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 gchar* cowname; /**< template for the filename of the copy-on-write file */
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 unsigned int timeout;/**< how long a connection may be idle
182 int socket; /**< The socket of this server. */
183 VIRT_STYLE virtstyle;/**< The style of virtualization, if any */
184 uint8_t cidrlen; /**< The length of the mask when we use
185 CIDR-style virtualization */
186 gchar* prerun; /**< command to be ran after connecting a client,
187 but before starting to serve */
188 gchar* postrun; /**< command that will be ran after the client
193 * Variables associated with a client socket.
196 int fhandle; /**< file descriptor */
197 off_t startoff; /**< starting offset of this file */
201 off_t exportsize; /**< size of the file we're exporting */
202 char *clientname; /**< peer */
203 char *exportname; /**< (processed) filename of the file we're exporting */
204 GArray *export; /**< array of FILE_INFO of exported files;
205 array size is always 1 unless we're
206 doing the multiple file option */
207 int net; /**< The actual client socket */
208 SERVER *server; /**< The server this client is getting data from */
209 char* difffilename; /**< filename of the copy-on-write file, if any */
210 int difffile; /**< filedescriptor of copyonwrite file. @todo
211 shouldn't this be an array too? (cfr export) Or
212 make -m and -c mutually exclusive */
213 u32 difffilelen; /**< number of pages in difffile */
214 u32 *difmap; /**< see comment on the global difmap for this one */
218 * Type of configuration file values
221 PARAM_INT, /**< This parameter is an integer */
222 PARAM_STRING, /**< This parameter is a string */
223 PARAM_BOOL, /**< This parameter is a boolean */
227 * Configuration file values
230 gchar *paramname; /**< Name of the parameter, as it appears in
232 gboolean required; /**< Whether this is a required (as opposed to
233 optional) parameter */
234 PARAM_TYPE ptype; /**< Type of the parameter. */
235 gpointer target; /**< Pointer to where the data of this
236 parameter should be written. If ptype is
237 PARAM_BOOL, the data is or'ed rather than
239 gint flagval; /**< Flag mask for this parameter in case ptype
244 * Check whether a client is allowed to connect. Works with an authorization
245 * file which contains one line per machine, no wildcards.
247 * @param opts The client who's trying to connect.
248 * @return 0 - authorization refused, 1 - OK
250 int authorized_client(CLIENT *opts) {
251 const char *ERRMSG="Invalid entry '%s' in authfile '%s', so, refusing all connections.";
256 struct in_addr client;
257 struct in_addr cltemp;
260 if ((f=fopen(opts->server->authname,"r"))==NULL) {
261 msg4(LOG_INFO,"Can't open authorization file %s (%s).",
262 opts->server->authname,strerror(errno)) ;
266 inet_aton(opts->clientname, &client);
267 while (fgets(line,LINELEN,f)!=NULL) {
268 if((tmp=index(line, '/'))) {
269 if(strlen(line)<=tmp-line) {
270 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
274 if(inet_aton(line,&addr)) {
275 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
278 len=strtol(tmp, NULL, 0);
279 addr.s_addr>>=32-len;
280 addr.s_addr<<=32-len;
281 memcpy(&cltemp,&client,sizeof(client));
282 cltemp.s_addr>>=32-len;
283 cltemp.s_addr<<=32-len;
284 if(addr.s_addr == cltemp.s_addr) {
288 if (strncmp(line,opts->clientname,strlen(opts->clientname))==0) {
298 * Read data from a file descriptor into a buffer
300 * @param f a file descriptor
301 * @param buf a buffer
302 * @param len the number of bytes to be read
304 inline void readit(int f, void *buf, size_t len) {
308 if ((res = read(f, buf, len)) <= 0)
309 err("Read failed: %m");
316 * Write data from a buffer into a filedescriptor
