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);
542 if(server->listenaddr)
543 g_free(server->listenaddr);
545 g_free(server->prerun);
547 g_free(server->postrun);
553 * @param s the old server we want to duplicate
554 * @return new duplicated server
556 SERVER* dup_serve(SERVER *s) {
557 SERVER *serve = NULL;
559 serve=g_new0(SERVER, 1);
564 serve->exportname = g_strdup(s->exportname);
566 serve->expected_size = s->expected_size;
569 serve->listenaddr = g_strdup(s->listenaddr);
571 serve->port = s->port;
574 serve->authname = strdup(s->authname);
576 serve->flags = s->flags;
577 serve->socket = serve->socket;
578 serve->socket_family = serve->socket_family;
579 serve->cidrlen = s->cidrlen;
582 serve->prerun = g_strdup(s->prerun);
585 serve->postrun = g_strdup(s->postrun);
591 * append new server to array
593 * @param a server array
594 * @return 0 success, -1 error
596 int append_serve(SERVER *s, GArray *a)
599 struct addrinfo hints;
600 struct addrinfo *ai = NULL;
601 struct addrinfo *rp = NULL;
602 char host[NI_MAXHOST];
608 err("Invalid parsing server");
612 port = g_strdup_printf("%d", s->port);
614 memset(&hints,'\0',sizeof(hints));
615 hints.ai_family = AF_UNSPEC;
616 hints.ai_socktype = SOCK_STREAM;
617 hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
618 hints.ai_protocol = IPPROTO_TCP;
620 e = getaddrinfo(s->listenaddr, port, &hints, &ai);
626 for (rp = ai; rp != NULL; rp = rp->ai_next) {
627 e = getnameinfo(rp->ai_addr, rp->ai_addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST);
629 if (e != 0) { // error
630 fprintf(stderr, "getnameinfo: %s\n", gai_strerror(e));
634 // duplicate server and set listenaddr to resolved IP address
637 ns->listenaddr = g_strdup(host);
638 ns->socket_family = rp->ai_family;
639 g_array_append_val(a, *ns);
647 fprintf(stderr, "getaddrinfo failed on listen host/address: %s (%s)\n", s->listenaddr ? s->listenaddr : "any", gai_strerror(e));
658 * Parse the config file.
660 * @param f the name of the config file
661 * @param e a GError. @see CFILE_ERRORS for what error values this function can
663 * @return a Array of SERVER* pointers, If the config file is empty or does not
664 * exist, returns an empty GHashTable; if the config file contains an
665 * error, returns NULL, and e is set appropriately
667 GArray* parse_cfile(gchar* f, GError** e) {
668 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
669 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
671 gchar *virtstyle=NULL;
673 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
674 { "port", TRUE, PARAM_INT, NULL, 0 },
675 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
676 { "filesize", FALSE, PARAM_INT, NULL, 0 },
677 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
678 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
679 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
680 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
681 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
682 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
683 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
684 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
685 { "sync", FALSE, PARAM_BOOL, NULL, F_SYNC },
686 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
688 const int lp_size=sizeof(lp)/sizeof(PARAM);
690 { "user", FALSE, PARAM_STRING, &runuser, 0 },
691 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
694 int p_size=sizeof(gp)/sizeof(PARAM);
697 const char *err_msg=NULL;
706 errdomain = g_quark_from_string("parse_cfile");
707 cfile = g_key_file_new();
708 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
709 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
710 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
711 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file %s.", f);
712 g_key_file_free(cfile);
715 startgroup = g_key_file_get_start_group(cfile);
716 if(!startgroup || strcmp(startgroup, "generic")) {
717 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
718 g_key_file_free(cfile);
721 groups = g_key_file_get_groups(cfile, NULL);
722 for(i=0;groups[i];i++) {
723 memset(&s, '\0', sizeof(SERVER));
724 lp[0].target=&(s.exportname);
725 lp[1].target=&(s.port);
