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"
100 #include <sdp_inet.h>
103 /** Default position of the config file */
105 #define SYSCONFDIR "/etc"
107 #define CFILE SYSCONFDIR "/nbd-server/config"
109 /** Where our config file actually is */
110 gchar* config_file_pos;
112 /** What user we're running as */
114 /** What group we're running as */
115 gchar* rungroup=NULL;
116 /** whether to export using the old negotiation protocol (port-based) */
117 gboolean do_oldstyle=FALSE;
119 /** Logging macros, now nothing goes to syslog unless you say ISSERVER */
121 #define msg2(a,b) syslog(a,b)
122 #define msg3(a,b,c) syslog(a,b,c)
123 #define msg4(a,b,c,d) syslog(a,b,c,d)
125 #define msg2(a,b) g_message(b)
126 #define msg3(a,b,c) g_message(b,c)
127 #define msg4(a,b,c,d) g_message(b,c,d)
130 /* Debugging macros */
133 #define DEBUG( a ) printf( a )
134 #define DEBUG2( a,b ) printf( a,b )
135 #define DEBUG3( a,b,c ) printf( a,b,c )
136 #define DEBUG4( a,b,c,d ) printf( a,b,c,d )
139 #define DEBUG2( a,b )
140 #define DEBUG3( a,b,c )
141 #define DEBUG4( a,b,c,d )
143 #ifndef PACKAGE_VERSION
144 #define PACKAGE_VERSION ""
147 * The highest value a variable of type off_t can reach. This is a signed
148 * integer, so set all bits except for the leftmost one.
150 #define OFFT_MAX ~((off_t)1<<(sizeof(off_t)*8-1))
151 #define LINELEN 256 /**< Size of static buffer used to read the
152 authorization file (yuck) */
153 #define BUFSIZE (1024*1024) /**< Size of buffer that can hold requests */
154 #define DIFFPAGESIZE 4096 /**< diff file uses those chunks */
155 #define F_READONLY 1 /**< flag to tell us a file is readonly */
156 #define F_MULTIFILE 2 /**< flag to tell us a file is exported using -m */
157 #define F_COPYONWRITE 4 /**< flag to tell us a file is exported using
159 #define F_AUTOREADONLY 8 /**< flag to tell us a file is set to autoreadonly */
160 #define F_SPARSE 16 /**< flag to tell us copyronwrite should use a sparse file */
161 #define F_SDP 32 /**< flag to tell us the export should be done using the Socket Direct Protocol for RDMA */
162 #define F_SYNC 64 /**< Whether to fsync() after a write */
163 GHashTable *children;
164 char pidfname[256]; /**< name of our PID file */
165 char pidftemplate[256]; /**< template to be used for the filename of the PID file */
166 char default_authname[] = SYSCONFDIR "/nbd-server/allow"; /**< default name of allow file */
168 int modernsock=0; /**< Socket for the modern handler. Not used
169 if a client was only specified on the
170 command line; only port used if
171 oldstyle is set to false (and then the
172 command-line client isn't used, gna gna) */
173 char* modern_listen; /**< listenaddr value for modernsock */
176 * Types of virtuatlization
179 VIRT_NONE=0, /**< No virtualization */
180 VIRT_IPLIT, /**< Literal IP address as part of the filename */
181 VIRT_IPHASH, /**< Replacing all dots in an ip address by a / before
182 doing the same as in IPLIT */
183 VIRT_CIDR, /**< Every subnet in its own directory */
187 * Variables associated with a server.
190 gchar* exportname; /**< (unprocessed) filename of the file we're exporting */
191 off_t expected_size; /**< size of the exported file as it was told to
192 us through configuration */
193 gchar* listenaddr; /**< The IP address we're listening on */
194 unsigned int port; /**< port we're exporting this file at */
195 char* authname; /**< filename of the authorization file */
196 int flags; /**< flags associated with this exported file */
197 int socket; /**< The socket of this server. */
198 int socket_family; /**< family of the socket */
199 VIRT_STYLE virtstyle;/**< The style of virtualization, if any */
200 uint8_t cidrlen; /**< The length of the mask when we use
201 CIDR-style virtualization */
202 gchar* prerun; /**< command to be ran after connecting a client,
203 but before starting to serve */
204 gchar* postrun; /**< command that will be ran after the client
206 gchar* servename; /**< name of the export as selected by nbd-client */
210 * Variables associated with a client socket.
213 int fhandle; /**< file descriptor */
214 off_t startoff; /**< starting offset of this file */
218 off_t exportsize; /**< size of the file we're exporting */
219 char *clientname; /**< peer */
220 char *exportname; /**< (processed) filename of the file we're exporting */
221 GArray *export; /**< array of FILE_INFO of exported files;
222 array size is always 1 unless we're
223 doing the multiple file option */
224 int net; /**< The actual client socket */
225 SERVER *server; /**< The server this client is getting data from */
226 char* difffilename; /**< filename of the copy-on-write file, if any */
227 int difffile; /**< filedescriptor of copyonwrite file. @todo
228 shouldn't this be an array too? (cfr export) Or
229 make -m and -c mutually exclusive */
230 u32 difffilelen; /**< number of pages in difffile */
231 u32 *difmap; /**< see comment on the global difmap for this one */
232 gboolean modern; /**< client was negotiated using modern negotiation protocol */
236 * Type of configuration file values
239 PARAM_INT, /**< This parameter is an integer */
240 PARAM_STRING, /**< This parameter is a string */
241 PARAM_BOOL, /**< This parameter is a boolean */
245 * Configuration file values
248 gchar *paramname; /**< Name of the parameter, as it appears in
250 gboolean required; /**< Whether this is a required (as opposed to
251 optional) parameter */
252 PARAM_TYPE ptype; /**< Type of the parameter. */
253 gpointer target; /**< Pointer to where the data of this
254 parameter should be written. If ptype is
255 PARAM_BOOL, the data is or'ed rather than
257 gint flagval; /**< Flag mask for this parameter in case ptype
262 * Check whether a client is allowed to connect. Works with an authorization
263 * file which contains one line per machine, no wildcards.
265 * @param opts The client who's trying to connect.
