2 Bacula® - The Network Backup Solution
4 Copyright (C) 2007-2010 Free Software Foundation Europe e.V.
6 The main author of Bacula is Kern Sibbald, with contributions from
7 many others, a complete list can be found in the file AUTHORS.
8 This program is Free Software; you can redistribute it and/or
9 modify it under the terms of version two of the GNU General Public
10 License as published by the Free Software Foundation, which is
11 listed in the file LICENSE.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 Bacula® is a registered trademark of Kern Sibbald.
24 The licensor of Bacula is the Free Software Foundation Europe
25 (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
26 Switzerland, email:ftf@fsfeurope.org.
29 * A simple pipe plugin for the Bacula File Daemon
31 * Kern Sibbald, October 2007
35 #include "fd_plugins.h"
48 static const int dbglvl = 150;
50 #define PLUGIN_LICENSE "Bacula GPLv2"
51 #define PLUGIN_AUTHOR "Kern Sibbald"
52 #define PLUGIN_DATE "January 2008"
53 #define PLUGIN_VERSION "1"
54 #define PLUGIN_DESCRIPTION "Bacula Pipe File Daemon Plugin"
56 /* Forward referenced functions */
57 static bRC newPlugin(bpContext *ctx);
58 static bRC freePlugin(bpContext *ctx);
59 static bRC getPluginValue(bpContext *ctx, pVariable var, void *value);
60 static bRC setPluginValue(bpContext *ctx, pVariable var, void *value);
61 static bRC handlePluginEvent(bpContext *ctx, bEvent *event, void *value);
62 static bRC startBackupFile(bpContext *ctx, struct save_pkt *sp);
63 static bRC endBackupFile(bpContext *ctx);
64 static bRC pluginIO(bpContext *ctx, struct io_pkt *io);
65 static bRC startRestoreFile(bpContext *ctx, const char *cmd);
66 static bRC endRestoreFile(bpContext *ctx);
67 static bRC createFile(bpContext *ctx, struct restore_pkt *rp);
68 static bRC setFileAttributes(bpContext *ctx, struct restore_pkt *rp);
70 static char *apply_rp_codes(struct plugin_ctx * p_ctx);
72 /* Pointers to Bacula functions */
73 static bFuncs *bfuncs = NULL;
74 static bInfo *binfo = NULL;
76 /* Plugin Information block */
77 static pInfo pluginInfo = {
79 FD_PLUGIN_INTERFACE_VERSION,
88 /* Plugin entry points for Bacula */
89 static pFuncs pluginFuncs = {
91 FD_PLUGIN_INTERFACE_VERSION,
93 /* Entry points into plugin */
94 newPlugin, /* new plugin instance */
95 freePlugin, /* free plugin instance */
109 * Plugin private context
113 FILE *fd; /* pipe file descriptor */
114 bool backup; /* set for backup (not needed) */
115 char *cmd; /* plugin command line */
116 char *fname; /* filename to "backup/restore" */
117 char *reader; /* reader program for backup */
118 char *writer; /* writer program for backup */
125 * loadPlugin() and unloadPlugin() are entry points that are
126 * exported, so Bacula can directly call these two entry points
127 * they are common to all Bacula plugins.
130 * External entry point called by Bacula to "load the plugin
132 bRC loadPlugin(bInfo *lbinfo, bFuncs *lbfuncs, pInfo **pinfo, pFuncs **pfuncs)
134 bfuncs = lbfuncs; /* set Bacula funct pointers */
136 *pinfo = &pluginInfo; /* return pointer to our info */
137 *pfuncs = &pluginFuncs; /* return pointer to our functions */
143 * External entry point to unload the plugin
147 // printf("bpipe-fd: Unloaded\n");
152 * The following entry points are accessed through the function
153 * pointers we supplied to Bacula. Each plugin type (dir, fd, sd)
154 * has its own set of entry points that the plugin must define.
157 * Create a new instance of the plugin i.e. allocate our private storage
159 static bRC newPlugin(bpContext *ctx)
161 struct plugin_ctx *p_ctx = (struct plugin_ctx *)malloc(sizeof(struct plugin_ctx));
165 memset(p_ctx, 0, sizeof(struct plugin_ctx));
166 ctx->pContext = (void *)p_ctx; /* set our context pointer */
171 * Free a plugin instance, i.e. release our private storage
173 static bRC freePlugin(bpContext *ctx)
175 struct plugin_ctx *p_ctx = (struct plugin_ctx *)ctx->pContext;
180 free(p_ctx->cmd); /* free any allocated command string */
182 free(p_ctx); /* free our private context */
188 * Return some plugin value (none defined)
190 static bRC getPluginValue(bpContext *ctx, pVariable var, void *value)
196 * Set a plugin value (none defined)
198 static bRC setPluginValue(bpContext *ctx, pVariable var, void *value)
204 * Handle an event that was generated in Bacula
206 static bRC handlePluginEvent(bpContext *ctx, bEvent *event, void *value)
208 struct plugin_ctx *p_ctx = (struct plugin_ctx *)ctx->pContext;
216 * Most events don't interest us so we ignore them.