318 * @param f a file descriptor
319 * @param buf a buffer containing data
320 * @param len the number of bytes to be written
322 inline void writeit(int f, void *buf, size_t len) {
326 if ((res = write(f, buf, len)) <= 0)
327 err("Send failed: %m");
334 * Print out a message about how to use nbd-server. Split out to a separate
335 * function so that we can call it from multiple places
338 printf("This is nbd-server version " VERSION "\n");
339 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"
340 "\t-r|--read-only\t\tread only\n"
341 "\t-m|--multi-file\t\tmultiple file\n"
342 "\t-c|--copy-on-write\tcopy on write\n"
343 "\t-C|--config-file\tspecify an alternate configuration file\n"
344 "\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
345 "\t-a|--idle-time\t\tmaximum idle seconds; server terminates when\n\t\t\t\tidle time exceeded\n"
346 "\t-p|--pid-file\t\tspecify a filename to write our PID to\n"
347 "\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"
348 "\tif port is set to 0, stdin is used (for running from inetd)\n"
349 "\tif file_to_export contains '%%s', it is substituted with the IP\n"
350 "\t\taddress of the machine trying to connect\n"
351 "\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");
352 printf("Using configuration file %s\n", CFILE);
355 /* Dumps a config file section of the given SERVER*, and exits. */
356 void dump_section(SERVER* serve, gchar* section_header) {
357 printf("[%s]\n", section_header);
358 printf("\texportname = %s\n", serve->exportname);
359 printf("\tlistenaddr = %s\n", serve->listenaddr);
360 printf("\tport = %d\n", serve->port);
361 if(serve->flags & F_READONLY) {
362 printf("\treadonly = true\n");
364 if(serve->flags & F_MULTIFILE) {
365 printf("\tmultifile = true\n");
367 if(serve->flags & F_COPYONWRITE) {
368 printf("\tcopyonwrite = true\n");
370 if(serve->expected_size) {
371 printf("\tfilesize = %Ld\n", (long long int)serve->expected_size);
373 if(serve->authname) {
374 printf("\tauthfile = %s\n", serve->authname);
377 printf("\ttimeout = %d\n", serve->timeout);
383 * Parse the command line.
385 * @param argc the argc argument to main()
386 * @param argv the argv argument to main()
388 SERVER* cmdline(int argc, char *argv[]) {
392 struct option long_options[] = {
393 {"read-only", no_argument, NULL, 'r'},
394 {"multi-file", no_argument, NULL, 'm'},
395 {"copy-on-write", no_argument, NULL, 'c'},
396 {"authorize-file", required_argument, NULL, 'l'},
397 {"idle-time", required_argument, NULL, 'a'},
398 {"config-file", required_argument, NULL, 'C'},
399 {"pid-file", required_argument, NULL, 'p'},
400 {"output-config", required_argument, NULL, 'o'},
407 gboolean do_output=FALSE;
408 gchar* section_header="";
414 serve=g_new0(SERVER, 1);
415 serve->authname = g_strdup(default_authname);
416 serve->virtstyle=VIRT_IPLIT;
417 while((c=getopt_long(argc, argv, "-a:C:cl:mo:rp:", long_options, &i))>=0) {
420 /* non-option argument */
421 switch(nonspecial++) {
423 addr_port=g_strsplit(optarg, ":", 2);
425 serve->port=strtol(addr_port[1], NULL, 0);
426 serve->listenaddr=g_strdup(addr_port[0]);
428 serve->listenaddr=g_strdup("0.0.0.0");
429 serve->port=strtol(addr_port[0], NULL, 0);
431 g_strfreev(addr_port);
434 serve->exportname = g_strdup(optarg);
435 if(serve->exportname[0] != '/') {
436 fprintf(stderr, "E: The to be exported file needs to be an absolute filename!\n");
441 last=strlen(optarg)-1;
443 if (suffix == 'k' || suffix == 'K' ||
444 suffix == 'm' || suffix == 'M')
446 es = (off_t)atol(optarg);
454 serve->expected_size = es;
459 serve->flags |= F_READONLY;
462 serve->flags |= F_MULTIFILE;
466 section_header = g_strdup(optarg);
469 strncpy(pidftemplate, optarg, 256);
472 serve->flags |=F_COPYONWRITE;
475 g_free(config_file_pos);
