Mentioned the vanished-file warning enhancement.

[rsync.git] / receiver.c

/* -*- c-file-style: "linux" -*-

   Copyright (C) 1996-2000 by Andrew Tridgell
   Copyright (C) Paul Mackerras 1996

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "rsync.h"

extern int verbose;
extern int recurse;
extern int delete_mode;
extern int protocol_version;
extern int csum_length;
extern struct stats stats;
extern int dry_run;
extern int am_server;
extern int relative_paths;
extern int preserve_hard_links;
extern int cvs_exclude;
extern int io_error;
extern char *tmpdir;
extern char *compare_dest;
extern int make_backups;
extern int do_progress;
extern char *backup_dir;
extern char *backup_suffix;
extern int backup_suffix_len;

static struct delete_list {
        DEV64_T dev;
        INO64_T inode;
} *delete_list;
static int dlist_len, dlist_alloc_len;

/* yuck! This function wouldn't have been necessary if I had the sorting
 * algorithm right. Unfortunately fixing the sorting algorithm would introduce
 * a backward incompatibility as file list indexes are sent over the link.
 */
static int delete_already_done(struct file_list *flist,int j)
{
        int i;
        STRUCT_STAT st;

        if (link_stat(f_name(flist->files[j]), &st)) return 1;

        for (i = 0; i < dlist_len; i++) {
                if (st.st_ino == delete_list[i].inode &&
                    (DEV64_T)st.st_dev == delete_list[i].dev)
                        return 1;
        }

        return 0;
}

static void add_delete_entry(struct file_struct *file)
{
        if (dlist_len == dlist_alloc_len) {
                dlist_alloc_len += 1024;
                delete_list = realloc_array(delete_list, struct delete_list,
                                            dlist_alloc_len);
                if (!delete_list) out_of_memory("add_delete_entry");
        }

        delete_list[dlist_len].dev = file->dev;
        delete_list[dlist_len].inode = file->inode;
        dlist_len++;

        if (verbose > 3)
                rprintf(FINFO,"added %s to delete list\n", f_name(file));
}

static void delete_one(char *fn, int is_dir)
{
        if (!is_dir) {
                if (robust_unlink(fn) != 0) {
                        rprintf(FERROR, "delete_one: unlink %s failed: %s\n",
                                full_fname(fn), strerror(errno));
                } else if (verbose) {
                        rprintf(FINFO, "deleting %s\n", fn);
                }
        } else {
                if (do_rmdir(fn) != 0) {
                        if (errno != ENOTEMPTY && errno != EEXIST) {
                                rprintf(FERROR, "delete_one: rmdir %s failed: %s\n",
                                        full_fname(fn), strerror(errno));
                        }
                } else if (verbose) {
                        rprintf(FINFO, "deleting directory %s\n", fn);
                }
        }
}


static int is_backup_file(char *fn)
{
        int k = strlen(fn) - backup_suffix_len;
        return k > 0 && strcmp(fn+k, backup_suffix) == 0;
}


/* this deletes any files on the receiving side that are not present
 * on the sending side. For version 1.6.4 I have changed the behaviour
 * to match more closely what most people seem to expect of this option */
void delete_files(struct file_list *flist)
{
        struct file_list *local_file_list;
        int i, j;
        char *name;
        extern int module_id;
        extern int ignore_errors;
        extern int max_delete;
        static int deletion_count;

        if (cvs_exclude)
                add_cvs_excludes();

        if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
                rprintf(FINFO,"IO error encountered - skipping file deletion\n");
                return;
        }

        for (j=0;j<flist->count;j++) {
                if (!S_ISDIR(flist->files[j]->mode) ||
                    !(flist->files[j]->flags & FLAG_DELETE)) continue;

                if (protocol_version < 19 &&
                    delete_already_done(flist, j)) continue;

                name = strdup(f_name(flist->files[j]));

                if (!(local_file_list = send_file_list(-1,1,&name))) {
                        free(name);
                        continue;
                }

