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
52 * 16/03/2010 - Add IPv6 support.
53 * Kitt Tientanopajai <kitt@kitty.in.th>
54 * Neutron Soutmun <neo.neutron@gmail.com>
55 * Suriya Soutmun <darksolar@gmail.com>
58 /* Includes LFS defines, which defines behaviours of some of the following
59 * headers, so must come before those */
62 #include <sys/types.h>
63 #include <sys/socket.h>
65 #include <sys/select.h> /* select */
66 #include <sys/wait.h> /* wait */
67 #ifdef HAVE_SYS_IOCTL_H
68 #include <sys/ioctl.h>
70 #include <sys/param.h>
71 #ifdef HAVE_SYS_MOUNT_H
72 #include <sys/mount.h> /* For BLKGETSIZE */
74 #include <signal.h> /* sigaction */
76 #include <netinet/tcp.h>
77 #include <netinet/in.h>
85 #include <arpa/inet.h>
95 /* used in cliserv.h, so must come first */
96 #define MY_NAME "nbd_server"
99 /** Default position of the config file */
101 #define SYSCONFDIR "/etc"
103 #define CFILE SYSCONFDIR "/nbd-server/config"
105 /** Where our config file actually is */
106 gchar* config_file_pos;
108 /** What user we're running as */
110 /** What group we're running as */
111 gchar* rungroup=NULL;
113 /** Logging macros, now nothing goes to syslog unless you say ISSERVER */
115 #define msg2(a,b) syslog(a,b)
116 #define msg3(a,b,c) syslog(a,b,c)
117 #define msg4(a,b,c,d) syslog(a,b,c,d)
119 #define msg2(a,b) g_message(b)
120 #define msg3(a,b,c) g_message(b,c)
121 #define msg4(a,b,c,d) g_message(b,c,d)
124 /* Debugging macros */
127 #define DEBUG( a ) printf( a )
128 #define DEBUG2( a,b ) printf( a,b )
129 #define DEBUG3( a,b,c ) printf( a,b,c )
130 #define DEBUG4( a,b,c,d ) printf( a,b,c,d )
133 #define DEBUG2( a,b )
134 #define DEBUG3( a,b,c )
135 #define DEBUG4( a,b,c,d )
137 #ifndef PACKAGE_VERSION
138 #define PACKAGE_VERSION ""
141 * The highest value a variable of type off_t can reach. This is a signed
142 * integer, so set all bits except for the leftmost one.
144 #define OFFT_MAX ~((off_t)1<<(sizeof(off_t)*8-1))
145 #define LINELEN 256 /**< Size of static buffer used to read the
146 authorization file (yuck) */
147 #define BUFSIZE (1024*1024) /**< Size of buffer that can hold requests */
148 #define DIFFPAGESIZE 4096 /**< diff file uses those chunks */
149 #define F_READONLY 1 /**< flag to tell us a file is readonly */
150 #define F_MULTIFILE 2 /**< flag to tell us a file is exported using -m */
151 #define F_COPYONWRITE 4 /**< flag to tell us a file is exported using
153 #define F_AUTOREADONLY 8 /**< flag to tell us a file is set to autoreadonly */
154 #define F_SPARSE 16 /**< flag to tell us copyronwrite should use a sparse file */
155 #define F_SDP 32 /**< flag to tell us the export should be done using the Socket Direct Protocol for RDMA */
156 #define F_SYNC 64 /**< Whether to fsync() after a write */
157 GHashTable *children;
158 char pidfname[256]; /**< name of our PID file */
159 char pidftemplate[256]; /**< template to be used for the filename of the PID file */
160 char default_authname[] = SYSCONFDIR "/nbd-server/allow"; /**< default name of allow file */
163 * Types of virtuatlization
166 VIRT_NONE=0, /**< No virtualization */
167 VIRT_IPLIT, /**< Literal IP address as part of the filename */
168 VIRT_IPHASH, /**< Replacing all dots in an ip address by a / before
169 doing the same as in IPLIT */
170 VIRT_CIDR, /**< Every subnet in its own directory */
174 * Variables associated with a server.
177 gchar* exportname; /**< (unprocessed) filename of the file we're exporting */
178 off_t expected_size; /**< size of the exported file as it was told to
179 us through configuration */
180 gchar* listenaddr; /**< The IP address we're listening on */
181 unsigned int port; /**< port we're exporting this file at */
182 char* authname; /**< filename of the authorization file */
183 int flags; /**< flags associated with this exported file */
184 int socket; /**< The socket of this server. */
185 int socket_family; /**< family of the socket */
186 VIRT_STYLE virtstyle;/**< The style of virtualization, if any */
187 uint8_t cidrlen; /**< The length of the mask when we use
188 CIDR-style virtualization */
189 gchar* prerun; /**< command to be ran after connecting a client,
190 but before starting to serve */
191 gchar* postrun; /**< command that will be ran after the client
196 * Variables associated with a client socket.
199 int fhandle; /**< file descriptor */
200 off_t startoff; /**< starting offset of this file */
204 off_t exportsize; /**< size of the file we're exporting */
205 char *clientname; /**< peer */
206 char *exportname; /**< (processed) filename of the file we're exporting */
207 GArray *export; /**< array of FILE_INFO of exported files;
208 array size is always 1 unless we're
209 doing the multiple file option */
210 int net; /**< The actual client socket */
211 SERVER *server; /**< The server this client is getting data from */
212 char* difffilename; /**< filename of the copy-on-write file, if any */
213 int difffile; /**< filedescriptor of copyonwrite file. @todo
214 shouldn't this be an array too? (cfr export) Or
215 make -m and -c mutually exclusive */
216 u32 difffilelen; /**< number of pages in difffile */
217 u32 *difmap; /**< see comment on the global difmap for this one */
221 * Type of configuration file values
224 PARAM_INT, /**< This parameter is an integer */
225 PARAM_STRING, /**< This parameter is a string */
226 PARAM_BOOL, /**< This parameter is a boolean */
230 * Configuration file values
233 gchar *paramname; /**< Name of the parameter, as it appears in
235 gboolean required; /**< Whether this is a required (as opposed to
236 optional) parameter */
237 PARAM_TYPE ptype; /**< Type of the parameter. */
238 gpointer target; /**< Pointer to where the data of this
239 parameter should be written. If ptype is
240 PARAM_BOOL, the data is or'ed rather than
242 gint flagval; /**< Flag mask for this parameter in case ptype
247 * Check whether a client is allowed to connect. Works with an authorization
248 * file which contains one line per machine, no wildcards.