476 config_file_pos=g_strdup(optarg);
479 g_free(serve->authname);
480 serve->authname=g_strdup(optarg);
483 serve->timeout=strtol(optarg, NULL, 0);
491 /* What's left: the port to export, the name of the to be exported
492 * file, and, optionally, the size of the file, in that order. */
499 g_critical("Need a complete configuration on the command line to output a config file section!");
502 dump_section(serve, section_header);
508 * Error codes for config file parsing
511 CFILE_NOTFOUND, /**< The configuration file is not found */
512 CFILE_MISSING_GENERIC, /**< The (required) group "generic" is missing */
513 CFILE_KEY_MISSING, /**< A (required) key is missing */
514 CFILE_VALUE_INVALID, /**< A value is syntactically invalid */
515 CFILE_VALUE_UNSUPPORTED,/**< A value is not supported in this build */
516 CFILE_PROGERR /**< Programmer error */
520 * Remove a SERVER from memory. Used from the hash table
522 void remove_server(gpointer s) {
526 g_free(server->exportname);
528 g_free(server->authname);
533 * Parse the config file.
535 * @param f the name of the config file
536 * @param e a GError. @see CFILE_ERRORS for what error values this function can
538 * @return a Array of SERVER* pointers, If the config file is empty or does not
539 * exist, returns an empty GHashTable; if the config file contains an
540 * error, returns NULL, and e is set appropriately
542 GArray* parse_cfile(gchar* f, GError** e) {
543 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
544 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
546 gchar *virtstyle=NULL;
548 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
549 { "port", TRUE, PARAM_INT, NULL, 0 },
550 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
551 { "timeout", FALSE, PARAM_INT, NULL, 0 },
552 { "filesize", FALSE, PARAM_INT, NULL, 0 },
553 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
554 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
555 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
556 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
557 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
558 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
559 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
560 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
561 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
562 { "cowname", FALSE, PARAM_STRING, NULL, 0 },
564 const int lp_size=sizeof(lp)/sizeof(PARAM);
566 { "user", FALSE, PARAM_STRING, &runuser, 0 },
567 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
570 int p_size=sizeof(gp)/sizeof(PARAM);
573 const char *err_msg=NULL;
581 errdomain = g_quark_from_string("parse_cfile");
582 cfile = g_key_file_new();
583 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
584 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
585 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
586 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file.");
587 g_key_file_free(cfile);
590 if(strcmp(g_key_file_get_start_group(cfile), "generic")) {
591 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
592 g_key_file_free(cfile);
595 groups = g_key_file_get_groups(cfile, NULL);
596 for(i=0;groups[i];i++) {
597 memset(&s, '\0', sizeof(SERVER));
598 lp[0].target=&(s.exportname);
599 lp[1].target=&(s.port);
600 lp[2].target=&(s.authname);
601 lp[3].target=&(s.timeout);
602 lp[4].target=&(s.expected_size);
603 lp[5].target=&(virtstyle);
604 lp[6].target=&(s.prerun);
605 lp[7].target=&(s.postrun);
606 lp[8].target=lp[9].target=lp[10].target=
607 lp[11].target=lp[12].target=&(s.flags);
608 lp[13].target=&(s.listenaddr);
609 lp[14].target=&(s.cowname);
611 s.cowname = "$F-$I-$P.diff";
613 /* After the [generic] group, start parsing exports */
618 for(j=0;j<p_size;j++) {
