+/*
+ * Compares two struct pwds.
+ */
+int
+pw_equal(const struct passwd *pw1, const struct passwd *pw2)
+{
+ return (strcmp(pw1->pw_name, pw2->pw_name) == 0 &&
+ pw1->pw_uid == pw2->pw_uid &&
+ pw1->pw_gid == pw2->pw_gid &&
+ strcmp(pw1->pw_class, pw2->pw_class) == 0 &&
+ pw1->pw_change == pw2->pw_change &&
+ pw1->pw_expire == pw2->pw_expire &&
+ strcmp(pw1->pw_gecos, pw2->pw_gecos) == 0 &&
+ strcmp(pw1->pw_dir, pw2->pw_dir) == 0 &&
+ strcmp(pw1->pw_shell, pw2->pw_shell) == 0);
+}
+
+/*
+ * Make a passwd line out of a struct passwd.
+ */
+char *
+pw_make(const struct passwd *pw)
+{
+ char *line;
+
+ asprintf(&line, "%s:%s:%ju:%ju:%s:%ju:%ju:%s:%s:%s", pw->pw_name,
+ pw->pw_passwd, (uintmax_t)pw->pw_uid, (uintmax_t)pw->pw_gid,
+ pw->pw_class, (uintmax_t)pw->pw_change, (uintmax_t)pw->pw_expire,
+ pw->pw_gecos, pw->pw_dir, pw->pw_shell);
+ return (line);
+}
+
+/*
+ * Make a passwd line (in v7 format) out of a struct passwd
+ */
+char *
+pw_make_v7(const struct passwd *pw)
+{
+ char *line;
+
+ asprintf(&line, "%s:*:%ju:%ju:%s:%s:%s", pw->pw_name,
+ (uintmax_t)pw->pw_uid, (uintmax_t)pw->pw_gid,
+ pw->pw_gecos, pw->pw_dir, pw->pw_shell);
+ return (line);
+}
+
+/*
+ * Copy password file from one descriptor to another, replacing, deleting
+ * or adding a single record on the way.
+ */
+int
+pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw)
+{
+ char buf[8192], *end, *line, *p, *q, *r, t;
+ struct passwd *fpw;
+ const struct passwd *spw;
+ size_t len;
+ int eof, readlen;
+
+ if (old_pw == NULL && pw == NULL)
+ return (-1);
+
+ spw = old_pw;
+ /* deleting a user */
+ if (pw == NULL) {
+ line = NULL;
+ } else {
+ if ((line = pw_make(pw)) == NULL)
+ return (-1);
+ }
+
+ /* adding a user */
+ if (spw == NULL)
+ spw = pw;
+
+ eof = 0;
+ len = 0;
+ p = q = end = buf;
+ for (;;) {
+ /* find the end of the current line */
+ for (p = q; q < end && *q != '\0'; ++q)
+ if (*q == '\n')
+ break;
+
+ /* if we don't have a complete line, fill up the buffer */
+ if (q >= end) {
+ if (eof)
+ break;
+ if ((size_t)(q - p) >= sizeof(buf)) {
+ warnx("passwd line too long");
+ errno = EINVAL; /* hack */
+ goto err;
+ }
+ if (p < end) {
+ q = memmove(buf, p, end - p);
+ end -= p - buf;
+ } else {
+ p = q = end = buf;
+ }
+ readlen = read(ffd, end, sizeof(buf) - (end - buf));
+ if (readlen == -1)
+ goto err;
+ else
+ len = (size_t)readlen;
+ if (len == 0 && p == buf)
+ break;
+ end += len;
+ len = end - buf;
+ if (len < (ssize_t)sizeof(buf)) {
+ eof = 1;
+ if (len > 0 && buf[len - 1] != '\n')
+ ++len, *end++ = '\n';
+ }
+ continue;
+ }
+
+ /* is it a blank line or a comment? */
+ for (r = p; r < q && isspace(*r); ++r)
+ /* nothing */ ;
+ if (r == q || *r == '#') {
+ /* yep */
+ if (write(tfd, p, q - p + 1) != q - p + 1)
+ goto err;
+ ++q;
+ continue;
+ }
+
+ /* is it the one we're looking for? */
+
+ t = *q;
+ *q = '\0';
+
+ fpw = pw_scan(r, PWSCAN_MASTER);
+
+ /*
+ * fpw is either the struct passwd for the current line,
+ * or NULL if the line is malformed.
+ */
+
+ *q = t;
+ if (fpw == NULL || strcmp(fpw->pw_name, spw->pw_name) != 0) {
+ /* nope */
+ if (fpw != NULL)
+ free(fpw);
+ if (write(tfd, p, q - p + 1) != q - p + 1)
+ goto err;
+ ++q;
+ continue;
+ }
+ if (old_pw && !pw_equal(fpw, old_pw)) {
+ warnx("entry inconsistent");
+ free(fpw);
+ errno = EINVAL; /* hack */
+ goto err;
+ }
+ free(fpw);
+
+ /* it is, replace or remove it */
+ if (line != NULL) {
+ len = strlen(line);
+ if (write(tfd, line, len) != (int)len)
+ goto err;
+ } else {
+ /* when removed, avoid the \n */
+ q++;
+ }
+ /* we're done, just copy the rest over */
+ for (;;) {
+ if (write(tfd, q, end - q) != end - q)
+ goto err;
+ q = buf;
+ readlen = read(ffd, buf, sizeof(buf));
+ if (readlen == 0)
+ break;
+ else
+ len = (size_t)readlen;
+ if (readlen == -1)
+ goto err;
+ end = buf + len;
+ }
+ goto done;
+ }
+
+ /* if we got here, we didn't find the old entry */
+ if (line == NULL) {
+ errno = ENOENT;
+ goto err;
+ }
+ len = strlen(line);
+ if ((size_t)write(tfd, line, len) != len ||
+ write(tfd, "\n", 1) != 1)
+ goto err;
+ done:
+ if (line != NULL)
+ free(line);
+ return (0);
+ err:
+ if (line != NULL)
+ free(line);
+ return (-1);
+}
+
+/*
+ * Return the current value of tempname.
+ */
+const char *
+pw_tempname(void)
+{
+
+ return (tempname);
+}
+
+/*
+ * Duplicate a struct passwd.
+ */
+struct passwd *
+pw_dup(const struct passwd *pw)
git.ckatri.com / pw-darwin.git / blobdiff