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 if(errno != EAGAIN) {
308 err("Read failed: %m");
318 * Write data from a buffer into a filedescriptor
320 * @param f a file descriptor
321 * @param buf a buffer containing data
322 * @param len the number of bytes to be written
324 inline void writeit(int f, void *buf, size_t len) {
328 if ((res = write(f, buf, len)) <= 0)
329 err("Send failed: %m");
336 * Print out a message about how to use nbd-server. Split out to a separate
337 * function so that we can call it from multiple places
340 printf("This is nbd-server version " VERSION "\n");
341 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"
342 "\t-r|--read-only\t\tread only\n"
343 "\t-m|--multi-file\t\tmultiple file\n"
344 "\t-c|--copy-on-write\tcopy on write\n"
345 "\t-C|--config-file\tspecify an alternate configuration file\n"
346 "\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
347 "\t-p|--pid-file\t\tspecify a filename to write our PID to\n"
348 "\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"
349 "\tif port is set to 0, stdin is used (for running from inetd)\n"
350 "\tif file_to_export contains '%%s', it is substituted with the IP\n"
351 "\t\taddress of the machine trying to connect\n"
352 "\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");
353 printf("Using configuration file %s\n", CFILE);
356 /* Dumps a config file section of the given SERVER*, and exits. */
357 void dump_section(SERVER* serve, gchar* section_header) {
358 printf("[%s]\n", section_header);
359 printf("\texportname = %s\n", serve->exportname);
360 printf("\tlistenaddr = %s\n", serve->listenaddr);
361 printf("\tport = %d\n", serve->port);
362 if(serve->flags & F_READONLY) {
363 printf("\treadonly = true\n");
365 if(serve->flags & F_MULTIFILE) {
366 printf("\tmultifile = true\n");
368 if(serve->flags & F_COPYONWRITE) {
369 printf("\tcopyonwrite = true\n");
371 if(serve->expected_size) {
372 printf("\tfilesize = %lld\n", (long long int)serve->expected_size);
374 if(serve->authname) {
375 printf("\tauthfile = %s\n", serve->authname);
381 * Parse the command line.
383 * @param argc the argc argument to main()
384 * @param argv the argv argument to main()
386 SERVER* cmdline(int argc, char *argv[]) {
390 struct option long_options[] = {
391 {"read-only", no_argument, NULL, 'r'},
392 {"multi-file", no_argument, NULL, 'm'},
393 {"copy-on-write", no_argument, NULL, 'c'},
394 {"authorize-file", required_argument, NULL, 'l'},
395 {"idle-time", required_argument, NULL, 'a'},
396 {"config-file", required_argument, NULL, 'C'},
397 {"pid-file", required_argument, NULL, 'p'},
398 {"output-config", required_argument, NULL, 'o'},
405 gboolean do_output=FALSE;
406 gchar* section_header="";
412 serve=g_new0(SERVER, 1);
413 serve->authname = g_strdup(default_authname);
414 serve->virtstyle=VIRT_IPLIT;
415 while((c=getopt_long(argc, argv, "-C:cl:mo:rp:", long_options, &i))>=0) {
418 /* non-option argument */
419 switch(nonspecial++) {
421 addr_port=g_strsplit(optarg, ":", 2);
423 serve->port=strtol(addr_port[1], NULL, 0);
424 serve->listenaddr=g_strdup(addr_port[0]);
426 serve->listenaddr=g_strdup("0.0.0.0");
427 serve->port=strtol(addr_port[0], NULL, 0);
429 g_strfreev(addr_port);
432 serve->exportname = g_strdup(optarg);
433 if(serve->exportname[0] != '/') {
434 fprintf(stderr, "E: The to be exported file needs to be an absolute filename!\n");
439 last=strlen(optarg)-1;
441 if (suffix == 'k' || suffix == 'K' ||
442 suffix == 'm' || suffix == 'M')
444 es = (off_t)atoll(optarg);
452 serve->expected_size = es;
457 serve->flags |= F_READONLY;
460 serve->flags |= F_MULTIFILE;
464 section_header = g_strdup(optarg);
467 strncpy(pidftemplate, optarg, 256);
470 serve->flags |=F_COPYONWRITE;
473 g_free(config_file_pos);
474 config_file_pos=g_strdup(optarg);
477 g_free(serve->authname);
478 serve->authname=g_strdup(optarg);
486 /* What's left: the port to export, the name of the to be exported
487 * file, and, optionally, the size of the file, in that order. */
494 g_critical("Need a complete configuration on the command line to output a config file section!");
497 dump_section(serve, section_header);
503 * Error codes for config file parsing
506 CFILE_NOTFOUND, /**< The configuration file is not found */
507 CFILE_MISSING_GENERIC, /**< The (required) group "generic" is missing */
508 CFILE_KEY_MISSING, /**< A (required) key is missing */
509 CFILE_VALUE_INVALID, /**< A value is syntactically invalid */
510 CFILE_VALUE_UNSUPPORTED,/**< A value is not supported in this build */
511 CFILE_PROGERR, /**< Programmer error */
512 CFILE_NO_EXPORTS /**< A config file was specified that does not
513 define any exports */
517 * Remove a SERVER from memory. Used from the hash table
519 void remove_server(gpointer s) {
523 g_free(server->exportname);
525 g_free(server->authname);
530 * Parse the config file.