726 lp[2].target=&(s.authname);
727 lp[3].target=&(s.expected_size);
728 lp[4].target=&(virtstyle);
729 lp[5].target=&(s.prerun);
730 lp[6].target=&(s.postrun);
731 lp[7].target=lp[8].target=lp[9].target=
732 lp[10].target=lp[11].target=
733 lp[12].target=&(s.flags);
734 lp[13].target=&(s.listenaddr);
736 /* After the [generic] group, start parsing exports */
741 for(j=0;j<p_size;j++) {
742 g_assert(p[j].target != NULL);
743 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
746 *((gint*)p[j].target) =
747 g_key_file_get_integer(cfile,
753 *((gchar**)p[j].target) =
754 g_key_file_get_string(cfile,
760 value = g_key_file_get_boolean(cfile,
762 p[j].paramname, &err);
765 *((gint*)p[j].target) |= p[j].flagval;
767 *((gint*)p[j].target) &= ~(p[j].flagval);
773 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
775 /* Ignore not-found error for optional values */
779 err_msg = MISSING_REQUIRED_ERROR;
782 err_msg = DEFAULT_ERROR;
784 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
785 g_array_free(retval, TRUE);
787 g_key_file_free(cfile);
792 if(!strncmp(virtstyle, "none", 4)) {
793 s.virtstyle=VIRT_NONE;
794 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
795 s.virtstyle=VIRT_IPLIT;
796 } else if(!strncmp(virtstyle, "iphash", 6)) {
797 s.virtstyle=VIRT_IPHASH;
798 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
799 s.virtstyle=VIRT_CIDR;
800 if(strlen(virtstyle)<10) {
801 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
802 g_array_free(retval, TRUE);
803 g_key_file_free(cfile);
806 s.cidrlen=strtol(virtstyle+8, NULL, 0);
808 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
809 g_array_free(retval, TRUE);
810 g_key_file_free(cfile);
814 s.virtstyle=VIRT_IPLIT;
816 /* Don't need to free this, it's not our string */
818 /* Don't append values for the [generic] group */
820 s.socket_family = AF_UNSPEC;
822 append_serve(&s, retval);
825 if(s.flags & F_SDP) {
826 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
827 g_array_free(retval, TRUE);
828 g_key_file_free(cfile);
834 g_set_error(e, errdomain, CFILE_NO_EXPORTS, "The config file does not specify any exports");
836 g_key_file_free(cfile);
841 * Signal handler for SIGCHLD
842 * @param s the signal we're handling (must be SIGCHLD, or something
845 void sigchld_handler(int s) {
850 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
851 if(WIFEXITED(status)) {
852 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
854 i=g_hash_table_lookup(children, &pid);
856 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
858 DEBUG2("Removing %d from the list of children", pid);
859 g_hash_table_remove(children, &pid);
865 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
868 * @param value the value corresponding to the above key
869 * @param user_data a pointer which we always set to 1, so that we know what
872 void killchild(gpointer key, gpointer value, gpointer user_data) {
874 int *parent=user_data;
881 * Handle SIGTERM and dispatch it to our children
882 * @param s the signal we're handling (must be SIGTERM, or something
883 * is severely wrong).
885 void sigterm_handler(int s) {
888 g_hash_table_foreach(children, killchild, &parent);
898 * Detect the size of a file.
900 * @param fhandle An open filedescriptor
901 * @return the size of the file, or OFFT_MAX if detection was
904 off_t size_autodetect(int fhandle) {
907 struct stat stat_buf;
910 #ifdef HAVE_SYS_MOUNT_H
911 #ifdef HAVE_SYS_IOCTL_H
913 DEBUG("looking for export size with ioctl BLKGETSIZE64\n");
914 if (!ioctl(fhandle, BLKGETSIZE64, &bytes) && bytes) {
917 #endif /* BLKGETSIZE64 */
918 #endif /* HAVE_SYS_IOCTL_H */
919 #endif /* HAVE_SYS_MOUNT_H */
921 DEBUG("looking for fhandle size with fstat\n");
922 stat_buf.st_size = 0;
923 error = fstat(fhandle, &stat_buf);
925 if(stat_buf.st_size > 0)
926 return (off_t)stat_buf.st_size;
928 err("fstat failed: %m");
931 DEBUG("looking for fhandle size with lseek SEEK_END\n");
932 es = lseek(fhandle, (off_t)0, SEEK_END);
933 if (es > ((off_t)0)) {
936 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
939 err("Could not find size of exported block device: %m");
944 * Get the file handle and offset, given an export offset.