250 * @param opts The client who's trying to connect.
251 * @return 0 - authorization refused, 1 - OK
253 int authorized_client(CLIENT *opts) {
254 const char *ERRMSG="Invalid entry '%s' in authfile '%s', so, refusing all connections.";
259 struct in_addr client;
260 struct in_addr cltemp;
263 if ((f=fopen(opts->server->authname,"r"))==NULL) {
264 msg4(LOG_INFO,"Can't open authorization file %s (%s).",
265 opts->server->authname,strerror(errno)) ;
269 inet_aton(opts->clientname, &client);
270 while (fgets(line,LINELEN,f)!=NULL) {
271 if((tmp=index(line, '/'))) {
272 if(strlen(line)<=tmp-line) {
273 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
277 if(inet_aton(line,&addr)) {
278 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
281 len=strtol(tmp, NULL, 0);
282 addr.s_addr>>=32-len;
283 addr.s_addr<<=32-len;
284 memcpy(&cltemp,&client,sizeof(client));
285 cltemp.s_addr>>=32-len;
286 cltemp.s_addr<<=32-len;
287 if(addr.s_addr == cltemp.s_addr) {
291 if (strncmp(line,opts->clientname,strlen(opts->clientname))==0) {
301 * Read data from a file descriptor into a buffer
303 * @param f a file descriptor
304 * @param buf a buffer
305 * @param len the number of bytes to be read
307 inline void readit(int f, void *buf, size_t len) {
311 if ((res = read(f, buf, len)) <= 0) {
312 if(errno != EAGAIN) {
313 err("Read failed: %m");
323 * Write data from a buffer into a filedescriptor
325 * @param f a file descriptor
326 * @param buf a buffer containing data
327 * @param len the number of bytes to be written
329 inline void writeit(int f, void *buf, size_t len) {
333 if ((res = write(f, buf, len)) <= 0)
334 err("Send failed: %m");
341 * Print out a message about how to use nbd-server. Split out to a separate
342 * function so that we can call it from multiple places
345 printf("This is nbd-server version " VERSION "\n");
346 printf("Usage: [ip:|ip6@]port file_to_export [size][kKmM] [-l authorize_file] [-r] [-m] [-c] [-C configuration file] [-p PID file name] [-o section name]\n"
347 "\t-r|--read-only\t\tread only\n"
348 "\t-m|--multi-file\t\tmultiple file\n"
349 "\t-c|--copy-on-write\tcopy on write\n"
350 "\t-C|--config-file\tspecify an alternate configuration file\n"
351 "\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
352 "\t-p|--pid-file\t\tspecify a filename to write our PID to\n"
353 "\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"
354 "\tif port is set to 0, stdin is used (for running from inetd)\n"
355 "\tif file_to_export contains '%%s', it is substituted with the IP\n"
356 "\t\taddress of the machine trying to connect\n"
357 "\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");
358 printf("Using configuration file %s\n", CFILE);
361 /* Dumps a config file section of the given SERVER*, and exits. */
362 void dump_section(SERVER* serve, gchar* section_header) {
363 printf("[%s]\n", section_header);
364 printf("\texportname = %s\n", serve->exportname);
365 printf("\tlistenaddr = %s\n", serve->listenaddr);
366 printf("\tport = %d\n", serve->port);
367 if(serve->flags & F_READONLY) {
368 printf("\treadonly = true\n");
370 if(serve->flags & F_MULTIFILE) {
371 printf("\tmultifile = true\n");
373 if(serve->flags & F_COPYONWRITE) {
374 printf("\tcopyonwrite = true\n");
376 if(serve->expected_size) {
377 printf("\tfilesize = %lld\n", (long long int)serve->expected_size);
379 if(serve->authname) {
380 printf("\tauthfile = %s\n", serve->authname);
386 * Parse the command line.
