2 * Network Block Device - server
4 * Copyright 1996-1998 Pavel Machek, distribute under GPL
5 * <pavel@atrey.karlin.mff.cuni.cz>
6 * Copyright 2001-2004 Wouter Verhelst <wouter@debian.org>
7 * Copyright 2002 Anton Altaparmakov <aia21@cam.ac.uk>
9 * Version 1.0 - hopefully 64-bit-clean
10 * Version 1.1 - merging enhancements from Josh Parsons, <josh@coombs.anu.edu.au>
11 * Version 1.2 - autodetect size of block devices, thanx to Peter T. Breuer" <ptb@it.uc3m.es>
12 * Version 1.5 - can compile on Unix systems that don't have 64 bit integer
13 * type, or don't have 64 bit file offsets by defining FS_32BIT
14 * in compile options for nbd-server *only*. This can be done
15 * with make FSCHOICE=-DFS_32BIT nbd-server. (I don't have the
16 * original autoconf input file, or I would make it a configure
17 * option.) Ken Yap <ken@nlc.net.au>.
18 * Version 1.6 - fix autodetection of block device size and really make 64 bit
19 * clean on 32 bit machines. Anton Altaparmakov <aia21@cam.ac.uk>
20 * Version 2.0 - Version synchronised with client
21 * Version 2.1 - Reap zombie client processes when they exit. Removed
22 * (uncommented) the _IO magic, it's no longer necessary. Wouter
23 * Verhelst <wouter@debian.org>
24 * Version 2.2 - Auto switch to read-only mode (usefull for floppies).
25 * Version 2.3 - Fixed code so that Large File Support works. This
26 * removes the FS_32BIT compile-time directive; define
27 * _FILE_OFFSET_BITS=64 and _LARGEFILE_SOURCE if you used to be
28 * using FS_32BIT. This will allow you to use files >2GB instead of
29 * having to use the -m option. Wouter Verhelst <wouter@debian.org>
30 * Version 2.4 - Added code to keep track of children, so that we can
31 * properly kill them from initscripts. Add a call to daemon(),
32 * so that processes don't think they have to wait for us, which is
33 * interesting for initscripts as well. Wouter Verhelst
35 * Version 2.5 - Bugfix release: forgot to reset child_arraysize to
36 * zero after fork()ing, resulting in nbd-server going berserk
37 * when it receives a signal with at least one child open. Wouter
38 * Verhelst <wouter@debian.org>
39 * 10/10/2003 - Added socket option SO_KEEPALIVE (sf.net bug 819235);
40 * rectified type of mainloop::size_host (sf.net bugs 814435 and
41 * 817385); close the PID file after writing to it, so that the
42 * daemon can actually be found. Wouter Verhelst
44 * 10/10/2003 - Size of the data "size_host" was wrong and so was not
45 * correctly put in network endianness. Many types were corrected
46 * (size_t and off_t instead of int). <vspaceg@sourceforge.net>
47 * Version 2.6 - Some code cleanup.
48 * Version 2.7 - Better build system.
49 * 11/02/2004 - Doxygenified the source, modularized it a bit. Needs a
50 * lot more work, but this is a start. Wouter Verhelst
54 /* Includes LFS defines, which defines behaviours of some of the following
55 * headers, so must come before those */
58 #include <sys/types.h>
59 #include <sys/socket.h>
61 #include <sys/select.h> /* select */
62 #include <sys/wait.h> /* wait */
63 #ifdef HAVE_SYS_IOCTL_H
64 #include <sys/ioctl.h>
66 #include <sys/param.h>
67 #ifdef HAVE_SYS_MOUNT_H
68 #include <sys/mount.h> /* For BLKGETSIZE */
70 #include <signal.h> /* sigaction */
72 #include <netinet/tcp.h>
73 #include <netinet/in.h> /* sockaddr_in, htons, in_addr */
74 #include <netdb.h> /* hostent, gethostby*, getservby* */
81 #include <arpa/inet.h>
91 /* used in cliserv.h, so must come first */
92 #define MY_NAME "nbd_server"
95 /** Default position of the config file */
97 #define SYSCONFDIR "/etc"
99 #define CFILE SYSCONFDIR "/nbd-server/config"
101 /** Where our config file actually is */
102 gchar* config_file_pos;
104 /** What user we're running as */
106 /** What group we're running as */
107 gchar* rungroup=NULL;
109 /** Logging macros, now nothing goes to syslog unless you say ISSERVER */
111 #define msg2(a,b) syslog(a,b)
112 #define msg3(a,b,c) syslog(a,b,c)
113 #define msg4(a,b,c,d) syslog(a,b,c,d)
115 #define msg2(a,b) g_message(b)
116 #define msg3(a,b,c) g_message(b,c)
117 #define msg4(a,b,c,d) g_message(b,c,d)
120 /* Debugging macros */
123 #define DEBUG( a ) printf( a )
124 #define DEBUG2( a,b ) printf( a,b )
125 #define DEBUG3( a,b,c ) printf( a,b,c )
126 #define DEBUG4( a,b,c,d ) printf( a,b,c,d )
129 #define DEBUG2( a,b )
130 #define DEBUG3( a,b,c )
131 #define DEBUG4( a,b,c,d )
133 #ifndef PACKAGE_VERSION
134 #define PACKAGE_VERSION ""
137 * The highest value a variable of type off_t can reach. This is a signed
138 * integer, so set all bits except for the leftmost one.