946 * @param export An array of export files
947 * @param a The offset to get corresponding file/offset for
948 * @param fhandle [out] File descriptor
949 * @param foffset [out] Offset into fhandle
950 * @param maxbytes [out] Tells how many bytes can be read/written
951 * from fhandle starting at foffset (0 if there is no limit)
952 * @return 0 on success, -1 on failure
954 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
955 /* Negative offset not allowed */
959 /* Binary search for last file with starting offset <= a */
962 int end = export->len - 1;
963 while( start <= end ) {
964 int mid = (start + end) / 2;
965 fi = g_array_index(export, FILE_INFO, mid);
966 if( fi.startoff < a ) {
968 } else if( fi.startoff > a ) {
976 /* end should never go negative, since first startoff is 0 and a >= 0 */
979 fi = g_array_index(export, FILE_INFO, end);
980 *fhandle = fi.fhandle;
981 *foffset = a - fi.startoff;
983 if( end+1 < export->len ) {
984 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
985 *maxbytes = fi_next.startoff - a;
992 * seek to a position in a file, with error handling.
993 * @param handle a filedescriptor
994 * @param a position to seek to
995 * @todo get rid of this; lastpoint is a global variable right now, but it
996 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
999 void myseek(int handle,off_t a) {
1000 if (lseek(handle, a, SEEK_SET) < 0) {
1001 err("Can not seek locally!\n");
1006 * Write an amount of bytes at a given offset to the right file. This
1007 * abstracts the write-side of the multiple file option.
1009 * @param a The offset where the write should start
1010 * @param buf The buffer to write from
1011 * @param len The length of buf
1012 * @param client The client we're serving for
1013 * @return The number of bytes actually written, or -1 in case of an error
1015 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1021 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
1023 if(maxbytes && len > maxbytes)
1026 DEBUG4("(WRITE to fd %d offset %llu len %u), ", fhandle, foffset, len);
1028 myseek(fhandle, foffset);
1029 retval = write(fhandle, buf, len);
1030 if(client->server->flags & F_SYNC) {
1037 * Call rawexpwrite repeatedly until all data has been written.
1038 * @return 0 on success, nonzero on failure
1040 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
1043 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
1048 return (ret < 0 || len != 0);
1052 * Read an amount of bytes at a given offset from the right file. This
1053 * abstracts the read-side of the multiple files option.
1055 * @param a The offset where the read should start
1056 * @param buf A buffer to read into
1057 * @param len The size of buf
1058 * @param client The client we're serving for
1059 * @return The number of bytes actually read, or -1 in case of an
1062 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
1067 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
1069 if(maxbytes && len > maxbytes)
1072 DEBUG4("(READ from fd %d offset %llu len %u), ", fhandle, foffset, len);
1074 myseek(fhandle, foffset);
1075 return read(fhandle, buf, len);
1079 * Call rawexpread repeatedly until all data has been read.
1080 * @return 0 on success, nonzero on failure
1082 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
1085 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
1090 return (ret < 0 || len != 0);
1094 * Read an amount of bytes at a given offset from the right file. This
1095 * abstracts the read-side of the copyonwrite stuff, and calls
1096 * rawexpread() with the right parameters to do the actual work.
1097 * @param a The offset where the read should start
1098 * @param buf A buffer to read into
1099 * @param len The size of buf
1100 * @param client The client we're going to read for
1101 * @return 0 on success, nonzero on failure
1103 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
1104 off_t rdlen, offset;
1105 off_t mapcnt, mapl, maph, pagestart;
1107 if (!(client->server->flags & F_COPYONWRITE))
1108 return(rawexpread_fully(a, buf, len, client));
1109 DEBUG3("Asked to read %d bytes at %llu.\n", len, (unsigned long long)a);
1111 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
1113 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1114 pagestart=mapcnt*DIFFPAGESIZE;
1116 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1117 len : (size_t)DIFFPAGESIZE-offset;
1118 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1119 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1120 (unsigned long)(client->difmap[mapcnt]));
1121 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1122 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
1123 } else { /* the block is not there */
1124 DEBUG2("Page %llu is not here, we read the original one\n",
1125 (unsigned long long)mapcnt);
1126 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
1128 len-=rdlen; a+=rdlen; buf+=rdlen;
1134 * Write an amount of bytes at a given offset to the right file. This
1135 * abstracts the write-side of the copyonwrite option, and calls
1136 * rawexpwrite() with the right parameters to do the actual work.
