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 int socket; /**< The socket of this server. */
180 VIRT_STYLE virtstyle;/**< The style of virtualization, if any */
181 uint8_t cidrlen; /**< The length of the mask when we use
182 CIDR-style virtualization */
183 gchar* prerun; /**< command to be ran after connecting a client,
184 but before starting to serve */
185 gchar* postrun; /**< command that will be ran after the client
190 * Variables associated with a client socket.
193 int fhandle; /**< file descriptor */
194 off_t startoff; /**< starting offset of this file */
198 off_t exportsize; /**< size of the file we're exporting */
199 char *clientname; /**< peer */
200 char *exportname; /**< (processed) filename of the file we're exporting */
201 GArray *export; /**< array of FILE_INFO of exported files;
202 array size is always 1 unless we're
203 doing the multiple file option */
204 int net; /**< The actual client socket */
205 SERVER *server; /**< The server this client is getting data from */
206 char* difffilename; /**< filename of the copy-on-write file, if any */
207 int difffile; /**< filedescriptor of copyonwrite file. @todo
208 shouldn't this be an array too? (cfr export) Or
209 make -m and -c mutually exclusive */
210 u32 difffilelen; /**< number of pages in difffile */
211 u32 *difmap; /**< see comment on the global difmap for this one */
215 * Type of configuration file values
218 PARAM_INT, /**< This parameter is an integer */
219 PARAM_STRING, /**< This parameter is a string */
220 PARAM_BOOL, /**< This parameter is a boolean */
224 * Configuration file values
227 gchar *paramname; /**< Name of the parameter, as it appears in
229 gboolean required; /**< Whether this is a required (as opposed to
230 optional) parameter */
231 PARAM_TYPE ptype; /**< Type of the parameter. */
232 gpointer target; /**< Pointer to where the data of this
233 parameter should be written. If ptype is
234 PARAM_BOOL, the data is or'ed rather than
236 gint flagval; /**< Flag mask for this parameter in case ptype
241 * Check whether a client is allowed to connect. Works with an authorization
242 * file which contains one line per machine, no wildcards.
244 * @param opts The client who's trying to connect.
245 * @return 0 - authorization refused, 1 - OK
247 int authorized_client(CLIENT *opts) {
248 const char *ERRMSG="Invalid entry '%s' in authfile '%s', so, refusing all connections.";
253 struct in_addr client;
254 struct in_addr cltemp;
257 if ((f=fopen(opts->server->authname,"r"))==NULL) {
258 msg4(LOG_INFO,"Can't open authorization file %s (%s).",
259 opts->server->authname,strerror(errno)) ;
263 inet_aton(opts->clientname, &client);
264 while (fgets(line,LINELEN,f)!=NULL) {
265 if((tmp=index(line, '/'))) {
266 if(strlen(line)<=tmp-line) {
267 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
271 if(inet_aton(line,&addr)) {
272 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
275 len=strtol(tmp, NULL, 0);
276 addr.s_addr>>=32-len;
277 addr.s_addr<<=32-len;
278 memcpy(&cltemp,&client,sizeof(client));
279 cltemp.s_addr>>=32-len;
280 cltemp.s_addr<<=32-len;
281 if(addr.s_addr == cltemp.s_addr) {
285 if (strncmp(line,opts->clientname,strlen(opts->clientname))==0) {
295 * Read data from a file descriptor into a buffer
297 * @param f a file descriptor
298 * @param buf a buffer
299 * @param len the number of bytes to be read
301 inline void readit(int f, void *buf, size_t len) {
305 if ((res = read(f, buf, len)) <= 0)
306 err("Read failed: %m");
313 * Write data from a buffer into a filedescriptor
315 * @param f a file descriptor
316 * @param buf a buffer containing data
317 * @param len the number of bytes to be written
319 inline void writeit(int f, void *buf, size_t len) {
323 if ((res = write(f, buf, len)) <= 0)
324 err("Send failed: %m");
331 * Print out a message about how to use nbd-server. Split out to a separate
332 * function so that we can call it from multiple places
335 printf("This is nbd-server version " VERSION "\n");
336 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"
337 "\t-r|--read-only\t\tread only\n"
338 "\t-m|--multi-file\t\tmultiple file\n"
339 "\t-c|--copy-on-write\tcopy on write\n"
340 "\t-C|--config-file\tspecify an alternate configuration file\n"
341 "\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
342 "\t-a|--idle-time\t\tmaximum idle seconds; server terminates when\n\t\t\t\tidle time exceeded\n"
343 "\t-p|--pid-file\t\tspecify a filename to write our PID to\n"
344 "\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"
345 "\tif port is set to 0, stdin is used (for running from inetd)\n"
346 "\tif file_to_export contains '%%s', it is substituted with the IP\n"
347 "\t\taddress of the machine trying to connect\n"
348 "\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");
349 printf("Using configuration file %s\n", CFILE);
352 /* Dumps a config file section of the given SERVER*, and exits. */
353 void dump_section(SERVER* serve, gchar* section_header) {
354 printf("[%s]\n", section_header);
355 printf("\texportname = %s\n", serve->exportname);
356 printf("\tlistenaddr = %s\n", serve->listenaddr);
357 printf("\tport = %d\n", serve->port);
358 if(serve->flags & F_READONLY) {
359 printf("\treadonly = true\n");
361 if(serve->flags & F_MULTIFILE) {
362 printf("\tmultifile = true\n");
364 if(serve->flags & F_COPYONWRITE) {
365 printf("\tcopyonwrite = true\n");
367 if(serve->expected_size) {
368 printf("\tfilesize = %lld\n", (long long int)serve->expected_size);
370 if(serve->authname) {
371 printf("\tauthfile = %s\n", serve->authname);
377 * Parse the command line.
