sender.c

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/*
   Copyright (C) Andrew Tridgell 1996
   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 do_xfers;
extern int am_server;
extern int am_daemon;
extern int log_before_transfer;
extern int log_format_has_i;
extern int daemon_log_format_has_i;
extern int csum_length;
extern int append_mode;
extern int io_error;
extern int allowed_lull;
extern int protocol_version;
extern int remove_sent_files;
extern int updating_basis_file;
extern int make_backups;
extern int do_progress;
extern int inplace;
extern int batch_fd;
extern int write_batch;
extern struct stats stats;
extern struct file_list *the_file_list;
extern char *log_format;


/**
 * @file
 *
 * The sender gets checksums from the generator, calculates deltas,
 * and transmits them to the receiver.  The sender process runs on the
 * machine holding the source files.
 **/

/**
 * Receive the checksums for a buffer
 **/
static struct sum_struct *receive_sums(int f)
{
        struct sum_struct *s;
        int32 i;
        int lull_mod = allowed_lull * 5;
        OFF_T offset = 0;

        if (!(s = new(struct sum_struct)))
                out_of_memory("receive_sums");

        read_sum_head(f, s);

        s->sums = NULL;

        if (verbose > 3) {
                rprintf(FINFO, "count=%.0f n=%ld rem=%ld\n",
                        (double)s->count, (long)s->blength, (long)s->remainder);
        }

        if (append_mode) {
                s->flength = (OFF_T)s->count * s->blength;
                if (s->remainder)
                        s->flength -= s->blength - s->remainder;
                return s;
        }

        if (s->count == 0)
                return(s);

        if (!(s->sums = new_array(struct sum_buf, s->count)))
                out_of_memory("receive_sums");

        for (i = 0; i < s->count; i++) {
                s->sums[i].sum1 = read_int(f);
                read_buf(f, s->sums[i].sum2, s->s2length);

                s->sums[i].offset = offset;
                s->sums[i].flags = 0;

                if (i == s->count-1 && s->remainder != 0)
                        s->sums[i].len = s->remainder;
                else
                        s->sums[i].len = s->blength;
                offset += s->sums[i].len;

                if (allowed_lull && !(i % lull_mod))
                        maybe_send_keepalive();

                if (verbose > 3) {
                        rprintf(FINFO,
                                "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
                                i, s->sums[i].len, (double)s->sums[i].offset,
                                s->sums[i].sum1);
                }
        }

        s->flength = offset;

        return s;
}

void successful_send(int ndx)
{
        char fname[MAXPATHLEN];
        struct file_struct *file;
        unsigned int offset;

        if (ndx < 0 || ndx >= the_file_list->count)
                return;

        file = the_file_list->files[ndx];
        /* The generator might tell us about symlinks we didn't send. */
        if (!(file->flags & FLAG_SENT) && !S_ISLNK(file->mode))
                return;
        if (file->dir.root) {
                offset = stringjoin(fname, sizeof fname,
                                    file->dir.root, "/", NULL);
        } else
                offset = 0;
        f_name(file, fname + offset);
        if (remove_sent_files && do_unlink(fname) == 0 && verbose > 1)
                rprintf(FINFO, "sender removed %s\n", fname + offset);
}

static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
                                uchar fnamecmp_type, char *buf, int len)
{
        write_int(f_out, ndx);
        if (protocol_version < 29)
                return;
        write_shortint(f_out, iflags);
        if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
                write_byte(f_out, fnamecmp_type);
        if (iflags & ITEM_XNAME_FOLLOWS)
                write_vstring(f_out, buf, len);
}

/* This is also used by receive.c with f_out = -1. */
int read_item_attrs(int f_in, int f_out, int ndx, uchar *type_ptr,
                    char *buf, int *len_ptr)
{
        int len;
        uchar fnamecmp_type = FNAMECMP_FNAME;
        int iflags = protocol_version >= 29 ? read_shortint(f_in)
                   : ITEM_TRANSFER | ITEM_MISSING_DATA;

        /* Handle the new keep-alive (no-op) packet. */
        if (ndx == the_file_list->count && iflags == ITEM_IS_NEW)
                ;
        else if (ndx < 0 || ndx >= the_file_list->count) {
                rprintf(FERROR, "Invalid file index: %d (count=%d) [%s]\n",
                        ndx, the_file_list->count, who_am_i());
                exit_cleanup(RERR_PROTOCOL);
        } else if (iflags == ITEM_IS_NEW) {
                rprintf(FERROR, "Invalid itemized flag word: %x [%s]\n",
                        iflags, who_am_i());
                exit_cleanup(RERR_PROTOCOL);
        }

        if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
                fnamecmp_type = read_byte(f_in);
        *type_ptr = fnamecmp_type;

        if (iflags & ITEM_XNAME_FOLLOWS) {
                if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
                        exit_cleanup(RERR_PROTOCOL);
        } else {
                *buf = '\0';
                len = -1;
        }
        *len_ptr = len;

        if (iflags & ITEM_TRANSFER) {
                if (!S_ISREG(the_file_list->files[ndx]->mode)) {
                        rprintf(FERROR,
                                "received request to transfer non-regular file: %d [%s]\n",
                                ndx, who_am_i());
                        exit_cleanup(RERR_PROTOCOL);
                }
        } else if (f_out >= 0) {
                write_ndx_and_attrs(f_out, ndx, iflags,
                                    fnamecmp_type, buf, len);
        }