266 * @return 0 - authorization refused, 1 - OK
268 int authorized_client(CLIENT *opts) {
269 const char *ERRMSG="Invalid entry '%s' in authfile '%s', so, refusing all connections.";
274 struct in_addr client;
275 struct in_addr cltemp;
278 if ((f=fopen(opts->server->authname,"r"))==NULL) {
279 msg4(LOG_INFO,"Can't open authorization file %s (%s).",
280 opts->server->authname,strerror(errno)) ;
284 inet_aton(opts->clientname, &client);
285 while (fgets(line,LINELEN,f)!=NULL) {
286 if((tmp=index(line, '/'))) {
287 if(strlen(line)<=tmp-line) {
288 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
292 if(!inet_aton(line,&addr)) {
293 msg4(LOG_CRIT, ERRMSG, line, opts->server->authname);
296 len=strtol(tmp, NULL, 0);
297 addr.s_addr>>=32-len;
298 addr.s_addr<<=32-len;
299 memcpy(&cltemp,&client,sizeof(client));
300 cltemp.s_addr>>=32-len;
301 cltemp.s_addr<<=32-len;
302 if(addr.s_addr == cltemp.s_addr) {
306 if (strncmp(line,opts->clientname,strlen(opts->clientname))==0) {
316 * Read data from a file descriptor into a buffer
318 * @param f a file descriptor
319 * @param buf a buffer
320 * @param len the number of bytes to be read
322 inline void readit(int f, void *buf, size_t len) {
326 if ((res = read(f, buf, len)) <= 0) {
327 if(errno != EAGAIN) {
328 err("Read failed: %m");
338 * Write data from a buffer into a filedescriptor
340 * @param f a file descriptor
341 * @param buf a buffer containing data
342 * @param len the number of bytes to be written
344 inline void writeit(int f, void *buf, size_t len) {
348 if ((res = write(f, buf, len)) <= 0)
349 err("Send failed: %m");
356 * Print out a message about how to use nbd-server. Split out to a separate
357 * function so that we can call it from multiple places
360 printf("This is nbd-server version " VERSION "\n");
361 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"
362 "\t-r|--read-only\t\tread only\n"
363 "\t-m|--multi-file\t\tmultiple file\n"
364 "\t-c|--copy-on-write\tcopy on write\n"
365 "\t-C|--config-file\tspecify an alternate configuration file\n"
366 "\t-l|--authorize-file\tfile with list of hosts that are allowed to\n\t\t\t\tconnect.\n"
367 "\t-p|--pid-file\t\tspecify a filename to write our PID to\n"
368 "\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"
369 "\tif port is set to 0, stdin is used (for running from inetd)\n"
370 "\tif file_to_export contains '%%s', it is substituted with the IP\n"
371 "\t\taddress of the machine trying to connect\n"
372 "\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");
373 printf("Using configuration file %s\n", CFILE);
376 /* Dumps a config file section of the given SERVER*, and exits. */
377 void dump_section(SERVER* serve, gchar* section_header) {
378 printf("[%s]\n", section_header);
379 printf("\texportname = %s\n", serve->exportname);
380 printf("\tlistenaddr = %s\n", serve->listenaddr);
381 printf("\tport = %d\n", serve->port);
382 if(serve->flags & F_READONLY) {
383 printf("\treadonly = true\n");
385 if(serve->flags & F_MULTIFILE) {
386 printf("\tmultifile = true\n");
388 if(serve->flags & F_COPYONWRITE) {
389 printf("\tcopyonwrite = true\n");
391 if(serve->expected_size) {
392 printf("\tfilesize = %lld\n", (long long int)serve->expected_size);
394 if(serve->authname) {
395 printf("\tauthfile = %s\n", serve->authname);
401 * Parse the command line.
403 * @param argc the argc argument to main()
404 * @param argv the argv argument to main()
406 SERVER* cmdline(int argc, char *argv[]) {
410 struct option long_options[] = {
411 {"read-only", no_argument, NULL, 'r'},
412 {"multi-file", no_argument, NULL, 'm'},
413 {"copy-on-write", no_argument, NULL, 'c'},
414 {"authorize-file", required_argument, NULL, 'l'},
415 {"config-file", required_argument, NULL, 'C'},
416 {"pid-file", required_argument, NULL, 'p'},
417 {"output-config", required_argument, NULL, 'o'},
424 gboolean do_output=FALSE;
425 gchar* section_header="";
431 serve=g_new0(SERVER, 1);
432 serve->authname = g_strdup(default_authname);
433 serve->virtstyle=VIRT_IPLIT;
434 while((c=getopt_long(argc, argv, "-C:cl:mo:rp:", long_options, &i))>=0) {
437 /* non-option argument */
438 switch(nonspecial++) {
440 if(strchr(optarg, ':') == strrchr(optarg, ':')) {
441 addr_port=g_strsplit(optarg, ":", 2);
443 /* Check for "@" - maybe user using this separator
446 g_strfreev(addr_port);
447 addr_port=g_strsplit(optarg, "@", 2);
450 addr_port=g_strsplit(optarg, "@", 2);
454 serve->port=strtol(addr_port[1], NULL, 0);
455 serve->listenaddr=g_strdup(addr_port[0]);
457 serve->listenaddr=NULL;
458 serve->port=strtol(addr_port[0], NULL, 0);
460 g_strfreev(addr_port);
463 serve->exportname = g_strdup(optarg);
464 if(serve->exportname[0] != '/') {
465 fprintf(stderr, "E: The to be exported file needs to be an absolute filename!\n");
470 last=strlen(optarg)-1;
472 if (suffix == 'k' || suffix == 'K' ||
473 suffix == 'm' || suffix == 'M')
475 es = (off_t)atoll(optarg);
483 serve->expected_size = es;
488 serve->flags |= F_READONLY;
491 serve->flags |= F_MULTIFILE;
495 section_header = g_strdup(optarg);
498 strncpy(pidftemplate, optarg, 256);
501 serve->flags |=F_COPYONWRITE;
504 g_free(config_file_pos);
505 config_file_pos=g_strdup(optarg);
508 g_free(serve->authname);
509 serve->authname=g_strdup(optarg);
517 /* What's left: the port to export, the name of the to be exported
518 * file, and, optionally, the size of the file, in that order. */
527 g_critical("Need a complete configuration on the command line to output a config file section!");
530 dump_section(serve, section_header);
536 * Error codes for config file parsing
539 CFILE_NOTFOUND, /**< The configuration file is not found */
540 CFILE_MISSING_GENERIC, /**< The (required) group "generic" is missing */
541 CFILE_KEY_MISSING, /**< A (required) key is missing */
542 CFILE_VALUE_INVALID, /**< A value is syntactically invalid */
543 CFILE_VALUE_UNSUPPORTED,/**< A value is not supported in this build */
544 CFILE_PROGERR, /**< Programmer error */
545 CFILE_NO_EXPORTS, /**< A config file was specified that does not
546 define any exports */
547 CFILE_INCORRECT_PORT, /**< The reserved port was specified for an
552 * Remove a SERVER from memory. Used from the hash table
554 void remove_server(gpointer s) {
558 g_free(server->exportname);
560 g_free(server->authname);
561 if(server->listenaddr)
562 g_free(server->listenaddr);
564 g_free(server->prerun);
566 g_free(server->postrun);
572 * @param s the old server we want to duplicate
573 * @return new duplicated server
575 SERVER* dup_serve(SERVER *s) {
576 SERVER *serve = NULL;
578 serve=g_new0(SERVER, 1);
583 serve->exportname = g_strdup(s->exportname);
585 serve->expected_size = s->expected_size;
588 serve->listenaddr = g_strdup(s->listenaddr);
590 serve->port = s->port;
593 serve->authname = strdup(s->authname);
595 serve->flags = s->flags;
596 serve->socket = serve->socket;
597 serve->socket_family = serve->socket_family;
598 serve->cidrlen = s->cidrlen;
601 serve->prerun = g_strdup(s->prerun);
604 serve->postrun = g_strdup(s->postrun);
607 serve->servename = g_strdup(s->servename);
613 * append new server to array
615 * @param a server array
616 * @return 0 success, -1 error
618 int append_serve(SERVER *s, GArray *a) {
620 struct addrinfo hints;
621 struct addrinfo *ai = NULL;
622 struct addrinfo *rp = NULL;
623 char host[NI_MAXHOST];
629 err("Invalid parsing server");
633 port = g_strdup_printf("%d", s->port);
635 memset(&hints,'\0',sizeof(hints));
636 hints.ai_family = AF_UNSPEC;
637 hints.ai_socktype = SOCK_STREAM;
638 hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
639 hints.ai_protocol = IPPROTO_TCP;
641 e = getaddrinfo(s->listenaddr, port, &hints, &ai);
647 for (rp = ai; rp != NULL; rp = rp->ai_next) {
648 e = getnameinfo(rp->ai_addr, rp->ai_addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST);
650 if (e != 0) { // error
651 fprintf(stderr, "getnameinfo: %s\n", gai_strerror(e));
655 // duplicate server and set listenaddr to resolved IP address
658 ns->listenaddr = g_strdup(host);
659 ns->socket_family = rp->ai_family;
660 g_array_append_val(a, *ns);
668 fprintf(stderr, "getaddrinfo failed on listen host/address: %s (%s)\n", s->listenaddr ? s->listenaddr : "any", gai_strerror(e));
679 * Parse the config file.
