdline(argc, argv);
1649 servers = parse_cfile(config_file_pos, &err);
1650 if(!servers || !servers->len) {
1651 g_warning("Could not parse config file: %s",
1652 err ? err->message : "Unknown error");
1655 g_array_append_val(servers, *serve);
1657 if (!(serve->port)) {
1660 /* You really should define ISSERVER if you're going to use
1661 * inetd mode, but if you don't, closing stdout and stderr
1662 * (which inetd had connected to the client socket) will let it
1666 open("/dev/null", O_WRONLY);
1667 open("/dev/null", O_WRONLY);
1669 client=g_malloc(sizeof(CLIENT));
1670 client->server=serve;
1672 client->exportsize=OFFT_MAX;
1673 set_peername(0,client);
1674 serveconnection(client);
1678 if((!serve) && (!servers||!servers->len)) {
1679 g_message("Nothing to do! Bye!");
1683 setup_servers(servers);