388 * @param argc the argc argument to main()
389 * @param argv the argv argument to main()
391 SERVER* cmdline(int argc, char *argv[]) {
395 struct option long_options[] = {
396 {"read-only", no_argument, NULL, 'r'},
397 {"multi-file", no_argument, NULL, 'm'},
398 {"copy-on-write", no_argument, NULL, 'c'},
399 {"authorize-file", required_argument, NULL, 'l'},
400 {"config-file", required_argument, NULL, 'C'},
401 {"pid-file", required_argument, NULL, 'p'},
402 {"output-config", required_argument, NULL, 'o'},
409 gboolean do_output=FALSE;
410 gchar* section_header="";
416 serve=g_new0(SERVER, 1);
417 serve->authname = g_strdup(default_authname);
418 serve->virtstyle=VIRT_IPLIT;
419 while((c=getopt_long(argc, argv, "-C:cl:mo:rp:", long_options, &i))>=0) {
422 /* non-option argument */
423 switch(nonspecial++) {
425 if(strchr(optarg, ':') == strrchr(optarg, ':')) {
426 addr_port=g_strsplit(optarg, ":", 2);
428 /* Check for "@" - maybe user using this separator
431 g_strfreev(addr_port);
432 addr_port=g_strsplit(optarg, "@", 2);
435 addr_port=g_strsplit(optarg, "@", 2);
439 serve->port=strtol(addr_port[1], NULL, 0);
440 serve->listenaddr=g_strdup(addr_port[0]);
442 serve->listenaddr=NULL;
443 serve->port=strtol(addr_port[0], NULL, 0);
445 g_strfreev(addr_port);
448 serve->exportname = g_strdup(optarg);
449 if(serve->exportname[0] != '/') {
450 fprintf(stderr, "E: The to be exported file needs to be an absolute filename!\n");
455 last=strlen(optarg)-1;
457 if (suffix == 'k' || suffix == 'K' ||
458 suffix == 'm' || suffix == 'M')
460 es = (off_t)atoll(optarg);
468 serve->expected_size = es;
473 serve->flags |= F_READONLY;
476 serve->flags |= F_MULTIFILE;
480 section_header = g_strdup(optarg);
483 strncpy(pidftemplate, optarg, 256);
486 serve->flags |=F_COPYONWRITE;
489 g_free(config_file_pos);
490 config_file_pos=g_strdup(optarg);
493 g_free(serve->authname);
494 serve->authname=g_strdup(optarg);
502 /* What's left: the port to export, the name of the to be exported
503 * file, and, optionally, the size of the file, in that order. */
510 g_critical("Need a complete configuration on the command line to output a config file section!");
513 dump_section(serve, section_header);
519 * Error codes for config file parsing
522 CFILE_NOTFOUND, /**< The configuration file is not found */
523 CFILE_MISSING_GENERIC, /**< The (required) group "generic" is missing */
524 CFILE_KEY_MISSING, /**< A (required) key is missing */
525 CFILE_VALUE_INVALID, /**< A value is syntactically invalid */
526 CFILE_VALUE_UNSUPPORTED,/**< A value is not supported in this build */
527 CFILE_PROGERR, /**< Programmer error */
528 CFILE_NO_EXPORTS /**< A config file was specified that does not
529 define any exports */
533 * Remove a SERVER from memory. Used from the hash table
535 void remove_server(gpointer s) {
539 g_free(server->exportname);
541 g_free(server->authname);
547 * @param s the old server we want to duplicate
548 * @return new duplicated server
550 SERVER* dup_serve(SERVER *s) {
551 SERVER *serve = NULL;
553 serve=g_new0(SERVER, 1);
558 serve->exportname = g_strdup(s->exportname);
560 serve->expected_size = s->expected_size;
563 serve->listenaddr = g_strdup(s->listenaddr);
565 serve->port = s->port;
568 serve->authname = strdup(s->authname);
570 serve->flags = s->flags;
571 serve->socket = serve->socket;
572 serve->socket_family = serve->socket_family;
573 serve->cidrlen = s->cidrlen;
576 serve->prerun = g_strdup(s->prerun);
579 serve->postrun = g_strdup(s->postrun);
585 * append new server to array
587 * @param a server array
588 * @return 0 success, -1 error
590 int append_serve(SERVER *s, GArray *a)
593 struct addrinfo hints;
594 struct addrinfo *ai = NULL;
595 struct addrinfo *rp = NULL;
596 char host[NI_MAXHOST];
602 err("Invalid parsing server");
606 port = g_strdup_printf("%d", s->port);
608 memset(&hints,'\0',sizeof(hints));
609 hints.ai_family = AF_UNSPEC;
610 hints.ai_socktype = SOCK_STREAM;
611 hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
612 hints.ai_protocol = IPPROTO_TCP;
614 e = getaddrinfo(s->listenaddr, port, &hints, &ai);
620 for (rp = ai; rp != NULL; rp = rp->ai_next) {
621 e = getnameinfo(rp->ai_addr, rp->ai_addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST);
623 if (e != 0) { // error
624 fprintf(stderr, "getnameinfo: %s\n", gai_strerror(e));
628 // duplicate server and set listenaddr to resolved IP address
631 ns->listenaddr = g_strdup(host);
632 ns->socket_family = rp->ai_family;
633 g_array_append_val(a, *ns);
641 fprintf(stderr, "getaddrinfo failed on listen host/address: %s (%s)\n", s->listenaddr ? s->listenaddr : "any", gai_strerror(e));
652 * Parse the config file.