379 * @param argc the argc argument to main()
380 * @param argv the argv argument to main()
382 SERVER* cmdline(int argc, char *argv[]) {
386 struct option long_options[] = {
387 {"read-only", no_argument, NULL, 'r'},
388 {"multi-file", no_argument, NULL, 'm'},
389 {"copy-on-write", no_argument, NULL, 'c'},
390 {"authorize-file", required_argument, NULL, 'l'},
391 {"idle-time", required_argument, NULL, 'a'},
392 {"config-file", required_argument, NULL, 'C'},
393 {"pid-file", required_argument, NULL, 'p'},
394 {"output-config", required_argument, NULL, 'o'},
401 gboolean do_output=FALSE;
402 gchar* section_header="";
408 serve=g_new0(SERVER, 1);
409 serve->authname = g_strdup(default_authname);
410 serve->virtstyle=VIRT_IPLIT;
411 while((c=getopt_long(argc, argv, "-a:C:cl:mo:rp:", long_options, &i))>=0) {
414 /* non-option argument */
415 switch(nonspecial++) {
417 addr_port=g_strsplit(optarg, ":", 2);
419 serve->port=strtol(addr_port[1], NULL, 0);
420 serve->listenaddr=g_strdup(addr_port[0]);
422 serve->listenaddr=g_strdup("0.0.0.0");
423 serve->port=strtol(addr_port[0], NULL, 0);
425 g_strfreev(addr_port);
428 serve->exportname = g_strdup(optarg);
429 if(serve->exportname[0] != '/') {
430 fprintf(stderr, "E: The to be exported file needs to be an absolute filename!\n");
435 last=strlen(optarg)-1;
437 if (suffix == 'k' || suffix == 'K' ||
438 suffix == 'm' || suffix == 'M')
440 es = (off_t)atoll(optarg);
448 serve->expected_size = es;
453 serve->flags |= F_READONLY;
456 serve->flags |= F_MULTIFILE;
460 section_header = g_strdup(optarg);
463 strncpy(pidftemplate, optarg, 256);
466 serve->flags |=F_COPYONWRITE;
469 g_free(config_file_pos);
470 config_file_pos=g_strdup(optarg);
473 g_free(serve->authname);
474 serve->authname=g_strdup(optarg);
482 /* What's left: the port to export, the name of the to be exported
483 * file, and, optionally, the size of the file, in that order. */
490 g_critical("Need a complete configuration on the command line to output a config file section!");
493 dump_section(serve, section_header);
499 * Error codes for config file parsing
502 CFILE_NOTFOUND, /**< The configuration file is not found */
503 CFILE_MISSING_GENERIC, /**< The (required) group "generic" is missing */
504 CFILE_KEY_MISSING, /**< A (required) key is missing */
505 CFILE_VALUE_INVALID, /**< A value is syntactically invalid */
506 CFILE_VALUE_UNSUPPORTED,/**< A value is not supported in this build */
507 CFILE_PROGERR, /**< Programmer error */
508 CFILE_NO_EXPORTS /**< A config file was specified that does not
509 define any exports */
513 * Remove a SERVER from memory. Used from the hash table
515 void remove_server(gpointer s) {
519 g_free(server->exportname);
521 g_free(server->authname);
526 * Parse the config file.
