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->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)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 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
559 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
560 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
562 const int lp_size=15;
564 { "user", FALSE, PARAM_STRING, &runuser, 0 },
565 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
571 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.");
585 g_key_file_free(cfile);
588 if(strcmp(g_key_file_get_start_group(cfile), "generic")) {
589 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
590 g_key_file_free(cfile);
593 groups = g_key_file_get_groups(cfile, NULL);
594 for(i=0;groups[i];i++) {
595 memset(&s, '\0', sizeof(SERVER));
596 lp[0].target=&(s.exportname);
597 lp[1].target=&(s.port);
598 lp[2].target=&(s.authname);
599 lp[3].target=&(s.timeout);
600 lp[4].target=&(s.expected_size);
601 lp[5].target=&(virtstyle);
602 lp[6].target=&(s.prerun);
603 lp[7].target=&(s.postrun);
604 lp[8].target=lp[9].target=lp[10].target=
605 lp[11].target=lp[12].target=
606 lp[13].target=&(s.flags);
607 lp[14].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);
711 * Signal handler for SIGCHLD
712 * @param s the signal we're handling (must be SIGCHLD, or something
715 void sigchld_handler(int s) {
720 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
721 if(WIFEXITED(status)) {
722 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
724 i=g_hash_table_lookup(children, &pid);
726 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
728 DEBUG2("Removing %d from the list of children", pid);
729 g_hash_table_remove(children, &pid);
735 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
738 * @param value the value corresponding to the above key
739 * @param user_data a pointer which we always set to 1, so that we know what
742 void killchild(gpointer key, gpointer value, gpointer user_data) {
744 int *parent=user_data;
751 * Handle SIGTERM and dispatch it to our children
752 * @param s the signal we're handling (must be SIGTERM, or something
753 * is severely wrong).
755 void sigterm_handler(int s) {
758 g_hash_table_foreach(children, killchild, &parent);
768 * Detect the size of a file.
770 * @param fhandle An open filedescriptor
771 * @return the size of the file, or OFFT_MAX if detection was
774 off_t size_autodetect(int fhandle) {
776 unsigned long sectors;
777 struct stat stat_buf;
780 #ifdef HAVE_SYS_MOUNT_H
781 #ifdef HAVE_SYS_IOCTL_H
783 DEBUG("looking for export size with ioctl BLKGETSIZE\n");
784 if (!ioctl(fhandle, BLKGETSIZE, §ors) && sectors) {
785 es = (off_t)sectors * (off_t)512;
788 #endif /* BLKGETSIZE */
789 #endif /* HAVE_SYS_IOCTL_H */
790 #endif /* HAVE_SYS_MOUNT_H */
792 DEBUG("looking for fhandle size with fstat\n");
793 stat_buf.st_size = 0;
794 error = fstat(fhandle, &stat_buf);
796 if(stat_buf.st_size > 0)
797 return (off_t)stat_buf.st_size;
799 err("fstat failed: %m");
802 DEBUG("looking for fhandle size with lseek SEEK_END\n");
803 es = lseek(fhandle, (off_t)0, SEEK_END);
804 if (es > ((off_t)0)) {
807 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
810 err("Could not find size of exported block device: %m");
815 * Get the file handle and offset, given an export offset.
817 * @param export An array of export files
818 * @param a The offset to get corresponding file/offset for
819 * @param fhandle [out] File descriptor
820 * @param foffset [out] Offset into fhandle
821 * @param maxbytes [out] Tells how many bytes can be read/written
822 * from fhandle starting at foffset (0 if there is no limit)
823 * @return 0 on success, -1 on failure
825 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
826 /* Negative offset not allowed */
830 /* Binary search for last file with starting offset <= a */
833 int end = export->len - 1;
834 while( start <= end ) {
835 int mid = (start + end) / 2;
836 fi = g_array_index(export, FILE_INFO, mid);
837 if( fi.startoff < a ) {
839 } else if( fi.startoff > a ) {
847 /* end should never go negative, since first startoff is 0 and a >= 0 */
850 fi = g_array_index(export, FILE_INFO, end);
851 *fhandle = fi.fhandle;
852 *foffset = a - fi.startoff;
854 if( end+1 < export->len ) {
855 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
856 *maxbytes = fi_next.startoff - a;
863 * seek to a position in a file, with error handling.