681 * @param f the name of the config file
682 * @param e a GError. @see CFILE_ERRORS for what error values this function can
684 * @return a Array of SERVER* pointers, If the config file is empty or does not
685 * exist, returns an empty GHashTable; if the config file contains an
686 * error, returns NULL, and e is set appropriately
688 GArray* parse_cfile(gchar* f, GError** e) {
689 const char* DEFAULT_ERROR = "Could not parse %s in group %s: %s";
690 const char* MISSING_REQUIRED_ERROR = "Could not find required value %s in group %s: %s";
692 gchar *virtstyle=NULL;
694 { "exportname", TRUE, PARAM_STRING, NULL, 0 },
695 { "port", TRUE, PARAM_INT, NULL, 0 },
696 { "authfile", FALSE, PARAM_STRING, NULL, 0 },
697 { "filesize", FALSE, PARAM_INT, NULL, 0 },
698 { "virtstyle", FALSE, PARAM_STRING, NULL, 0 },
699 { "prerun", FALSE, PARAM_STRING, NULL, 0 },
700 { "postrun", FALSE, PARAM_STRING, NULL, 0 },
701 { "readonly", FALSE, PARAM_BOOL, NULL, F_READONLY },
702 { "multifile", FALSE, PARAM_BOOL, NULL, F_MULTIFILE },
703 { "copyonwrite", FALSE, PARAM_BOOL, NULL, F_COPYONWRITE },
704 { "sparse_cow", FALSE, PARAM_BOOL, NULL, F_SPARSE },
705 { "sdp", FALSE, PARAM_BOOL, NULL, F_SDP },
706 { "sync", FALSE, PARAM_BOOL, NULL, F_SYNC },
707 { "listenaddr", FALSE, PARAM_STRING, NULL, 0 },
709 const int lp_size=sizeof(lp)/sizeof(PARAM);
711 { "user", FALSE, PARAM_STRING, &runuser, 0 },
712 { "group", FALSE, PARAM_STRING, &rungroup, 0 },
713 { "oldstyle", FALSE, PARAM_BOOL, &do_oldstyle, 1 },
714 { "listenaddr", FALSE, PARAM_STRING, &modern_listen, 0 },
717 int p_size=sizeof(gp)/sizeof(PARAM);
720 const char *err_msg=NULL;
729 errdomain = g_quark_from_string("parse_cfile");
730 cfile = g_key_file_new();
731 retval = g_array_new(FALSE, TRUE, sizeof(SERVER));
732 if(!g_key_file_load_from_file(cfile, f, G_KEY_FILE_KEEP_COMMENTS |
733 G_KEY_FILE_KEEP_TRANSLATIONS, &err)) {
734 g_set_error(e, errdomain, CFILE_NOTFOUND, "Could not open config file %s.", f);
735 g_key_file_free(cfile);
738 startgroup = g_key_file_get_start_group(cfile);
739 if(!startgroup || strcmp(startgroup, "generic")) {
740 g_set_error(e, errdomain, CFILE_MISSING_GENERIC, "Config file does not contain the [generic] group!");
741 g_key_file_free(cfile);
744 groups = g_key_file_get_groups(cfile, NULL);
745 for(i=0;groups[i];i++) {
746 memset(&s, '\0', sizeof(SERVER));
747 lp[0].target=&(s.exportname);
748 lp[1].target=&(s.port);
749 lp[2].target=&(s.authname);
750 lp[3].target=&(s.expected_size);
751 lp[4].target=&(virtstyle);
752 lp[5].target=&(s.prerun);
753 lp[6].target=&(s.postrun);
754 lp[7].target=lp[8].target=lp[9].target=
755 lp[10].target=lp[11].target=
756 lp[12].target=&(s.flags);
757 lp[13].target=&(s.listenaddr);
759 /* After the [generic] group, start parsing exports */
764 for(j=0;j<p_size;j++) {
765 g_assert(p[j].target != NULL);
766 g_assert(p[j].ptype==PARAM_INT||p[j].ptype==PARAM_STRING||p[j].ptype==PARAM_BOOL);
769 *((gint*)p[j].target) =
770 g_key_file_get_integer(cfile,
776 *((gchar**)p[j].target) =
777 g_key_file_get_string(cfile,
783 value = g_key_file_get_boolean(cfile,
785 p[j].paramname, &err);
788 *((gint*)p[j].target) |= p[j].flagval;
790 *((gint*)p[j].target) &= ~(p[j].flagval);
795 if(!strcmp(p[j].paramname, "port") && !strcmp(p[j].target, NBD_DEFAULT_PORT)) {
796 g_set_error(e, errdomain, CFILE_INCORRECT_PORT, "Config file specifies default port for oldstyle export");
797 g_key_file_free(cfile);
801 if(err->code == G_KEY_FILE_ERROR_KEY_NOT_FOUND) {
803 /* Ignore not-found error for optional values */
807 err_msg = MISSING_REQUIRED_ERROR;
810 err_msg = DEFAULT_ERROR;
812 g_set_error(e, errdomain, CFILE_VALUE_INVALID, err_msg, p[j].paramname, groups[i], err->message);
813 g_array_free(retval, TRUE);
815 g_key_file_free(cfile);
820 if(!strncmp(virtstyle, "none", 4)) {
821 s.virtstyle=VIRT_NONE;
822 } else if(!strncmp(virtstyle, "ipliteral", 9)) {
823 s.virtstyle=VIRT_IPLIT;
824 } else if(!strncmp(virtstyle, "iphash", 6)) {
825 s.virtstyle=VIRT_IPHASH;
826 } else if(!strncmp(virtstyle, "cidrhash", 8)) {
827 s.virtstyle=VIRT_CIDR;
828 if(strlen(virtstyle)<10) {
829 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s: missing length", virtstyle, groups[i]);
830 g_array_free(retval, TRUE);
831 g_key_file_free(cfile);
834 s.cidrlen=strtol(virtstyle+8, NULL, 0);
836 g_set_error(e, errdomain, CFILE_VALUE_INVALID, "Invalid value %s for parameter virtstyle in group %s", virtstyle, groups[i]);
837 g_array_free(retval, TRUE);
838 g_key_file_free(cfile);
841 if(s.port && !do_oldstyle) {
842 g_warning("A port was specified, but oldstyle exports were not requested. This may not do what you expect.");
843 g_warning("Please read 'man 5 nbd-server' and search for oldstyle for more info");
846 s.virtstyle=VIRT_IPLIT;
848 /* Don't need to free this, it's not our string */
850 /* Don't append values for the [generic] group */
852 s.socket_family = AF_UNSPEC;
853 s.servename = groups[i];
855 append_serve(&s, retval);
862 if(s.flags & F_SDP) {
863 g_set_error(e, errdomain, CFILE_VALUE_UNSUPPORTED, "This nbd-server was built without support for SDP, yet group %s uses it", groups[i]);
864 g_array_free(retval, TRUE);
865 g_key_file_free(cfile);
871 g_set_error(e, errdomain, CFILE_NO_EXPORTS, "The config file does not specify any exports");
873 g_key_file_free(cfile);
878 * Signal handler for SIGCHLD
879 * @param s the signal we're handling (must be SIGCHLD, or something
882 void sigchld_handler(int s) {
887 while((pid=waitpid(-1, &status, WNOHANG)) > 0) {
888 if(WIFEXITED(status)) {
889 msg3(LOG_INFO, "Child exited with %d", WEXITSTATUS(status));
891 i=g_hash_table_lookup(children, &pid);
893 msg3(LOG_INFO, "SIGCHLD received for an unknown child with PID %ld", (long)pid);
895 DEBUG2("Removing %d from the list of children", pid);
896 g_hash_table_remove(children, &pid);
902 * Kill a child. Called from sigterm_handler::g_hash_table_foreach.