140 #define OFFT_MAX ~((off_t)1<<(sizeof(off_t)*8-1))
141 #define LINELEN 256 /**< Size of static buffer used to read the
142 authorization file (yuck) */
143 #define BUFSIZE (1024*1024) /**< Size of buffer that can hold requests */
144 #define DIFFPAGESIZE 4096 /**< diff file uses those chunks */
145 #define F_READONLY 1 /**< flag to tell us a file is readonly */
146 #define F_MULTIFILE 2 /**< flag to tell us a file is exported using -m */
147 #define F_COPYONWRITE 4 /**< flag to tell us a file is exported using
149 #define F_AUTOREADONLY 8 /**< flag to tell us a file is set to autoreadonly */
150 #define F_SPARSE 16 /**< flag to tell us copyronwrite should use a sparse file */
151 #define F_SDP 32 /**< flag to tell us the export should be done using the Socket Direct Protocol for RDMA */
152 #define F_SYNC 64 /**< Whether to fsync() after a write */
153 GHashTable *children;
154 char pidfname[256]; /**< name of our PID file */
155 char pidftemplate[256]; /**< template to be used for the filename of the PID file */
156 char default_authname[] = SYSCONFDIR "/nbd-server/allow"; /**< default name of allow file */
159 * Types of virtuatlization
162 VIRT_NONE=0, /**< No virtualization */
163 VIRT_IPLIT, /**< Literal IP address as part of the filename */
164 VIRT_IPHASH, /**< Replacing all dots in an ip address by a / before
165 doing the same as in IPLIT */
166 VIRT_CIDR, /**< Every subnet in its own directory */
170 * Variables associated with a server.
173 gchar* exportname; /**< (unprocessed) filename of the file we're exporting */
174 off_t expected_size; /**< size of the exported file as it was told to
175 us through configuration */
176 gchar* listenaddr; /**< The IP address we're listening on */
177 unsigned int port; /**< port we're exporting this file at */
178 char* authname; /**< filename of the authorization file */
179 int flags; /**< flags associated with this exported file */
180 int socket; /**< The socket of this server. */
181 VIRT_STYLE virtstyle;/**< The style of virtualization, if any */
182 uint8_t cidrlen; /**< The length of the mask when we use
183 CIDR-style virtualization */
184 gchar* prerun; /**< command to be ran after connecting a client,
185 but before starting to serve */
186 gchar* postrun; /**< command that will be ran after the client
191 * Variables associated with a client socket.
194 int fhandle; /**< file descriptor */
195 off_t startoff; /**< starting offset of this file */
199 off_t exportsize; /**< size of the file we're exporting */
200 char *clientname; /**< peer */
201 char *exportname; /**< (processed) filename of the file we're exporting */
202 GArray *export; /**< array of FILE_INFO of exported files;
203 array size is always 1 unless we're
204 doing the multiple file option */
205 int net; /**< The actual client socket */
206 SERVER *server; /**< The server this client is getting data from */
207 char* difffilename; /**< filename of the copy-on-write file, if any */
208 int difffile; /**< filedescriptor of copyonwrite file. @todo
209 shouldn't this be an array too? (cfr export) Or
210 make -m and -c mutually exclusive */
211 u32 difffilelen; /**< number of pages in difffile */
212 u32 *difmap; /**< see comment on the global difmap for this one */
216 * Type of configuration file values
219 PARAM_INT, /**< This parameter is an integer */
220 PARAM_STRING, /**< This parameter is a string */
221 PARAM_BOOL, /**< This parameter is a boolean */
225 * Configuration file values
228 gchar *paramname; /**< Name of the parameter, as it appears in
230 gboolean required; /**< Whether this is a required (as opposed to
231 optional) parameter */
232 PARAM_TYPE ptype; /**< Type of the parameter. */
233 gpointer target; /**< Pointer to where the data of this
234 parameter should be written. If ptype is
235 PARAM_BOOL, the data is or'ed rather than
237 gint flagval; /**< Flag mask for this parameter in case ptype
242 * Check whether a client is allowed to connect. Works with an authorization
243 * file which contains one line per machine, no wildcards.
245 * @param opts The client who's trying to connect.
