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/*
* Copyright © 2012-2016 Canonical, Inc
*
* Author: Serge Hallyn <serge.hallyn@ubuntu.com>
*
* 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, version 2 of the
* License.
*
*/
#define _XOPEN_SOURCE 500
#include <errno.h>
#include <ftw.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#define min(a,b) (a) < (b) ? (a) : (b)
#define max(a,b) (a) > (b) ? (a) : (b)
static int verbose = 0;
static int convert_uids = 0;
static int convert_gids = 0;
static uid_t srcid;
static uid_t dstid;
static uid_t range;
static uid_t range_uid_max = 0;
static uid_t range_uid_min = ~0;
static gid_t range_gid_max = 0;
static gid_t range_gid_min = ~0;
void usage(void)
{
extern const char *__progname;
printf("Usage: %s [OPTIONS] directory [src dst range]\n\n", __progname);
printf(" -u, --uid convert uids in directory\n");
printf(" -g, --gid convert gids in directory\n");
printf(" -b, --both convert uids and gids in directory\n");
printf(" -r, --range find min,max uid/gid used in directory\n");
printf(" -v, --verbose increate verbosity\n\n");
printf("Note this program always recursively walks all of directory.\n");
printf("If -u,-g, or -b is given, then [src dst range] are required to convert the \n");
printf("ids within the range [src..src+range] to [dst..dst+range].\n\n");
printf("Examples:\n");
printf(" %s -r /path/to/directory # show min/max uid/gid\n", __progname);
printf(" %s -b /path/to/directory 0 100000 500 # map uids and gids up\n", __progname);
printf(" %s -u /path/to/directory 100000 0 500 # map the uids back down\n", __progname);
}
int ftw_callback(const char *fpath, const struct stat *st,
int typeflag, struct FTW *ftw)
{
uid_t new_uid = -1;
uid_t new_gid = -1;
int ret;
range_uid_max = max(range_uid_max, st->st_uid);
range_uid_min = min(range_uid_min, st->st_uid);
range_gid_max = max(range_gid_max, st->st_gid);
range_gid_min = min(range_gid_min, st->st_gid);
if (convert_uids && st->st_uid >= srcid && st->st_uid < srcid+range)
new_uid = (st->st_uid-srcid) + dstid;
if (convert_gids && st->st_gid >= srcid && st->st_gid < srcid+range)
new_gid = (st->st_gid-srcid) + dstid;
if (new_uid != -1 || new_gid != -1) {
ret = lchown(&fpath[ftw->base], new_uid, new_gid);
if (ret) {
fprintf(stderr, "failed to chown %d:%d %s\n",
new_uid, new_gid, fpath);
/* well, let's keep going */
} else {
if (!S_ISLNK(st->st_mode)) {
if (verbose > 1)
fprintf(stderr, "resetting mode to %o on %s\n",
st->st_mode, fpath);
ret = chmod(&fpath[ftw->base], st->st_mode);
if (ret) {
fprintf(stderr, "failed to reset mode %o on %s\n",
st->st_mode, fpath);
/* well, let's keep going */
}
}
if (verbose)
printf("u:%07d=%07d g:%07d=%07d m:%#07o %s %s\n",
st->st_uid, new_uid,
st->st_gid, new_gid,
st->st_mode, fpath, &fpath[ftw->base]);
}
}
return 0;
}
int main(int argc, char *argv[])
{
const char *base;
int show_range = 0;
int opt,ret;
static const struct option long_opts[] = {
{ "help", no_argument, NULL, 'h' },
{ "uids", no_argument, NULL, 'u' },
{ "gids", no_argument, NULL, 'g' },
{ "both", no_argument, NULL, 'b' },
{ "range", no_argument, NULL, 'r' },
{ "verbose", no_argument, NULL, 'v' },
{ NULL, 0, NULL, 0 }
};
while ((opt = getopt_long(argc, argv, "hugbrv", long_opts, NULL)) >= 0) {
switch (opt) {
case 'h': usage(); exit(EXIT_SUCCESS);
case 'u': convert_uids = 1; break;
case 'g': convert_gids = 1; break;
case 'b': convert_uids = convert_gids = 1; break;
case 'r': show_range = 1; break;
case 'v': verbose++; break;
}
}
argc -= optind;
argv += optind;
if (argc < 1) {
usage();
exit(EXIT_FAILURE);
}
base = argv[0];
if (convert_uids || convert_gids) {
if (argc < 4) {
usage();
exit(EXIT_FAILURE);
}
srcid = atoi(argv[1]);
dstid = atoi(argv[2]);
range = atoi(argv[3]);
}
ret = nftw(base, ftw_callback, 1000, FTW_PHYS|FTW_CHDIR);
if (ret < 0) {
fprintf(stderr, "Failed to walk path %s %s\n", base, strerror(errno));
usage();
return EXIT_FAILURE;
}
if (show_range) {
printf("UIDs %d - %d\n"
"GIDs %d - %d\n",
range_uid_min, range_uid_max,
range_gid_min, range_gid_max);
}
return EXIT_SUCCESS;
}
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