905 * @param value the value corresponding to the above key
906 * @param user_data a pointer which we always set to 1, so that we know what
909 void killchild(gpointer key, gpointer value, gpointer user_data) {
911 int *parent=user_data;
918 * Handle SIGTERM and dispatch it to our children
919 * @param s the signal we're handling (must be SIGTERM, or something
920 * is severely wrong).
922 void sigterm_handler(int s) {
925 g_hash_table_foreach(children, killchild, &parent);
935 * Detect the size of a file.
937 * @param fhandle An open filedescriptor
938 * @return the size of the file, or OFFT_MAX if detection was
941 off_t size_autodetect(int fhandle) {
944 struct stat stat_buf;
947 #ifdef HAVE_SYS_MOUNT_H
948 #ifdef HAVE_SYS_IOCTL_H
950 DEBUG("looking for export size with ioctl BLKGETSIZE64\n");
951 if (!ioctl(fhandle, BLKGETSIZE64, &bytes) && bytes) {
954 #endif /* BLKGETSIZE64 */
955 #endif /* HAVE_SYS_IOCTL_H */
956 #endif /* HAVE_SYS_MOUNT_H */
958 DEBUG("looking for fhandle size with fstat\n");
959 stat_buf.st_size = 0;
960 error = fstat(fhandle, &stat_buf);
962 if(stat_buf.st_size > 0)
963 return (off_t)stat_buf.st_size;
965 err("fstat failed: %m");
968 DEBUG("looking for fhandle size with lseek SEEK_END\n");
969 es = lseek(fhandle, (off_t)0, SEEK_END);
970 if (es > ((off_t)0)) {
973 DEBUG2("lseek failed: %d", errno==EBADF?1:(errno==ESPIPE?2:(errno==EINVAL?3:4)));
976 err("Could not find size of exported block device: %m");
981 * Get the file handle and offset, given an export offset.
983 * @param export An array of export files
984 * @param a The offset to get corresponding file/offset for
985 * @param fhandle [out] File descriptor
986 * @param foffset [out] Offset into fhandle
987 * @param maxbytes [out] Tells how many bytes can be read/written
988 * from fhandle starting at foffset (0 if there is no limit)
989 * @return 0 on success, -1 on failure
991 int get_filepos(GArray* export, off_t a, int* fhandle, off_t* foffset, size_t* maxbytes ) {
992 /* Negative offset not allowed */
996 /* Binary search for last file with starting offset <= a */
999 int end = export->len - 1;
1000 while( start <= end ) {
1001 int mid = (start + end) / 2;
1002 fi = g_array_index(export, FILE_INFO, mid);
1003 if( fi.startoff < a ) {
1005 } else if( fi.startoff > a ) {
1013 /* end should never go negative, since first startoff is 0 and a >= 0 */
1016 fi = g_array_index(export, FILE_INFO, end);
1017 *fhandle = fi.fhandle;
1018 *foffset = a - fi.startoff;
1020 if( end+1 < export->len ) {
1021 FILE_INFO fi_next = g_array_index(export, FILE_INFO, end+1);
1022 *maxbytes = fi_next.startoff - a;
1029 * seek to a position in a file, with error handling.
1030 * @param handle a filedescriptor
1031 * @param a position to seek to
1032 * @todo get rid of this; lastpoint is a global variable right now, but it
1033 * shouldn't be. If we pass it on as a parameter, that makes things a *lot*
1036 void myseek(int handle,off_t a) {
1037 if (lseek(handle, a, SEEK_SET) < 0) {
1038 err("Can not seek locally!\n");
1043 * Write an amount of bytes at a given offset to the right file. This
1044 * abstracts the write-side of the multiple file option.
1046 * @param a The offset where the write should start
1047 * @param buf The buffer to write from
1048 * @param len The length of buf
1049 * @param client The client we're serving for
1050 * @return The number of bytes actually written, or -1 in case of an error
1052 ssize_t rawexpwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1058 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
1060 if(maxbytes && len > maxbytes)
1063 DEBUG4("(WRITE to fd %d offset %llu len %u), ", fhandle, foffset, len);
1065 myseek(fhandle, foffset);
1066 retval = write(fhandle, buf, len);
1067 if(client->server->flags & F_SYNC) {
1074 * Call rawexpwrite repeatedly until all data has been written.
1075 * @return 0 on success, nonzero on failure
1077 int rawexpwrite_fully(off_t a, char *buf, size_t len, CLIENT *client) {
1080 while(len > 0 && (ret=rawexpwrite(a, buf, len, client)) > 0 ) {
1085 return (ret < 0 || len != 0);
1089 * Read an amount of bytes at a given offset from the right file. This
1090 * abstracts the read-side of the multiple files option.
1092 * @param a The offset where the read should start
1093 * @param buf A buffer to read into
1094 * @param len The size of buf
1095 * @param client The client we're serving for
1096 * @return The number of bytes actually read, or -1 in case of an
1099 ssize_t rawexpread(off_t a, char *buf, size_t len, CLIENT *client) {
1104 if(get_filepos(client->export, a, &fhandle, &foffset, &maxbytes))
1106 if(maxbytes && len > maxbytes)
1109 DEBUG4("(READ from fd %d offset %llu len %u), ", fhandle, foffset, len);
1111 myseek(fhandle, foffset);
1112 return read(fhandle, buf, len);
1116 * Call rawexpread repeatedly until all data has been read.