246 * @return 0 - authorization refused, 1 - OK
248 int authorized_client(CLIENT *opts) {
249 const char *ERRMSG="Invalid entry '%s' in authfile '%s', so, refusing all connections.";
254 struct in_addr client;
255 struct in_addr cltemp;
258 if ((f=fopen(opts->server->authname,"r"))==NULL) {
259 msg4(LOG_INFO,"Can't open authorization file %s (%s).",
260 opts->server->authname,strerror(errno)) ;
264 inet_aton(opts->clientname, &client);
265 while (fgets(line,LINELEN,f)!=NULL) {
266 if((tmp=index(line, '/'))) {
267 if(strlen(line)<=tmp-line) {
268 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
272 if(inet_aton(line,&addr)) {
273 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
276 len=strtol(tmp, NULL, 0);
277 addr.s_addr>>=32-len;
278 addr.s_addr<<=32-len;
279 memcpy(&cltemp,&client,sizeof(client));
280 cltemp.s_addr>>=32-len;
281 cltemp.s_addr<<=32-len;
282 if(addr.s_addr == cltemp.s_addr) {
286 if (strncmp(line,opts->clientname,strlen(opts->clientname))==0) {
296 * Read data from a file descriptor into a buffer
298 * @param f a file descriptor
299 * @param buf a buffer
300 * @param len the number of bytes to be read
302 inline void readit(int f, void *buf, size_t len) {
306 if ((res = read(f, buf, len)) <= 0)
307 err("Read failed: %m");
314 * Write data from a buffer into a filedescriptor
316 * @param f a file descriptor
317 * @param buf a buffer containing data
318 * @param len the number of bytes to be written
320 inline void writeit(int f, void *buf, size_t len) {
324 if ((res = write(f, buf, len)) <= 0)
325 err("Send failed: %m");
332 * Print out a message about how to use nbd-server. Split out to a separate
333 * function so that we can call it from multiple places
336 printf("This is nbd-server version " VERSION "\n");
337 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"
338 "\t-r|--read-only\t\tread only\n"
339 "\t-m|--multi-file\t\tmultiple file\n"
340 "\t-c|--copy-on-write\tcopy on write\n"
341 "\t-C|--config-file\tspecify an alternate configuration file\n"
342 "\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
343 "\t-a|--idle-time\t\tmaximum idle seconds; server terminates when\n\t\t\t\tidle time exceeded\n"
344 "\t-p|--pid-file\t\tspecify a filename to write our PID to\n"
345 "\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"
346 "\tif port is set to 0, stdin is used (for running from inetd)\n"
347 "\tif file_to_export contains '%%s', it is substituted with the IP\n"
348 "\t\taddress of the machine trying to connect\n"
349 "\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");
350 printf("Using configuration file %s\n", CFILE);
353 /* Dumps a config file section of the given SERVER*, and exits. */
354 void dump_section(SERVER* serve, gchar* section_header) {
355 printf("[%s]\n", section_header);
356 printf("\texportname = %s\n", serve->exportname);
357 printf("\tlistenaddr = %s\n", serve->listenaddr);
358 printf("\tport = %d\n", serve->port);
359 if(serve->flags & F_READONLY) {
360 printf("\treadonly = true\n");
362 if(serve->flags & F_MULTIFILE) {
363 printf("\tmultifile = true\n");
365 if(serve->flags & F_COPYONWRITE) {
366 printf("\tcopyonwrite = true\n");
368 if(serve->expected_size) {
369 printf("\tfilesize = %lld\n", (long long int)serve->expected_size);
371 if(serve->authname) {
372 printf("\tauthfile = %s\n", serve->authname);
378 * Parse the command line.
380 * @param argc the argc argument to main()
381 * @param argv the argv argument to main()
383 SERVER* cmdline(int argc, char *argv[]) {
387 struct option long_options[] = {
388 {"read-only", no_argument, NULL, 'r'},
389 {"multi-file", no_argument, NULL, 'm'},
390 {"copy-on-write", no_argument, NULL, 'c'},
391 {"authorize-file", required_argument, NULL, 'l'},
392 {"idle-time", required_argument, NULL, 'a'},
393 {"config-file", required_argument, NULL, 'C'},
394 {"pid-file", required_argument, NULL, 'p'},
395 {"output-config", required_argument, NULL, 'o'},
402 gboolean do_output=FALSE;
403 gchar* section_header="";
409 serve=g_new0(SERVER, 1);
410 serve->authname = g_strdup(default_authname);
411 serve->virtstyle=VIRT_IPLIT;
412 while((c=getopt_long(argc, argv, "-a:C:cl:mo:rp:", long_options, &i))>=0) {
415 /* non-option argument */
416 switch(nonspecial++) {
418 addr_port=g_strsplit(optarg, ":", 2);
420 serve->port=strtol(addr_port[1], NULL, 0);
421 serve->listenaddr=g_strdup(addr_port[0]);
423 serve->listenaddr=g_strdup("0.0.0.0");
424 serve->port=strtol(addr_port[0], NULL, 0);
426 g_strfreev(addr_port);
429 serve->exportname = g_strdup(optarg);
430 if(serve->exportname[0] != '/') {
431 fprintf(stderr, "E: The to be exported file needs to be an absolute filename!\n");
436 last=strlen(optarg)-1;
438 if (suffix == 'k' || suffix == 'K' ||
439 suffix == 'm' || suffix == 'M')
441 es = (off_t)atoll(optarg);
449 serve->expected_size = es;
454 serve->flags |= F_READONLY;
457 serve->flags |= F_MULTIFILE;
461 section_header = g_strdup(optarg);
464 strncpy(pidftemplate, optarg, 256);
467 serve->flags |=F_COPYONWRITE;
470 g_free(config_file_pos);
471 config_file_pos=g_strdup(optarg);
474 g_free(serve->authname);
475 serve->authname=g_strdup(optarg);
483 /* What's left: the port to export, the name of the to be exported
484 * file, and, optionally, the size of the file, in that order. */
491 g_critical("Need a complete configuration on the command line to output a config file section!");
494 dump_section(serve, section_header);
500 * Error codes for config file parsing
503 CFILE_NOTFOUND, /**< The configuration file is not found */
504 CFILE_MISSING_GENERIC, /**< The (required) group "generic" is missing */
505 CFILE_KEY_MISSING, /**< A (required) key is missing */
506 CFILE_VALUE_INVALID, /**< A value is syntactically invalid */
507 CFILE_VALUE_UNSUPPORTED,/**< A value is not supported in this build */
508 CFILE_PROGERR, /**< Programmer error */
509 CFILE_NO_EXPORTS /**< A config file was specified that does not
510 define any exports */
514 * Remove a SERVER from memory. Used from the hash table
516 void remove_server(gpointer s) {
520 g_free(server->exportname);
522 g_free(server->authname);
527 * Parse the config file.
