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OS/2 Shareware BBS: 35 Internet
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rsync221.zip
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generator.c
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1999-03-04
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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 dry_run;
extern int relative_paths;
extern int preserve_links;
extern int am_root;
extern int preserve_devices;
extern int preserve_hard_links;
extern int update_only;
extern int whole_file;
extern int block_size;
extern int csum_length;
extern int ignore_times;
extern int io_timeout;
extern int remote_version;
extern int always_checksum;
/* choose whether to skip a particular file */
static int skip_file(char *fname,
struct file_struct *file, STRUCT_STAT *st)
{
if (st->st_size != file->length) {
return 0;
}
/* if always checksum is set then we use the checksum instead
of the file time to determine whether to sync */
if (always_checksum && S_ISREG(st->st_mode)) {
char sum[MD4_SUM_LENGTH];
file_checksum(fname,sum,st->st_size);
return (memcmp(sum,file->sum,csum_length) == 0);
}
if (ignore_times) {
return 0;
}
return (st->st_mtime == file->modtime);
}
/* use a larger block size for really big files */
static int adapt_block_size(struct file_struct *file, int bsize)
{
int ret;
if (bsize != BLOCK_SIZE) return bsize;
ret = file->length / (10000); /* rough heuristic */
ret = ret & ~15; /* multiple of 16 */
if (ret < bsize) ret = bsize;
if (ret > CHUNK_SIZE/2) ret = CHUNK_SIZE/2;
return ret;
}
/*
send a sums struct down a fd
*/
static void send_sums(struct sum_struct *s,int f_out)
{
int i;
/* tell the other guy how many we are going to be doing and how many
bytes there are in the last chunk */
write_int(f_out,s?s->count:0);
write_int(f_out,s?s->n:block_size);
write_int(f_out,s?s->remainder:0);
if (s)
for (i=0;i<s->count;i++) {
write_int(f_out,s->sums[i].sum1);
write_buf(f_out,s->sums[i].sum2,csum_length);
}
}
/*
generate a stream of signatures/checksums that describe a buffer
generate approximately one checksum every n bytes
*/
static struct sum_struct *generate_sums(struct map_struct *buf,OFF_T len,int n)
{
int i;
struct sum_struct *s;
int count;
int block_len = n;
int remainder = (len%block_len);
OFF_T offset = 0;
count = (len+(block_len-1))/block_len;
s = (struct sum_struct *)malloc(sizeof(*s));
if (!s) out_of_memory("generate_sums");
s->count = count;
s->remainder = remainder;
s->n = n;
s->flength = len;
if (count==0) {
s->sums = NULL;
return s;
}
if (verbose > 3)
rprintf(FINFO,"count=%d rem=%d n=%d flength=%d\n",
s->count,s->remainder,s->n,(int)s->flength);
s->sums = (struct sum_buf *)malloc(sizeof(s->sums[0])*s->count);
if (!s->sums) out_of_memory("generate_sums");
for (i=0;i<count;i++) {
int n1 = MIN(len,n);
char *map = map_ptr(buf,offset,n1);
s->sums[i].sum1 = get_checksum1(map,n1);
get_checksum2(map,n1,s->sums[i].sum2);
s->sums[i].offset = offset;
s->sums[i].len = n1;
s->sums[i].i = i;
if (verbose > 3)
rprintf(FINFO,"chunk[%d] offset=%d len=%d sum1=%08x\n",
i,(int)s->sums[i].offset,s->sums[i].len,s->sums[i].sum1);
len -= n1;
offset += n1;
}
return s;
}
void recv_generator(char *fname,struct file_list *flist,int i,int f_out)
{
int fd;
STRUCT_STAT st;
struct map_struct *buf;
struct sum_struct *s;
int statret;
struct file_struct *file = flist->files[i];
char *fnamecmp;
char fnamecmpbuf[MAXPATHLEN];
extern char *compare_dest;
extern int list_only;
if (list_only) return;
if (verbose > 2)
rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i);
statret = link_stat(fname,&st);
if (S_ISDIR(file->mode)) {
if (dry_run) return;
if (statret == 0 && !S_ISDIR(st.st_mode)) {
if (do_unlink(fname) != 0) {
rprintf(FERROR,"unlink %s : %s\n",fname,strerror(errno));
return;
}
statret = -1;
}
if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
if (!(relative_paths && errno==ENOENT &&
create_directory_path(fname)==0 &&
do_mkdir(fname,file->mode)==0)) {
rprintf(FERROR,"mkdir %s : %s (2)\n",
fname,strerror(errno));
}
}
if (set_perms(fname,file,NULL,0) && verbose)
rprintf(FINFO,"%s/\n",fname);
return;
}
if (preserve_links && S_ISLNK(file->mode)) {
#if SUPPORT_LINKS
char lnk[MAXPATHLEN];
int l;
extern int safe_symlinks;
if (safe_symlinks && unsafe_symlink(file->link, fname)) {