864 * @param handle a filedescriptor
865 * @param a position to seek to
866 * @todo get rid of this; lastpoint is a global variable right now, but it
867 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
870 void myseek(int handle,off_t a) {
871 if (lseek(handle, a, SEEK_SET) < 0) {
872 err("Can not seek locally!\n");
877 * Write an amount of bytes at a given offset to the right file. This
878 * abstracts the write-side of the multiple file option.
880 * @param a The offset where the write should start
881 * @param buf The buffer to write from
882 * @param len The length of buf
883 * @param client The client we're serving for
884 * @return The number of bytes actually written, or -1 in case of an error
886 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
891 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
893 if(maxbytes && len > maxbytes)
896 DEBUG4("(WRITE to fd %d offset %Lu len %u), ", fhandle, foffset, len);
898 myseek(fhandle, foffset);
899 return write(fhandle, buf, len);
903 * Call rawexpwrite repeatedly until all data has been written.
904 * @return 0 on success, nonzero on failure
906 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
909 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
914 return (ret < 0 || len != 0);
918 * Read an amount of bytes at a given offset from the right file. This
919 * abstracts the read-side of the multiple files option.
921 * @param a The offset where the read should start
922 * @param buf A buffer to read into
923 * @param len The size of buf
924 * @param client The client we're serving for
925 * @return The number of bytes actually read, or -1 in case of an
928 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
933 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
935 if(maxbytes && len > maxbytes)
938 DEBUG4("(READ from fd %d offset %Lu len %u), ", fhandle, foffset, len);
940 myseek(fhandle, foffset);
941 return read(fhandle, buf, len);
945 * Call rawexpread repeatedly until all data has been read.
946 * @return 0 on success, nonzero on failure
948 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
951 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
956 return (ret < 0 || len != 0);
960 * Read an amount of bytes at a given offset from the right file. This
961 * abstracts the read-side of the copyonwrite stuff, and calls
962 * rawexpread() with the right parameters to do the actual work.
963 * @param a The offset where the read should start
964 * @param buf A buffer to read into
965 * @param len The size of buf
966 * @param client The client we're going to read for
967 * @return 0 on success, nonzero on failure
969 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
971 off_t mapcnt, mapl, maph, pagestart;
973 if (!(client->server->flags & F_COPYONWRITE))
974 return(rawexpread_fully(a, buf, len, client));
975 DEBUG3("Asked to read %d bytes at %Lu.\n", len, (unsigned long long)a);
977 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
979 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
980 pagestart=mapcnt*DIFFPAGESIZE;
982 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
983 len : (size_t)DIFFPAGESIZE-offset;
984 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
985 DEBUG3("Page %Lu is at %lu\n", (unsigned long long)mapcnt,
986 (unsigned long)(client->difmap[mapcnt]));
987 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
988 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
989 } else { /* the block is not there */
990 DEBUG2("Page %Lu is not here, we read the original one\n",
991 (unsigned long long)mapcnt);
992 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
994 len-=rdlen; a+=rdlen; buf+=rdlen;
1000 * Write an amount of bytes at a given offset to the right file. This
1001 * abstracts the write-side of the copyonwrite option, and calls
1002 * rawexpwrite() with the right parameters to do the actual work.
1004 * @param a The offset where the write should start
1005 * @param buf The buffer to write from
1006 * @param len The length of buf
1007 * @param client The client we're going to write for.