529 * @param f the name of the config file
530 * @param e a GError. @see CFILE_ERRORS for what error values this function can
532 * @return a Array of SERVER* pointers, If the config file is empty or does not
533 * exist, returns an empty GHashTable; if the config file contains an
534 * error, returns NULL, and e is set appropriately
536 GArray* parse_cfile(gchar* f, GError** e) {
537 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
538 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
540 gchar *virtstyle=NULL;
542 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
543 { "port", TRUE, PARAM_INT, NULL, 0 },
544 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
545 { "filesize", FALSE, PARAM_INT, NULL, 0 },
546 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
547 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
548 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
549 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
550 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
551 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
552 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
553 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
554 { "sync", FALSE, PARAM_BOOL, NULL, F_SYNC },
555 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
557 const int lp_size=sizeof(lp)/sizeof(PARAM);
559 { "user", FALSE, PARAM_STRING, &runuser, 0 },
560 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
563 int p_size=sizeof(gp)/sizeof(PARAM);
566 const char *err_msg=NULL;
575 errdomain = g_quark_from_string("parse_cfile");
576 cfile = g_key_file_new();
577 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
578 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
579 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
580 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file.");
581 g_key_file_free(cfile);
584 startgroup = g_key_file_get_start_group(cfile);
585 if(!startgroup || strcmp(startgroup, "generic")) {
586 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
587 g_key_file_free(cfile);
590 groups = g_key_file_get_groups(cfile, NULL);
591 for(i=0;groups[i];i++) {
592 memset(&s, '\0', sizeof(SERVER));
593 lp[0].target=&(s.exportname);
594 lp[1].target=&(s.port);
595 lp[2].target=&(s.authname);
596 lp[3].target=&(s.expected_size);
597 lp[4].target=&(virtstyle);
598 lp[5].target=&(s.prerun);
599 lp[6].target=&(s.postrun);
600 lp[7].target=lp[8].target=lp[9].target=
601 lp[10].target=lp[11].target=
602 lp[12].target=&(s.flags);
603 lp[13].target=&(s.listenaddr);
605 /* After the [generic] group, start parsing exports */
610 for(j=0;j<p_size;j++) {
611 g_assert(p[j].target != NULL);
612 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
615 *((gint*)p[j].target) =
616 g_key_file_get_integer(cfile,
622 *((gchar**)p[j].target) =
623 g_key_file_get_string(cfile,
629 value = g_key_file_get_boolean(cfile,
631 p[j].paramname, &err);
634 *((gint*)p[j].target) |= p[j].flagval;
636 *((gint*)p[j].target) &= ~(p[j].flagval);
642 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
644 /* Ignore not-found error for optional values */
648 err_msg = MISSING_REQUIRED_ERROR;
651 err_msg = DEFAULT_ERROR;
653 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
654 g_array_free(retval, TRUE);
656 g_key_file_free(cfile);
661 if(!strncmp(virtstyle, "none", 4)) {
662 s.virtstyle=VIRT_NONE;
663 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
664 s.virtstyle=VIRT_IPLIT;
665 } else if(!strncmp(virtstyle, "iphash", 6)) {
666 s.virtstyle=VIRT_IPHASH;
667 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
668 s.virtstyle=VIRT_CIDR;
669 if(strlen(virtstyle)<10) {
670 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
671 g_array_free(retval, TRUE);
672 g_key_file_free(cfile);
675 s.cidrlen=strtol(virtstyle+8, NULL, 0);
677 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
678 g_array_free(retval, TRUE);
679 g_key_file_free(cfile);
683 s.virtstyle=VIRT_IPLIT;
685 /* Don't need to free this, it's not our string */
687 /* Don't append values for the [generic] group */
690 s.listenaddr = g_strdup("0.0.0.0");
692 g_array_append_val(retval, s);
695 if(s.flags & F_SDP) {
696 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
697 g_array_free(retval, TRUE);
698 g_key_file_free(cfile);
704 g_set_error(e, errdomain, CFILE_NO_EXPORTS, "The config file does not specify any exports");
706 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) {
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 BLKGETSIZE64\n");
784 if (!ioctl(fhandle, BLKGETSIZE64, bytes) && bytes) {
787 #endif /* BLKGETSIZE64 */
788 #endif /* HAVE_SYS_IOCTL_H */
789 #endif /* HAVE_SYS_MOUNT_H */
791 DEBUG("looking for fhandle size with fstat\n");
792 stat_buf.st_size = 0;
793 error = fstat(fhandle, &stat_buf);
795 if(stat_buf.st_size > 0)
796 return (off_t)stat_buf.st_size;
798 err("fstat failed: %m");
801 DEBUG("looking for fhandle size with lseek SEEK_END\n");
802 es = lseek(fhandle, (off_t)0, SEEK_END);
803 if (es > ((off_t)0)) {
806 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
809 err("Could not find size of exported block device: %m");
814 * Get the file handle and offset, given an export offset.