532 * @param f the name of the config file
533 * @param e a GError. @see CFILE_ERRORS for what error values this function can
535 * @return a Array of SERVER* pointers, If the config file is empty or does not
536 * exist, returns an empty GHashTable; if the config file contains an
537 * error, returns NULL, and e is set appropriately
539 GArray* parse_cfile(gchar* f, GError** e) {
540 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
541 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
543 gchar *virtstyle=NULL;
545 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
546 { "port", TRUE, PARAM_INT, NULL, 0 },
547 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
548 { "filesize", FALSE, PARAM_INT, NULL, 0 },
549 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
550 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
551 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
552 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
553 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
554 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
555 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
556 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
557 { "sync", FALSE, PARAM_BOOL, NULL, F_SYNC },
558 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
560 const int lp_size=sizeof(lp)/sizeof(PARAM);
562 { "user", FALSE, PARAM_STRING, &runuser, 0 },
563 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
566 int p_size=sizeof(gp)/sizeof(PARAM);
569 const char *err_msg=NULL;
578 errdomain = g_quark_from_string("parse_cfile");
579 cfile = g_key_file_new();
580 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
581 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
582 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
583 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file %s.", f);
584 g_key_file_free(cfile);
587 startgroup = g_key_file_get_start_group(cfile);
588 if(!startgroup || strcmp(startgroup, "generic")) {
589 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
590 g_key_file_free(cfile);
593 groups = g_key_file_get_groups(cfile, NULL);
594 for(i=0;groups[i];i++) {
595 memset(&s, '\0', sizeof(SERVER));
596 lp[0].target=&(s.exportname);
597 lp[1].target=&(s.port);
598 lp[2].target=&(s.authname);
599 lp[3].target=&(s.expected_size);
600 lp[4].target=&(virtstyle);
601 lp[5].target=&(s.prerun);
602 lp[6].target=&(s.postrun);
603 lp[7].target=lp[8].target=lp[9].target=
604 lp[10].target=lp[11].target=
605 lp[12].target=&(s.flags);
606 lp[13].target=&(s.listenaddr);
608 /* After the [generic] group, start parsing exports */
613 for(j=0;j<p_size;j++) {
614 g_assert(p[j].target != NULL);
615 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
618 *((gint*)p[j].target) =
619 g_key_file_get_integer(cfile,
625 *((gchar**)p[j].target) =
626 g_key_file_get_string(cfile,
632 value = g_key_file_get_boolean(cfile,
634 p[j].paramname, &err);
637 *((gint*)p[j].target) |= p[j].flagval;
639 *((gint*)p[j].target) &= ~(p[j].flagval);
645 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
647 /* Ignore not-found error for optional values */
651 err_msg = MISSING_REQUIRED_ERROR;
654 err_msg = DEFAULT_ERROR;
656 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
657 g_array_free(retval, TRUE);
659 g_key_file_free(cfile);
664 if(!strncmp(virtstyle, "none", 4)) {
665 s.virtstyle=VIRT_NONE;
666 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
667 s.virtstyle=VIRT_IPLIT;
668 } else if(!strncmp(virtstyle, "iphash", 6)) {
669 s.virtstyle=VIRT_IPHASH;
670 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
671 s.virtstyle=VIRT_CIDR;
672 if(strlen(virtstyle)<10) {
673 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
674 g_array_free(retval, TRUE);
675 g_key_file_free(cfile);