1117 * @return 0 on success, nonzero on failure
1119 int rawexpread_fully(off_t a, char *buf, size_t len, CLIENT *client) {
1122 while(len > 0 && (ret=rawexpread(a, buf, len, client)) > 0 ) {
1127 return (ret < 0 || len != 0);
1131 * Read an amount of bytes at a given offset from the right file. This
1132 * abstracts the read-side of the copyonwrite stuff, and calls
1133 * rawexpread() with the right parameters to do the actual work.
1134 * @param a The offset where the read should start
1135 * @param buf A buffer to read into
1136 * @param len The size of buf
1137 * @param client The client we're going to read for
1138 * @return 0 on success, nonzero on failure
1140 int expread(off_t a, char *buf, size_t len, CLIENT *client) {
1141 off_t rdlen, offset;
1142 off_t mapcnt, mapl, maph, pagestart;
1144 if (!(client->server->flags & F_COPYONWRITE))
1145 return(rawexpread_fully(a, buf, len, client));
1146 DEBUG3("Asked to read %d bytes at %llu.\n", len, (unsigned long long)a);
1148 mapl=a/DIFFPAGESIZE; maph=(a+len-1)/DIFFPAGESIZE;
1150 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1151 pagestart=mapcnt*DIFFPAGESIZE;
1153 rdlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1154 len : (size_t)DIFFPAGESIZE-offset;
1155 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1156 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1157 (unsigned long)(client->difmap[mapcnt]));
1158 myseek(client->difffile, client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1159 if (read(client->difffile, buf, rdlen) != rdlen) return -1;
1160 } else { /* the block is not there */
1161 DEBUG2("Page %llu is not here, we read the original one\n",
1162 (unsigned long long)mapcnt);
1163 if(rawexpread_fully(a, buf, rdlen, client)) return -1;
1165 len-=rdlen; a+=rdlen; buf+=rdlen;
1171 * Write an amount of bytes at a given offset to the right file. This
1172 * abstracts the write-side of the copyonwrite option, and calls
1173 * rawexpwrite() with the right parameters to do the actual work.
1175 * @param a The offset where the write should start
1176 * @param buf The buffer to write from
1177 * @param len The length of buf
1178 * @param client The client we're going to write for.
1179 * @return 0 on success, nonzero on failure
1181 int expwrite(off_t a, char *buf, size_t len, CLIENT *client) {
1182 char pagebuf[DIFFPAGESIZE];
1183 off_t mapcnt,mapl,maph;
1188 if (!(client->server->flags & F_COPYONWRITE))
1189 return(rawexpwrite_fully(a, buf, len, client));
1190 DEBUG3("Asked to write %d bytes at %llu.\n", len, (unsigned long long)a);
1192 mapl=a/DIFFPAGESIZE ; maph=(a+len-1)/DIFFPAGESIZE ;
1194 for (mapcnt=mapl;mapcnt<=maph;mapcnt++) {
1195 pagestart=mapcnt*DIFFPAGESIZE ;
1196 offset=a-pagestart ;
1197 wrlen=(0<DIFFPAGESIZE-offset && len<(size_t)(DIFFPAGESIZE-offset)) ?
1198 len : (size_t)DIFFPAGESIZE-offset;
1200 if (client->difmap[mapcnt]!=(u32)(-1)) { /* the block is already there */
1201 DEBUG3("Page %llu is at %lu\n", (unsigned long long)mapcnt,
1202 (unsigned long)(client->difmap[mapcnt])) ;
1203 myseek(client->difffile,
1204 client->difmap[mapcnt]*DIFFPAGESIZE+offset);
1205 if (write(client->difffile, buf, wrlen) != wrlen) return -1 ;
1206 } else { /* the block is not there */
1207 myseek(client->difffile,client->difffilelen*DIFFPAGESIZE) ;
1208 client->difmap[mapcnt]=(client->server->flags&F_SPARSE)?mapcnt:client->difffilelen++;
1209 DEBUG3("Page %llu is not here, we put it at %lu\n",
1210 (unsigned long long)mapcnt,
1211 (unsigned long)(client->difmap[mapcnt]));
1212 rdlen=DIFFPAGESIZE ;
1213 if (rawexpread_fully(pagestart, pagebuf, rdlen, client))
1215 memcpy(pagebuf+offset,buf,wrlen) ;
1216 if (write(client->difffile, pagebuf, DIFFPAGESIZE) !=
1220 len-=wrlen ; a+=wrlen ; buf+=wrlen ;
1226 * Do the initial negotiation.
1228 * @param client The client we're negotiating with.
1230 CLIENT* negotiate(int net, CLIENT *client, GArray* servers) {
1233 uint32_t flags = NBD_FLAG_HAS_FLAGS;
1234 uint16_t smallflags = 0;
1237 memset(zeros, '\0', sizeof(zeros));
1238 if(!client || !client->modern) {
1240 if (write(net, INIT_PASSWD, 8) < 0) {
1241 err_nonfatal("Negotiation failed: %m");
1245 if(!client || client->modern) {
1247 magic = htonll(opts_magic);
1250 magic = htonll(cliserv_magic);
1252 if (write(net, &magic, sizeof(magic)) < 0) {
1253 err_nonfatal("Negotiation failed: %m");
1267 err("programmer error");
1268 write(net, &smallflags, sizeof(uint16_t));
1269 read(net, &reserved, sizeof(reserved));
1270 read(net, &magic, sizeof(magic));
1271 magic = ntohll(magic);
1272 if(magic != opts_magic) {
1276 read(net, &opt, sizeof(opt));
1278 if(opt != NBD_OPT_EXPORT_NAME) {
1282 read(net, &namelen, sizeof(namelen));
1283 namelen = ntohl(namelen);
1284 name = malloc(namelen+1);
1286 read(net, name, namelen);
1287 for(i=0; i<servers->len; i++) {
1288 SERVER* serve = &(g_array_index(servers, SERVER, i));
1289 if(!strcmp(serve->servename, name)) {
1290 CLIENT* client = g_new0(CLIENT, 1);
1291 client->server = serve;
1292 client->exportsize = OFFT_MAX;
1294 client->modern = TRUE;
1301 size_host = htonll((u64)(client->exportsize));
1302 if (write(net, &size_host, 8) < 0)
1303 err("Negotiation failed: %m");
1304 if (client->server->flags & F_READONLY)
1305 flags |= NBD_FLAG_READ_ONLY;
1306 if (!client->modern) {
1308 flags = htonl(flags);
1309 if (write(client->net, &flags, 4) < 0)
1310 err("Negotiation failed: %m");
1313 smallflags = (uint16_t)(flags & ~((uint16_t)0));
1314 smallflags = htons(smallflags);
1315 if (write(client->net, &smallflags, sizeof(smallflags)) < 0) {
1316 err("Negotiation failed: %m");
1320 if (write(client->net, zeros, 124) < 0)
1321 err("Negotiation failed: %m");
1325 /** sending macro. */
1326 #define SEND(net,reply) writeit( net, &reply, sizeof( reply ));
1328 #define ERROR(client,reply,errcode) { reply.error = htonl(errcode); SEND(client->net,reply); reply.error = 0; }
1330 * Serve a file to a single client.