816 * @param export An array of export files
817 * @param a The offset to get corresponding file/offset for
818 * @param fhandle [out] File descriptor
819 * @param foffset [out] Offset into fhandle
820 * @param maxbytes [out] Tells how many bytes can be read/written
821 * from fhandle starting at foffset (0 if there is no limit)
822 * @return 0 on success, -1 on failure
824 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
825 /* Negative offset not allowed */
829 /* Binary search for last file with starting offset <= a */
832 int end = export->len - 1;
833 while( start <= end ) {
834 int mid = (start + end) / 2;
835 fi = g_array_index(export, FILE_INFO, mid);
836 if( fi.startoff < a ) {
838 } else if( fi.startoff > a ) {
846 /* end should never go negative, since first startoff is 0 and a >= 0 */
849 fi = g_array_index(export, FILE_INFO, end);
850 *fhandle = fi.fhandle;
851 *foffset = a - fi.startoff;
853 if( end+1 < export->len ) {
854 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
855 *maxbytes = fi_next.startoff - a;
862 * seek to a position in a file, with error handling.
863 * @param handle a filedescriptor
864 * @param a position to seek to
865 * @todo get rid of this; lastpoint is a global variable right now, but it
866 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
869 void myseek(int handle,off_t a) {
870 if (lseek(handle, a, SEEK_SET) < 0) {
871 err("Can not seek locally!\n");
876 * Write an amount of bytes at a given offset to the right file. This
877 * abstracts the write-side of the multiple file option.
879 * @param a The offset where the write should start
880 * @param buf The buffer to write from
881 * @param len The length of buf
882 * @param client The client we're serving for
883 * @return The number of bytes actually written, or -1 in case of an error
885 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 %llu len %u), ", fhandle, foffset, len);
898 myseek(fhandle, foffset);
899 retval = write(fhandle, buf, len);
900 if(client->server->flags & F_SYNC) {
907 * Call rawexpwrite repeatedly until all data has been written.
908 * @return 0 on success, nonzero on failure
910 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
913 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
918 return (ret < 0 || len != 0);
922 * Read an amount of bytes at a given offset from the right file. This
923 * abstracts the read-side of the multiple files option.
925 * @param a The offset where the read should start
926 * @param buf A buffer to read into
927 * @param len The size of buf
928 * @param client The client we're serving for
929 * @return The number of bytes actually read, or -1 in case of an
932 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
937 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
939 if(maxbytes && len > maxbytes)
942 DEBUG4("(READ from fd %d offset %llu len %u), ", fhandle, foffset, len);
944 myseek(fhandle, foffset);
945 return read(fhandle, buf, len);
949 * Call rawexpread repeatedly until all data has been read.
950 * @return 0 on success, nonzero on failure
952 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
955 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
960 return (ret < 0 || len != 0);
964 * Read an amount of bytes at a given offset from the right file. This
965 * abstracts the read-side of the copyonwrite stuff, and calls
966 * rawexpread() with the right parameters to do the actual work.
967 * @param a The offset where the read should start
968 * @param buf A buffer to read into
969 * @param len The size of buf
970 * @param client The client we're going to read for
971 * @return 0 on success, nonzero on failure
973 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
975 off_t mapcnt, mapl, maph, pagestart;
977 if (!(client->server->flags & F_COPYONWRITE))
978 return(rawexpread_fully(a, buf, len, client));
979 DEBUG3("Asked to read %d bytes at %llu.\n", len, (unsigned long long)a);
981 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
983 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
984 pagestart=mapcnt*DIFFPAGESIZE;
986 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
987 len : (size_t)DIFFPAGESIZE-offset;
988 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
989 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
990 (unsigned long)(client->difmap[mapcnt]));
991 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
992 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
993 } else { /* the block is not there */
994 DEBUG2("Page %llu is not here, we read the original one\n",
995 (unsigned long long)mapcnt);
996 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
998 len-=rdlen; a+=rdlen; buf+=rdlen;
1004 * Write an amount of bytes at a given offset to the right file. This
1005 * abstracts the write-side of the copyonwrite option, and calls
1006 * rawexpwrite() with the right parameters to do the actual work.
1008 * @param a The offset where the write should start
1009 * @param buf The buffer to write from
1010 * @param len The length of buf
1011 * @param client The client we're going to write for.
1012 * @return 0 on success, nonzero on failure
1014 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1015 char pagebuf[DIFFPAGESIZE];
1016 off_t mapcnt,mapl,maph;
1021 if (!(client->server->flags & F_COPYONWRITE))
1022 return(rawexpwrite_fully(a, buf, len, client));
1023 DEBUG3("Asked to write %d bytes at %llu.\n", len, (unsigned long long)a);
1025 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1027 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1028 pagestart=mapcnt*DIFFPAGESIZE ;
1029 offset=a-pagestart ;
1030 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1031 len : (size_t)DIFFPAGESIZE-offset;
1033 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1034 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1035 (unsigned long)(client->difmap[mapcnt])) ;
1036 myseek(client->difffile,
1037 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1038 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1039 } else { /* the block is not there */
1040 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1041 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1042 DEBUG3("Page %llu is not here, we put it at %lu\n",
1043 (unsigned long long)mapcnt,
1044 (unsigned long)(client->difmap[mapcnt]));
1045 rdlen=DIFFPAGESIZE ;
1046 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1048 memcpy(pagebuf+offset,buf,wrlen) ;
1049 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1053 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1059 * Do the initial negotiation.