1138 * @param a The offset where the write should start
1139 * @param buf The buffer to write from
1140 * @param len The length of buf
1141 * @param client The client we're going to write for.
1142 * @return 0 on success, nonzero on failure
1144 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1145 char pagebuf[DIFFPAGESIZE];
1146 off_t mapcnt,mapl,maph;
1151 if (!(client->server->flags & F_COPYONWRITE))
1152 return(rawexpwrite_fully(a, buf, len, client));
1153 DEBUG3("Asked to write %d bytes at %llu.\n", len, (unsigned long long)a);
1155 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1157 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1158 pagestart=mapcnt*DIFFPAGESIZE ;
1159 offset=a-pagestart ;
1160 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1161 len : (size_t)DIFFPAGESIZE-offset;
1163 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1164 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1165 (unsigned long)(client->difmap[mapcnt])) ;
1166 myseek(client->difffile,
1167 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1168 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1169 } else { /* the block is not there */
1170 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1171 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1172 DEBUG3("Page %llu is not here, we put it at %lu\n",
1173 (unsigned long long)mapcnt,
1174 (unsigned long)(client->difmap[mapcnt]));
1175 rdlen=DIFFPAGESIZE ;
1176 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1178 memcpy(pagebuf+offset,buf,wrlen) ;
1179 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1183 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1189 * Do the initial negotiation.
1191 * @param client The client we're negotiating with.
1193 void negotiate(CLIENT *client) {
1196 u32 flags = NBD_FLAG_HAS_FLAGS;
1198 memset(zeros, '\0', sizeof(zeros));
1199 if (write(client->net, INIT_PASSWD, 8) < 0)
1200 err("Negotiation failed: %m");
1201 cliserv_magic = htonll(cliserv_magic);
1202 if (write(client->net, &cliserv_magic, sizeof(cliserv_magic)) < 0)
1203 err("Negotiation failed: %m");
1204 size_host = htonll((u64)(client->exportsize));
1205 if (write(client->net, &size_host, 8) < 0)
1206 err("Negotiation failed: %m");
1207 if (client->server->flags & F_READONLY)
1208 flags |= NBD_FLAG_READ_ONLY;
1209 flags = htonl(flags);
1210 if (write(client->net, &flags, 4) < 0)
1211 err("Negotiation failed: %m");
1212 if (write(client->net, zeros, 124) < 0)
1213 err("Negotiation failed: %m");
1216 /** sending macro. */
1217 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1219 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1221 * Serve a file to a single client.
1223 * @todo This beast needs to be split up in many tiny little manageable
1224 * pieces. Preferably with a chainsaw.
1226 * @param client The client we're going to serve to.