654 * @param f the name of the config file
655 * @param e a GError. @see CFILE_ERRORS for what error values this function can
657 * @return a Array of SERVER* pointers, If the config file is empty or does not
658 * exist, returns an empty GHashTable; if the config file contains an
659 * error, returns NULL, and e is set appropriately
661 GArray* parse_cfile(gchar* f, GError** e) {
662 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
663 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
665 gchar *virtstyle=NULL;
667 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
668 { "port", TRUE, PARAM_INT, NULL, 0 },
669 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
670 { "filesize", FALSE, PARAM_INT, NULL, 0 },
671 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
672 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
673 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
674 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
675 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
676 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
677 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
678 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
679 { "sync", FALSE, PARAM_BOOL, NULL, F_SYNC },
680 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
682 const int lp_size=sizeof(lp)/sizeof(PARAM);
684 { "user", FALSE, PARAM_STRING, &runuser, 0 },
685 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
688 int p_size=sizeof(gp)/sizeof(PARAM);
691 const char *err_msg=NULL;
700 errdomain = g_quark_from_string("parse_cfile");
701 cfile = g_key_file_new();
702 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
703 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
704 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
705 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file %s.", f);
706 g_key_file_free(cfile);
709 startgroup = g_key_file_get_start_group(cfile);
710 if(!startgroup || strcmp(startgroup, "generic")) {
711 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
712 g_key_file_free(cfile);
715 groups = g_key_file_get_groups(cfile, NULL);
716 for(i=0;groups[i];i++) {
717 memset(&s, '\0', sizeof(SERVER));
718 lp[0].target=&(s.exportname);
719 lp[1].target=&(s.port);
720 lp[2].target=&(s.authname);
721 lp[3].target=&(s.expected_size);
722 lp[4].target=&(virtstyle);
723 lp[5].target=&(s.prerun);
724 lp[6].target=&(s.postrun);
725 lp[7].target=lp[8].target=lp[9].target=
726 lp[10].target=lp[11].target=
727 lp[12].target=&(s.flags);
728 lp[13].target=&(s.listenaddr);
730 /* After the [generic] group, start parsing exports */
735 for(j=0;j<p_size;j++) {
736 g_assert(p[j].target != NULL);
737 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
740 *((gint*)p[j].target) =
741 g_key_file_get_integer(cfile,
747 *((gchar**)p[j].target) =
748 g_key_file_get_string(cfile,
754 value = g_key_file_get_boolean(cfile,
756 p[j].paramname, &err);
759 *((gint*)p[j].target) |= p[j].flagval;
761 *((gint*)p[j].target) &= ~(p[j].flagval);
767 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
769 /* Ignore not-found error for optional values */
773 err_msg = MISSING_REQUIRED_ERROR;
776 err_msg = DEFAULT_ERROR;
778 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
779 g_array_free(retval, TRUE);
781 g_key_file_free(cfile);
786 if(!strncmp(virtstyle, "none", 4)) {
787 s.virtstyle=VIRT_NONE;
788 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
789 s.virtstyle=VIRT_IPLIT;
790 } else if(!strncmp(virtstyle, "iphash", 6)) {
791 s.virtstyle=VIRT_IPHASH;
792 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
793 s.virtstyle=VIRT_CIDR;
794 if(strlen(virtstyle)<10) {
795 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
796 g_array_free(retval, TRUE);
797 g_key_file_free(cfile);
800 s.cidrlen=strtol(virtstyle+8, NULL, 0);
802 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
803 g_array_free(retval, TRUE);
804 g_key_file_free(cfile);
808 s.virtstyle=VIRT_IPLIT;
810 /* Don't need to free this, it's not our string */
812 /* Don't append values for the [generic] group */
814 s.socket_family = AF_UNSPEC;
816 append_serve(&s, retval);
819 if(s.flags & F_SDP) {
820 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
821 g_array_free(retval, TRUE);
822 g_key_file_free(cfile);
828 g_set_error(e, errdomain, CFILE_NO_EXPORTS, "The config file does not specify any exports");
830 g_key_file_free(cfile);
835 * Signal handler for SIGCHLD
836 * @param s the signal we're handling (must be SIGCHLD, or something
839 void sigchld_handler(int s) {
844 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
845 if(WIFEXITED(status)) {
846 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
848 i=g_hash_table_lookup(children, &pid);
850 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
852 DEBUG2("Removing %d from the list of children", pid);
853 g_hash_table_remove(children, &pid);
859 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
862 * @param value the value corresponding to the above key
863 * @param user_data a pointer which we always set to 1, so that we know what
866 void killchild(gpointer key, gpointer value, gpointer user_data) {
868 int *parent=user_data;
875 * Handle SIGTERM and dispatch it to our children
876 * @param s the signal we're handling (must be SIGTERM, or something
877 * is severely wrong).
879 void sigterm_handler(int s) {
882 g_hash_table_foreach(children, killchild, &parent);
892 * Detect the size of a file.
894 * @param fhandle An open filedescriptor
895 * @return the size of the file, or OFFT_MAX if detection was
898 off_t size_autodetect(int fhandle) {
901 struct stat stat_buf;
904 #ifdef HAVE_SYS_MOUNT_H
905 #ifdef HAVE_SYS_IOCTL_H
907 DEBUG("looking for export size with ioctl BLKGETSIZE64\n");
908 if (!ioctl(fhandle, BLKGETSIZE64, bytes) && bytes) {
911 #endif /* BLKGETSIZE64 */
912 #endif /* HAVE_SYS_IOCTL_H */
913 #endif /* HAVE_SYS_MOUNT_H */
915 DEBUG("looking for fhandle size with fstat\n");
916 stat_buf.st_size = 0;
917 error = fstat(fhandle, &stat_buf);
919 if(stat_buf.st_size > 0)
920 return (off_t)stat_buf.st_size;
922 err("fstat failed: %m");
925 DEBUG("looking for fhandle size with lseek SEEK_END\n");
926 es = lseek(fhandle, (off_t)0, SEEK_END);
927 if (es > ((off_t)0)) {
930 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
933 err("Could not find size of exported block device: %m");
938 * Get the file handle and offset, given an export offset.
940 * @param export An array of export files
941 * @param a The offset to get corresponding file/offset for
942 * @param fhandle [out] File descriptor
943 * @param foffset [out] Offset into fhandle
944 * @param maxbytes [out] Tells how many bytes can be read/written
945 * from fhandle starting at foffset (0 if there is no limit)
946 * @return 0 on success, -1 on failure
948 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
949 /* Negative offset not allowed */
953 /* Binary search for last file with starting offset <= a */
956 int end = export->len - 1;
957 while( start <= end ) {
958 int mid = (start + end) / 2;
959 fi = g_array_index(export, FILE_INFO, mid);
960 if( fi.startoff < a ) {
962 } else if( fi.startoff > a ) {
970 /* end should never go negative, since first startoff is 0 and a >= 0 */
973 fi = g_array_index(export, FILE_INFO, end);
974 *fhandle = fi.fhandle;
975 *foffset = a - fi.startoff;
977 if( end+1 < export->len ) {
978 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
979 *maxbytes = fi_next.startoff - a;
986 * seek to a position in a file, with error handling.
