99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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#include <pwd.h>
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#include <grp.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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static int usage()
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{
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fprintf(stderr, "Usage: chown [OPTION] <USER>[.GROUP] <FILE1> [FILE2] ...\n");
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fprintf(stderr, " -h: do not follow symlink\n");
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return 10;
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}
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int chown_main(int argc, char **argv)
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{
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int i;
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int fd = 0;
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unsigned int flag = 0;
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if (argc < 3) {
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return usage();
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}
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// Copy argv[1] to 'user' so we can truncate it at the period
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// if a group id specified.
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char user[32];
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char *group = NULL;
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int noFollow = (strcmp(argv[1], "-h") == 0);
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if (noFollow && argc < 4) {
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return usage();
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}
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if(noFollow) {
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flag = O_NOFOLLOW;
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argc--;
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argv++;
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}
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strncpy(user, argv[1], sizeof(user));
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if ((group = strchr(user, '.')) != NULL) {
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*group++ = '\0';
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}
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// Lookup uid (and gid if specified)
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struct passwd *pw;
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struct group *grp = NULL;
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uid_t uid;
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gid_t gid = -1; // passing -1 to chown preserves current group
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pw = getpwnam(user);
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if (pw != NULL) {
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uid = pw->pw_uid;
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} else {
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char* endptr;
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uid = (int) strtoul(user, &endptr, 0);
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if (endptr == user) { // no conversion
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fprintf(stderr, "No such user '%s'\n", user);
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return 10;
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}
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}
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if (group != NULL) {
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grp = getgrnam(group);
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if (grp != NULL) {
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gid = grp->gr_gid;
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} else {
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char* endptr;
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gid = (int) strtoul(group, &endptr, 0);
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if (endptr == group) { // no conversion
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fprintf(stderr, "No such group '%s'\n", group);
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return 10;
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}
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}
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}
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for (i = 2; i < argc; i++) {
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if(((fd = open(argv[i], flag|O_RDONLY)) != -1) ||((fd = open(argv[i], flag|O_WRONLY)) != -1)){
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if (fchown(fd, uid, gid) < 0){
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fprintf(stderr, "Unable to chown %s: %s\n", argv[i], strerror(errno));
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close(fd);
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return 10;
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}
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close(fd);
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} else {
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fprintf(stderr, "Unable to open %s: %s\n", argv[i], strerror(errno));
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return 10;
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}
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}
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return 0;
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}
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