619 g_assert(p[j].target != NULL);
620 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
623 *((gint*)p[j].target) =
624 g_key_file_get_integer(cfile,
630 *((gchar**)p[j].target) =
631 g_key_file_get_string(cfile,
637 value = g_key_file_get_boolean(cfile,
639 p[j].paramname, &err);
642 *((gint*)p[j].target) |= p[j].flagval;
644 *((gint*)p[j].target) &= ~(p[j].flagval);
650 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
652 /* Ignore not-found error for optional values */
656 err_msg = MISSING_REQUIRED_ERROR;
659 err_msg = DEFAULT_ERROR;
661 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
662 g_array_free(retval, TRUE);
664 g_key_file_free(cfile);
669 if(!strncmp(virtstyle, "none", 4)) {
670 s.virtstyle=VIRT_NONE;
671 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
672 s.virtstyle=VIRT_IPLIT;
673 } else if(!strncmp(virtstyle, "iphash", 6)) {
674 s.virtstyle=VIRT_IPHASH;
675 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
676 s.virtstyle=VIRT_CIDR;
677 if(strlen(virtstyle)<10) {
678 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
679 g_array_free(retval, TRUE);
680 g_key_file_free(cfile);
683 s.cidrlen=strtol(virtstyle+8, NULL, 0);
685 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
686 g_array_free(retval, TRUE);
687 g_key_file_free(cfile);
691 s.virtstyle=VIRT_IPLIT;
693 /* Don't need to free this, it's not our string */
695 /* Don't append values for the [generic] group */
698 s.listenaddr = g_strdup("0.0.0.0");
700 g_array_append_val(retval, s);
703 if(s.flags & F_SDP) {
704 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
705 g_array_free(retval, TRUE);
706 g_key_file_free(cfile);
715 * Signal handler for SIGCHLD
716 * @param s the signal we're handling (must be SIGCHLD, or something
719 void sigchld_handler(int s) {
724 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
725 if(WIFEXITED(status)) {
726 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
728 i=g_hash_table_lookup(children, &pid);
730 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
732 DEBUG2("Removing %d from the list of children", pid);
733 g_hash_table_remove(children, &pid);
739 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
742 * @param value the value corresponding to the above key
743 * @param user_data a pointer which we always set to 1, so that we know what
746 void killchild(gpointer key, gpointer value, gpointer user_data) {
748 int *parent=user_data;
755 * Handle SIGTERM and dispatch it to our children
756 * @param s the signal we're handling (must be SIGTERM, or something
757 * is severely wrong).
759 void sigterm_handler(int s) {
762 g_hash_table_foreach(children, killchild, &parent);
772 * Detect the size of a file.
774 * @param fhandle An open filedescriptor
775 * @return the size of the file, or OFFT_MAX if detection was
778 off_t size_autodetect(int fhandle) {
780 unsigned long sectors;
781 struct stat stat_buf;
784 #ifdef HAVE_SYS_MOUNT_H
785 #ifdef HAVE_SYS_IOCTL_H
787 DEBUG("looking for export size with ioctl BLKGETSIZE\n");
788 if (!ioctl(fhandle, BLKGETSIZE, §ors) && sectors) {
789 es = (off_t)sectors * (off_t)512;
792 #endif /* BLKGETSIZE */
793 #endif /* HAVE_SYS_IOCTL_H */
794 #endif /* HAVE_SYS_MOUNT_H */
796 DEBUG("looking for fhandle size with fstat\n");
797 stat_buf.st_size = 0;
798 error = fstat(fhandle, &stat_buf);
800 if(stat_buf.st_size > 0)
801 return (off_t)stat_buf.st_size;
803 err("fstat failed: %m");
806 DEBUG("looking for fhandle size with lseek SEEK_END\n");
807 es = lseek(fhandle, (off_t)0, SEEK_END);
808 if (es > ((off_t)0)) {
811 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
814 err("Could not find size of exported block device: %m");
819 * Get the file handle and offset, given an export offset.