987 * @param handle a filedescriptor
988 * @param a position to seek to
989 * @todo get rid of this; lastpoint is a global variable right now, but it
990 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
993 void myseek(int handle,off_t a) {
994 if (lseek(handle, a, SEEK_SET) < 0) {
995 err("Can not seek locally!\n");
1000 * Write an amount of bytes at a given offset to the right file. This
1001 * abstracts the write-side of the multiple file option.
1003 * @param a The offset where the write should start
1004 * @param buf The buffer to write from
1005 * @param len The length of buf
1006 * @param client The client we're serving for
1007 * @return The number of bytes actually written, or -1 in case of an error
1009 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1015 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
1017 if(maxbytes && len > maxbytes)
1020 DEBUG4("(WRITE to fd %d offset %llu len %u), ", fhandle, foffset, len);
1022 myseek(fhandle, foffset);
1023 retval = write(fhandle, buf, len);
1024 if(client->server->flags & F_SYNC) {
1031 * Call rawexpwrite repeatedly until all data has been written.
1032 * @return 0 on success, nonzero on failure
1034 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
1037 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
1042 return (ret < 0 || len != 0);
1046 * Read an amount of bytes at a given offset from the right file. This
1047 * abstracts the read-side of the multiple files option.
1049 * @param a The offset where the read should start
1050 * @param buf A buffer to read into
1051 * @param len The size of buf
1052 * @param client The client we're serving for
1053 * @return The number of bytes actually read, or -1 in case of an
1056 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
1061 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
1063 if(maxbytes && len > maxbytes)
1066 DEBUG4("(READ from fd %d offset %llu len %u), ", fhandle, foffset, len);
1068 myseek(fhandle, foffset);
1069 return read(fhandle, buf, len);
1073 * Call rawexpread repeatedly until all data has been read.
1074 * @return 0 on success, nonzero on failure
1076 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
1079 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
1084 return (ret < 0 || len != 0);
1088 * Read an amount of bytes at a given offset from the right file. This
1089 * abstracts the read-side of the copyonwrite stuff, and calls
1090 * rawexpread() with the right parameters to do the actual work.
1091 * @param a The offset where the read should start
1092 * @param buf A buffer to read into
1093 * @param len The size of buf
1094 * @param client The client we're going to read for
1095 * @return 0 on success, nonzero on failure
1097 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
1098 off_t rdlen, offset;
1099 off_t mapcnt, mapl, maph, pagestart;
1101 if (!(client->server->flags & F_COPYONWRITE))
1102 return(rawexpread_fully(a, buf, len, client));
1103 DEBUG3("Asked to read %d bytes at %llu.\n", len, (unsigned long long)a);
1105 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
1107 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1108 pagestart=mapcnt*DIFFPAGESIZE;
1110 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1111 len : (size_t)DIFFPAGESIZE-offset;
1112 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1113 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1114 (unsigned long)(client->difmap[mapcnt]));
1115 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1116 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
1117 } else { /* the block is not there */
1118 DEBUG2("Page %llu is not here, we read the original one\n",
1119 (unsigned long long)mapcnt);
1120 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
1122 len-=rdlen; a+=rdlen; buf+=rdlen;
1128 * Write an amount of bytes at a given offset to the right file. This
1129 * abstracts the write-side of the copyonwrite option, and calls
1130 * rawexpwrite() with the right parameters to do the actual work.
1132 * @param a The offset where the write should start
1133 * @param buf The buffer to write from
1134 * @param len The length of buf
1135 * @param client The client we're going to write for.
1136 * @return 0 on success, nonzero on failure
1138 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1139 char pagebuf[DIFFPAGESIZE];
1140 off_t mapcnt,mapl,maph;
1145 if (!(client->server->flags & F_COPYONWRITE))
1146 return(rawexpwrite_fully(a, buf, len, client));
1147 DEBUG3("Asked to write %d bytes at %llu.\n", len, (unsigned long long)a);
1149 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1151 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1152 pagestart=mapcnt*DIFFPAGESIZE ;
1153 offset=a-pagestart ;
1154 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1155 len : (size_t)DIFFPAGESIZE-offset;
1157 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1158 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1159 (unsigned long)(client->difmap[mapcnt])) ;
1160 myseek(client->difffile,
1161 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1162 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1163 } else { /* the block is not there */
1164 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1165 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1166 DEBUG3("Page %llu is not here, we put it at %lu\n",
1167 (unsigned long long)mapcnt,
1168 (unsigned long)(client->difmap[mapcnt]));
1169 rdlen=DIFFPAGESIZE ;
1170 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1172 memcpy(pagebuf+offset,buf,wrlen) ;
1173 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1177 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1183 * Do the initial negotiation.
1185 * @param client The client we're negotiating with.
1187 void negotiate(CLIENT *client) {
1190 u32 flags = NBD_FLAG_HAS_FLAGS;
1192 memset(zeros, '\0', sizeof(zeros));
1193 if (write(client->net, INIT_PASSWD, 8) < 0)
1194 err("Negotiation failed: %m");
1195 cliserv_magic = htonll(cliserv_magic);
1196 if (write(client->net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
1197 err("Negotiation failed: %m");
1198 size_host = htonll((u64)(client->exportsize));
1199 if (write(client->net, &size_host, 8) < 0)
1200 err("Negotiation failed: %m");
1201 if (client->server->flags & F_READONLY)
1202 flags |= NBD_FLAG_READ_ONLY;
1203 flags = htonl(flags);
1204 if (write(client->net, &flags, 4) < 0)
1205 err("Negotiation failed: %m");
1206 if (write(client->net, zeros, 124) < 0)
1207 err("Negotiation failed: %m");
1210 /** sending macro. */
1211 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1213 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1215 * Serve a file to a single client.
