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117 lines
3.1 KiB
117 lines
3.1 KiB
4 months ago
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/* userdel.c - delete a user
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*
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* Copyright 2014 Ashwini Kumar <ak.ashwini1981@gmail.com>
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*
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* See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/userdel.html
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USE_USERDEL(NEWTOY(userdel, "<1>1r", TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
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USE_USERDEL(OLDTOY(deluser, userdel, TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
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config USERDEL
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bool "userdel"
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default n
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help
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usage: userdel [-r] USER
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usage: deluser [-r] USER
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Delete USER from the SYSTEM
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-r remove home directory
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*/
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#define FOR_userdel
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#include "toys.h"
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static void update_groupfiles(char *filename, char* username)
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{
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char *filenamesfx = NULL, *sfx = NULL, *line = NULL;
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FILE *exfp, *newfp;
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int ulen = strlen(username);
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struct flock lock;
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filenamesfx = xmprintf("%s+", filename);
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sfx = strchr(filenamesfx, '+');
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exfp = xfopen(filename, "r+");
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*sfx = '-';
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unlink(filenamesfx);
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if (link(filename, filenamesfx)) error_msg("Can't create backup file");
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*sfx = '+';
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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lock.l_start = lock.l_len = 0;
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if (fcntl(fileno(exfp), F_SETLK, &lock) < 0)
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perror_msg("Couldn't lock file %s",filename);
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lock.l_type = F_UNLCK; //unlocking at a later stage
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newfp = xfopen(filenamesfx, "w+");
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while ((line = get_line(fileno(exfp))) != NULL){
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sprintf(toybuf, "%s:",username);
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if (!strncmp(line, toybuf, ulen+1)) goto LOOP;
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else {
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char *n, *p = strrchr(line, ':');
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if (p && *++p && (n = strstr(p, username))) {
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do {
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if (n[ulen] == ',') {
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*n = '\0';
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n += ulen + 1;
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fprintf(newfp, "%s%s\n", line, n);
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break;
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} else if (!n[ulen]) {
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if (n[-1] == ',') n[-1] = *n = '\0';
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if (n[-1] == ':') *n = '\0';
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fprintf(newfp, "%s%s\n", line, n);
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break;
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} else n += ulen;
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} while (*n && (n=strstr(n, username)));
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if (!n) fprintf(newfp, "%s\n", line);
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} else fprintf(newfp, "%s\n", line);
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}
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LOOP:
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free(line);
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}
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fcntl(fileno(exfp), F_SETLK, &lock);
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fclose(exfp);
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errno = 0;
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fflush(newfp);
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fsync(fileno(newfp));
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fclose(newfp);
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rename(filenamesfx, filename);
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if (errno){
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perror_msg("File Writing/Saving failed: ");
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unlink(filenamesfx);
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}
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free(filenamesfx);
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}
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void userdel_main(void)
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{
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struct passwd *pwd = NULL;
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pwd = xgetpwnam(*toys.optargs);
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update_password("/etc/passwd", pwd->pw_name, NULL);
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update_password("/etc/shadow", pwd->pw_name, NULL);
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// delete the group named USER, and remove user from group.
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// could update_password() be used for this?
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// not a good idea, as update_passwd() updates one entry at a time
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// in this case it will be modifying the files as many times the
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// USER appears in group database files. So the customized version
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// of update_passwd() is here.
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update_groupfiles("/etc/group", *toys.optargs);
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update_groupfiles("/etc/gshadow", *toys.optargs);
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if (toys.optflags & FLAG_r) {
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char *arg[] = {"rm", "-fr", pwd->pw_dir, NULL, NULL};
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sprintf(toybuf, "/var/spool/mail/%s",pwd->pw_name);
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arg[3] = toybuf;
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xexec(arg);
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}
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}
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