528 * @param f the name of the config file
529 * @param e a GError. @see CFILE_ERRORS for what error values this function can
531 * @return a Array of SERVER* pointers, If the config file is empty or does not
532 * exist, returns an empty GHashTable; if the config file contains an
533 * error, returns NULL, and e is set appropriately
535 GArray* parse_cfile(gchar* f, GError** e) {
536 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
537 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
539 gchar *virtstyle=NULL;
541 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
542 { "port", TRUE, PARAM_INT, NULL, 0 },
543 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
544 { "filesize", FALSE, PARAM_INT, NULL, 0 },
545 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
546 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
547 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
548 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
549 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
550 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
551 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
552 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
553 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
555 const int lp_size=sizeof(lp)/sizeof(PARAM);
557 { "user", FALSE, PARAM_STRING, &runuser, 0 },
558 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
561 int p_size=sizeof(gp)/sizeof(PARAM);
564 const char *err_msg=NULL;
573 errdomain = g_quark_from_string("parse_cfile");
574 cfile = g_key_file_new();
575 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
576 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
577 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
578 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file.");
579 g_key_file_free(cfile);
582 startgroup = g_key_file_get_start_group(cfile);
583 if(!startgroup || strcmp(startgroup, "generic")) {
584 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
585 g_key_file_free(cfile);
588 groups = g_key_file_get_groups(cfile, NULL);
589 for(i=0;groups[i];i++) {
590 memset(&s, '\0', sizeof(SERVER));
591 lp[0].target=&(s.exportname);
592 lp[1].target=&(s.port);
593 lp[2].target=&(s.authname);
594 lp[3].target=&(s.expected_size);
595 lp[4].target=&(virtstyle);
596 lp[5].target=&(s.prerun);
597 lp[6].target=&(s.postrun);
598 lp[7].target=lp[8].target=lp[9].target=
599 lp[10].target=lp[11].target=&(s.flags);
600 lp[12].target=&(s.listenaddr);
602 /* After the [generic] group, start parsing exports */
607 for(j=0;j<p_size;j++) {
608 g_assert(p[j].target != NULL);
609 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
612 *((gint*)p[j].target) =
613 g_key_file_get_integer(cfile,
619 *((gchar**)p[j].target) =
620 g_key_file_get_string(cfile,
626 value = g_key_file_get_boolean(cfile,
628 p[j].paramname, &err);
631 *((gint*)p[j].target) |= p[j].flagval;
633 *((gint*)p[j].target) &= ~(p[j].flagval);
639 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
641 /* Ignore not-found error for optional values */
645 err_msg = MISSING_REQUIRED_ERROR;
648 err_msg = DEFAULT_ERROR;
650 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
651 g_array_free(retval, TRUE);
653 g_key_file_free(cfile);
658 if(!strncmp(virtstyle, "none", 4)) {
659 s.virtstyle=VIRT_NONE;
660 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
661 s.virtstyle=VIRT_IPLIT;
662 } else if(!strncmp(virtstyle, "iphash", 6)) {
663 s.virtstyle=VIRT_IPHASH;
664 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
665 s.virtstyle=VIRT_CIDR;
666 if(strlen(virtstyle)<10) {
667 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
668 g_array_free(retval, TRUE);
669 g_key_file_free(cfile);
672 s.cidrlen=strtol(virtstyle+8, NULL, 0);
674 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
675 g_array_free(retval, TRUE);
676 g_key_file_free(cfile);
680 s.virtstyle=VIRT_IPLIT;
682 /* Don't need to free this, it's not our string */
684 /* Don't append values for the [generic] group */
687 s.listenaddr = g_strdup("0.0.0.0");
689 g_array_append_val(retval, s);
692 if(s.flags & F_SDP) {
693 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
694 g_array_free(retval, TRUE);
695 g_key_file_free(cfile);
701 g_set_error(e, errdomain, CFILE_NO_EXPORTS, "The config file does not specify any exports");
703 g_key_file_free(cfile);
708 * Signal handler for SIGCHLD
709 * @param s the signal we're handling (must be SIGCHLD, or something
712 void sigchld_handler(int s) {
717 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
718 if(WIFEXITED(status)) {
719 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
721 i=g_hash_table_lookup(children, &pid);
723 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
725 DEBUG2("Removing %d from the list of children", pid);
726 g_hash_table_remove(children, &pid);
732 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
735 * @param value the value corresponding to the above key
736 * @param user_data a pointer which we always set to 1, so that we know what
739 void killchild(gpointer key, gpointer value, gpointer user_data) {
741 int *parent=user_data;
748 * Handle SIGTERM and dispatch it to our children
749 * @param s the signal we're handling (must be SIGTERM, or something
750 * is severely wrong).