1332 * @todo This beast needs to be split up in many tiny little manageable
1333 * pieces. Preferably with a chainsaw.
1335 * @param client The client we're going to serve to.
1336 * @return when the client disconnects
1338 int mainloop(CLIENT *client) {
1339 struct nbd_request request;
1340 struct nbd_reply reply;
1341 gboolean go_on=TRUE;
1345 negotiate(client->net, client, NULL);
1346 DEBUG("Entering request loop!\n");
1347 reply.magic = htonl(NBD_REPLY_MAGIC);
1356 readit(client->net, &request, sizeof(request));
1357 request.from = ntohll(request.from);
1358 request.type = ntohl(request.type);
1360 if (request.type==NBD_CMD_DISC) {
1361 msg2(LOG_INFO, "Disconnect request received.");
1362 if (client->server->flags & F_COPYONWRITE) {
1363 if (client->difmap) g_free(client->difmap) ;
1364 close(client->difffile);
1365 unlink(client->difffilename);
1366 free(client->difffilename);
1372 len = ntohl(request.len);
1374 if (request.magic != htonl(NBD_REQUEST_MAGIC))
1375 err("Not enough magic.");
1376 if (len > BUFSIZE + sizeof(struct nbd_reply))
1377 err("Request too big!");
1379 printf("%s from %llu (%llu) len %d, ", request.type ? "WRITE" :
1380 "READ", (unsigned long long)request.from,
1381 (unsigned long long)request.from / 512, len);
1383 memcpy(reply.handle, request.handle, sizeof(reply.handle));
1384 if ((request.from + len) > (OFFT_MAX)) {
1385 DEBUG("[Number too large!]");
1386 ERROR(client, reply, EINVAL);
1390 if (((ssize_t)((off_t)request.from + len) > client->exportsize)) {
1392 ERROR(client, reply, EINVAL);
1396 if (request.type==NBD_CMD_WRITE) {
1397 DEBUG("wr: net->buf, ");
1398 readit(client->net, buf, len);
1399 DEBUG("buf->exp, ");
1400 if ((client->server->flags & F_READONLY) ||
1401 (client->server->flags & F_AUTOREADONLY)) {
1402 DEBUG("[WRITE to READONLY!]");
1403 ERROR(client, reply, EPERM);
1406 if (expwrite(request.from, buf, len, client)) {
1407 DEBUG("Write failed: %m" );
1408 ERROR(client, reply, errno);
1411 SEND(client->net, reply);
1417 DEBUG("exp->buf, ");
1418 if (expread(request.from, buf + sizeof(struct nbd_reply), len, client)) {
1419 DEBUG("Read failed: %m");
1420 ERROR(client, reply, errno);
1424 DEBUG("buf->net, ");
1425 memcpy(buf, &reply, sizeof(struct nbd_reply));
1426 writeit(client->net, buf, len + sizeof(struct nbd_reply));
1433 * Set up client export array, which is an array of FILE_INFO.
1434 * Also, split a single exportfile into multiple ones, if that was asked.
1435 * @param client information on the client which we want to setup export for
1437 void setupexport(CLIENT* client) {
1439 off_t laststartoff = 0, lastsize = 0;
1440 int multifile = (client->server->flags & F_MULTIFILE);
1442 client->export = g_array_new(TRUE, TRUE, sizeof(FILE_INFO));
1444 /* If multi-file, open as many files as we can.
1445 * If not, open exactly one file.
1446 * Calculate file sizes as we go to get total size. */
1450 gchar* error_string;
1451 mode_t mode = (client->server->flags & F_READONLY) ? O_RDONLY : O_RDWR;
1454 tmpname=g_strdup_printf("%s.%d", client->exportname, i);
1456 tmpname=g_strdup(client->exportname);
1458 DEBUG2( "Opening %s\n", tmpname );
1459 fi.fhandle = open(tmpname, mode);
1460 if(fi.fhandle == -1 && mode == O_RDWR) {
1461 /* Try again because maybe media was read-only */
1462 fi.fhandle = open(tmpname, O_RDONLY);
1463 if(fi.fhandle != -1) {
1464 /* Opening the base file in copyonwrite mode is
1466 if(!(client->server->flags & F_COPYONWRITE)) {
1467 client->server->flags |= F_AUTOREADONLY;
1468 client->server->flags |= F_READONLY;
1472 if(fi.fhandle == -1) {
1473 if(multifile && i>0)
1475 error_string=g_strdup_printf(
1476 "Could not open exported file %s: %%m",
1480 fi.startoff = laststartoff + lastsize;
1481 g_array_append_val(client->export, fi);
1484 /* Starting offset and size of this file will be used to
1485 * calculate starting offset of next file */
1486 laststartoff = fi.startoff;
1487 lastsize = size_autodetect(fi.fhandle);
1493 /* Set export size to total calculated size */
1494 client->exportsize = laststartoff + lastsize;
1496 /* Export size may be overridden */
1497 if(client->server->expected_size) {
1498 /* desired size must be <= total calculated size */
1499 if(client->server->expected_size > client->exportsize) {
1500 err("Size of exported file is too big\n");
1503 client->exportsize = client->server->expected_size;
1506 msg3(LOG_INFO, "Size of exported file/device is %llu", (unsigned long long)client->exportsize);
1508 msg3(LOG_INFO, "Total number of files: %d", i);
1512 int copyonwrite_prepare(CLIENT* client) {
1514 if ((client->difffilename = malloc(1024))==NULL)
1515 err("Failed to allocate string for diff file name");
1516 snprintf(client->difffilename, 1024, "%s-%s-%d.diff",client->exportname,client->clientname,
1518 client->difffilename[1023]='\0';
1519 msg3(LOG_INFO,"About to create map and diff file %s",client->difffilename) ;
1520 client->difffile=open(client->difffilename,O_RDWR | O_CREAT | O_TRUNC,0600) ;
1521 if (client->difffile<0) err("Could not create diff file (%m)") ;
1522 if ((client->difmap=calloc(client->exportsize/DIFFPAGESIZE,sizeof(u32)))==NULL)
1523 err("Could not allocate memory") ;
1524 for (i=0;i<client->exportsize/DIFFPAGESIZE;i++) client->difmap[i]=(u32)-1 ;
1530 * Run a command. This is used for the ``prerun'' and ``postrun'' config file
1533 * @param command the command to be ran. Read from the config file
1534 * @param file the file name we're about to export
1536 int do_run(gchar* command, gchar* file) {
1540 if(command && *command) {
1541 cmd = g_strdup_printf(command, file);
1549 * Serve a connection.
1551 * @todo allow for multithreading, perhaps use libevent. Not just yet, though;
1552 * follow the road map.