1008 * @return 0 on success, nonzero on failure
1010 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1011 char pagebuf[DIFFPAGESIZE];
1012 off_t mapcnt,mapl,maph;
1017 if (!(client->server->flags & F_COPYONWRITE))
1018 return(rawexpwrite_fully(a, buf, len, client));
1019 DEBUG3("Asked to write %d bytes at %Lu.\n", len, (unsigned long long)a);
1021 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1023 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1024 pagestart=mapcnt*DIFFPAGESIZE ;
1025 offset=a-pagestart ;
1026 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1027 len : (size_t)DIFFPAGESIZE-offset;
1029 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1030 DEBUG3("Page %Lu is at %lu\n", (unsigned long long)mapcnt,
1031 (unsigned long)(client->difmap[mapcnt])) ;
1032 myseek(client->difffile,
1033 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1034 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1035 } else { /* the block is not there */
1036 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1037 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1038 DEBUG3("Page %Lu is not here, we put it at %lu\n",
1039 (unsigned long long)mapcnt,
1040 (unsigned long)(client->difmap[mapcnt]));
1041 rdlen=DIFFPAGESIZE ;
1042 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1044 memcpy(pagebuf+offset,buf,wrlen) ;
1045 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1049 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1055 * Do the initial negotiation.
1057 * @param client The client we're negotiating with.
1059 void negotiate(CLIENT *client) {
1062 u32 flags = NBD_FLAG_HAS_FLAGS;
1064 memset(zeros, '\0', sizeof(zeros));
1065 if (write(client->net, INIT_PASSWD, 8) < 0)
1066 err("Negotiation failed: %m");
1067 cliserv_magic = htonll(cliserv_magic);
1068 if (write(client->net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
1069 err("Negotiation failed: %m");
1070 size_host = htonll((u64)(client->exportsize));
1071 if (write(client->net, &size_host, 8) < 0)
1072 err("Negotiation failed: %m");
1073 if (client->server->flags & F_READONLY)
1074 flags |= NBD_FLAG_READ_ONLY;
1075 flags = htonl(flags);
1076 if (write(client->net, &flags, 4) < 0)
1077 err("Negotiation failed: %m");
1078 if (write(client->net, zeros, 124) < 0)
1079 err("Negotiation failed: %m");
1082 /** sending macro. */
1083 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1085 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1087 * Serve a file to a single client.
1089 * @todo This beast needs to be split up in many tiny little manageable
1090 * pieces. Preferably with a chainsaw.
1092 * @param client The client we're going to serve to.
1093 * @return when the client disconnects
1095 int mainloop(CLIENT *client) {
1096 struct nbd_request request;
1097 struct nbd_reply reply;
1098 gboolean go_on=TRUE;
1103 DEBUG("Entering request loop!\n");
1104 reply.magic = htonl(NBD_REPLY_MAGIC);
1113 if (client->server->timeout)
1114 alarm(client->server->timeout);
1115 readit(client->net, &request, sizeof(request));
1116 request.from = ntohll(request.from);
1117 request.type = ntohl(request.type);
1119 if (request.type==NBD_CMD_DISC) {
1120 msg2(LOG_INFO, "Disconnect request received.");
1121 if (client->server->flags & F_COPYONWRITE) {
1122 if (client->difmap) g_free(client->difmap) ;
1123 close(client->difffile);
1124 unlink(client->difffilename);
1125 free(client->difffilename);
1131 len = ntohl(request.len);
1133 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1134 err("Not enough magic.");
1135 if (len > BUFSIZE + sizeof(struct nbd_reply))
1136 err("Request too big!");
1138 printf("%s from %Lu (%Lu) len %d, ", request.type ? "WRITE" :
1139 "READ", (unsigned long long)request.from,
1140 (unsigned long long)request.from / 512, len);
1142 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1143 if ((request.from + len) > (OFFT_MAX)) {
1144 DEBUG("[Number too large!]");
1145 ERROR(client, reply, EINVAL);
1149 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1151 ERROR(client, reply, EINVAL);
1155 if (request.type==NBD_CMD_WRITE) {
1156 DEBUG("wr: net->buf, ");
1157 readit(client->net, buf, len);
1158 DEBUG("buf->exp, ");
1159 if ((client->server->flags & F_READONLY) ||
1160 (client->server->flags & F_AUTOREADONLY)) {
1161 DEBUG("[WRITE to READONLY!]");
1162 ERROR(client, reply, EPERM);
1165 if (expwrite(request.from, buf, len, client)) {
1166 DEBUG("Write failed: %m" );
1167 ERROR(client, reply, errno);
1170 SEND(client->net, reply);
1176 DEBUG("exp->buf, ");
1177 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1178 DEBUG("Read failed: %m");
1179 ERROR(client, reply, errno);
1183 DEBUG("buf->net, ");
1184 memcpy(buf, &reply, sizeof(struct nbd_reply));
1185 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1192 * Set up client export array, which is an array of FILE_INFO.