752 void sigterm_handler(int s) {
755 g_hash_table_foreach(children, killchild, &parent);
765 * Detect the size of a file.
767 * @param fhandle An open filedescriptor
768 * @return the size of the file, or OFFT_MAX if detection was
771 off_t size_autodetect(int fhandle) {
773 unsigned long sectors;
774 struct stat stat_buf;
777 #ifdef HAVE_SYS_MOUNT_H
778 #ifdef HAVE_SYS_IOCTL_H
780 DEBUG("looking for export size with ioctl BLKGETSIZE\n");
781 if (!ioctl(fhandle, BLKGETSIZE, §ors) && sectors) {
782 es = (off_t)sectors * (off_t)512;
785 #endif /* BLKGETSIZE */
786 #endif /* HAVE_SYS_IOCTL_H */
787 #endif /* HAVE_SYS_MOUNT_H */
789 DEBUG("looking for fhandle size with fstat\n");
790 stat_buf.st_size = 0;
791 error = fstat(fhandle, &stat_buf);
793 if(stat_buf.st_size > 0)
794 return (off_t)stat_buf.st_size;
796 err("fstat failed: %m");
799 DEBUG("looking for fhandle size with lseek SEEK_END\n");
800 es = lseek(fhandle, (off_t)0, SEEK_END);
801 if (es > ((off_t)0)) {
804 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
807 err("Could not find size of exported block device: %m");
812 * Get the file handle and offset, given an export offset.
814 * @param export An array of export files
815 * @param a The offset to get corresponding file/offset for
816 * @param fhandle [out] File descriptor
817 * @param foffset [out] Offset into fhandle
818 * @param maxbytes [out] Tells how many bytes can be read/written
819 * from fhandle starting at foffset (0 if there is no limit)
820 * @return 0 on success, -1 on failure
822 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
823 /* Negative offset not allowed */
827 /* Binary search for last file with starting offset <= a */
830 int end = export->len - 1;
831 while( start <= end ) {
832 int mid = (start + end) / 2;
833 fi = g_array_index(export, FILE_INFO, mid);
834 if( fi.startoff < a ) {
836 } else if( fi.startoff > a ) {
844 /* end should never go negative, since first startoff is 0 and a >= 0 */
847 fi = g_array_index(export, FILE_INFO, end);
848 *fhandle = fi.fhandle;
849 *foffset = a - fi.startoff;
851 if( end+1 < export->len ) {
852 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
853 *maxbytes = fi_next.startoff - a;
860 * seek to a position in a file, with error handling.
861 * @param handle a filedescriptor
862 * @param a position to seek to
863 * @todo get rid of this; lastpoint is a global variable right now, but it
864 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
867 void myseek(int handle,off_t a) {
868 if (lseek(handle, a, SEEK_SET) < 0) {
869 err("Can not seek locally!\n");
874 * Write an amount of bytes at a given offset to the right file. This
875 * abstracts the write-side of the multiple file option.
877 * @param a The offset where the write should start
878 * @param buf The buffer to write from
879 * @param len The length of buf
880 * @param client The client we're serving for
881 * @return The number of bytes actually written, or -1 in case of an error
883 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
888 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
890 if(maxbytes && len > maxbytes)
893 DEBUG4("(WRITE to fd %d offset %llu len %u), ", fhandle, foffset, len);
895 myseek(fhandle, foffset);
896 return write(fhandle, buf, len);
900 * Call rawexpwrite repeatedly until all data has been written.
901 * @return 0 on success, nonzero on failure
903 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
906 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
911 return (ret < 0 || len != 0);
915 * Read an amount of bytes at a given offset from the right file. This
916 * abstracts the read-side of the multiple files option.
918 * @param a The offset where the read should start
919 * @param buf A buffer to read into
920 * @param len The size of buf
921 * @param client The client we're serving for
922 * @return The number of bytes actually read, or -1 in case of an
925 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
930 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
932 if(maxbytes && len > maxbytes)
935 DEBUG4("(READ from fd %d offset %llu len %u), ", fhandle, foffset, len);
937 myseek(fhandle, foffset);
938 return read(fhandle, buf, len);
942 * Call rawexpread repeatedly until all data has been read.
943 * @return 0 on success, nonzero on failure
945 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
948 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
953 return (ret < 0 || len != 0);
957 * Read an amount of bytes at a given offset from the right file. This
958 * abstracts the read-side of the copyonwrite stuff, and calls
959 * rawexpread() with the right parameters to do the actual work.