1061 * @param client The client we're negotiating with.
1063 void negotiate(CLIENT *client) {
1066 u32 flags = NBD_FLAG_HAS_FLAGS;
1068 memset(zeros, '\0', sizeof(zeros));
1069 if (write(client->net, INIT_PASSWD, 8) < 0)
1070 err("Negotiation failed: %m");
1071 cliserv_magic = htonll(cliserv_magic);
1072 if (write(client->net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
1073 err("Negotiation failed: %m");
1074 size_host = htonll((u64)(client->exportsize));
1075 if (write(client->net, &size_host, 8) < 0)
1076 err("Negotiation failed: %m");
1077 if (client->server->flags & F_READONLY)
1078 flags |= NBD_FLAG_READ_ONLY;
1079 flags = htonl(flags);
1080 if (write(client->net, &flags, 4) < 0)
1081 err("Negotiation failed: %m");
1082 if (write(client->net, zeros, 124) < 0)
1083 err("Negotiation failed: %m");
1086 /** sending macro. */
1087 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1089 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1091 * Serve a file to a single client.
1093 * @todo This beast needs to be split up in many tiny little manageable
1094 * pieces. Preferably with a chainsaw.
1096 * @param client The client we're going to serve to.
1097 * @return when the client disconnects
1099 int mainloop(CLIENT *client) {
1100 struct nbd_request request;
1101 struct nbd_reply reply;
1102 gboolean go_on=TRUE;
1107 DEBUG("Entering request loop!\n");
1108 reply.magic = htonl(NBD_REPLY_MAGIC);
1117 readit(client->net, &request, sizeof(request));
1118 request.from = ntohll(request.from);
1119 request.type = ntohl(request.type);
1121 if (request.type==NBD_CMD_DISC) {
1122 msg2(LOG_INFO, "Disconnect request received.");
1123 if (client->server->flags & F_COPYONWRITE) {
1124 if (client->difmap) g_free(client->difmap) ;
1125 close(client->difffile);
1126 unlink(client->difffilename);
1127 free(client->difffilename);
1133 len = ntohl(request.len);
1135 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1136 err("Not enough magic.");
1137 if (len > BUFSIZE + sizeof(struct nbd_reply))
1138 err("Request too big!");
1140 printf("%s from %llu (%llu) len %d, ", request.type ? "WRITE" :
1141 "READ", (unsigned long long)request.from,
1142 (unsigned long long)request.from / 512, len);
1144 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1145 if ((request.from + len) > (OFFT_MAX)) {
1146 DEBUG("[Number too large!]");
1147 ERROR(client, reply, EINVAL);
1151 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1153 ERROR(client, reply, EINVAL);
1157 if (request.type==NBD_CMD_WRITE) {
1158 DEBUG("wr: net->buf, ");
1159 readit(client->net, buf, len);
1160 DEBUG("buf->exp, ");
1161 if ((client->server->flags & F_READONLY) ||
1162 (client->server->flags & F_AUTOREADONLY)) {
1163 DEBUG("[WRITE to READONLY!]");
1164 ERROR(client, reply, EPERM);
1167 if (expwrite(request.from, buf, len, client)) {
1168 DEBUG("Write failed: %m" );
1169 ERROR(client, reply, errno);
1172 SEND(client->net, reply);
1178 DEBUG("exp->buf, ");
1179 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1180 DEBUG("Read failed: %m");
1181 ERROR(client, reply, errno);
1185 DEBUG("buf->net, ");
1186 memcpy(buf, &reply, sizeof(struct nbd_reply));
1187 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1194 * Set up client export array, which is an array of FILE_INFO.
1195 * Also, split a single exportfile into multiple ones, if that was asked.
1196 * @param client information on the client which we want to setup export for
1198 void setupexport(CLIENT* client) {
1200 off_t laststartoff = 0, lastsize = 0;
1201 int multifile = (client->server->flags & F_MULTIFILE);
1203 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1205 /* If multi-file, open as many files as we can.
1206 * If not, open exactly one file.
1207 * Calculate file sizes as we go to get total size. */
1211 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1214 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1216 tmpname=g_strdup(client->exportname);
1218 DEBUG2( "Opening %s\n", tmpname );
1219 fi.fhandle = open(tmpname, mode);
1220 if(fi.fhandle == -1 && mode == O_RDWR) {
1221 /* Try again because maybe media was read-only */
1222 fi.fhandle = open(tmpname, O_RDONLY);
1223 if(fi.fhandle != -1) {
1224 /* Opening the base file in copyonwrite mode is
1226 if(!(client->server->flags & F_COPYONWRITE)) {
1227 client->server->flags |= F_AUTOREADONLY;
1228 client->server->flags |= F_READONLY;
1232 if(fi.fhandle == -1) {
1233 if(multifile && i>0)
1235 err("Could not open exported file: %m");
1237 fi.startoff = laststartoff + lastsize;
1238 g_array_append_val(client->export, fi);
1241 /* Starting offset and size of this file will be used to
1242 * calculate starting offset of next file */
1243 laststartoff = fi.startoff;
1244 lastsize = size_autodetect(fi.fhandle);
1250 /* Set export size to total calculated size */
1251 client->exportsize = laststartoff + lastsize;
1253 /* Export size may be overridden */
1254 if(client->server->expected_size) {
1255 /* desired size must be <= total calculated size */
1256 if(client->server->expected_size > client->exportsize) {
1257 err("Size of exported file is too big\n");
1260 client->exportsize = client->server->expected_size;
1263 msg3(LOG_INFO, "Size of exported file/device is %llu", (unsigned long long)client->exportsize);
1265 msg3(LOG_INFO, "Total number of files: %d", i);
1269 int copyonwrite_prepare(CLIENT* client) {
1271 if ((client->difffilename = malloc(1024))==NULL)
1272 err("Failed to allocate string for diff file name");
1273 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1275 client->difffilename[1023]='\0';
1276 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1277 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1278 if (client->difffile<0) err("Could not create diff file (%m)") ;
1279 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1280 err("Could not allocate memory") ;
1281 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1287 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1290 * @param command the command to be ran. Read from the config file
1291 * @param file the file name we're about to export
1293 int do_run(gchar* command, gchar* file) {
1297 if(command && *command) {
1298 cmd = g_strdup_printf(command, file);
1306 * Serve a connection.