217 * the printfs are so that plugin writers can enable them to see
218 * what is really going on.
220 switch (event->eventType) {
222 bfuncs->DebugMessage(ctx, fi, li, dbglvl, "bpipe-fd: JobStart=%s\n", (char *)value);
225 // printf("bpipe-fd: JobEnd\n");
227 case bEventStartBackupJob:
228 // printf("bpipe-fd: StartBackupJob\n");
230 case bEventEndBackupJob:
231 // printf("bpipe-fd: EndBackupJob\n");
234 // printf("bpipe-fd: JobLevel=%c %d\n", (int)value, (int)value);
237 // printf("bpipe-fd: since=%d\n", (int)value);
240 case bEventStartRestoreJob:
241 // printf("bpipe-fd: StartRestoreJob\n");
244 case bEventEndRestoreJob:
245 // printf("bpipe-fd: EndRestoreJob\n");
248 /* Plugin command e.g. plugin = <plugin-name>:<name-space>:read command:write command */
249 case bEventRestoreCommand:
250 // printf("bpipe-fd: EventRestoreCommand cmd=%s\n", (char *)value);
251 /* Fall-through wanted */
252 case bEventBackupCommand:
254 bfuncs->DebugMessage(ctx, fi, li, dbglvl, "bpipe-fd: pluginEvent cmd=%s\n", (char *)value);
255 p_ctx->cmd = strdup((char *)value);
256 p = strchr(p_ctx->cmd, ':');
258 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0, "Plugin terminator not found: %s\n", (char *)value);
261 *p++ = 0; /* terminate plugin */
265 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0, "File terminator not found: %s\n", (char *)value);
268 *p++ = 0; /* terminate file */
272 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0, "Reader terminator not found: %s\n", (char *)value);
275 *p++ = 0; /* terminate reader string */
277 // printf("bpipe-fd: plugin=%s fname=%s reader=%s writer=%s\n",
278 // p_ctx->cmd, p_ctx->fname, p_ctx->reader, p_ctx->writer);
282 // printf("bpipe-fd: unknown event=%d\n", event->eventType);
289 * Start the backup of a specific file
291 static bRC startBackupFile(bpContext *ctx, struct save_pkt *sp)
293 struct plugin_ctx *p_ctx = (struct plugin_ctx *)ctx->pContext;
297 time_t now = time(NULL);
298 sp->fname = p_ctx->fname;
300 sp->statp.st_mode = 0700 | S_IFREG;
301 sp->statp.st_ctime = now;
302 sp->statp.st_mtime = now;
303 sp->statp.st_atime = now;
304 sp->statp.st_size = -1;
305 sp->statp.st_blksize = 4096;
306 sp->statp.st_blocks = 1;
307 p_ctx->backup = true;
308 // printf("bpipe-fd: startBackupFile\n");
313 * Done with backup of this file
315 static bRC endBackupFile(bpContext *ctx)
318 * We would return bRC_More if we wanted startBackupFile to be
319 * called again to backup another file
326 * Bacula is calling us to do the actual I/O
328 static bRC pluginIO(bpContext *ctx, struct io_pkt *io)
330 struct plugin_ctx *p_ctx = (struct plugin_ctx *)ctx->pContext;
339 bfuncs->DebugMessage(ctx, fi, li, dbglvl, "bpipe-fd: IO_OPEN\n");
340 if (io->flags & (O_CREAT | O_WRONLY)) {
341 char *writer_codes = apply_rp_codes(p_ctx);
343 p_ctx->fd = popen(writer_codes, "w");
344 bfuncs->DebugMessage(ctx, fi, li, dbglvl, "bpipe-fd: IO_OPEN fd=%d writer=%s\n",
345 p_ctx->fd, writer_codes);
347 io->io_errno = errno;
348 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0,
349 "Open pipe writer=%s failed: ERR=%s\n", writer_codes, strerror(errno));
359 p_ctx->fd = popen(p_ctx->reader, "r");
360 bfuncs->DebugMessage(ctx, fi, li, dbglvl, "bpipe-fd: IO_OPEN fd=%p reader=%s\n",
361 p_ctx->fd, p_ctx->reader);
363 io->io_errno = errno;
364 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0,
365 "Open pipe reader=%s failed: ERR=%s\n", p_ctx->reader, strerror(errno));
369 sleep(1); /* let pipe connect */
374 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0, "Logic error: NULL read FD\n");