960 * @param a The offset where the read should start
961 * @param buf A buffer to read into
962 * @param len The size of buf
963 * @param client The client we're going to read for
964 * @return 0 on success, nonzero on failure
966 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
968 off_t mapcnt, mapl, maph, pagestart;
970 if (!(client->server->flags & F_COPYONWRITE))
971 return(rawexpread_fully(a, buf, len, client));
972 DEBUG3("Asked to read %d bytes at %llu.\n", len, (unsigned long long)a);
974 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
976 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
977 pagestart=mapcnt*DIFFPAGESIZE;
979 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
980 len : (size_t)DIFFPAGESIZE-offset;
981 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
982 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
983 (unsigned long)(client->difmap[mapcnt]));
984 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
985 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
986 } else { /* the block is not there */
987 DEBUG2("Page %llu is not here, we read the original one\n",
988 (unsigned long long)mapcnt);
989 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
991 len-=rdlen; a+=rdlen; buf+=rdlen;
997 * Write an amount of bytes at a given offset to the right file. This
998 * abstracts the write-side of the copyonwrite option, and calls
999 * rawexpwrite() with the right parameters to do the actual work.
1001 * @param a The offset where the write should start
1002 * @param buf The buffer to write from
1003 * @param len The length of buf
1004 * @param client The client we're going to write for.
1005 * @return 0 on success, nonzero on failure
1007 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1008 char pagebuf[DIFFPAGESIZE];
1009 off_t mapcnt,mapl,maph;
1014 if (!(client->server->flags & F_COPYONWRITE))
1015 return(rawexpwrite_fully(a, buf, len, client));
1016 DEBUG3("Asked to write %d bytes at %llu.\n", len, (unsigned long long)a);
1018 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1020 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1021 pagestart=mapcnt*DIFFPAGESIZE ;
1022 offset=a-pagestart ;
1023 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1024 len : (size_t)DIFFPAGESIZE-offset;
1026 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1027 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1028 (unsigned long)(client->difmap[mapcnt])) ;
1029 myseek(client->difffile,
1030 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1031 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1032 } else { /* the block is not there */
1033 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1034 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1035 DEBUG3("Page %llu is not here, we put it at %lu\n",
1036 (unsigned long long)mapcnt,
1037 (unsigned long)(client->difmap[mapcnt]));
1038 rdlen=DIFFPAGESIZE ;
1039 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1041 memcpy(pagebuf+offset,buf,wrlen) ;
1042 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1046 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1052 * Do the initial negotiation.
1054 * @param client The client we're negotiating with.
1056 void negotiate(CLIENT *client) {
1059 u32 flags = NBD_FLAG_HAS_FLAGS;
1061 memset(zeros, '\0', sizeof(zeros));
1062 if (write(client->net, INIT_PASSWD, 8) < 0)
1063 err("Negotiation failed: %m");
1064 cliserv_magic = htonll(cliserv_magic);
1065 if (write(client->net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
1066 err("Negotiation failed: %m");
1067 size_host = htonll((u64)(client->exportsize));
1068 if (write(client->net, &size_host, 8) < 0)
1069 err("Negotiation failed: %m");
1070 if (client->server->flags & F_READONLY)
1071 flags |= NBD_FLAG_READ_ONLY;
1072 flags = htonl(flags);
1073 if (write(client->net, &flags, 4) < 0)
1074 err("Negotiation failed: %m");
1075 if (write(client->net, zeros, 124) < 0)
1076 err("Negotiation failed: %m");
1079 /** sending macro. */
1080 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1082 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1084 * Serve a file to a single client.
1086 * @todo This beast needs to be split up in many tiny little manageable
1087 * pieces. Preferably with a chainsaw.
1089 * @param client The client we're going to serve to.