                if (verbose > 1)
                        rprintf(FINFO,"deleting in %s\n", name);

                for (i=local_file_list->count-1;i>=0;i--) {
                        if (max_delete && deletion_count > max_delete) break;
                        if (!local_file_list->files[i]->basename) continue;
                        if (protocol_version < 19 &&
                            S_ISDIR(local_file_list->files[i]->mode))
                                add_delete_entry(local_file_list->files[i]);
                        if (-1 == flist_find(flist,local_file_list->files[i])) {
                                char *f = f_name(local_file_list->files[i]);
                                if (make_backups && (backup_dir || !is_backup_file(f))) {
                                        (void) make_backup(f);
                                        if (verbose)
                                                rprintf(FINFO, "deleting %s\n", f);
                                } else {
                                        int mode = local_file_list->files[i]->mode;
                                        delete_one(f, S_ISDIR(mode) != 0);
                                }
                                deletion_count++;
                        }
                }
                flist_free(local_file_list);
                free(name);
        }
}


/*
 * get_tmpname() - create a tmp filename for a given filename
 *
 *   If a tmpdir is defined, use that as the directory to
 *   put it in.  Otherwise, the tmp filename is in the same
 *   directory as the given name.  Note that there may be no
 *   directory at all in the given name!
 *
 *   The tmp filename is basically the given filename with a
 *   dot prepended, and .XXXXXX appended (for mkstemp() to
 *   put its unique gunk in).  Take care to not exceed
 *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
 *   the basename basically becomes 8 chars longer. In that
 *   case, the original name is shortened sufficiently to
 *   make it all fit.
 *
 *   Of course, there's no real reason for the tmp name to
 *   look like the original, except to satisfy us humans.
 *   As long as it's unique, rsync will work.
 */

static int get_tmpname(char *fnametmp, char *fname)
{
        char *f;
        int     length = 0;
        int     maxname;

        if (tmpdir) {
                strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
                length = strlen(fnametmp);
                fnametmp[length++] = '/';
                fnametmp[length] = '\0';        /* always NULL terminated */
        }

        if ((f = strrchr(fname, '/')) != NULL) {
                ++f;
                if (!tmpdir) {
                        length = f - fname;
                        /* copy up to and including the slash */
                        strlcpy(fnametmp, fname, length + 1);
                }
        } else {
                f = fname;
        }
        fnametmp[length++] = '.';
        fnametmp[length] = '\0';                /* always NULL terminated */

        maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);

        if (maxname < 1) {
                rprintf(FERROR, "temporary filename too long: %s\n", fname);
                fnametmp[0] = '\0';
                return 0;
        }

        strlcpy(fnametmp + length, f, maxname);
        strcat(fnametmp + length, ".XXXXXX");

        return 1;
}


static int receive_data(int f_in,struct map_struct *buf,int fd,char *fname,
                        OFF_T total_size)
{
        int i;
        struct sum_struct sum;
        unsigned int len;
        OFF_T offset = 0;
        OFF_T offset2;
        char *data;
        static char file_sum1[MD4_SUM_LENGTH];
        static char file_sum2[MD4_SUM_LENGTH];
        char *map=NULL;

        read_sum_head(f_in, &sum);

        sum_init();

        for (i=recv_token(f_in,&data); i != 0; i=recv_token(f_in,&data)) {
                if (do_progress)
                        show_progress(offset, total_size);

                if (i > 0) {
                        extern int cleanup_got_literal;

                        if (verbose > 3) {
                                rprintf(FINFO,"data recv %d at %.0f\n",
                                        i,(double)offset);
                        }

                        stats.literal_data += i;
                        cleanup_got_literal = 1;

                        sum_update(data,i);