1193 * Also, split a single exportfile into multiple ones, if that was asked.
1194 * @param client information on the client which we want to setup export for
1196 void setupexport(CLIENT* client) {
1198 off_t laststartoff = 0, lastsize = 0;
1199 int multifile = (client->server->flags & F_MULTIFILE);
1201 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1203 /* If multi-file, open as many files as we can.
1204 * If not, open exactly one file.
1205 * Calculate file sizes as we go to get total size. */
1209 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1212 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1214 tmpname=g_strdup(client->exportname);
1216 DEBUG2( "Opening %s\n", tmpname );
1217 fi.fhandle = open(tmpname, mode);
1218 if(fi.fhandle == -1 && mode == O_RDWR) {
1219 /* Try again because maybe media was read-only */
1220 fi.fhandle = open(tmpname, O_RDONLY);
1221 if(fi.fhandle != -1) {
1222 /* Opening the base file in copyonwrite mode is
1224 if(!(client->server->flags & F_COPYONWRITE)) {
1225 client->server->flags |= F_AUTOREADONLY;
1226 client->server->flags |= F_READONLY;
1230 if(fi.fhandle == -1) {
1231 if(multifile && i>0)
1233 err("Could not open exported file: %m");
1235 fi.startoff = laststartoff + lastsize;
1236 g_array_append_val(client->export, fi);
1239 /* Starting offset and size of this file will be used to
1240 * calculate starting offset of next file */
1241 laststartoff = fi.startoff;
1242 lastsize = size_autodetect(fi.fhandle);
1248 /* Set export size to total calculated size */
1249 client->exportsize = laststartoff + lastsize;
1251 /* Export size may be overridden */
1252 if(client->server->expected_size) {
1253 /* desired size must be <= total calculated size */
1254 if(client->server->expected_size > client->exportsize) {
1255 err("Size of exported file is too big\n");
1258 client->exportsize = client->server->expected_size;
1261 msg3(LOG_INFO, "Size of exported file/device is %Lu", (unsigned long long)client->exportsize);
1263 msg3(LOG_INFO, "Total number of files: %d", i);
1267 int copyonwrite_prepare(CLIENT* client) {
1269 if ((client->difffilename = malloc(1024))==NULL)
1270 err("Failed to allocate string for diff file name");
1271 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1273 client->difffilename[1023]='\0';
1274 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1275 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1276 if (client->difffile<0) err("Could not create diff file (%m)") ;
1277 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1278 err("Could not allocate memory") ;
1279 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1285 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1288 * @param command the command to be ran. Read from the config file
1289 * @param file the file name we're about to export
1291 int do_run(gchar* command, gchar* file) {
1295 if(command && *command) {
1296 cmd = g_strdup_printf(command, file);
1304 * Serve a connection.
1306 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1307 * follow the road map.
1309 * @param client a connected client
1311 void serveconnection(CLIENT *client) {
1312 if(do_run(client->server->prerun, client->exportname)) {
1315 setupexport(client);
1317 if (client->server->flags & F_COPYONWRITE) {
1318 copyonwrite_prepare(client);
1321 setmysockopt(client->net);
1324 do_run(client->server->postrun, client->exportname);
1328 * Find the name of the file we have to serve. This will use g_strdup_printf
1329 * to put the IP address of the client inside a filename containing
1330 * "%s" (in the form as specified by the "virtstyle" option). That name
1331 * is then written to client->exportname.