1090 * @return when the client disconnects
1092 int mainloop(CLIENT *client) {
1093 struct nbd_request request;
1094 struct nbd_reply reply;
1095 gboolean go_on=TRUE;
1100 DEBUG("Entering request loop!\n");
1101 reply.magic = htonl(NBD_REPLY_MAGIC);
1110 readit(client->net, &request, sizeof(request));
1111 request.from = ntohll(request.from);
1112 request.type = ntohl(request.type);
1114 if (request.type==NBD_CMD_DISC) {
1115 msg2(LOG_INFO, "Disconnect request received.");
1116 if (client->server->flags & F_COPYONWRITE) {
1117 if (client->difmap) g_free(client->difmap) ;
1118 close(client->difffile);
1119 unlink(client->difffilename);
1120 free(client->difffilename);
1126 len = ntohl(request.len);
1128 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1129 err("Not enough magic.");
1130 if (len > BUFSIZE + sizeof(struct nbd_reply))
1131 err("Request too big!");
1133 printf("%s from %llu (%llu) len %d, ", request.type ? "WRITE" :
1134 "READ", (unsigned long long)request.from,
1135 (unsigned long long)request.from / 512, len);
1137 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1138 if ((request.from + len) > (OFFT_MAX)) {
1139 DEBUG("[Number too large!]");
1140 ERROR(client, reply, EINVAL);
1144 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1146 ERROR(client, reply, EINVAL);
1150 if (request.type==NBD_CMD_WRITE) {
1151 DEBUG("wr: net->buf, ");
1152 readit(client->net, buf, len);
1153 DEBUG("buf->exp, ");
1154 if ((client->server->flags & F_READONLY) ||
1155 (client->server->flags & F_AUTOREADONLY)) {
1156 DEBUG("[WRITE to READONLY!]");
1157 ERROR(client, reply, EPERM);
1160 if (expwrite(request.from, buf, len, client)) {
1161 DEBUG("Write failed: %m" );
1162 ERROR(client, reply, errno);
1165 SEND(client->net, reply);
1171 DEBUG("exp->buf, ");
1172 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1173 DEBUG("Read failed: %m");
1174 ERROR(client, reply, errno);
1178 DEBUG("buf->net, ");
1179 memcpy(buf, &reply, sizeof(struct nbd_reply));
1180 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1187 * Set up client export array, which is an array of FILE_INFO.
1188 * Also, split a single exportfile into multiple ones, if that was asked.
1189 * @param client information on the client which we want to setup export for
1191 void setupexport(CLIENT* client) {
1193 off_t laststartoff = 0, lastsize = 0;
1194 int multifile = (client->server->flags & F_MULTIFILE);
1196 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1198 /* If multi-file, open as many files as we can.
1199 * If not, open exactly one file.
1200 * Calculate file sizes as we go to get total size. */
1204 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1207 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1209 tmpname=g_strdup(client->exportname);
1211 DEBUG2( "Opening %s\n", tmpname );
1212 fi.fhandle = open(tmpname, mode);
1213 if(fi.fhandle == -1 && mode == O_RDWR) {
1214 /* Try again because maybe media was read-only */
1215 fi.fhandle = open(tmpname, O_RDONLY);
1216 if(fi.fhandle != -1) {
1217 /* Opening the base file in copyonwrite mode is
1219 if(!(client->server->flags & F_COPYONWRITE)) {
1220 client->server->flags |= F_AUTOREADONLY;
1221 client->server->flags |= F_READONLY;
1225 if(fi.fhandle == -1) {
1226 if(multifile && i>0)
1228 err("Could not open exported file: %m");
1230 fi.startoff = laststartoff + lastsize;
1231 g_array_append_val(client->export, fi);
1234 /* Starting offset and size of this file will be used to
1235 * calculate starting offset of next file */
1236 laststartoff = fi.startoff;
1237 lastsize = size_autodetect(fi.fhandle);
1243 /* Set export size to total calculated size */
1244 client->exportsize = laststartoff + lastsize;
1246 /* Export size may be overridden */
1247 if(client->server->expected_size) {
1248 /* desired size must be <= total calculated size */
1249 if(client->server->expected_size > client->exportsize) {
1250 err("Size of exported file is too big\n");
1253 client->exportsize = client->server->expected_size;
1256 msg3(LOG_INFO, "Size of exported file/device is %llu", (unsigned long long)client->exportsize);
1258 msg3(LOG_INFO, "Total number of files: %d", i);
1262 int copyonwrite_prepare(CLIENT* client) {
1264 if ((client->difffilename = malloc(1024))==NULL)
1265 err("Failed to allocate string for diff file name");
1266 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1268 client->difffilename[1023]='\0';
1269 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1270 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1271 if (client->difffile<0) err("Could not create diff file (%m)") ;
1272 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1273 err("Could not allocate memory") ;
1274 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1280 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1283 * @param command the command to be ran. Read from the config file
1284 * @param file the file name we're about to export
1286 int do_run(gchar* command, gchar* file) {
1290 if(command && *command) {
1291 cmd = g_strdup_printf(command, file);
1299 * Serve a connection.
1301 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1302 * follow the road map.