1227 * @return when the client disconnects
1229 int mainloop(CLIENT *client) {
1230 struct nbd_request request;
1231 struct nbd_reply reply;
1232 gboolean go_on=TRUE;
1237 DEBUG("Entering request loop!\n");
1238 reply.magic = htonl(NBD_REPLY_MAGIC);
1247 readit(client->net, &request, sizeof(request));
1248 request.from = ntohll(request.from);
1249 request.type = ntohl(request.type);
1251 if (request.type==NBD_CMD_DISC) {
1252 msg2(LOG_INFO, "Disconnect request received.");
1253 if (client->server->flags & F_COPYONWRITE) {
1254 if (client->difmap) g_free(client->difmap) ;
1255 close(client->difffile);
1256 unlink(client->difffilename);
1257 free(client->difffilename);
1263 len = ntohl(request.len);
1265 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1266 err("Not enough magic.");
1267 if (len > BUFSIZE + sizeof(struct nbd_reply))
1268 err("Request too big!");
1270 printf("%s from %llu (%llu) len %d, ", request.type ? "WRITE" :
1271 "READ", (unsigned long long)request.from,
1272 (unsigned long long)request.from / 512, len);
1274 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1275 if ((request.from + len) > (OFFT_MAX)) {
1276 DEBUG("[Number too large!]");
1277 ERROR(client, reply, EINVAL);
1281 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1283 ERROR(client, reply, EINVAL);
1287 if (request.type==NBD_CMD_WRITE) {
1288 DEBUG("wr: net->buf, ");
1289 readit(client->net, buf, len);
1290 DEBUG("buf->exp, ");
1291 if ((client->server->flags & F_READONLY) ||
1292 (client->server->flags & F_AUTOREADONLY)) {
1293 DEBUG("[WRITE to READONLY!]");
1294 ERROR(client, reply, EPERM);
1297 if (expwrite(request.from, buf, len, client)) {
1298 DEBUG("Write failed: %m" );
1299 ERROR(client, reply, errno);
1302 SEND(client->net, reply);
1308 DEBUG("exp->buf, ");
1309 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1310 DEBUG("Read failed: %m");
1311 ERROR(client, reply, errno);
1315 DEBUG("buf->net, ");
1316 memcpy(buf, &reply, sizeof(struct nbd_reply));
1317 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1324 * Set up client export array, which is an array of FILE_INFO.
1325 * Also, split a single exportfile into multiple ones, if that was asked.
1326 * @param client information on the client which we want to setup export for
1328 void setupexport(CLIENT* client) {
1330 off_t laststartoff = 0, lastsize = 0;
1331 int multifile = (client->server->flags & F_MULTIFILE);
1333 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1335 /* If multi-file, open as many files as we can.
1336 * If not, open exactly one file.
1337 * Calculate file sizes as we go to get total size. */
1341 gchar* error_string;
1342 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1345 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1347 tmpname=g_strdup(client->exportname);
1349 DEBUG2( "Opening %s\n", tmpname );
1350 fi.fhandle = open(tmpname, mode);
1351 if(fi.fhandle == -1 && mode == O_RDWR) {
1352 /* Try again because maybe media was read-only */
1353 fi.fhandle = open(tmpname, O_RDONLY);
1354 if(fi.fhandle != -1) {
1355 /* Opening the base file in copyonwrite mode is
1357 if(!(client->server->flags & F_COPYONWRITE)) {
1358 client->server->flags |= F_AUTOREADONLY;
1359 client->server->flags |= F_READONLY;
1363 if(fi.fhandle == -1) {
1364 if(multifile && i>0)
1366 error_string=g_strdup_printf(
1367 "Could not open exported file %s: %%m",
1371 fi.startoff = laststartoff + lastsize;
1372 g_array_append_val(client->export, fi);
1375 /* Starting offset and size of this file will be used to
1376 * calculate starting offset of next file */
1377 laststartoff = fi.startoff;
1378 lastsize = size_autodetect(fi.fhandle);
1384 /* Set export size to total calculated size */
1385 client->exportsize = laststartoff + lastsize;
1387 /* Export size may be overridden */
1388 if(client->server->expected_size) {
1389 /* desired size must be <= total calculated size */
1390 if(client->server->expected_size > client->exportsize) {
1391 err("Size of exported file is too big\n");
1394 client->exportsize = client->server->expected_size;
1397 msg3(LOG_INFO, "Size of exported file/device is %llu", (unsigned long long)client->exportsize);
1399 msg3(LOG_INFO, "Total number of files: %d", i);
1403 int copyonwrite_prepare(CLIENT* client) {
1405 if ((client->difffilename = malloc(1024))==NULL)
1406 err("Failed to allocate string for diff file name");
1407 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1409 client->difffilename[1023]='\0';
1410 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1411 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1412 if (client->difffile<0) err("Could not create diff file (%m)") ;
1413 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1414 err("Could not allocate memory") ;
1415 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1421 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1424 * @param command the command to be ran. Read from the config file
1425 * @param file the file name we're about to export
1427 int do_run(gchar* command, gchar* file) {
1431 if(command && *command) {
1432 cmd = g_strdup_printf(command, file);
1440 * Serve a connection.