678 s.cidrlen=strtol(virtstyle+8, NULL, 0);
680 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
681 g_array_free(retval, TRUE);
682 g_key_file_free(cfile);
686 s.virtstyle=VIRT_IPLIT;
688 /* Don't need to free this, it's not our string */
690 /* Don't append values for the [generic] group */
693 s.listenaddr = g_strdup("0.0.0.0");
695 g_array_append_val(retval, s);
698 if(s.flags & F_SDP) {
699 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
700 g_array_free(retval, TRUE);
701 g_key_file_free(cfile);
707 g_set_error(e, errdomain, CFILE_NO_EXPORTS, "The config file does not specify any exports");
709 g_key_file_free(cfile);
714 * Signal handler for SIGCHLD
715 * @param s the signal we're handling (must be SIGCHLD, or something
718 void sigchld_handler(int s) {
723 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
724 if(WIFEXITED(status)) {
725 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
727 i=g_hash_table_lookup(children, &pid);
729 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
731 DEBUG2("Removing %d from the list of children", pid);
732 g_hash_table_remove(children, &pid);
738 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
741 * @param value the value corresponding to the above key
742 * @param user_data a pointer which we always set to 1, so that we know what
745 void killchild(gpointer key, gpointer value, gpointer user_data) {
747 int *parent=user_data;
754 * Handle SIGTERM and dispatch it to our children
755 * @param s the signal we're handling (must be SIGTERM, or something
756 * is severely wrong).
758 void sigterm_handler(int s) {
761 g_hash_table_foreach(children, killchild, &parent);
771 * Detect the size of a file.
773 * @param fhandle An open filedescriptor
774 * @return the size of the file, or OFFT_MAX if detection was
777 off_t size_autodetect(int fhandle) {
780 struct stat stat_buf;
783 #ifdef HAVE_SYS_MOUNT_H
784 #ifdef HAVE_SYS_IOCTL_H
786 DEBUG("looking for export size with ioctl BLKGETSIZE64\n");
787 if (!ioctl(fhandle, BLKGETSIZE64, bytes) && bytes) {
790 #endif /* BLKGETSIZE64 */
791 #endif /* HAVE_SYS_IOCTL_H */
792 #endif /* HAVE_SYS_MOUNT_H */
794 DEBUG("looking for fhandle size with fstat\n");
795 stat_buf.st_size = 0;
796 error = fstat(fhandle, &stat_buf);
798 if(stat_buf.st_size > 0)
799 return (off_t)stat_buf.st_size;
801 err("fstat failed: %m");
804 DEBUG("looking for fhandle size with lseek SEEK_END\n");
805 es = lseek(fhandle, (off_t)0, SEEK_END);
806 if (es > ((off_t)0)) {
809 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
812 err("Could not find size of exported block device: %m");
817 * Get the file handle and offset, given an export offset.
819 * @param export An array of export files
820 * @param a The offset to get corresponding file/offset for
821 * @param fhandle [out] File descriptor
822 * @param foffset [out] Offset into fhandle
823 * @param maxbytes [out] Tells how many bytes can be read/written
824 * from fhandle starting at foffset (0 if there is no limit)
825 * @return 0 on success, -1 on failure
827 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
828 /* Negative offset not allowed */
832 /* Binary search for last file with starting offset <= a */
835 int end = export->len - 1;
836 while( start <= end ) {
837 int mid = (start + end) / 2;
838 fi = g_array_index(export, FILE_INFO, mid);
839 if( fi.startoff < a ) {
841 } else if( fi.startoff > a ) {
849 /* end should never go negative, since first startoff is 0 and a >= 0 */
852 fi = g_array_index(export, FILE_INFO, end);
853 *fhandle = fi.fhandle;
854 *foffset = a - fi.startoff;
856 if( end+1 < export->len ) {
857 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
858 *maxbytes = fi_next.startoff - a;
865 * seek to a position in a file, with error handling.