1217 * @todo This beast needs to be split up in many tiny little manageable
1218 * pieces. Preferably with a chainsaw.
1220 * @param client The client we're going to serve to.
1221 * @return when the client disconnects
1223 int mainloop(CLIENT *client) {
1224 struct nbd_request request;
1225 struct nbd_reply reply;
1226 gboolean go_on=TRUE;
1231 DEBUG("Entering request loop!\n");
1232 reply.magic = htonl(NBD_REPLY_MAGIC);
1241 readit(client->net, &request, sizeof(request));
1242 request.from = ntohll(request.from);
1243 request.type = ntohl(request.type);
1245 if (request.type==NBD_CMD_DISC) {
1246 msg2(LOG_INFO, "Disconnect request received.");
1247 if (client->server->flags & F_COPYONWRITE) {
1248 if (client->difmap) g_free(client->difmap) ;
1249 close(client->difffile);
1250 unlink(client->difffilename);
1251 free(client->difffilename);
1257 len = ntohl(request.len);
1259 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1260 err("Not enough magic.");
1261 if (len > BUFSIZE + sizeof(struct nbd_reply))
1262 err("Request too big!");
1264 printf("%s from %llu (%llu) len %d, ", request.type ? "WRITE" :
1265 "READ", (unsigned long long)request.from,
1266 (unsigned long long)request.from / 512, len);
1268 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1269 if ((request.from + len) > (OFFT_MAX)) {
1270 DEBUG("[Number too large!]");
1271 ERROR(client, reply, EINVAL);
1275 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1277 ERROR(client, reply, EINVAL);
1281 if (request.type==NBD_CMD_WRITE) {
1282 DEBUG("wr: net->buf, ");
1283 readit(client->net, buf, len);
1284 DEBUG("buf->exp, ");
1285 if ((client->server->flags & F_READONLY) ||
1286 (client->server->flags & F_AUTOREADONLY)) {
1287 DEBUG("[WRITE to READONLY!]");
1288 ERROR(client, reply, EPERM);
1291 if (expwrite(request.from, buf, len, client)) {
1292 DEBUG("Write failed: %m" );
1293 ERROR(client, reply, errno);
1296 SEND(client->net, reply);
1302 DEBUG("exp->buf, ");
1303 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1304 DEBUG("Read failed: %m");
1305 ERROR(client, reply, errno);
1309 DEBUG("buf->net, ");
1310 memcpy(buf, &reply, sizeof(struct nbd_reply));
1311 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1318 * Set up client export array, which is an array of FILE_INFO.
1319 * Also, split a single exportfile into multiple ones, if that was asked.
1320 * @param client information on the client which we want to setup export for
1322 void setupexport(CLIENT* client) {
1324 off_t laststartoff = 0, lastsize = 0;
1325 int multifile = (client->server->flags & F_MULTIFILE);
1327 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1329 /* If multi-file, open as many files as we can.
1330 * If not, open exactly one file.
1331 * Calculate file sizes as we go to get total size. */
1335 gchar* error_string;
1336 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1339 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1341 tmpname=g_strdup(client->exportname);
1343 DEBUG2( "Opening %s\n", tmpname );
1344 fi.fhandle = open(tmpname, mode);
1345 if(fi.fhandle == -1 && mode == O_RDWR) {
1346 /* Try again because maybe media was read-only */
1347 fi.fhandle = open(tmpname, O_RDONLY);
1348 if(fi.fhandle != -1) {
1349 /* Opening the base file in copyonwrite mode is
1351 if(!(client->server->flags & F_COPYONWRITE)) {
1352 client->server->flags |= F_AUTOREADONLY;
1353 client->server->flags |= F_READONLY;
1357 if(fi.fhandle == -1) {
1358 if(multifile && i>0)
1360 error_string=g_strdup_printf(
1361 "Could not open exported file %s: %%m",
1365 fi.startoff = laststartoff + lastsize;
1366 g_array_append_val(client->export, fi);
1369 /* Starting offset and size of this file will be used to
1370 * calculate starting offset of next file */
1371 laststartoff = fi.startoff;
1372 lastsize = size_autodetect(fi.fhandle);
1378 /* Set export size to total calculated size */
1379 client->exportsize = laststartoff + lastsize;
1381 /* Export size may be overridden */
1382 if(client->server->expected_size) {
1383 /* desired size must be <= total calculated size */
1384 if(client->server->expected_size > client->exportsize) {
1385 err("Size of exported file is too big\n");
1388 client->exportsize = client->server->expected_size;
1391 msg3(LOG_INFO, "Size of exported file/device is %llu", (unsigned long long)client->exportsize);
1393 msg3(LOG_INFO, "Total number of files: %d", i);
1397 int copyonwrite_prepare(CLIENT* client) {
1399 if ((client->difffilename = malloc(1024))==NULL)
1400 err("Failed to allocate string for diff file name");
1401 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1403 client->difffilename[1023]='\0';
1404 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1405 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1406 if (client->difffile<0) err("Could not create diff file (%m)") ;
1407 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1408 err("Could not allocate memory") ;
1409 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1415 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1418 * @param command the command to be ran. Read from the config file
1419 * @param file the file name we're about to export
1421 int do_run(gchar* command, gchar* file) {
1425 if(command && *command) {
1426 cmd = g_strdup_printf(command, file);
1434 * Serve a connection.
1436 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1437 * follow the road map.