1308 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1309 * follow the road map.
1311 * @param client a connected client
1313 void serveconnection(CLIENT *client) {
1314 if(do_run(client->server->prerun, client->exportname)) {
1317 setupexport(client);
1319 if (client->server->flags & F_COPYONWRITE) {
1320 copyonwrite_prepare(client);
1323 setmysockopt(client->net);
1326 do_run(client->server->postrun, client->exportname);
1330 * Find the name of the file we have to serve. This will use g_strdup_printf
1331 * to put the IP address of the client inside a filename containing
1332 * "%s" (in the form as specified by the "virtstyle" option). That name
1333 * is then written to client->exportname.
1335 * @param net A socket connected to an nbd client
1336 * @param client information about the client. The IP address in human-readable
1337 * format will be written to a new char* buffer, the address of which will be
1338 * stored in client->clientname.
1340 void set_peername(int net, CLIENT *client) {
1341 struct sockaddr_in addrin;
1342 struct sockaddr_in netaddr;
1343 size_t addrinlen = sizeof( addrin );
1349 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1350 err("getsockname failed: %m");
1351 peername = g_strdup(inet_ntoa(addrin.sin_addr));
1352 switch(client->server->virtstyle) {
1354 client->exportname=g_strdup(client->server->exportname);
1357 for(i=0;i<strlen(peername);i++) {
1358 if(peername[i]=='.') {
1363 client->exportname=g_strdup_printf(client->server->exportname, peername);
1366 memcpy(&netaddr, &addrin, addrinlen);
1367 netaddr.sin_addr.s_addr>>=32-(client->server->cidrlen);
1368 netaddr.sin_addr.s_addr<<=32-(client->server->cidrlen);
1369 netname = inet_ntoa(netaddr.sin_addr);
1370 tmp=g_strdup_printf("%s/%s", netname, peername);
1371 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1375 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1376 peername, client->exportname);
1377 client->clientname=g_strdup(peername);
1383 * @param data a pointer to pid_t which should be freed
1385 void destroy_pid_t(gpointer data) {
1390 * Loop through the available servers, and serve them. Never returns.
1392 int serveloop(GArray* servers) {
1393 struct sockaddr_in addrin;
1394 socklen_t addrinlen=sizeof(addrin);
1403 * Set up the master fd_set. The set of descriptors we need
1404 * to select() for never changes anyway and it buys us a *lot*
1405 * of time to only build this once. However, if we ever choose
1406 * to not fork() for clients anymore, we may have to revisit
1411 for(i=0;i<servers->len;i++) {
1412 sock=(g_array_index(servers, SERVER, i)).socket;
1413 FD_SET(sock, &mset);
1414 max=sock>max?sock:max;
1421 memcpy(&rset, &mset, sizeof(fd_set));
1422 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1424 for(i=0;i<servers->len;i++) {
1425 serve=&(g_array_index(servers, SERVER, i));
1426 if(FD_ISSET(serve->socket, &rset)) {
1428 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1431 if((sock_flags = fcntl(net, F_GETFL, 0))==-1) {
1432 err("fcntl F_GETFL");
1434 if(fcntl(net, F_SETFL, sock_flags &~O_NONBLOCK)==-1) {
1435 err("fcntl F_SETFL ~O_NONBLOCK");
1437 client = g_malloc(sizeof(CLIENT));
1438 client->server=serve;
1439 client->exportsize=OFFT_MAX;
1441 set_peername(net, client);
1442 if (!authorized_client(client)) {
1443 msg2(LOG_INFO,"Unauthorized client") ;
1447 msg2(LOG_INFO,"Authorized client") ;
1448 pid=g_malloc(sizeof(pid_t));
1450 if ((*pid=fork())<0) {
1451 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1455 if (*pid>0) { /* parent */
1457 g_hash_table_insert(children, pid, pid);
1461 g_hash_table_destroy(children);
1462 for(i=0;i<servers->len;i++) {
1463 serve=&g_array_index(servers, SERVER, i);
1464 close(serve->socket);
1466 /* FALSE does not free the
1467 actual data. This is required,
1468 because the client has a
1469 direct reference into that
1470 data, and otherwise we get a
1472 g_array_free(servers, FALSE);
1474 msg2(LOG_INFO,"Starting to serve");
1475 serveconnection(client);
1484 * Connect a server's socket.
1486 * @param serve the server we want to connect.