1304 * @param client a connected client
1306 void serveconnection(CLIENT *client) {
1307 if(do_run(client->server->prerun, client->exportname)) {
1310 setupexport(client);
1312 if (client->server->flags & F_COPYONWRITE) {
1313 copyonwrite_prepare(client);
1316 setmysockopt(client->net);
1319 do_run(client->server->postrun, client->exportname);
1323 * Find the name of the file we have to serve. This will use g_strdup_printf
1324 * to put the IP address of the client inside a filename containing
1325 * "%s" (in the form as specified by the "virtstyle" option). That name
1326 * is then written to client->exportname.
1328 * @param net A socket connected to an nbd client
1329 * @param client information about the client. The IP address in human-readable
1330 * format will be written to a new char* buffer, the address of which will be
1331 * stored in client->clientname.
1333 void set_peername(int net, CLIENT *client) {
1334 struct sockaddr_in addrin;
1335 struct sockaddr_in netaddr;
1336 size_t addrinlen = sizeof( addrin );
1342 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1343 err("getsockname failed: %m");
1344 peername = g_strdup(inet_ntoa(addrin.sin_addr));
1345 switch(client->server->virtstyle) {
1347 client->exportname=g_strdup(client->server->exportname);
1350 for(i=0;i<strlen(peername);i++) {
1351 if(peername[i]=='.') {
1356 client->exportname=g_strdup_printf(client->server->exportname, peername);
1359 memcpy(&netaddr, &addrin, addrinlen);
1360 netaddr.sin_addr.s_addr>>=32-(client->server->cidrlen);
1361 netaddr.sin_addr.s_addr<<=32-(client->server->cidrlen);
1362 netname = inet_ntoa(netaddr.sin_addr);
1363 tmp=g_strdup_printf("%s/%s", netname, peername);
1364 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1368 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1369 peername, client->exportname);
1370 client->clientname=g_strdup(peername);
1376 * @param data a pointer to pid_t which should be freed
1378 void destroy_pid_t(gpointer data) {
1383 * Loop through the available servers, and serve them. Never returns.
1385 int serveloop(GArray* servers) {
1386 struct sockaddr_in addrin;
1387 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));
1415 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1417 for(i=0;i<servers->len;i++) {
1418 serve=&(g_array_index(servers, SERVER, i));
1419 if(FD_ISSET(serve->socket, &rset)) {
1421 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1424 if((sock_flags = fcntl(net, F_GETFL, 0))==-1) {
1425 err("fcntl F_GETFL");
1427 if(fcntl(net, F_SETFL, sock_flags &~O_NONBLOCK)==-1) {
1428 err("fcntl F_SETFL ~O_NONBLOCK");
1430 client = g_malloc(sizeof(CLIENT));
1431 client->server=serve;
1432 client->exportsize=OFFT_MAX;
1434 set_peername(net, client);
1435 if (!authorized_client(client)) {
1436 msg2(LOG_INFO,"Unauthorized client") ;
1440 msg2(LOG_INFO,"Authorized client") ;
1441 pid=g_malloc(sizeof(pid_t));
1443 if ((*pid=fork())<0) {
1444 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1448 if (*pid>0) { /* parent */
1450 g_hash_table_insert(children, pid, pid);
1454 g_hash_table_destroy(children);
1455 for(i=0;i<servers->len;i++) {
1456 serve=&g_array_index(servers, SERVER, i);
1457 close(serve->socket);
1459 /* FALSE does not free the
1460 actual data. This is required,
1461 because the client has a
1462 direct reference into that
1463 data, and otherwise we get a
1465 g_array_free(servers, FALSE);
1467 msg2(LOG_INFO,"Starting to serve");
1468 serveconnection(client);
1477 * Connect a server's socket.
1479 * @param serve the server we want to connect.