377 io->status = fread(io->buf, 1, io->count, p_ctx->fd);
378 // bfuncs->DebugMessage(ctx, fi, li, dbglvl, "bpipe-fd: IO_READ buf=%p len=%d\n", io->buf, io->status);
379 if (io->status == 0 && ferror(p_ctx->fd)) {
380 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0,
381 "Pipe read error: ERR=%s\n", strerror(errno));
382 bfuncs->DebugMessage(ctx, fi, li, dbglvl,
383 "Pipe read error: ERR=%s\n", strerror(errno));
390 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0, "Logic error: NULL write FD\n");
393 // printf("bpipe-fd: IO_WRITE fd=%p buf=%p len=%d\n", p_ctx->fd, io->buf, io->count);
394 io->status = fwrite(io->buf, 1, io->count, p_ctx->fd);
395 // printf("bpipe-fd: IO_WRITE buf=%p len=%d\n", io->buf, io->status);
396 if (io->status == 0 && ferror(p_ctx->fd)) {
397 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0,
398 "Pipe write error\n");
399 bfuncs->DebugMessage(ctx, fi, li, dbglvl,
400 "Pipe read error: ERR=%s\n", strerror(errno));
407 bfuncs->JobMessage(ctx, fi, li, M_FATAL, 0, "Logic error: NULL FD on bpipe close\n");
410 io->status = pclose(p_ctx->fd);
414 io->offset = p_ctx->offset;
421 * Bacula is notifying us that a plugin name string was found, and
422 * passing us the plugin command, so we can prepare for a restore.
424 static bRC startRestoreFile(bpContext *ctx, const char *cmd)
426 // printf("bpipe-fd: startRestoreFile cmd=%s\n", cmd);
431 * Bacula is notifying us that the plugin data has terminated, so
432 * the restore for this particular file is done.
434 static bRC endRestoreFile(bpContext *ctx)
436 // printf("bpipe-fd: endRestoreFile\n");
441 * This is called during restore to create the file (if necessary)
442 * We must return in rp->create_status:
445 * CF_SKIP -- skip processing this file
446 * CF_EXTRACT -- extract the file (i.e.call i/o routines)
447 * CF_CREATED -- created, but no content to extract (typically directories)
450 static bRC createFile(bpContext *ctx, struct restore_pkt *rp)
452 // printf("bpipe-fd: createFile\n");
453 if (strlen(rp->where) > 512) {
454 printf("Restore target dir too long. Restricting to first 512 bytes.\n");
456 strncpy(((struct plugin_ctx *)ctx->pContext)->where, rp->where, 513);
457 ((struct plugin_ctx *)ctx->pContext)->replace = rp->replace;
458 rp->create_status = CF_EXTRACT;
463 * We will get here if the File is a directory after everything
464 * is written in the directory.
466 static bRC setFileAttributes(bpContext *ctx, struct restore_pkt *rp)
468 // printf("bpipe-fd: setFileAttributes\n");
472 /*************************************************************************
473 * Apply codes in writer command:
478 * 'always' => 'a', chr(97)
479 * 'ifnewer' => 'w', chr(119)
480 * 'ifolder' => 'o', chr(111)
481 * 'never' => 'n', chr(110)
483 * This function will allocate the required amount of memory with malloc.
484 * Need to be free()d manually.
485 * Inspired by edit_job_codes in lib/util.c
488 static char *apply_rp_codes(struct plugin_ctx * p_ctx)
493 int w_count = 0, r_count = 0;
496 char *imsg = p_ctx->writer;
503 while ((q = strstr(p, "%w"))) {
509 while ((q = strstr(p, "%r"))) {
517 * + number of "where" codes * (len(where)-2)
518 * - number of "replace" codes
520 omsg = (char*)malloc(strlen(imsg) + (w_count * (strlen(p_ctx->where)-2)) - r_count + 1);
522 fprintf(stderr, "Out of memory.");
527 //printf("apply_rp_codes: %s\n", imsg);
528 for (p=imsg; *p; p++) {
538 snprintf(add, 2, "%c", p_ctx->replace);
553 //printf("add_str %s\n", str);
555 //printf("omsg=%s\n", omsg);