1439 * @param client a connected client
1441 void serveconnection(CLIENT *client) {
1442 if(do_run(client->server->prerun, client->exportname)) {
1445 setupexport(client);
1447 if (client->server->flags & F_COPYONWRITE) {
1448 copyonwrite_prepare(client);
1451 setmysockopt(client->net);
1454 do_run(client->server->postrun, client->exportname);
1458 * Find the name of the file we have to serve. This will use g_strdup_printf
1459 * to put the IP address of the client inside a filename containing
1460 * "%s" (in the form as specified by the "virtstyle" option). That name
1461 * is then written to client->exportname.
1463 * @param net A socket connected to an nbd client
1464 * @param client information about the client. The IP address in human-readable
1465 * format will be written to a new char* buffer, the address of which will be
1466 * stored in client->clientname.
1468 void set_peername(int net, CLIENT *client) {
1469 struct sockaddr_storage addrin;
1470 struct sockaddr_storage netaddr;
1471 struct sockaddr_in *netaddr4 = NULL;
1472 struct sockaddr_in6 *netaddr6 = NULL;
1473 size_t addrinlen = sizeof( addrin );
1474 struct addrinfo hints;
1475 struct addrinfo *ai = NULL;
1476 char peername[NI_MAXHOST];
1477 char netname[NI_MAXHOST];
1483 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1484 err("getsockname failed: %m");
1486 getnameinfo((struct sockaddr *)&addrin, (socklen_t)addrinlen,
1487 peername, sizeof (peername), NULL, 0, NI_NUMERICHOST);
1489 memset(&hints, '\0', sizeof (hints));
1490 hints.ai_flags = AI_ADDRCONFIG;
1491 e = getaddrinfo(peername, NULL, &hints, &ai);
1494 fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
1499 switch(client->server->virtstyle) {
1501 client->exportname=g_strdup(client->server->exportname);
1504 for(i=0;i<strlen(peername);i++) {
1505 if(peername[i]=='.') {
1510 client->exportname=g_strdup_printf(client->server->exportname, peername);
1513 memcpy(&netaddr, &addrin, addrinlen);
1514 if(ai->ai_family == AF_INET) {
1515 netaddr4 = (struct sockaddr_in *)&netaddr;
1516 (netaddr4->sin_addr).s_addr>>=32-(client->server->cidrlen);
1517 (netaddr4->sin_addr).s_addr<<=32-(client->server->cidrlen);
1519 getnameinfo((struct sockaddr *) netaddr4, (socklen_t) addrinlen,
1520 netname, sizeof (netname), NULL, 0, NI_NUMERICHOST);
1521 tmp=g_strdup_printf("%s/%s", netname, peername);
1522 }else if(ai->ai_family == AF_INET6) {
1523 netaddr6 = (struct sockaddr_in6 *)&netaddr;
1525 shift = 128-(client->server->cidrlen);
1527 while(shift >= 32) {
1528 ((netaddr6->sin6_addr).s6_addr32[i])=0;
1532 (netaddr6->sin6_addr).s6_addr32[i]>>=shift;
1533 (netaddr6->sin6_addr).s6_addr32[i]<<=shift;
1535 getnameinfo((struct sockaddr *)netaddr6, (socklen_t)addrinlen,
1536 netname, sizeof(netname), NULL, 0, NI_NUMERICHOST);
1537 tmp=g_strdup_printf("%s/%s", netname, peername);
1541 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1547 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1548 peername, client->exportname);
1549 client->clientname=g_strdup(peername);
1554 * @param data a pointer to pid_t which should be freed
1556 void destroy_pid_t(gpointer data) {
1561 * Loop through the available servers, and serve them. Never returns.
1563 int serveloop(GArray* servers) {
1564 struct sockaddr_storage addrin;
1565 socklen_t addrinlen=sizeof(addrin);
1574 * Set up the master fd_set. The set of descriptors we need
1575 * to select() for never changes anyway and it buys us a *lot*
1576 * of time to only build this once. However, if we ever choose
1577 * to not fork() for clients anymore, we may have to revisit
1582 for(i=0;i<servers->len;i++) {
1583 sock=(g_array_index(servers, SERVER, i)).socket;
1584 FD_SET(sock, &mset);
1585 max=sock>max?sock:max;
1592 memcpy(&rset, &mset, sizeof(fd_set));
1593 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1595 for(i=0;i<servers->len;i++) {
1596 serve=&(g_array_index(servers, SERVER, i));
1597 if(FD_ISSET(serve->socket, &rset)) {
1599 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1602 if((sock_flags = fcntl(net, F_GETFL, 0))==-1) {
1603 err("fcntl F_GETFL");
1605 if(fcntl(net, F_SETFL, sock_flags &~O_NONBLOCK)==-1) {
1606 err("fcntl F_SETFL ~O_NONBLOCK");
1608 client = g_malloc(sizeof(CLIENT));
1609 client->server=serve;
1610 client->exportsize=OFFT_MAX;
1612 set_peername(net, client);
1613 if (!authorized_client(client)) {
1614 msg2(LOG_INFO,"Unauthorized client") ;
1618 msg2(LOG_INFO,"Authorized client") ;
1619 pid=g_malloc(sizeof(pid_t));
1621 if ((*pid=fork())<0) {
1622 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1626 if (*pid>0) { /* parent */
1628 g_hash_table_insert(children, pid, pid);
1632 g_hash_table_destroy(children);
1633 for(i=0;i<servers->len;i++) {
1634 serve=&g_array_index(servers, SERVER, i);
1635 close(serve->socket);
1637 /* FALSE does not free the
1638 actual data. This is required,
1639 because the client has a
1640 direct reference into that
1641 data, and otherwise we get a
1643 g_array_free(servers, FALSE);
1645 msg2(LOG_INFO,"Starting to serve");
1646 serveconnection(client);
1655 * Connect a server's socket.
1657 * @param serve the server we want to connect.