866 * @param handle a filedescriptor
867 * @param a position to seek to
868 * @todo get rid of this; lastpoint is a global variable right now, but it
869 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
872 void myseek(int handle,off_t a) {
873 if (lseek(handle, a, SEEK_SET) < 0) {
874 err("Can not seek locally!\n");
879 * Write an amount of bytes at a given offset to the right file. This
880 * abstracts the write-side of the multiple file option.
882 * @param a The offset where the write should start
883 * @param buf The buffer to write from
884 * @param len The length of buf
885 * @param client The client we're serving for
886 * @return The number of bytes actually written, or -1 in case of an error
888 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
894 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
896 if(maxbytes && len > maxbytes)
899 DEBUG4("(WRITE to fd %d offset %llu len %u), ", fhandle, foffset, len);
901 myseek(fhandle, foffset);
902 retval = write(fhandle, buf, len);
903 if(client->server->flags & F_SYNC) {
910 * Call rawexpwrite repeatedly until all data has been written.
911 * @return 0 on success, nonzero on failure
913 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
916 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
921 return (ret < 0 || len != 0);
925 * Read an amount of bytes at a given offset from the right file. This
926 * abstracts the read-side of the multiple files option.
928 * @param a The offset where the read should start
929 * @param buf A buffer to read into
930 * @param len The size of buf
931 * @param client The client we're serving for
932 * @return The number of bytes actually read, or -1 in case of an
935 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
940 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
942 if(maxbytes && len > maxbytes)
945 DEBUG4("(READ from fd %d offset %llu len %u), ", fhandle, foffset, len);
947 myseek(fhandle, foffset);
948 return read(fhandle, buf, len);
952 * Call rawexpread repeatedly until all data has been read.
953 * @return 0 on success, nonzero on failure
955 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
958 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
963 return (ret < 0 || len != 0);
967 * Read an amount of bytes at a given offset from the right file. This
968 * abstracts the read-side of the copyonwrite stuff, and calls
969 * rawexpread() with the right parameters to do the actual work.
970 * @param a The offset where the read should start
971 * @param buf A buffer to read into
972 * @param len The size of buf
973 * @param client The client we're going to read for
974 * @return 0 on success, nonzero on failure
976 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
978 off_t mapcnt, mapl, maph, pagestart;
980 if (!(client->server->flags & F_COPYONWRITE))
981 return(rawexpread_fully(a, buf, len, client));
982 DEBUG3("Asked to read %d bytes at %llu.\n", len, (unsigned long long)a);
984 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
986 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
987 pagestart=mapcnt*DIFFPAGESIZE;
989 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
990 len : (size_t)DIFFPAGESIZE-offset;
991 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
992 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
993 (unsigned long)(client->difmap[mapcnt]));
994 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
995 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
996 } else { /* the block is not there */
997 DEBUG2("Page %llu is not here, we read the original one\n",
998 (unsigned long long)mapcnt);
999 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
1001 len-=rdlen; a+=rdlen; buf+=rdlen;
1007 * Write an amount of bytes at a given offset to the right file. This
1008 * abstracts the write-side of the copyonwrite option, and calls
1009 * rawexpwrite() with the right parameters to do the actual work.
1011 * @param a The offset where the write should start
1012 * @param buf The buffer to write from
1013 * @param len The length of buf
1014 * @param client The client we're going to write for.
1015 * @return 0 on success, nonzero on failure
1017 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1018 char pagebuf[DIFFPAGESIZE];
1019 off_t mapcnt,mapl,maph;
1024 if (!(client->server->flags & F_COPYONWRITE))
1025 return(rawexpwrite_fully(a, buf, len, client));
1026 DEBUG3("Asked to write %d bytes at %llu.\n", len, (unsigned long long)a);
1028 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1030 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1031 pagestart=mapcnt*DIFFPAGESIZE ;
1032 offset=a-pagestart ;
1033 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1034 len : (size_t)DIFFPAGESIZE-offset;
1036 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1037 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1038 (unsigned long)(client->difmap[mapcnt])) ;
1039 myseek(client->difffile,
1040 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1041 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1042 } else { /* the block is not there */
1043 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1044 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1045 DEBUG3("Page %llu is not here, we put it at %lu\n",
1046 (unsigned long long)mapcnt,
1047 (unsigned long)(client->difmap[mapcnt]));
1048 rdlen=DIFFPAGESIZE ;
1049 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1051 memcpy(pagebuf+offset,buf,wrlen) ;
1052 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1056 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1062 * Do the initial negotiation.