        return iflags;
}

void send_files(struct file_list *flist, int f_out, int f_in)
{
        int fd = -1;
        struct sum_struct *s;
        struct map_struct *mbuf = NULL;
        STRUCT_STAT st;
        char *fname2, fname[MAXPATHLEN];
        char xname[MAXPATHLEN];
        uchar fnamecmp_type;
        int iflags, xlen;
        struct file_struct *file;
        int phase = 0, max_phase = protocol_version >= 29 ? 2 : 1;
        struct stats initial_stats;
        int save_make_backups = make_backups;
        int itemizing = am_daemon ? daemon_log_format_has_i
                      : !am_server && log_format_has_i;
        int f_xfer = write_batch < 0 ? batch_fd : f_out;
        int i, j;

        if (verbose > 2)
                rprintf(FINFO, "send_files starting\n");

        while (1) {
                unsigned int offset;

                i = read_int(f_in);
                if (i == -1) {
                        if (++phase > max_phase)
                                break;
                        csum_length = SUM_LENGTH;
                        if (verbose > 2)
                                rprintf(FINFO, "send_files phase=%d\n", phase);
                        write_int(f_out, -1);
                        /* For inplace: redo phase turns off the backup
                         * flag so that we do a regular inplace send. */
                        make_backups = 0;
                        append_mode = 0;
                        continue;
                }

                iflags = read_item_attrs(f_in, f_out, i, &fnamecmp_type,
                                         xname, &xlen);
                if (iflags == ITEM_IS_NEW) /* no-op packet */
                        continue;

                file = flist->files[i];
                if (file->dir.root) {
                        /* N.B. We're sure that this fits, so offset is OK. */
                        offset = strlcpy(fname, file->dir.root, sizeof fname);
                        if (!offset || fname[offset-1] != '/')
                                fname[offset++] = '/';
                } else
                        offset = 0;
                fname2 = f_name(file, fname + offset);

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

                if (!(iflags & ITEM_TRANSFER)) {
                        maybe_log_item(file, iflags, itemizing, xname);
                        continue;
                }
                if (phase == 2) {
                        rprintf(FERROR,
                                "got transfer request in phase 2 [%s]\n",
                                who_am_i());
                        exit_cleanup(RERR_PROTOCOL);
                }

                updating_basis_file = inplace && (protocol_version >= 29
                        ? fnamecmp_type == FNAMECMP_FNAME : !make_backups);

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

                if (!do_xfers) { /* log the transfer */
                        if (!am_server && log_format)
                                log_item(file, &stats, iflags, NULL);
                        write_ndx_and_attrs(f_out, i, iflags, fnamecmp_type,
                                            xname, xlen);
                        continue;
                }

                initial_stats = stats;

                if (!(s = receive_sums(f_in))) {
                        io_error |= IOERR_GENERAL;
                        rprintf(FERROR, "receive_sums failed\n");
                        return;
                }

                fd = do_open(fname, O_RDONLY, 0);
                if (fd == -1) {
                        if (errno == ENOENT) {
                                enum logcode c = am_daemon
                                    && protocol_version < 28 ? FERROR
                                                             : FINFO;
                                io_error |= IOERR_VANISHED;
                                rprintf(c, "file has vanished: %s\n",
                                        full_fname(fname));
                        } else {
                                io_error |= IOERR_GENERAL;
                                rsyserr(FERROR, errno,
                                        "send_files failed to open %s",
                                        full_fname(fname));
                        }
                        free_sums(s);
                        continue;
                }

                /* map the local file */
                if (do_fstat(fd, &st) != 0) {
                        io_error |= IOERR_GENERAL;
                        rsyserr(FERROR, errno, "fstat failed");
                        free_sums(s);
                        close(fd);
                        return;
                }

                if (st.st_size) {
                        int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
                        mbuf = map_file(fd, st.st_size, read_size, s->blength);
                } else
                        mbuf = NULL;

                if (verbose > 2) {
                        rprintf(FINFO, "send_files mapped %s of size %.0f\n",
                                fname, (double)st.st_size);
                }

                write_ndx_and_attrs(f_out, i, iflags, fnamecmp_type,
                                    xname, xlen);
                write_sum_head(f_xfer, s);

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

                if (log_before_transfer)
                        log_item(file, &initial_stats, iflags, NULL);
                else if (!am_server && verbose && do_progress)
                        rprintf(FINFO, "%s\n", fname2);

                set_compression(fname);

                match_sums(f_xfer, s, mbuf, st.st_size);
                if (do_progress)
                        end_progress(st.st_size);

                if (!log_before_transfer)
                        log_item(file, &initial_stats, iflags, NULL);

                if (mbuf) {
                        j = unmap_file(mbuf);
                        if (j) {
                                io_error |= IOERR_GENERAL;
                                rsyserr(FERROR, j,
                                        "read errors mapping %s",
                                        full_fname(fname));
                        }
                }
                close(fd);

                free_sums(s);

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

                /* Flag that we actually sent this entry. */
                file->flags |= FLAG_SENT;
        }
        make_backups = save_make_backups;

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

        match_report();

        write_int(f_out, -1);
}

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