821 * @param export An array of export files
822 * @param a The offset to get corresponding file/offset for
823 * @param fhandle [out] File descriptor
824 * @param foffset [out] Offset into fhandle
825 * @param maxbytes [out] Tells how many bytes can be read/written
826 * from fhandle starting at foffset (0 if there is no limit)
827 * @return 0 on success, -1 on failure
829 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
830 /* Negative offset not allowed */
834 /* Binary search for last file with starting offset <= a */
837 int end = export->len - 1;
838 while( start <= end ) {
839 int mid = (start + end) / 2;
840 fi = g_array_index(export, FILE_INFO, mid);
841 if( fi.startoff < a ) {
843 } else if( fi.startoff > a ) {
851 /* end should never go negative, since first startoff is 0 and a >= 0 */
854 fi = g_array_index(export, FILE_INFO, end);
855 *fhandle = fi.fhandle;
856 *foffset = a - fi.startoff;
858 if( end+1 < export->len ) {
859 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
860 *maxbytes = fi_next.startoff - a;
867 * seek to a position in a file, with error handling.
868 * @param handle a filedescriptor
869 * @param a position to seek to
870 * @todo get rid of this; lastpoint is a global variable right now, but it
871 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
874 void myseek(int handle,off_t a) {
875 if (lseek(handle, a, SEEK_SET) < 0) {
876 err("Can not seek locally!\n");
881 * Write an amount of bytes at a given offset to the right file. This
882 * abstracts the write-side of the multiple file option.
884 * @param a The offset where the write should start
885 * @param buf The buffer to write from
886 * @param len The length of buf
887 * @param client The client we're serving for
888 * @return The number of bytes actually written, or -1 in case of an error
890 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
895 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
897 if(maxbytes && len > maxbytes)
900 DEBUG4("(WRITE to fd %d offset %Lu len %u), ", fhandle, foffset, len);
902 myseek(fhandle, foffset);
903 return write(fhandle, buf, len);
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 %Lu 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 %Lu.\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 %Lu 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 %Lu 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 %Lu.\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 %Lu 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 %Lu 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 if (client->server->timeout)
1118 alarm(client->server->timeout);
1119 readit(client->net, &request, sizeof(request));
1120 request.from = ntohll(request.from);
1121 request.type = ntohl(request.type);
1123 if (request.type==NBD_CMD_DISC) {
1124 msg2(LOG_INFO, "Disconnect request received.");
1125 if (client->server->flags & F_COPYONWRITE) {
1126 if (client->difmap) g_free(client->difmap) ;
1127 close(client->difffile);
1128 unlink(client->difffilename);
1129 free(client->difffilename);
1135 len = ntohl(request.len);
1137 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1138 err("Not enough magic.");
1139 if (len > BUFSIZE + sizeof(struct nbd_reply))
1140 err("Request too big!");
1142 printf("%s from %Lu (%Lu) len %d, ", request.type ? "WRITE" :
1143 "READ", (unsigned long long)request.from,
1144 (unsigned long long)request.from / 512, len);
1146 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1147 if ((request.from + len) > (OFFT_MAX)) {
1148 DEBUG("[Number too large!]");
1149 ERROR(client, reply, EINVAL);
1153 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1155 ERROR(client, reply, EINVAL);
1159 if (request.type==NBD_CMD_WRITE) {
1160 DEBUG("wr: net->buf, ");
1161 readit(client->net, buf, len);
1162 DEBUG("buf->exp, ");
1163 if ((client->server->flags & F_READONLY) ||
1164 (client->server->flags & F_AUTOREADONLY)) {
1165 DEBUG("[WRITE to READONLY!]");
1166 ERROR(client, reply, EPERM);
1169 if (expwrite(request.from, buf, len, client)) {
1170 DEBUG("Write failed: %m" );
1171 ERROR(client, reply, errno);
1174 SEND(client->net, reply);
1180 DEBUG("exp->buf, ");
1181 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1182 DEBUG("Read failed: %m");
1183 ERROR(client, reply, errno);
1187 DEBUG("buf->net, ");
1188 memcpy(buf, &reply, sizeof(struct nbd_reply));
1189 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1196 * Set up client export array, which is an array of FILE_INFO.