                        if (fd != -1 && write_file(fd,data,i) != i) {
                                rprintf(FERROR, "write failed on %s: %s\n",
                                        full_fname(fname), strerror(errno));
                                exit_cleanup(RERR_FILEIO);
                        }
                        offset += i;
                        continue;
                }

                i = -(i+1);
                offset2 = i*(OFF_T)sum.blength;
                len = sum.blength;
                if (i == (int) sum.count-1 && sum.remainder != 0)
                        len = sum.remainder;

                stats.matched_data += len;

                if (verbose > 3)
                        rprintf(FINFO,"chunk[%d] of size %d at %.0f offset=%.0f\n",
                                i,len,(double)offset2,(double)offset);

                if (buf) {
                        map = map_ptr(buf,offset2,len);

                        see_token(map, len);
                        sum_update(map,len);
                }

                if (fd != -1 && write_file(fd,map,len) != (int) len) {
                        rprintf(FERROR, "write failed on %s: %s\n",
                                full_fname(fname), strerror(errno));
                        exit_cleanup(RERR_FILEIO);
                }
                offset += len;
        }

        if (do_progress)
                end_progress(total_size);

        if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
                rprintf(FERROR, "write failed on %s: %s\n",
                        full_fname(fname), strerror(errno));
                exit_cleanup(RERR_FILEIO);
        }

        sum_end(file_sum1);

        read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
        if (verbose > 2) {
                rprintf(FINFO,"got file_sum\n");
        }
        if (fd != -1 && memcmp(file_sum1,file_sum2,MD4_SUM_LENGTH) != 0) {
                return 0;
        }
        return 1;
}


/**
 * main routine for receiver process.
 *
 * Receiver process runs on the same host as the generator process. */
int recv_files(int f_in,struct file_list *flist,char *local_name,int f_gen)
{
        int fd1,fd2;
        STRUCT_STAT st;
        char *fname;
        char template[MAXPATHLEN];
        char fnametmp[MAXPATHLEN];
        char *fnamecmp;
        char fnamecmpbuf[MAXPATHLEN];
        struct map_struct *buf;
        int i;
        struct file_struct *file;
        int phase=0;
        int recv_ok;
        extern struct stats stats;
        extern int preserve_perms;
        extern int delete_after;
        extern int orig_umask;
        struct stats initial_stats;

        if (verbose > 2) {
                rprintf(FINFO,"recv_files(%d) starting\n",flist->count);
        }

        while (1) {
                cleanup_disable();

                i = read_int(f_in);
                if (i == -1) {
                        if (phase==0) {
                                phase++;
                                csum_length = SUM_LENGTH;
                                if (verbose > 2)
                                        rprintf(FINFO,"recv_files phase=%d\n",phase);
                                write_int(f_gen,-1);
                                continue;
                        }
                        break;
                }

                if (i < 0 || i >= flist->count) {
                        rprintf(FERROR,"Invalid file index %d in recv_files (count=%d)\n",
                                i, flist->count);
                        exit_cleanup(RERR_PROTOCOL);
                }

                file = flist->files[i];
                fname = f_name(file);

                stats.num_transferred_files++;
                stats.total_transferred_size += file->length;

                if (local_name)
                        fname = local_name;

                if (dry_run) {
                        if (!am_server && verbose) {    /* log transfer */
                                rprintf(FINFO, "%s\n", fname);
                        }
                        continue;
                }

                initial_stats = stats;

                if (verbose > 2)
                        rprintf(FINFO,"recv_files(%s)\n",fname);

                fnamecmp = fname;

                /* open the file */
                fd1 = do_open(fnamecmp, O_RDONLY, 0);

                if ((fd1 == -1) && (compare_dest != NULL)) {
                        /* try the file at compare_dest instead */
                        snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",
                                                compare_dest,fname);
                        fnamecmp = fnamecmpbuf;
                        fd1 = do_open(fnamecmp, O_RDONLY, 0);
                }

                if (fd1 != -1 && do_fstat(fd1,&st) != 0) {
                        rprintf(FERROR, "fstat %s failed: %s\n",
                                full_fname(fnamecmp), strerror(errno));
                        receive_data(f_in,NULL,-1,NULL,file->length);
                        close(fd1);
                        continue;
                }