1064 * @param client The client we're negotiating with.
1066 void negotiate(CLIENT *client) {
1069 u32 flags = NBD_FLAG_HAS_FLAGS;
1071 memset(zeros, '\0', sizeof(zeros));
1072 if (write(client->net, INIT_PASSWD, 8) < 0)
1073 err("Negotiation failed: %m");
1074 cliserv_magic = htonll(cliserv_magic);
1075 if (write(client->net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
1076 err("Negotiation failed: %m");
1077 size_host = htonll((u64)(client->exportsize));
1078 if (write(client->net, &size_host, 8) < 0)
1079 err("Negotiation failed: %m");
1080 if (client->server->flags & F_READONLY)
1081 flags |= NBD_FLAG_READ_ONLY;
1082 flags = htonl(flags);
1083 if (write(client->net, &flags, 4) < 0)
1084 err("Negotiation failed: %m");
1085 if (write(client->net, zeros, 124) < 0)
1086 err("Negotiation failed: %m");
1089 /** sending macro. */
1090 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1092 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1094 * Serve a file to a single client.
1096 * @todo This beast needs to be split up in many tiny little manageable
1097 * pieces. Preferably with a chainsaw.
1099 * @param client The client we're going to serve to.
1100 * @return when the client disconnects
1102 int mainloop(CLIENT *client) {
1103 struct nbd_request request;
1104 struct nbd_reply reply;
1105 gboolean go_on=TRUE;
1110 DEBUG("Entering request loop!\n");
1111 reply.magic = htonl(NBD_REPLY_MAGIC);
1120 readit(client->net, &request, sizeof(request));
1121 request.from = ntohll(request.from);
1122 request.type = ntohl(request.type);
1124 if (request.type==NBD_CMD_DISC) {
1125 msg2(LOG_INFO, "Disconnect request received.");
1126 if (client->server->flags & F_COPYONWRITE) {
1127 if (client->difmap) g_free(client->difmap) ;
1128 close(client->difffile);
1129 unlink(client->difffilename);
1130 free(client->difffilename);
1136 len = ntohl(request.len);
1138 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1139 err("Not enough magic.");
1140 if (len > BUFSIZE + sizeof(struct nbd_reply))
1141 err("Request too big!");
1143 printf("%s from %llu (%llu) len %d, ", request.type ? "WRITE" :
1144 "READ", (unsigned long long)request.from,
1145 (unsigned long long)request.from / 512, len);
1147 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1148 if ((request.from + len) > (OFFT_MAX)) {
1149 DEBUG("[Number too large!]");
1150 ERROR(client, reply, EINVAL);
1154 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1156 ERROR(client, reply, EINVAL);
1160 if (request.type==NBD_CMD_WRITE) {
1161 DEBUG("wr: net->buf, ");
1162 readit(client->net, buf, len);
1163 DEBUG("buf->exp, ");
1164 if ((client->server->flags & F_READONLY) ||
1165 (client->server->flags & F_AUTOREADONLY)) {
1166 DEBUG("[WRITE to READONLY!]");
1167 ERROR(client, reply, EPERM);
1170 if (expwrite(request.from, buf, len, client)) {
1171 DEBUG("Write failed: %m" );
1172 ERROR(client, reply, errno);
1175 SEND(client->net, reply);
1181 DEBUG("exp->buf, ");
1182 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1183 DEBUG("Read failed: %m");
1184 ERROR(client, reply, errno);
1188 DEBUG("buf->net, ");
1189 memcpy(buf, &reply, sizeof(struct nbd_reply));
1190 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1197 * Set up client export array, which is an array of FILE_INFO.
1198 * Also, split a single exportfile into multiple ones, if that was asked.