1197 * Also, split a single exportfile into multiple ones, if that was asked.
1198 * @param client information on the client which we want to setup export for
1200 void setupexport(CLIENT* client) {
1202 off_t laststartoff = 0, lastsize = 0;
1203 int multifile = (client->server->flags & F_MULTIFILE);
1205 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1207 /* If multi-file, open as many files as we can.
1208 * If not, open exactly one file.
1209 * Calculate file sizes as we go to get total size. */
1213 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1216 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1218 tmpname=g_strdup(client->exportname);
1220 DEBUG2( "Opening %s\n", tmpname );
1221 fi.fhandle = open(tmpname, mode);
1222 if(fi.fhandle == -1 && mode == O_RDWR) {
1223 /* Try again because maybe media was read-only */
1224 fi.fhandle = open(tmpname, O_RDONLY);
1225 if(fi.fhandle != -1) {
1226 /* Opening the base file in copyonwrite mode is
1228 if(!(client->server->flags & F_COPYONWRITE)) {
1229 client->server->flags |= F_AUTOREADONLY;
1230 client->server->flags |= F_READONLY;
1234 if(fi.fhandle == -1) {
1235 if(multifile && i>0)
1237 err("Could not open exported file: %m");
1239 fi.startoff = laststartoff + lastsize;
1240 g_array_append_val(client->export, fi);
1243 /* Starting offset and size of this file will be used to
1244 * calculate starting offset of next file */
1245 laststartoff = fi.startoff;
1246 lastsize = size_autodetect(fi.fhandle);
1252 /* Set export size to total calculated size */
1253 client->exportsize = laststartoff + lastsize;
1255 /* Export size may be overridden */
1256 if(client->server->expected_size) {
1257 /* desired size must be <= total calculated size */
1258 if(client->server->expected_size > client->exportsize) {
1259 err("Size of exported file is too big\n");
1262 client->exportsize = client->server->expected_size;
1265 msg3(LOG_INFO, "Size of exported file/device is %Lu", (unsigned long long)client->exportsize);
1267 msg3(LOG_INFO, "Total number of files: %d", i);
1271 int copyonwrite_prepare(CLIENT* client) {
1273 if ((client->difffilename = malloc(1024))==NULL)
1274 err("Failed to allocate string for diff file name");
1275 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1277 client->difffilename[1023]='\0';
1278 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1279 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1280 if (client->difffile<0) err("Could not create diff file (%m)") ;
1281 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1282 err("Could not allocate memory") ;
1283 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1289 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1292 * @param command the command to be ran. Read from the config file
1293 * @param file the file name we're about to export
1295 int do_run(gchar* command, gchar* file) {
1299 if(command && *command) {
1300 cmd = g_strdup_printf(command, file);
1308 * Serve a connection.
1310 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1311 * follow the road map.
1313 * @param client a connected client
1315 void serveconnection(CLIENT *client) {
1316 if(do_run(client->server->prerun, client->exportname)) {
1319 setupexport(client);
1321 if (client->server->flags & F_COPYONWRITE) {
1322 copyonwrite_prepare(client);
1325 setmysockopt(client->net);
1328 do_run(client->server->postrun, client->exportname);
1332 * Find the name of the file we have to serve. This will use g_strdup_printf
1333 * to put the IP address of the client inside a filename containing
1334 * "%s" (in the form as specified by the "virtstyle" option). That name
1335 * is then written to client->exportname.
1337 * @param net A socket connected to an nbd client
1338 * @param client information about the client. The IP address in human-readable
1339 * format will be written to a new char* buffer, the address of which will be
1340 * stored in client->clientname.
