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-rw-r--r--toys/pending/userdel.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/toys/pending/userdel.c b/toys/pending/userdel.c
new file mode 100644
index 00000000..8619a620
--- /dev/null
+++ b/toys/pending/userdel.c
@@ -0,0 +1,116 @@
+/* userdel.c - delete a user
+ *
+ * Copyright 2014 Ashwini Kumar <ak.ashwini1981@gmail.com>
+ *
+ * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/userdel.html
+
+USE_USERDEL(NEWTOY(userdel, "<1>1r", TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
+USE_USERDEL(OLDTOY(deluser, userdel, OPTSTR_userdel, TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
+
+config USERDEL
+ bool "userdel"
+ default n
+ help
+ usage: userdel [-r] USER
+ usage: deluser [-r] USER
+
+ Options:
+ -r remove home directory
+ Delete USER from the SYSTEM
+*/
+
+#define FOR_userdel
+#include "toys.h"
+
+static void update_groupfiles(char *filename, char* username)
+{
+ char *filenamesfx = NULL, *sfx = NULL, *line = NULL;
+ FILE *exfp, *newfp;
+ int ulen = strlen(username);
+ struct flock lock;
+
+ filenamesfx = xmprintf("%s+", filename);
+ sfx = strchr(filenamesfx, '+');
+ exfp = xfopen(filename, "r+");
+
+ *sfx = '-';
+ unlink(filenamesfx);
+ if (link(filename, filenamesfx)) error_msg("Can't create backup file");
+
+ *sfx = '+';
+ lock.l_type = F_WRLCK;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = lock.l_len = 0;
+
+ if (fcntl(fileno(exfp), F_SETLK, &lock) < 0)
+ perror_msg("Couldn't lock file %s",filename);
+
+ lock.l_type = F_UNLCK; //unlocking at a later stage
+
+ newfp = xfopen(filenamesfx, "w+");
+
+ while ((line = get_line(fileno(exfp))) != NULL){
+ sprintf(toybuf, "%s:",username);
+ if (!strncmp(line, toybuf, ulen+1)) goto LOOP;
+ else {
+ char *n, *p = strrchr(line, ':');
+
+ if (p && *++p && (n = strstr(p, username))) {
+ do {
+ if (n[ulen] == ',') {
+ *n = '\0';
+ n += ulen + 1;
+ fprintf(newfp, "%s%s\n", line, n);
+ break;
+ } else if (!n[ulen]) {
+ if (n[-1] == ',') n[-1] = *n = '\0';
+ if (n[-1] == ':') *n = '\0';
+ fprintf(newfp, "%s%s\n", line, n);
+ break;
+ } else n += ulen;
+ } while (*n && (n=strstr(n, username)));
+ if (!n) fprintf(newfp, "%s\n", line);
+ } else fprintf(newfp, "%s\n", line);
+ }
+LOOP:
+ free(line);
+ }
+ fcntl(fileno(exfp), F_SETLK, &lock);
+ fclose(exfp);
+ errno = 0;
+ fflush(newfp);
+ fsync(fileno(newfp));
+ fclose(newfp);
+ rename(filenamesfx, filename);
+ if (errno){
+ perror_msg("File Writing/Saving failed: ");
+ unlink(filenamesfx);
+ }
+ free(filenamesfx);
+}
+
+void userdel_main(void)
+{
+ struct passwd *pwd = NULL;
+
+ pwd = xgetpwnam(*toys.optargs);
+ update_password("/etc/passwd", pwd->pw_name, NULL);
+ update_password("/etc/shadow", pwd->pw_name, NULL);
+
+ // delete the group named USER, and remove user from group.
+ // could update_password() be used for this?
+ // not a good idea, as update_passwd() updates one entry at a time
+ // in this case it will be modifying the files as many times the
+ // USER appears in group database files. So the customized version
+ // of update_passwd() is here.
+ update_groupfiles("/etc/group", *toys.optargs);
+ update_groupfiles("/etc/gshadow", *toys.optargs);
+
+ if (toys.optflags & FLAG_r) {
+ char *arg[] = {"rm", "-fr", pwd->pw_dir, NULL, NULL};
+
+ sprintf(toybuf, "/var/spool/mail/%s",pwd->pw_name);
+ arg[3] = toybuf;
+ xexec(arg);
+ }
+}