1199 * @param client information on the client which we want to setup export for
1201 void setupexport(CLIENT* client) {
1203 off_t laststartoff = 0, lastsize = 0;
1204 int multifile = (client->server->flags & F_MULTIFILE);
1206 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1208 /* If multi-file, open as many files as we can.
1209 * If not, open exactly one file.
1210 * Calculate file sizes as we go to get total size. */
1214 gchar* error_string;
1215 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1218 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1220 tmpname=g_strdup(client->exportname);
1222 DEBUG2( "Opening %s\n", tmpname );
1223 fi.fhandle = open(tmpname, mode);
1224 if(fi.fhandle == -1 && mode == O_RDWR) {
1225 /* Try again because maybe media was read-only */
1226 fi.fhandle = open(tmpname, O_RDONLY);
1227 if(fi.fhandle != -1) {
1228 /* Opening the base file in copyonwrite mode is
1230 if(!(client->server->flags & F_COPYONWRITE)) {
1231 client->server->flags |= F_AUTOREADONLY;
1232 client->server->flags |= F_READONLY;
1236 if(fi.fhandle == -1) {
1237 if(multifile && i>0)
1239 error_string=g_strdup_printf(
1240 "Could not open exported file %s: %%m",
1244 fi.startoff = laststartoff + lastsize;
1245 g_array_append_val(client->export, fi);
1248 /* Starting offset and size of this file will be used to
1249 * calculate starting offset of next file */
1250 laststartoff = fi.startoff;
1251 lastsize = size_autodetect(fi.fhandle);
1257 /* Set export size to total calculated size */
1258 client->exportsize = laststartoff + lastsize;
1260 /* Export size may be overridden */
1261 if(client->server->expected_size) {
1262 /* desired size must be <= total calculated size */
1263 if(client->server->expected_size > client->exportsize) {
1264 err("Size of exported file is too big\n");
1267 client->exportsize = client->server->expected_size;
1270 msg3(LOG_INFO, "Size of exported file/device is %llu", (unsigned long long)client->exportsize);
1272 msg3(LOG_INFO, "Total number of files: %d", i);
1276 int copyonwrite_prepare(CLIENT* client) {
1278 if ((client->difffilename = malloc(1024))==NULL)
1279 err("Failed to allocate string for diff file name");
1280 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1282 client->difffilename[1023]='\0';
1283 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1284 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1285 if (client->difffile<0) err("Could not create diff file (%m)") ;
1286 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1287 err("Could not allocate memory") ;
1288 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1294 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1297 * @param command the command to be ran. Read from the config file
1298 * @param file the file name we're about to export
1300 int do_run(gchar* command, gchar* file) {
1304 if(command && *command) {
1305 cmd = g_strdup_printf(command, file);
1313 * Serve a connection.
1315 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1316 * follow the road map.
1318 * @param client a connected client
1320 void serveconnection(CLIENT *client) {
1321 if(do_run(client->server->prerun, client->exportname)) {
1324 setupexport(client);
1326 if (client->server->flags & F_COPYONWRITE) {
1327 copyonwrite_prepare(client);
1330 setmysockopt(client->net);
1333 do_run(client->server->postrun, client->exportname);
1337 * Find the name of the file we have to serve. This will use g_strdup_printf
1338 * to put the IP address of the client inside a filename containing
1339 * "%s" (in the form as specified by the "virtstyle" option). That name
1340 * is then written to client->exportname.
1342 * @param net A socket connected to an nbd client
1343 * @param client information about the client. The IP address in human-readable
1344 * format will be written to a new char* buffer, the address of which will be
1345 * stored in client->clientname.