1659 void setup_serve(SERVER *serve) {
1660 struct sockaddr_storage addrin;
1661 struct addrinfo hints;
1662 struct addrinfo *ai = NULL;
1663 struct sigaction sa;
1664 int addrinlen = sizeof(addrin);
1674 memset(&hints,'\0',sizeof(hints));
1675 hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG | AI_NUMERICSERV;
1676 hints.ai_socktype = SOCK_STREAM;
1677 hints.ai_family = serve->socket_family;
1679 port = g_strdup_printf ("%d", serve->port);
1683 e = getaddrinfo(serve->listenaddr,port,&hints,&ai);
1688 fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
1694 if(serve->socket_family == AF_UNSPEC)
1695 serve->socket_family = ai->ai_family;
1698 if ((serve->flags) && F_SDP) {
1699 if (ai->ai_family == AF_INET)
1700 ai->ai_family = AF_INET_SDP;
1701 else (ai->ai_family == AF_INET6)
1702 ai->ai_family = AF_INET6_SDP;
1705 if ((serve->socket = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0)
1708 /* lose the pesky "Address already in use" error message */
1709 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1710 err("setsockopt SO_REUSEADDR");
1712 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1713 err("setsockopt SO_KEEPALIVE");
1716 /* make the listening socket non-blocking */
1717 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1718 err("fcntl F_GETFL");
1720 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1721 err("fcntl F_SETFL O_NONBLOCK");
1724 DEBUG("Waiting for connections... bind, ");
1725 e = bind(serve->socket, ai->ai_addr, ai->ai_addrlen);
1726 if (e != 0 && errno != EADDRINUSE)
1729 if (listen(serve->socket, 1) < 0)
1734 sa.sa_handler = sigchld_handler;
1735 sigemptyset(&sa.sa_mask);
1736 sa.sa_flags = SA_RESTART;
1737 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1738 err("sigaction: %m");
1739 sa.sa_handler = sigterm_handler;
1740 sigemptyset(&sa.sa_mask);
1741 sa.sa_flags = SA_RESTART;
1742 if(sigaction(SIGTERM, &sa, NULL) == -1)
1743 err("sigaction: %m");
1747 * Connect our servers.
1749 void setup_servers(GArray* servers) {
1752 for(i=0;i<servers->len;i++) {
1753 setup_serve(&(g_array_index(servers, SERVER, i)));
1755 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1759 * Go daemon (unless we specified at compile time that we didn't want this)
1760 * @param serve the first server of our configuration. If its port is zero,
1761 * then do not daemonize, because we're doing inetd then. This parameter
1762 * is only used to create a PID file of the form
1763 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1765 #if !defined(NODAEMON) && !defined(NOFORK)
1766 void daemonize(SERVER* serve) {
1769 if(serve && !(serve->port)) {
1775 if(!*pidftemplate) {
1777 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1779 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1782 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1783 pidf=fopen(pidfname, "w");
1785 fprintf(pidf,"%d\n", (int)getpid());
1789 fprintf(stderr, "Not fatal; continuing");
1793 #define daemonize(serve)
1794 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1797 * Everything beyond this point (in the file) is run in non-daemon mode.
1798 * The stuff above daemonize() isn't.
1801 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1803 void serve_err(SERVER* serve, const char* msg) {
1804 g_message("Export of %s on port %d failed:", serve->exportname,
1810 * Set up user-ID and/or group-ID
1812 void dousers(void) {
1817 gr=getgrnam(rungroup);
1819 str = g_strdup_printf("Invalid group name: %s", rungroup);
1822 if(setgid(gr->gr_gid)<0) {
1823 err("Could not set GID: %m");
1827 pw=getpwnam(runuser);
1829 str = g_strdup_printf("Invalid user name: %s", runuser);
1832 if(setuid(pw->pw_uid)<0) {
1833 err("Could not set UID: %m");
1839 void glib_message_syslog_redirect(const gchar *log_domain,
1840 GLogLevelFlags log_level,
1841 const gchar *message,
1844 int level=LOG_DEBUG;
1848 case G_LOG_FLAG_FATAL:
1849 case G_LOG_LEVEL_CRITICAL:
1850 case G_LOG_LEVEL_ERROR:
1853 case G_LOG_LEVEL_WARNING:
1856 case G_LOG_LEVEL_MESSAGE:
1857 case G_LOG_LEVEL_INFO:
1860 case G_LOG_LEVEL_DEBUG:
1865 syslog(level, message);
1870 * Main entry point...
1872 int main(int argc, char *argv[]) {
1877 if (sizeof( struct nbd_request )!=28) {
1878 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1879 exit(EXIT_FAILURE) ;
1882 memset(pidftemplate, '\0', 256);
1885 config_file_pos = g_strdup(CFILE);
1886 serve=cmdline(argc, argv);
1887 servers = parse_cfile(config_file_pos, &err);
1890 serve->socket_family = AF_UNSPEC;
1892 append_serve(serve, servers);
1894 if (!(serve->port)) {
1897 /* You really should define ISSERVER if you're going to use
1898 * inetd mode, but if you don't, closing stdout and stderr
1899 * (which inetd had connected to the client socket) will let it
1903 open("/dev/null", O_WRONLY);
1904 open("/dev/null", O_WRONLY);
1905 g_log_set_default_handler( glib_message_syslog_redirect, NULL );
1907 client=g_malloc(sizeof(CLIENT));
1908 client->server=serve;
1910 client->exportsize=OFFT_MAX;
1911 set_peername(0,client);
1912 serveconnection(client);
1917 if(!servers || !servers->len) {
1918 g_warning("Could not parse config file: %s",
1919 err ? err->message : "Unknown error");
1922 if((!serve) && (!servers||!servers->len)) {
1923 g_message("Nothing to do! Bye!");
1927 setup_servers(servers);