                if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
                        /* this special handling for directories
                         * wouldn't be necessary if robust_rename()
                         * and the underlying robust_unlink could cope
                         * with directories
                         */
                        rprintf(FERROR,"recv_files: %s is a directory\n",
                                full_fname(fnamecmp));
                        receive_data(f_in, NULL, -1, NULL, file->length);
                        close(fd1);
                        continue;
                }

                if (fd1 != -1 && !S_ISREG(st.st_mode)) {
                        close(fd1);
                        fd1 = -1;
                        buf = NULL;
                }

                if (fd1 != -1 && !preserve_perms) {
                        /* if the file exists already and we aren't preserving
                         * permissions then act as though the remote end sent
                         * us the file permissions we already have */
                        file->mode = st.st_mode;
                }

                if (fd1 != -1 && st.st_size > 0) {
                        buf = map_file(fd1,st.st_size);
                        if (verbose > 2)
                                rprintf(FINFO,"recv mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
                } else {
                        buf = NULL;
                }

                if (!get_tmpname(fnametmp,fname)) {
                        if (buf) unmap_file(buf);
                        if (fd1 != -1) close(fd1);
                        continue;
                }

                strlcpy(template, fnametmp, sizeof(template));

                /* we initially set the perms without the
                 * setuid/setgid bits to ensure that there is no race
                 * condition. They are then correctly updated after
                 * the lchown. Thanks to snabb@epipe.fi for pointing
                 * this out.  We also set it initially without group
                 * access because of a similar race condition. */
                fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);

                /* in most cases parent directories will already exist
                 * because their information should have been previously
                 * transferred, but that may not be the case with -R */
                if (fd2 == -1 && relative_paths && errno == ENOENT &&
                    create_directory_path(fnametmp, orig_umask) == 0) {
                        strlcpy(fnametmp, template, sizeof(fnametmp));
                        fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
                }
                if (fd2 == -1) {
                        rprintf(FERROR, "mkstemp %s failed: %s\n",
                                full_fname(fnametmp), strerror(errno));
                        receive_data(f_in,buf,-1,NULL,file->length);
                        if (buf) unmap_file(buf);
                        if (fd1 != -1) close(fd1);
                        continue;
                }

                cleanup_set(fnametmp, fname, file, buf, fd1, fd2);

                if (!am_server && verbose) {    /* log transfer */
                        rprintf(FINFO, "%s\n", fname);
                }

                /* recv file data */
                recv_ok = receive_data(f_in,buf,fd2,fname,file->length);

                log_recv(file, &initial_stats);

                if (buf) unmap_file(buf);
                if (fd1 != -1) {
                        close(fd1);
                }
                close(fd2);

                if (verbose > 2)
                        rprintf(FINFO,"renaming %s to %s\n",fnametmp,fname);

                finish_transfer(fname, fnametmp, file);

                cleanup_disable();

                if (!recv_ok) {
                        if (csum_length == SUM_LENGTH) {
                                rprintf(FERROR,"ERROR: file corruption in %s. File changed during transfer?\n",
                                        full_fname(fname));
                        } else {
                                if (verbose > 1)
                                        rprintf(FINFO,"redoing %s(%d)\n",fname,i);
                                write_int(f_gen,i);
                        }
                }
        }

        if (delete_after) {
                if (recurse && delete_mode && !local_name && flist->count>0) {
                        delete_files(flist);
                }
        }

        if (preserve_hard_links)
                do_hard_links();

        /* now we need to fix any directory permissions that were
         * modified during the transfer */
        for (i = 0; i < flist->count; i++) {
                file = flist->files[i];
                if (!file->basename || !S_ISDIR(file->mode)) continue;
                recv_generator(local_name?local_name:f_name(file),flist,i,-1);
        }

        if (verbose > 2)
                rprintf(FINFO,"recv_files finished\n");

        return 0;
}