1442 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1443 * follow the road map.
1445 * @param client a connected client
1447 void serveconnection(CLIENT *client) {
1448 if(do_run(client->server->prerun, client->exportname)) {
1451 setupexport(client);
1453 if (client->server->flags & F_COPYONWRITE) {
1454 copyonwrite_prepare(client);
1457 setmysockopt(client->net);
1460 do_run(client->server->postrun, client->exportname);
1464 * Find the name of the file we have to serve. This will use g_strdup_printf
1465 * to put the IP address of the client inside a filename containing
1466 * "%s" (in the form as specified by the "virtstyle" option). That name
1467 * is then written to client->exportname.
1469 * @param net A socket connected to an nbd client
1470 * @param client information about the client. The IP address in human-readable
1471 * format will be written to a new char* buffer, the address of which will be
1472 * stored in client->clientname.
1474 void set_peername(int net, CLIENT *client) {
1475 struct sockaddr_storage addrin;
1476 struct sockaddr_storage netaddr;
1477 struct sockaddr_in *netaddr4 = NULL;
1478 struct sockaddr_in6 *netaddr6 = NULL;
1479 size_t addrinlen = sizeof( addrin );
1480 struct addrinfo hints;
1481 struct addrinfo *ai = NULL;
1482 char peername[NI_MAXHOST];
1483 char netname[NI_MAXHOST];
1489 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1490 err("getsockname failed: %m");
1492 getnameinfo((struct sockaddr *)&addrin, (socklen_t)addrinlen,
1493 peername, sizeof (peername), NULL, 0, NI_NUMERICHOST);
1495 memset(&hints, '\0', sizeof (hints));
1496 hints.ai_flags = AI_ADDRCONFIG;
1497 e = getaddrinfo(peername, NULL, &hints, &ai);
1500 fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
1505 switch(client->server->virtstyle) {
1507 client->exportname=g_strdup(client->server->exportname);
1510 for(i=0;i<strlen(peername);i++) {
1511 if(peername[i]=='.') {
1516 client->exportname=g_strdup_printf(client->server->exportname, peername);
1519 memcpy(&netaddr, &addrin, addrinlen);
1520 if(ai->ai_family == AF_INET) {
1521 netaddr4 = (struct sockaddr_in *)&netaddr;
1522 (netaddr4->sin_addr).s_addr>>=32-(client->server->cidrlen);
1523 (netaddr4->sin_addr).s_addr<<=32-(client->server->cidrlen);
1525 getnameinfo((struct sockaddr *) netaddr4, (socklen_t) addrinlen,
1526 netname, sizeof (netname), NULL, 0, NI_NUMERICHOST);
1527 tmp=g_strdup_printf("%s/%s", netname, peername);
1528 }else if(ai->ai_family == AF_INET6) {
1529 netaddr6 = (struct sockaddr_in6 *)&netaddr;
1531 shift = 128-(client->server->cidrlen);
1533 while(shift >= 32) {
1534 ((netaddr6->sin6_addr).s6_addr32[i])=0;
1538 (netaddr6->sin6_addr).s6_addr32[i]>>=shift;
1539 (netaddr6->sin6_addr).s6_addr32[i]<<=shift;
1541 getnameinfo((struct sockaddr *)netaddr6, (socklen_t)addrinlen,
1542 netname, sizeof(netname), NULL, 0, NI_NUMERICHOST);
1543 tmp=g_strdup_printf("%s/%s", netname, peername);
1547 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1553 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1554 peername, client->exportname);
1555 client->clientname=g_strdup(peername);
1560 * @param data a pointer to pid_t which should be freed
1562 void destroy_pid_t(gpointer data) {
1567 * Loop through the available servers, and serve them. Never returns.