if (verbose) {
rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
fname,file->link);
}
return;
}
if (statret == 0) {
l = readlink(fname,lnk,MAXPATHLEN-1);
if (l > 0) {
lnk[l] = 0;
if (strcmp(lnk,file->link) == 0) {
set_perms(fname,file,&st,1);
return;
}
}
}
delete_file(fname);
if (do_symlink(file->link,fname) != 0) {
rprintf(FERROR,"link %s -> %s : %s\n",
fname,file->link,strerror(errno));
} else {
set_perms(fname,file,NULL,0);
if (verbose) {
rprintf(FINFO,"%s -> %s\n",
fname,file->link);
}
}
#endif
return;
}
#ifdef HAVE_MKNOD
if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
if (statret != 0 ||
st.st_mode != file->mode ||
st.st_rdev != file->rdev) {
delete_file(fname);
if (verbose > 2)
rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
fname,(int)file->mode,(int)file->rdev);
if (do_mknod(fname,file->mode,file->rdev) != 0) {
rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno));
} else {
set_perms(fname,file,NULL,0);
if (verbose)
rprintf(FINFO,"%s\n",fname);
}
} else {
set_perms(fname,file,&st,1);
}
return;
}
#endif
if (preserve_hard_links && check_hard_link(file)) {
if (verbose > 1)
rprintf(FINFO,"%s is a hard link\n",f_name(file));
return;
}
if (!S_ISREG(file->mode)) {
rprintf(FINFO,"skipping non-regular file %s\n",fname);
return;
}
fnamecmp = fname;
if ((statret == -1) && (compare_dest != NULL)) {
/* try the file at compare_dest instead */
int saveerrno = errno;
slprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname);
statret = link_stat(fnamecmpbuf,&st);
if (!S_ISREG(st.st_mode))
statret = -1;
if (statret == -1)
errno = saveerrno;
else
fnamecmp = fnamecmpbuf;
}
if (statret == -1) {
if (errno == ENOENT) {
write_int(f_out,i);
if (!dry_run) send_sums(NULL,f_out);
} else {
if (verbose > 1)
rprintf(FERROR,"recv_generator failed to open %s\n",fname);
}
return;
}
if (!S_ISREG(st.st_mode)) {
if (delete_file(fname) != 0) {
return;
}
/* now pretend the file didn't exist */
write_int(f_out,i);
if (!dry_run) send_sums(NULL,f_out);
return;
}
if (update_only && st.st_mtime > file->modtime && fnamecmp == fname) {
if (verbose > 1)
rprintf(FINFO,"%s is newer\n",fname);
return;
}
if (skip_file(fname, file, &st)) {
set_perms(fname,file,&st,1);
return;
}
if (dry_run) {
write_int(f_out,i);
return;
}
if (whole_file) {
write_int(f_out,i);
send_sums(NULL,f_out);
return;
}
/* open the file */
fd = open(fnamecmp,O_RDONLY);
if (fd == -1) {
rprintf(FERROR,"failed to open %s : %s\n",fnamecmp,strerror(errno));
rprintf(FERROR,"skipping %s\n",fname);
return;
}
if (st.st_size > 0) {
buf = map_file(fd,st.st_size);
} else {
buf = NULL;
}
if (verbose > 3)
rprintf(FINFO,"gen mapped %s of size %d\n",fnamecmp,(int)st.st_size);
s = generate_sums(buf,st.st_size,adapt_block_size(file, block_size));
if (verbose > 2)
rprintf(FINFO,"sending sums for %d\n",i);
write_int(f_out,i);
send_sums(s,f_out);
close(fd);
if (buf) unmap_file(buf);
free_sums(s);
}
void generate_files(int f,struct file_list *flist,char *local_name,int f_recv)
{
int i;
int phase=0;
if (verbose > 2)
rprintf(FINFO,"generator starting pid=%d count=%d\n",
(int)getpid(),flist->count);
for (i = 0; i < flist->count; i++) {
struct file_struct *file = flist->files[i];
mode_t saved_mode = file->mode;
if (!file->basename) continue;
/* we need to ensure that any directories we create have writeable
permissions initially so that we can create the files within
them. This is then fixed after the files are transferred */
if (!am_root && S_ISDIR(file->mode)) {
file->mode |= S_IWUSR; /* user write */
}
recv_generator(local_name?local_name:f_name(file),
flist,i,f);
file->mode = saved_mode;
}
phase++;
csum_length = SUM_LENGTH;
ignore_times=1;
if (verbose > 2)
rprintf(FINFO,"generate_files phase=%d\n",phase);
write_int(f,-1);
/* we expect to just sit around now, so don't exit on a
timeout. If we really get a timeout then the other process should
exit */
io_timeout = 0;
if (remote_version >= 13) {
/* in newer versions of the protocol the files can cycle through
the system more than once to catch initial checksum errors */
for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) {
struct file_struct *file = flist->files[i];
recv_generator(local_name?local_name:f_name(file),
flist,i,f);
}
phase++;
if (verbose > 2)
rprintf(FINFO,"generate_files phase=%d\n",phase);
write_int(f,-1);
}
}