1554 * @param client a connected client
1556 void serveconnection(CLIENT *client) {
1557 if(do_run(client->server->prerun, client->exportname)) {
1560 setupexport(client);
1562 if (client->server->flags & F_COPYONWRITE) {
1563 copyonwrite_prepare(client);
1566 setmysockopt(client->net);
1569 do_run(client->server->postrun, client->exportname);
1573 * Find the name of the file we have to serve. This will use g_strdup_printf
1574 * to put the IP address of the client inside a filename containing
1575 * "%s" (in the form as specified by the "virtstyle" option). That name
1576 * is then written to client->exportname.
1578 * @param net A socket connected to an nbd client
1579 * @param client information about the client. The IP address in human-readable
1580 * format will be written to a new char* buffer, the address of which will be
1581 * stored in client->clientname.
1583 void set_peername(int net, CLIENT *client) {
1584 struct sockaddr_storage addrin;
1585 struct sockaddr_storage netaddr;
1586 struct sockaddr_in *netaddr4 = NULL;
1587 struct sockaddr_in6 *netaddr6 = NULL;
1588 size_t addrinlen = sizeof( addrin );
1589 struct addrinfo hints;
1590 struct addrinfo *ai = NULL;
1591 char peername[NI_MAXHOST];
1592 char netname[NI_MAXHOST];
1598 if (getpeername(net, (struct sockaddr *) &addrin, (socklen_t *)&addrinlen) < 0)
1599 err("getsockname failed: %m");
1601 getnameinfo((struct sockaddr *)&addrin, (socklen_t)addrinlen,
1602 peername, sizeof (peername), NULL, 0, NI_NUMERICHOST);
1604 memset(&hints, '\0', sizeof (hints));
1605 hints.ai_flags = AI_ADDRCONFIG;
1606 e = getaddrinfo(peername, NULL, &hints, &ai);
1609 fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
1614 switch(client->server->virtstyle) {
1616 client->exportname=g_strdup(client->server->exportname);
1619 for(i=0;i<strlen(peername);i++) {
1620 if(peername[i]=='.') {
1625 client->exportname=g_strdup_printf(client->server->exportname, peername);
1628 memcpy(&netaddr, &addrin, addrinlen);
1629 if(ai->ai_family == AF_INET) {
1630 netaddr4 = (struct sockaddr_in *)&netaddr;
1631 (netaddr4->sin_addr).s_addr>>=32-(client->server->cidrlen);
1632 (netaddr4->sin_addr).s_addr<<=32-(client->server->cidrlen);
1634 getnameinfo((struct sockaddr *) netaddr4, (socklen_t) addrinlen,
1635 netname, sizeof (netname), NULL, 0, NI_NUMERICHOST);
1636 tmp=g_strdup_printf("%s/%s", netname, peername);
1637 }else if(ai->ai_family == AF_INET6) {
1638 netaddr6 = (struct sockaddr_in6 *)&netaddr;
1640 shift = 128-(client->server->cidrlen);
1642 while(shift >= 32) {
1643 ((netaddr6->sin6_addr).s6_addr32[i])=0;
1647 (netaddr6->sin6_addr).s6_addr32[i]>>=shift;
1648 (netaddr6->sin6_addr).s6_addr32[i]<<=shift;
1650 getnameinfo((struct sockaddr *)netaddr6, (socklen_t)addrinlen,
1651 netname, sizeof(netname), NULL, 0, NI_NUMERICHOST);
1652 tmp=g_strdup_printf("%s/%s", netname, peername);
1656 client->exportname=g_strdup_printf(client->server->exportname, tmp);
1662 msg4(LOG_INFO, "connect from %s, assigned file is %s",
1663 peername, client->exportname);
1664 client->clientname=g_strdup(peername);
1669 * @param data a pointer to pid_t which should be freed
1671 void destroy_pid_t(gpointer data) {
1676 * Loop through the available servers, and serve them. Never returns.
1678 int serveloop(GArray* servers) {
1679 struct sockaddr_storage addrin;
1680 socklen_t addrinlen=sizeof(addrin);
1688 * Set up the master fd_set. The set of descriptors we need
1689 * to select() for never changes anyway and it buys us a *lot*
1690 * of time to only build this once. However, if we ever choose
1691 * to not fork() for clients anymore, we may have to revisit
1696 for(i=0;i<servers->len;i++) {
1697 if((sock=(g_array_index(servers, SERVER, i)).socket)) {
1698 FD_SET(sock, &mset);
1699 max=sock>max?sock:max;
1703 FD_SET(modernsock, &mset);
1704 max=modernsock>max?modernsock:max;
1707 CLIENT *client = NULL;
1710 memcpy(&rset, &mset, sizeof(fd_set));
1711 if(select(max+1, &rset, NULL, NULL, NULL)>0) {
1716 if(FD_ISSET(modernsock, &rset)) {
1717 if((net=accept(modernsock, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1719 client = negotiate(net, NULL, servers);
1721 err_nonfatal("negotiation failed");
1726 for(i=0;i<servers->len && !net;i++) {
1727 serve=&(g_array_index(servers, SERVER, i));
1728 if(FD_ISSET(serve->socket, &rset)) {
1729 if ((net=accept(serve->socket, (struct sockaddr *) &addrin, &addrinlen)) < 0)
1736 if((sock_flags = fcntl(net, F_GETFL, 0))==-1) {
1737 err("fcntl F_GETFL");
1739 if(fcntl(net, F_SETFL, sock_flags &~O_NONBLOCK)==-1) {
1740 err("fcntl F_SETFL ~O_NONBLOCK");
1743 client = g_new0(CLIENT, 1);
1744 client->server=serve;
1745 client->exportsize=OFFT_MAX;
1748 set_peername(net, client);
1749 if (!authorized_client(client)) {
1750 msg2(LOG_INFO,"Unauthorized client") ;
1754 msg2(LOG_INFO,"Authorized client") ;
1755 pid=g_malloc(sizeof(pid_t));
1757 if ((*pid=fork())<0) {
1758 msg3(LOG_INFO,"Could not fork (%s)",strerror(errno)) ;
1762 if (*pid>0) { /* parent */
1764 g_hash_table_insert(children, pid, pid);
1768 g_hash_table_destroy(children);
1769 for(i=0;i<servers->len;i++) {
1770 serve=&g_array_index(servers, SERVER, i);
1771 close(serve->socket);
1773 /* FALSE does not free the
1774 actual data. This is required,
1775 because the client has a
1776 direct reference into that
1777 data, and otherwise we get a
1779 g_array_free(servers, FALSE);
1781 msg2(LOG_INFO,"Starting to serve");
1782 serveconnection(client);
1789 void dosockopts(int socket) {
1797 /* lose the pesky "Address already in use" error message */
1798 if (setsockopt(socket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
1799 err("setsockopt SO_REUSEADDR");
1801 if (setsockopt(socket,SOL_SOCKET,SO_KEEPALIVE,&yes,sizeof(int)) == -1) {
1802 err("setsockopt SO_KEEPALIVE");
1805 /* make the listening socket non-blocking */
1806 if ((sock_flags = fcntl(socket, F_GETFL, 0)) == -1) {
1807 err("fcntl F_GETFL");
1809 if (fcntl(socket, F_SETFL, sock_flags | O_NONBLOCK) == -1) {
1810 err("fcntl F_SETFL O_NONBLOCK");
1815 * Connect a server's socket.