1481 void setup_serve(SERVER *serve) {
1482 struct sockaddr_in addrin;
1483 struct sigaction sa;
1484 int addrinlen = sizeof(addrin);
1495 if ((serve->flags) && F_SDP) {
1499 if ((serve->socket = socket(af, SOCK_STREAM, IPPROTO_TCP)) < 0)
1502 /* lose the pesky "Address already in use" error message */
1503 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1504 err("setsockopt SO_REUSEADDR");
1506 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1507 err("setsockopt SO_KEEPALIVE");
1510 /* make the listening socket non-blocking */
1511 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1512 err("fcntl F_GETFL");
1514 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1515 err("fcntl F_SETFL O_NONBLOCK");
1518 DEBUG("Waiting for connections... bind, ");
1519 addrin.sin_family = AF_INET;
1521 if(serve->flags & F_SDP) {
1522 addrin.sin_family = AF_INET_SDP;
1525 addrin.sin_port = htons(serve->port);
1526 if(!inet_aton(serve->listenaddr, &(addrin.sin_addr)))
1527 err("could not parse listen address");
1528 if (bind(serve->socket, (struct sockaddr *) &addrin, addrinlen) < 0)
1531 if (listen(serve->socket, 1) < 0)
1533 sa.sa_handler = sigchld_handler;
1534 sigemptyset(&sa.sa_mask);
1535 sa.sa_flags = SA_RESTART;
1536 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1537 err("sigaction: %m");
1538 sa.sa_handler = sigterm_handler;
1539 sigemptyset(&sa.sa_mask);
1540 sa.sa_flags = SA_RESTART;
1541 if(sigaction(SIGTERM, &sa, NULL) == -1)
1542 err("sigaction: %m");
1546 * Connect our servers.
1548 void setup_servers(GArray* servers) {
1551 for(i=0;i<servers->len;i++) {
1552 setup_serve(&(g_array_index(servers, SERVER, i)));
1554 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1558 * Go daemon (unless we specified at compile time that we didn't want this)
1559 * @param serve the first server of our configuration. If its port is zero,
1560 * then do not daemonize, because we're doing inetd then. This parameter
1561 * is only used to create a PID file of the form
1562 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1564 #if !defined(NODAEMON) && !defined(NOFORK)
1565 void daemonize(SERVER* serve) {
1568 if(serve && !(serve->port)) {
1574 if(!*pidftemplate) {
1576 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1578 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1581 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1582 pidf=fopen(pidfname, "w");
1584 fprintf(pidf,"%d\n", (int)getpid());
1588 fprintf(stderr, "Not fatal; continuing");
1592 #define daemonize(serve)
1593 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1596 * Everything beyond this point (in the file) is run in non-daemon mode.
1597 * The stuff above daemonize() isn't.
1600 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1602 void serve_err(SERVER* serve, const char* msg) {
1603 g_message("Export of %s on port %d failed:", serve->exportname,
1609 * Set up user-ID and/or group-ID
1611 void dousers(void) {
1615 gr=getgrnam(rungroup);
1617 g_message("Invalid group name: %s", rungroup);
1620 if(setgid(gr->gr_gid)<0) {
1621 g_message("Could not set GID: %s", strerror(errno));
1626 pw=getpwnam(runuser);
1628 g_message("Invalid user name: %s", runuser);
1631 if(setuid(pw->pw_uid)<0) {
1632 g_message("Could not set UID: %s", strerror(errno));
1639 void glib_message_syslog_redirect(const gchar *log_domain,
1640 GLogLevelFlags log_level,
1641 const gchar *message,
1644 int level=LOG_DEBUG;
1648 case G_LOG_FLAG_FATAL:
1649 case G_LOG_LEVEL_CRITICAL:
1650 case G_LOG_LEVEL_ERROR:
1653 case G_LOG_LEVEL_WARNING:
1656 case G_LOG_LEVEL_MESSAGE:
1657 case G_LOG_LEVEL_INFO:
1660 case G_LOG_LEVEL_DEBUG:
1663 syslog(level, message);
1668 * Main entry point...
1670 int main(int argc, char *argv[]) {
1675 if (sizeof( struct nbd_request )!=28) {
1676 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1677 exit(EXIT_FAILURE) ;
1680 memset(pidftemplate, '\0', 256);
1683 config_file_pos = g_strdup(CFILE);
1684 serve=cmdline(argc, argv);
1685 servers = parse_cfile(config_file_pos, &err);
1688 g_array_append_val(servers, *serve);
1690 if (!(serve->port)) {
1693 /* You really should define ISSERVER if you're going to use
1694 * inetd mode, but if you don't, closing stdout and stderr
1695 * (which inetd had connected to the client socket) will let it
1699 open("/dev/null", O_WRONLY);
1700 open("/dev/null", O_WRONLY);
1701 g_log_set_default_handler( glib_message_syslog_redirect, NULL );
1703 client=g_malloc(sizeof(CLIENT));
1704 client->server=serve;
1706 client->exportsize=OFFT_MAX;
1707 set_peername(0,client);
1708 serveconnection(client);
1713 if(!servers || !servers->len) {
1714 g_warning("Could not parse config file: %s",
1715 err ? err->message : "Unknown error");
1718 if((!serve) && (!servers||!servers->len)) {
1719 g_message("Nothing to do! Bye!");
1723 setup_servers(servers);