1347 void set_peername(int net, CLIENT *client) {
1348 struct sockaddr_in addrin;
1349 struct sockaddr_in netaddr;
1350 size_t addrinlen = sizeof( addrin );
1356 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1357 err("getsockname failed: %m");
1358 peername = g_strdup(inet_ntoa(addrin.sin_addr));
1359 switch(client->server->virtstyle) {
1361 client->exportname=g_strdup(client->server->exportname);
1364 for(i=0;i<strlen(peername);i++) {
1365 if(peername[i]=='.') {
1370 client->exportname=g_strdup_printf(client->server->exportname, peername);
1373 memcpy(&netaddr, &addrin, addrinlen);
1374 netaddr.sin_addr.s_addr>>=32-(client->server->cidrlen);
1375 netaddr.sin_addr.s_addr<<=32-(client->server->cidrlen);
1376 netname = inet_ntoa(netaddr.sin_addr);
1377 tmp=g_strdup_printf("%s/%s", netname, peername);
1378 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1382 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1383 peername, client->exportname);
1384 client->clientname=g_strdup(peername);
1390 * @param data a pointer to pid_t which should be freed
1392 void destroy_pid_t(gpointer data) {
1397 * Loop through the available servers, and serve them. Never returns.
1399 int serveloop(GArray* servers) {
1400 struct sockaddr_in addrin;
1401 socklen_t addrinlen=sizeof(addrin);
1410 * Set up the master fd_set. The set of descriptors we need
1411 * to select() for never changes anyway and it buys us a *lot*
1412 * of time to only build this once. However, if we ever choose
1413 * to not fork() for clients anymore, we may have to revisit
1418 for(i=0;i<servers->len;i++) {
1419 sock=(g_array_index(servers, SERVER, i)).socket;
1420 FD_SET(sock, &mset);
1421 max=sock>max?sock:max;
1428 memcpy(&rset, &mset, sizeof(fd_set));
1429 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1431 for(i=0;i<servers->len;i++) {
1432 serve=&(g_array_index(servers, SERVER, i));
1433 if(FD_ISSET(serve->socket, &rset)) {
1435 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1438 if((sock_flags = fcntl(net, F_GETFL, 0))==-1) {
1439 err("fcntl F_GETFL");
1441 if(fcntl(net, F_SETFL, sock_flags &~O_NONBLOCK)==-1) {
1442 err("fcntl F_SETFL ~O_NONBLOCK");
1444 client = g_malloc(sizeof(CLIENT));
1445 client->server=serve;
1446 client->exportsize=OFFT_MAX;
1448 set_peername(net, client);
1449 if (!authorized_client(client)) {
1450 msg2(LOG_INFO,"Unauthorized client") ;
1454 msg2(LOG_INFO,"Authorized client") ;
1455 pid=g_malloc(sizeof(pid_t));
1457 if ((*pid=fork())<0) {
1458 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1462 if (*pid>0) { /* parent */
1464 g_hash_table_insert(children, pid, pid);
1468 g_hash_table_destroy(children);
1469 for(i=0;i<servers->len;i++) {
1470 serve=&g_array_index(servers, SERVER, i);
1471 close(serve->socket);
1473 /* FALSE does not free the
1474 actual data. This is required,
1475 because the client has a
1476 direct reference into that
1477 data, and otherwise we get a
1479 g_array_free(servers, FALSE);
1481 msg2(LOG_INFO,"Starting to serve");
1482 serveconnection(client);
1491 * Connect a server's socket.
1493 * @param serve the server we want to connect.
1495 void setup_serve(SERVER *serve) {
1496 struct sockaddr_in addrin;
1497 struct sigaction sa;
1498 int addrinlen = sizeof(addrin);
1509 if ((serve->flags) && F_SDP) {
1513 if ((serve->socket = socket(af, SOCK_STREAM, IPPROTO_TCP)) < 0)
1516 /* lose the pesky "Address already in use" error message */
1517 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1518 err("setsockopt SO_REUSEADDR");
1520 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1521 err("setsockopt SO_KEEPALIVE");
1524 /* make the listening socket non-blocking */
1525 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1526 err("fcntl F_GETFL");
1528 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1529 err("fcntl F_SETFL O_NONBLOCK");
1532 DEBUG("Waiting for connections... bind, ");
1533 addrin.sin_family = AF_INET;
1535 if(serve->flags & F_SDP) {
1536 addrin.sin_family = AF_INET_SDP;
1539 addrin.sin_port = htons(serve->port);
1540 if(!inet_aton(serve->listenaddr, &(addrin.sin_addr)))
1541 err("could not parse listen address");
1542 if (bind(serve->socket, (struct sockaddr *) &addrin, addrinlen) < 0)
1545 if (listen(serve->socket, 1) < 0)
1547 sa.sa_handler = sigchld_handler;
1548 sigemptyset(&sa.sa_mask);
1549 sa.sa_flags = SA_RESTART;
1550 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1551 err("sigaction: %m");
1552 sa.sa_handler = sigterm_handler;
1553 sigemptyset(&sa.sa_mask);
1554 sa.sa_flags = SA_RESTART;
1555 if(sigaction(SIGTERM, &sa, NULL) == -1)
1556 err("sigaction: %m");
1560 * Connect our servers.