1817 * @param serve the server we want to connect.
1819 int setup_serve(SERVER *serve) {
1820 struct addrinfo hints;
1821 struct addrinfo *ai = NULL;
1826 return serve->servename ? 1 : 0;
1828 memset(&hints,'\0',sizeof(hints));
1829 hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG | AI_NUMERICSERV;
1830 hints.ai_socktype = SOCK_STREAM;
1831 hints.ai_family = serve->socket_family;
1833 port = g_strdup_printf ("%d", serve->port);
1837 e = getaddrinfo(serve->listenaddr,port,&hints,&ai);
1842 fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
1848 if(serve->socket_family == AF_UNSPEC)
1849 serve->socket_family = ai->ai_family;
1852 if ((serve->flags) && F_SDP) {
1853 if (ai->ai_family == AF_INET)
1854 ai->ai_family = AF_INET_SDP;
1855 else (ai->ai_family == AF_INET6)
1856 ai->ai_family = AF_INET6_SDP;
1859 if ((serve->socket = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0)
1862 dosockopts(serve->socket);
1864 DEBUG("Waiting for connections... bind, ");
1865 e = bind(serve->socket, ai->ai_addr, ai->ai_addrlen);
1866 if (e != 0 && errno != EADDRINUSE)
1869 if (listen(serve->socket, 1) < 0)
1873 if(serve->servename) {
1880 void open_modern(void) {
1881 struct addrinfo hints;
1882 struct addrinfo* ai = NULL;
1886 memset(&hints, '\0', sizeof(hints));
1887 hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
1888 hints.ai_socktype = SOCK_STREAM;
1889 hints.ai_family = AF_UNSPEC;
1890 hints.ai_protocol = IPPROTO_TCP;
1891 e = getaddrinfo(modern_listen, NBD_DEFAULT_PORT, &hints, &ai);
1893 fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
1896 if((modernsock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol))<0) {
1900 dosockopts(modernsock);
1902 if(bind(modernsock, ai->ai_addr, ai->ai_addrlen)) {
1905 if(listen(modernsock, 10) <0) {
1913 * Connect our servers.
1915 void setup_servers(GArray* servers) {
1917 struct sigaction sa;
1920 for(i=0;i<servers->len;i++) {
1921 want_modern |= setup_serve(&(g_array_index(servers, SERVER, i)));
1926 children=g_hash_table_new_full(g_int_hash, g_int_equal, NULL, destroy_pid_t);
1928 sa.sa_handler = sigchld_handler;
1929 sigemptyset(&sa.sa_mask);
1930 sa.sa_flags = SA_RESTART;
1931 if(sigaction(SIGCHLD, &sa, NULL) == -1)
1932 err("sigaction: %m");
1933 sa.sa_handler = sigterm_handler;
1934 sigemptyset(&sa.sa_mask);
1935 sa.sa_flags = SA_RESTART;
1936 if(sigaction(SIGTERM, &sa, NULL) == -1)
1937 err("sigaction: %m");
1941 * Go daemon (unless we specified at compile time that we didn't want this)
1942 * @param serve the first server of our configuration. If its port is zero,
1943 * then do not daemonize, because we're doing inetd then. This parameter
1944 * is only used to create a PID file of the form
1945 * /var/run/nbd-server.<port>.pid; it's not modified in any way.
1947 #if !defined(NODAEMON) && !defined(NOFORK)
1948 void daemonize(SERVER* serve) {
1951 if(serve && !(serve->port)) {
1957 if(!*pidftemplate) {
1959 strncpy(pidftemplate, "/var/run/nbd-server.%d.pid", 255);
1961 strncpy(pidftemplate, "/var/run/nbd-server.pid", 255);
1964 snprintf(pidfname, 255, pidftemplate, serve ? serve->port : 0);
1965 pidf=fopen(pidfname, "w");
1967 fprintf(pidf,"%d\n", (int)getpid());
1971 fprintf(stderr, "Not fatal; continuing");
1975 #define daemonize(serve)
1976 #endif /* !defined(NODAEMON) && !defined(NOFORK) */
1979 * Everything beyond this point (in the file) is run in non-daemon mode.
1980 * The stuff above daemonize() isn't.
1983 void serve_err(SERVER* serve, const char* msg) G_GNUC_NORETURN;
1985 void serve_err(SERVER* serve, const char* msg) {
1986 g_message("Export of %s on port %d failed:", serve->exportname,
1992 * Set up user-ID and/or group-ID
1994 void dousers(void) {
1999 gr=getgrnam(rungroup);
2001 str = g_strdup_printf("Invalid group name: %s", rungroup);
2004 if(setgid(gr->gr_gid)<0) {
2005 err("Could not set GID: %m");
2009 pw=getpwnam(runuser);
2011 str = g_strdup_printf("Invalid user name: %s", runuser);
2014 if(setuid(pw->pw_uid)<0) {
2015 err("Could not set UID: %m");
2021 void glib_message_syslog_redirect(const gchar *log_domain,
2022 GLogLevelFlags log_level,
2023 const gchar *message,
2026 int level=LOG_DEBUG;
2030 case G_LOG_FLAG_FATAL:
2031 case G_LOG_LEVEL_CRITICAL:
2032 case G_LOG_LEVEL_ERROR:
2035 case G_LOG_LEVEL_WARNING:
2038 case G_LOG_LEVEL_MESSAGE:
2039 case G_LOG_LEVEL_INFO:
2042 case G_LOG_LEVEL_DEBUG:
2047 syslog(level, message);
2052 * Main entry point...
2054 int main(int argc, char *argv[]) {
2059 if (sizeof( struct nbd_request )!=28) {
2060 fprintf(stderr,"Bad size of structure. Alignment problems?\n");
2061 exit(EXIT_FAILURE) ;
2064 memset(pidftemplate, '\0', 256);
2067 config_file_pos = g_strdup(CFILE);
2068 serve=cmdline(argc, argv);
2069 servers = parse_cfile(config_file_pos, &err);
2072 serve->socket_family = AF_UNSPEC;
2074 append_serve(serve, servers);
2076 if (!(serve->port)) {
2079 /* You really should define ISSERVER if you're going to use
2080 * inetd mode, but if you don't, closing stdout and stderr
2081 * (which inetd had connected to the client socket) will let it
2085 open("/dev/null", O_WRONLY);
2086 open("/dev/null", O_WRONLY);
2087 g_log_set_default_handler( glib_message_syslog_redirect, NULL );
2089 client=g_malloc(sizeof(CLIENT));
2090 client->server=serve;
2092 client->exportsize=OFFT_MAX;
2093 set_peername(0,client);
2094 serveconnection(client);
2099 if(!servers || !servers->len) {
2100 g_warning("Could not parse config file: %s",
2101 err ? err->message : "Unknown error");
2104 g_warning("Specifying an export on the command line is deprecated.");
2105 g_warning("Please use a configuration file instead.");
2108 if((!serve) && (!servers||!servers->len)) {
2109 g_message("Nothing to do! Bye!");
2113 setup_servers(servers);