1569 int serveloop(GArray* servers) {
1570 struct sockaddr_storage addrin;
1571 socklen_t addrinlen=sizeof(addrin);
1580 * Set up the master fd_set. The set of descriptors we need
1581 * to select() for never changes anyway and it buys us a *lot*
1582 * of time to only build this once. However, if we ever choose
1583 * to not fork() for clients anymore, we may have to revisit
1588 for(i=0;i<servers->len;i++) {
1589 sock=(g_array_index(servers, SERVER, i)).socket;
1590 FD_SET(sock, &mset);
1591 max=sock>max?sock:max;
1598 memcpy(&rset, &mset, sizeof(fd_set));
1599 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1601 for(i=0;i<servers->len;i++) {
1602 serve=&(g_array_index(servers, SERVER, i));
1603 if(FD_ISSET(serve->socket, &rset)) {
1605 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1608 if((sock_flags = fcntl(net, F_GETFL, 0))==-1) {
1609 err("fcntl F_GETFL");
1611 if(fcntl(net, F_SETFL, sock_flags &~O_NONBLOCK)==-1) {
1612 err("fcntl F_SETFL ~O_NONBLOCK");
1614 client = g_malloc(sizeof(CLIENT));
1615 client->server=serve;
1616 client->exportsize=OFFT_MAX;
1618 set_peername(net, client);
1619 if (!authorized_client(client)) {
1620 msg2(LOG_INFO,"Unauthorized client") ;
1624 msg2(LOG_INFO,"Authorized client") ;
1625 pid=g_malloc(sizeof(pid_t));
1627 if ((*pid=fork())<0) {
1628 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1632 if (*pid>0) { /* parent */
1634 g_hash_table_insert(children, pid, pid);
1638 g_hash_table_destroy(children);
1639 for(i=0;i<servers->len;i++) {
1640 serve=&g_array_index(servers, SERVER, i);
1641 close(serve->socket);
1643 /* FALSE does not free the
1644 actual data. This is required,
1645 because the client has a
1646 direct reference into that
1647 data, and otherwise we get a
1649 g_array_free(servers, FALSE);
1651 msg2(LOG_INFO,"Starting to serve");
1652 serveconnection(client);
1661 * Connect a server's socket.
1663 * @param serve the server we want to connect.
1665 void setup_serve(SERVER *serve) {
1666 struct addrinfo hints;
1667 struct addrinfo *ai = NULL;
1668 struct sigaction sa;
1678 memset(&hints,'\0',sizeof(hints));
1679 hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG | AI_NUMERICSERV;
1680 hints.ai_socktype = SOCK_STREAM;
1681 hints.ai_family = serve->socket_family;
1683 port = g_strdup_printf ("%d", serve->port);
1687 e = getaddrinfo(serve->listenaddr,port,&hints,&ai);
1692 fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
1698 if(serve->socket_family == AF_UNSPEC)
1699 serve->socket_family = ai->ai_family;
1702 if ((serve->flags) && F_SDP) {
1703 if (ai->ai_family == AF_INET)
1704 ai->ai_family = AF_INET_SDP;
1705 else (ai->ai_family == AF_INET6)
1706 ai->ai_family = AF_INET6_SDP;
1709 if ((serve->socket = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0)
1712 /* lose the pesky "Address already in use" error message */
1713 if (setsockopt(serve->socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1714 err("setsockopt SO_REUSEADDR");
1716 if (setsockopt(serve->socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1717 err("setsockopt SO_KEEPALIVE");
1720 /* make the listening socket non-blocking */
1721 if ((sock_flags = fcntl(serve->socket, F_GETFL, 0)) == -1) {
1722 err("fcntl F_GETFL");
1724 if (fcntl(serve->socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1725 err("fcntl F_SETFL O_NONBLOCK");
1728 DEBUG("Waiting for connections... bind, ");
1729 e = bind(serve->socket, ai->ai_addr, ai->ai_addrlen);
1730 if (e != 0 && errno != EADDRINUSE)
1733 if (listen(serve->socket, 1) < 0)
1738 sa.sa_handler = sigchld_handler;
1739 sigemptyset(&sa.sa_mask);
1740 sa.sa_flags = SA_RESTART;
1741 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1742 err("sigaction: %m");
1743 sa.sa_handler = sigterm_handler;
1744 sigemptyset(&sa.sa_mask);
1745 sa.sa_flags = SA_RESTART;
1746 if(sigaction(SIGTERM, &sa, NULL) == -1)
1747 err("sigaction: %m");
1751 * Connect our servers.