1342 void set_peername(int net, CLIENT *client) {
1343 struct sockaddr_in addrin;
1344 struct sockaddr_in netaddr;
1345 size_t addrinlen = sizeof( addrin );
1351 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1352 err("getsockname failed: %m");
1353 peername = g_strdup(inet_ntoa(addrin.sin_addr));
1354 switch(client->server->virtstyle) {
1356 client->exportname=g_strdup(client->server->exportname);
1359 for(i=0;i<strlen(peername);i++) {
1360 if(peername[i]=='.') {
1365 client->exportname=g_strdup_printf(client->server->exportname, peername);
1368 memcpy(&netaddr, &addrin, addrinlen);
1369 netaddr.sin_addr.s_addr>>=32-(client->server->cidrlen);
1370 netaddr.sin_addr.s_addr<<=32-(client->server->cidrlen);
1371 netname = inet_ntoa(netaddr.sin_addr);
1372 tmp=g_strdup_printf("%s/%s", netname, peername);
1373 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1377 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1378 peername, client->exportname);
1379 client->clientname=g_strdup(peername);
1385 * @param data a pointer to pid_t which should be freed
1387 void destroy_pid_t(gpointer data) {
1392 * Loop through the available servers, and serve them. Never returns.
1394 int serveloop(GArray* servers) {
1395 struct sockaddr_in addrin;
1396 socklen_t addrinlen=sizeof(addrin);
1405 * Set up the master fd_set. The set of descriptors we need
1406 * to select() for never changes anyway and it buys us a *lot*
1407 * of time to only build this once. However, if we ever choose
1408 * to not fork() for clients anymore, we may have to revisit
1413 for(i=0;i<servers->len;i++) {
1414 sock=(g_array_index(servers, SERVER, i)).socket;
1415 FD_SET(sock, &mset);
1416 max=sock>max?sock:max;
1423 memcpy(&rset, &mset, sizeof(fd_set));
1424 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1426 for(i=0;i<servers->len;i++) {
1427 serve=&(g_array_index(servers, SERVER, i));
1428 if(FD_ISSET(serve->socket, &rset)) {
1429 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1432 client = g_malloc(sizeof(CLIENT));
1433 client->server=serve;
1434 client->exportsize=OFFT_MAX;
1436 set_peername(net, client);
1437 if (!authorized_client(client)) {
1438 msg2(LOG_INFO,"Unauthorized client") ;
1442 msg2(LOG_INFO,"Authorized client") ;
1443 pid=g_malloc(sizeof(pid_t));
1445 if ((*pid=fork())<0) {
1446 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1450 if (*pid>0) { /* parent */
1452 g_hash_table_insert(children, pid, pid);
1456 g_hash_table_destroy(children);
1457 for(i=0;i<servers->len;i++) {
1458 serve=&g_array_index(servers, SERVER, i);
1459 close(serve->socket);
1461 /* FALSE does not free the
1462 actual data. This is required,
1463 because the client has a
1464 direct reference into that
1465 data, and otherwise we get a
1467 g_array_free(servers, FALSE);
1469 msg2(LOG_INFO,"Starting to serve");
1470 serveconnection(client);
1479 * Connect a server's socket.
1481 * @param serve the server we want to connect.