1488 void setup_serve(SERVER *serve) {
1489 struct sockaddr_in addrin;
1490 struct sigaction sa;
1491 int addrinlen = sizeof(addrin);
1502 if ((serve->flags) && F_SDP) {
1506 if ((serve->socket = socket(af, SOCK_STREAM, IPPROTO_TCP)) < 0)
1509 /* lose the pesky "Address already in use" error message */
1510 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1511 err("setsockopt SO_REUSEADDR");
1513 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1514 err("setsockopt SO_KEEPALIVE");
1517 /* make the listening socket non-blocking */
1518 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1519 err("fcntl F_GETFL");
1521 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1522 err("fcntl F_SETFL O_NONBLOCK");
1525 DEBUG("Waiting for connections... bind, ");
1526 addrin.sin_family = AF_INET;
1528 if(serve->flags & F_SDP) {
1529 addrin.sin_family = AF_INET_SDP;
1532 addrin.sin_port = htons(serve->port);
1533 if(!inet_aton(serve->listenaddr, &(addrin.sin_addr)))
1534 err("could not parse listen address");
1535 if (bind(serve->socket, (struct sockaddr *) &addrin, addrinlen) < 0)
1538 if (listen(serve->socket, 1) < 0)
1540 sa.sa_handler = sigchld_handler;
1541 sigemptyset(&sa.sa_mask);
1542 sa.sa_flags = SA_RESTART;
1543 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1544 err("sigaction: %m");
1545 sa.sa_handler = sigterm_handler;
1546 sigemptyset(&sa.sa_mask);
1547 sa.sa_flags = SA_RESTART;
1548 if(sigaction(SIGTERM, &sa, NULL) == -1)
1549 err("sigaction: %m");
1553 * Connect our servers.
1555 void setup_servers(GArray* servers) {
1558 for(i=0;i<servers->len;i++) {
1559 setup_serve(&(g_array_index(servers, SERVER, i)));
1561 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1565 * Go daemon (unless we specified at compile time that we didn't want this)
1566 * @param serve the first server of our configuration. If its port is zero,
1567 * then do not daemonize, because we're doing inetd then. This parameter
1568 * is only used to create a PID file of the form
1569 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1571 #if !defined(NODAEMON) && !defined(NOFORK)
1572 void daemonize(SERVER* serve) {
1575 if(serve && !(serve->port)) {
1581 if(!*pidftemplate) {
1583 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1585 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1588 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1589 pidf=fopen(pidfname, "w");
1591 fprintf(pidf,"%d\n", (int)getpid());
1595 fprintf(stderr, "Not fatal; continuing");
1599 #define daemonize(serve)
1600 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1603 * Everything beyond this point (in the file) is run in non-daemon mode.
1604 * The stuff above daemonize() isn't.
1607 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1609 void serve_err(SERVER* serve, const char* msg) {
1610 g_message("Export of %s on port %d failed:", serve->exportname,
1616 * Set up user-ID and/or group-ID
1618 void dousers(void) {
1622 gr=getgrnam(rungroup);
1624 g_message("Invalid group name: %s", rungroup);
1627 if(setgid(gr->gr_gid)<0) {
1628 g_message("Could not set GID: %s", strerror(errno));
1633 pw=getpwnam(runuser);
1635 g_message("Invalid user name: %s", runuser);
1638 if(setuid(pw->pw_uid)<0) {
1639 g_message("Could not set UID: %s", strerror(errno));
1646 void glib_message_syslog_redirect(const gchar *log_domain,
1647 GLogLevelFlags log_level,
1648 const gchar *message,
1651 int level=LOG_DEBUG;
1655 case G_LOG_FLAG_FATAL:
1656 case G_LOG_LEVEL_CRITICAL:
1657 case G_LOG_LEVEL_ERROR:
1660 case G_LOG_LEVEL_WARNING:
1663 case G_LOG_LEVEL_MESSAGE:
1664 case G_LOG_LEVEL_INFO:
1667 case G_LOG_LEVEL_DEBUG:
1670 syslog(level, message);
1675 * Main entry point...
1677 int main(int argc, char *argv[]) {
1682 if (sizeof( struct nbd_request )!=28) {
1683 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1684 exit(EXIT_FAILURE) ;
1687 memset(pidftemplate, '\0', 256);
1690 config_file_pos = g_strdup(CFILE);
1691 serve=cmdline(argc, argv);
1692 servers = parse_cfile(config_file_pos, &err);
1695 g_array_append_val(servers, *serve);
1697 if (!(serve->port)) {
1700 /* You really should define ISSERVER if you're going to use
1701 * inetd mode, but if you don't, closing stdout and stderr
1702 * (which inetd had connected to the client socket) will let it
1706 open("/dev/null", O_WRONLY);
1707 open("/dev/null", O_WRONLY);
1708 g_log_set_default_handler( glib_message_syslog_redirect, NULL );
1710 client=g_malloc(sizeof(CLIENT));
1711 client->server=serve;
1713 client->exportsize=OFFT_MAX;
1714 set_peername(0,client);
1715 serveconnection(client);
1720 if(!servers || !servers->len) {
1721 g_warning("Could not parse config file: %s",
1722 err ? err->message : "Unknown error");
1725 if((!serve) && (!servers||!servers->len)) {
1726 g_message("Nothing to do! Bye!");
1730 setup_servers(servers);