1333 * @param net A socket connected to an nbd client
1334 * @param client information about the client. The IP address in human-readable
1335 * format will be written to a new char* buffer, the address of which will be
1336 * stored in client->clientname.
1338 void set_peername(int net, CLIENT *client) {
1339 struct sockaddr_in addrin;
1340 struct sockaddr_in netaddr;
1341 size_t addrinlen = sizeof( addrin );
1347 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1348 err("getsockname failed: %m");
1349 peername = g_strdup(inet_ntoa(addrin.sin_addr));
1350 switch(client->server->virtstyle) {
1352 client->exportname=g_strdup(client->server->exportname);
1355 for(i=0;i<strlen(peername);i++) {
1356 if(peername[i]=='.') {
1361 client->exportname=g_strdup_printf(client->server->exportname, peername);
1364 memcpy(&netaddr, &addrin, addrinlen);
1365 netaddr.sin_addr.s_addr>>=32-(client->server->cidrlen);
1366 netaddr.sin_addr.s_addr<<=32-(client->server->cidrlen);
1367 netname = inet_ntoa(netaddr.sin_addr);
1368 tmp=g_strdup_printf("%s/%s", netname, peername);
1369 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1373 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1374 peername, client->exportname);
1375 client->clientname=g_strdup(peername);
1381 * @param data a pointer to pid_t which should be freed
1383 void destroy_pid_t(gpointer data) {
1388 * Loop through the available servers, and serve them. Never returns.
1390 int serveloop(GArray* servers) {
1391 struct sockaddr_in addrin;
1392 socklen_t addrinlen=sizeof(addrin);
1401 * Set up the master fd_set. The set of descriptors we need
1402 * to select() for never changes anyway and it buys us a *lot*
1403 * of time to only build this once. However, if we ever choose
1404 * to not fork() for clients anymore, we may have to revisit
1409 for(i=0;i<servers->len;i++) {
1410 sock=(g_array_index(servers, SERVER, i)).socket;
1411 FD_SET(sock, &mset);
1412 max=sock>max?sock:max;
1419 memcpy(&rset, &mset, sizeof(fd_set));
1420 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1422 for(i=0;i<servers->len;i++) {
1423 serve=&(g_array_index(servers, SERVER, i));
1424 if(FD_ISSET(serve->socket, &rset)) {
1425 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1428 client = g_malloc(sizeof(CLIENT));
1429 client->server=serve;
1430 client->exportsize=OFFT_MAX;
1432 set_peername(net, client);
1433 if (!authorized_client(client)) {
1434 msg2(LOG_INFO,"Unauthorized client") ;
1438 msg2(LOG_INFO,"Authorized client") ;
1439 pid=g_malloc(sizeof(pid_t));
1441 if ((*pid=fork())<0) {
1442 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1446 if (*pid>0) { /* parent */
1448 g_hash_table_insert(children, pid, pid);
1452 g_hash_table_destroy(children);
1453 for(i=0;i<servers->len;i++) {
1454 serve=&g_array_index(servers, SERVER, i);
1455 close(serve->socket);
1457 /* FALSE does not free the
1458 actual data. This is required,
1459 because the client has a
1460 direct reference into that
1461 data, and otherwise we get a
1463 g_array_free(servers, FALSE);
1465 msg2(LOG_INFO,"Starting to serve");
1466 serveconnection(client);
1475 * Connect a server's socket.
1477 * @param serve the server we want to connect.