1483 void setup_serve(SERVER *serve) {
1484 struct sockaddr_in addrin;
1485 struct sigaction sa;
1486 int addrinlen = sizeof(addrin);
1497 if ((serve->flags) && F_SDP) {
1501 if ((serve->socket = socket(af, SOCK_STREAM, IPPROTO_TCP)) < 0)
1504 /* lose the pesky "Address already in use" error message */
1505 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1506 err("setsockopt SO_REUSEADDR");
1508 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1509 err("setsockopt SO_KEEPALIVE");
1512 /* make the listening socket non-blocking */
1513 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1514 err("fcntl F_GETFL");
1516 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1517 err("fcntl F_SETFL O_NONBLOCK");
1520 DEBUG("Waiting for connections... bind, ");
1521 addrin.sin_family = AF_INET;
1523 if(serve->flags & F_SDP) {
1524 addrin.sin_family = AF_INET_SDP;
1527 addrin.sin_port = htons(serve->port);
1528 if(!inet_aton(serve->listenaddr, &(addrin.sin_addr)))
1529 err("could not parse listen address");
1530 if (bind(serve->socket, (struct sockaddr *) &addrin, addrinlen) < 0)
1533 if (listen(serve->socket, 1) < 0)
1535 sa.sa_handler = sigchld_handler;
1536 sigemptyset(&sa.sa_mask);
1537 sa.sa_flags = SA_RESTART;
1538 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1539 err("sigaction: %m");
1540 sa.sa_handler = sigterm_handler;
1541 sigemptyset(&sa.sa_mask);
1542 sa.sa_flags = SA_RESTART;
1543 if(sigaction(SIGTERM, &sa, NULL) == -1)
1544 err("sigaction: %m");
1548 * Connect our servers.
1550 void setup_servers(GArray* servers) {
1553 for(i=0;i<servers->len;i++) {
1554 setup_serve(&(g_array_index(servers, SERVER, i)));
1556 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1560 * Go daemon (unless we specified at compile time that we didn't want this)
1561 * @param serve the first server of our configuration. If its port is zero,
1562 * then do not daemonize, because we're doing inetd then. This parameter
1563 * is only used to create a PID file of the form
1564 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1566 #if !defined(NODAEMON) && !defined(NOFORK)
1567 void daemonize(SERVER* serve) {
1570 if(serve && !(serve->port)) {
1576 if(!*pidftemplate) {
1578 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1580 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1583 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1584 pidf=fopen(pidfname, "w");
1586 fprintf(pidf,"%d\n", (int)getpid());
1590 fprintf(stderr, "Not fatal; continuing");
1594 #define daemonize(serve)
1595 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1598 * Everything beyond this point (in the file) is run in non-daemon mode.
1599 * The stuff above daemonize() isn't.
1602 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1604 void serve_err(SERVER* serve, const char* msg) {
1605 g_message("Export of %s on port %d failed:", serve->exportname,
1611 * Set up user-ID and/or group-ID
1613 void dousers(void) {
1617 gr=getgrnam(rungroup);
1619 g_message("Invalid group name: %s", rungroup);
1622 if(setgid(gr->gr_gid)<0) {
1623 g_message("Could not set GID: %s", strerror(errno));
1628 pw=getpwnam(runuser);
1630 g_message("Invalid user name: %s", runuser);
1633 if(setuid(pw->pw_uid)<0) {
1634 g_message("Could not set UID: %s", strerror(errno));
1641 * Main entry point...
1643 int main(int argc, char *argv[]) {
1648 if (sizeof( struct nbd_request )!=28) {
1649 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1650 exit(EXIT_FAILURE) ;
1653 memset(pidftemplate, '\0', 256);
1656 config_file_pos = g_strdup(CFILE);
1657 serve=cmdline(argc, argv);
1658 servers = parse_cfile(config_file_pos, &err);
1659 if(!servers || !servers->len) {
1660 g_warning("Could not parse config file: %s",
1661 err ? err->message : "Unknown error");
1664 g_array_append_val(servers, *serve);
1666 if (!(serve->port)) {
1669 /* You really should define ISSERVER if you're going to use
1670 * inetd mode, but if you don't, closing stdout and stderr
1671 * (which inetd had connected to the client socket) will let it
1675 open("/dev/null", O_WRONLY);
1676 open("/dev/null", O_WRONLY);
1678 client=g_malloc(sizeof(CLIENT));
1679 client->server=serve;
1681 client->exportsize=OFFT_MAX;
1682 set_peername(0,client);
1683 serveconnection(client);
1687 if((!serve) && (!servers||!servers->len)) {
1688 g_message("Nothing to do! Bye!");
1692 setup_servers(servers);