1753 void setup_servers(GArray* servers) {
1756 for(i=0;i<servers->len;i++) {
1757 setup_serve(&(g_array_index(servers, SERVER, i)));
1759 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1763 * Go daemon (unless we specified at compile time that we didn't want this)
1764 * @param serve the first server of our configuration. If its port is zero,
1765 * then do not daemonize, because we're doing inetd then. This parameter
1766 * is only used to create a PID file of the form
1767 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1769 #if !defined(NODAEMON) && !defined(NOFORK)
1770 void daemonize(SERVER* serve) {
1773 if(serve && !(serve->port)) {
1779 if(!*pidftemplate) {
1781 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1783 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1786 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1787 pidf=fopen(pidfname, "w");
1789 fprintf(pidf,"%d\n", (int)getpid());
1793 fprintf(stderr, "Not fatal; continuing");
1797 #define daemonize(serve)
1798 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1801 * Everything beyond this point (in the file) is run in non-daemon mode.
1802 * The stuff above daemonize() isn't.
1805 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1807 void serve_err(SERVER* serve, const char* msg) {
1808 g_message("Export of %s on port %d failed:", serve->exportname,
1814 * Set up user-ID and/or group-ID
1816 void dousers(void) {
1821 gr=getgrnam(rungroup);
1823 str = g_strdup_printf("Invalid group name: %s", rungroup);
1826 if(setgid(gr->gr_gid)<0) {
1827 err("Could not set GID: %m");
1831 pw=getpwnam(runuser);
1833 str = g_strdup_printf("Invalid user name: %s", runuser);
1836 if(setuid(pw->pw_uid)<0) {
1837 err("Could not set UID: %m");
1843 void glib_message_syslog_redirect(const gchar *log_domain,
1844 GLogLevelFlags log_level,
1845 const gchar *message,
1848 int level=LOG_DEBUG;
1852 case G_LOG_FLAG_FATAL:
1853 case G_LOG_LEVEL_CRITICAL:
1854 case G_LOG_LEVEL_ERROR:
1857 case G_LOG_LEVEL_WARNING:
1860 case G_LOG_LEVEL_MESSAGE:
1861 case G_LOG_LEVEL_INFO:
1864 case G_LOG_LEVEL_DEBUG:
1869 syslog(level, message);
1874 * Main entry point...
1876 int main(int argc, char *argv[]) {
1881 if (sizeof( struct nbd_request )!=28) {
1882 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
1883 exit(EXIT_FAILURE) ;
1886 memset(pidftemplate, '\0', 256);
1889 config_file_pos = g_strdup(CFILE);
1890 serve=cmdline(argc, argv);
1891 servers = parse_cfile(config_file_pos, &err);
1894 serve->socket_family = AF_UNSPEC;
1896 append_serve(serve, servers);
1898 if (!(serve->port)) {
1901 /* You really should define ISSERVER if you're going to use
1902 * inetd mode, but if you don't, closing stdout and stderr
1903 * (which inetd had connected to the client socket) will let it
1907 open("/dev/null", O_WRONLY);
1908 open("/dev/null", O_WRONLY);
1909 g_log_set_default_handler( glib_message_syslog_redirect, NULL );
1911 client=g_malloc(sizeof(CLIENT));
1912 client->server=serve;
1914 client->exportsize=OFFT_MAX;
1915 set_peername(0,client);
1916 serveconnection(client);
1921 if(!servers || !servers->len) {
1922 g_warning("Could not parse config file: %s",
1923 err ? err->message : "Unknown error");
1926 g_warning("Specifying an export on the command line is deprecated.");
1927 g_warning("Please use a configuration file instead.");
1930 if((!serve) && (!servers||!servers->len)) {
1931 g_message("Nothing to do! Bye!");
1935 setup_servers(servers);