1479 void setup_serve(SERVER *serve) {
1480 struct sockaddr_in addrin;
1481 struct sigaction sa;
1482 int addrinlen = sizeof(addrin);
1493 if ((serve->flags) && F_SDP) {
1497 if ((serve->socket = socket(af, SOCK_STREAM, IPPROTO_TCP)) < 0)
1500 /* lose the pesky "Address already in use" error message */
1501 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1502 err("setsockopt SO_REUSEADDR");
1504 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1505 err("setsockopt SO_KEEPALIVE");
1508 /* make the listening socket non-blocking */
1509 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1510 err("fcntl F_GETFL");
1512 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1513 err("fcntl F_SETFL O_NONBLOCK");
1516 DEBUG("Waiting for connections... bind, ");
1517 addrin.sin_family = AF_INET;
1519 if(serve->flags & F_SDP) {
1520 addrin.sin_family = AF_INET_SDP;
1523 addrin.sin_port = htons(serve->port);
1524 if(!inet_aton(serve->listenaddr, &(addrin.sin_addr)))
1525 err("could not parse listen address");
1526 if (bind(serve->socket, (struct sockaddr *) &addrin, addrinlen) < 0)
1529 if (listen(serve->socket, 1) < 0)
1531 sa.sa_handler = sigchld_handler;
1532 sigemptyset(&sa.sa_mask);
1533 sa.sa_flags = SA_RESTART;
1534 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1535 err("sigaction: %m");
1536 sa.sa_handler = sigterm_handler;
1537 sigemptyset(&sa.sa_mask);
1538 sa.sa_flags = SA_RESTART;
1539 if(sigaction(SIGTERM, &sa, NULL) == -1)
1540 err("sigaction: %m");
1544 * Connect our servers.
1546 void setup_servers(GArray* servers) {
1549 for(i=0;i<servers->len;i++) {
1550 setup_serve(&(g_array_index(servers, SERVER, i)));
1552 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1556 * Go daemon (unless we specified at compile time that we didn't want this)
1557 * @param serve the first server of our configuration. If its port is zero,
1558 * then do not daemonize, because we're doing inetd then. This parameter
1559 * is only used to create a PID file of the form
1560 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1562 #if !defined(NODAEMON) && !defined(NOFORK)
1563 void daemonize(SERVER* serve) {
1566 if(serve && !(serve->port)) {
1572 if(!*pidftemplate) {
1574 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1576 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1579 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1580 pidf=fopen(pidfname, "w");
1582 fprintf(pidf,"%d\n", (int)getpid());
1586 fprintf(stderr, "Not fatal; continuing");
1590 #define daemonize(serve)
1591 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1594 * Everything beyond this point (in the file) is run in non-daemon mode.
1595 * The stuff above daemonize() isn't.
1598 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1600 void serve_err(SERVER* serve, const char* msg) {
1601 g_message("Export of %s on port %d failed:", serve->exportname,
1607 * Set up user-ID and/or group-ID
1609 void dousers(void) {
1613 gr=getgrnam(rungroup);
1615 g_message("Invalid group name: %s", rungroup);
1618 if(setgid(gr->gr_gid)<0) {
1619 g_message("Could not set GID: %s", strerror(errno));
1624 pw=getpwnam(runuser);
1626 g_message("Invalid user name: %s", runuser);
1629 if(setuid(pw->pw_uid)<0) {
1630 g_message("Could not set UID: %s", strerror(errno));
1637 * Main entry point...
1639 int main(int argc, char *argv[]) {
1644 if (sizeof( struct nbd_request )!=28) {
1645 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1646 exit(EXIT_FAILURE) ;
1649 memset(pidftemplate, '\0', 256);
1652 config_file_pos = g_strdup(CFILE);
1653 serve=cmdline(argc, argv);
1654 servers = parse_cfile(config_file_pos, &err);
1655 if(!servers || !servers->len) {
1656 g_warning("Could not parse config file: %s",
1657 err ? err->message : "Unknown error");
1660 g_array_append_val(servers, *serve);
1662 if (!(serve->port)) {
1665 /* You really should define ISSERVER if you're going to use
1666 * inetd mode, but if you don't, closing stdout and stderr
1667 * (which inetd had connected to the client socket) will let it
1671 open("/dev/null", O_WRONLY);
1672 open("/dev/null", O_WRONLY);
1674 client=g_malloc(sizeof(CLIENT));
1675 client->server=serve;
1677 client->exportsize=OFFT_MAX;
1678 set_peername(0,client);
1679 serveconnection(client);
1683 if((!serve) && (!servers||!servers->len)) {
1684 g_message("Nothing to do! Bye!");
1688 setup_servers(servers);