1562 void setup_servers(GArray* servers) {
1565 for(i=0;i<servers->len;i++) {
1566 setup_serve(&(g_array_index(servers, SERVER, i)));
1568 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1572 * Go daemon (unless we specified at compile time that we didn't want this)
1573 * @param serve the first server of our configuration. If its port is zero,
1574 * then do not daemonize, because we're doing inetd then. This parameter
1575 * is only used to create a PID file of the form
1576 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1578 #if !defined(NODAEMON) && !defined(NOFORK)
1579 void daemonize(SERVER* serve) {
1582 if(serve && !(serve->port)) {
1588 if(!*pidftemplate) {
1590 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1592 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1595 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1596 pidf=fopen(pidfname, "w");
1598 fprintf(pidf,"%d\n", (int)getpid());
1602 fprintf(stderr, "Not fatal; continuing");
1606 #define daemonize(serve)
1607 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1610 * Everything beyond this point (in the file) is run in non-daemon mode.
1611 * The stuff above daemonize() isn't.
1614 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1616 void serve_err(SERVER* serve, const char* msg) {
1617 g_message("Export of %s on port %d failed:", serve->exportname,
1623 * Set up user-ID and/or group-ID
1625 void dousers(void) {
1630 gr=getgrnam(rungroup);
1632 str = g_strdup_printf("Invalid group name: %s", rungroup);
1635 if(setgid(gr->gr_gid)<0) {
1636 err("Could not set GID: %m");
1640 pw=getpwnam(runuser);
1642 str = g_strdup_printf("Invalid user name: %s", runuser);
1645 if(setuid(pw->pw_uid)<0) {
1646 err("Could not set UID: %m");
1652 void glib_message_syslog_redirect(const gchar *log_domain,
1653 GLogLevelFlags log_level,
1654 const gchar *message,
1657 int level=LOG_DEBUG;
1661 case G_LOG_FLAG_FATAL:
1662 case G_LOG_LEVEL_CRITICAL:
1663 case G_LOG_LEVEL_ERROR:
1666 case G_LOG_LEVEL_WARNING:
1669 case G_LOG_LEVEL_MESSAGE:
1670 case G_LOG_LEVEL_INFO:
1673 case G_LOG_LEVEL_DEBUG:
1676 syslog(level, message);
1681 * Main entry point...
1683 int main(int argc, char *argv[]) {
1688 if (sizeof( struct nbd_request )!=28) {
1689 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1690 exit(EXIT_FAILURE) ;
1693 memset(pidftemplate, '\0', 256);
1696 config_file_pos = g_strdup(CFILE);
1697 serve=cmdline(argc, argv);
1698 servers = parse_cfile(config_file_pos, &err);
1701 g_array_append_val(servers, *serve);
1703 if (!(serve->port)) {
1706 /* You really should define ISSERVER if you're going to use
1707 * inetd mode, but if you don't, closing stdout and stderr
1708 * (which inetd had connected to the client socket) will let it
1712 open("/dev/null", O_WRONLY);
1713 open("/dev/null", O_WRONLY);
1714 g_log_set_default_handler( glib_message_syslog_redirect, NULL );
1716 client=g_malloc(sizeof(CLIENT));
1717 client->server=serve;
1719 client->exportsize=OFFT_MAX;
1720 set_peername(0,client);
1721 serveconnection(client);
1726 if(!servers || !servers->len) {
1727 g_warning("Could not parse config file: %s",
1728 err ? err->message : "Unknown error");
1731 if((!serve) && (!servers||!servers->len)) {
1732 g_message("Nothing to do! Bye!");
1736 setup_servers(servers);