Use __SCCSID() for SCCS IDs.

[pw-darwin.git] / libutil / pw_util.c

diff --git a/libutil/pw_util.c b/libutil/pw_util.c
index 6013e6d0640fa8de0a9817f6439683d3c577a6d8..112b6d8af45a026ccc2b005f1b80c48108d35d10 100644 (file)
--- a/libutil/pw_util.c
+++ b/libutil/pw_util.c
@@ -1,4 +1,6 @@
-/*-
+/*--
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993, 1994
  *     The Regents of the University of California.  All rights reserved.
  * Copyright (c) 2002 Networks Associates Technology, Inc.
@@ -17,7 +19,7 @@
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
+ * 3. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
@@ -34,13 +36,9 @@
  * SUCH DAMAGE.
  */
 
-#ifndef lint
-#if 0
-static const char sccsid[] = "@(#)pw_util.c    8.3 (Berkeley) 4/2/94";
-#endif
-static const char rcsid[] =
-  "$FreeBSD$";
-#endif /* not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+__SCCSID("@(#)pw_util.c        8.3 (Berkeley) 4/2/94");
 
 /*
  * This file is used by all the "password" programs; vipw(8), chpass(1),
@@ -58,7 +56,6 @@ static const char rcsid[] =
 #include <err.h>
 #include <fcntl.h>
 #include <inttypes.h>
-#include <libgen.h>
 #include <paths.h>
 #include <pwd.h>
 #include <signal.h>
@@ -96,7 +93,6 @@ pw_init(const char *dir, const char *master)
 #if 0
        struct rlimit rlim;
 #endif
-       struct stat st;
 
        if (dir == NULL) {
                strcpy(passwd_dir, _PATH_ETC);
@@ -124,14 +120,6 @@ pw_init(const char *dir, const char *master)
                strcpy(masterpasswd, master);
        }
 
-       if (stat(masterpasswd, &st) == -1)
-               return (-1);
-
-       if (S_ISDIR(st.st_mode)) {
-               errno = EISDIR;
-               return (-1);
-       }
-
        /*
         * The code that follows is extremely disruptive to the calling
         * process, and is therefore disabled until someone can conceive
@@ -188,11 +176,8 @@ pw_lock(void)
        for (;;) {
                struct stat st;
 
-               lockfd = open(masterpasswd, O_RDONLY, 0);
-               if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1)
-                       err(1, "%s", masterpasswd);
-               /* XXX vulnerable to race conditions */
-               if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
+               lockfd = flopen(masterpasswd, O_RDONLY|O_NONBLOCK|O_CLOEXEC, 0);
+               if (lockfd == -1) {
                        if (errno == EWOULDBLOCK) {
                                errx(1, "the password db file is busy");
                        } else {
@@ -238,7 +223,7 @@ pw_tmp(int mfd)
                errno = ENAMETOOLONG;
                return (-1);
        }
-       if ((tfd = mkstemp(tempname)) == -1)
+       if ((tfd = mkostemp(tempname, 0)) == -1)
                return (-1);
        if (mfd != -1) {
                while ((nr = read(mfd, buf, sizeof(buf))) > 0)
@@ -327,7 +312,7 @@ pw_edit(int notsetuid)
                        (void)setuid(getuid());
                }
                errno = 0;
-               execlp(editor, basename(editor), tempname, (char *)NULL);
+               execlp(editor, editor, tempname, (char *)NULL);
                _exit(errno);
        default:
                /* parent */
@@ -440,11 +425,12 @@ pw_make_v7(const struct passwd *pw)
 int
 pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw)
 {
-       char buf[8192], *end, *line, *p, *q, *r, t;
+       char *buf, *end, *line, *p, *q, *r, *tmp;
        struct passwd *fpw;
        const struct passwd *spw;
-       size_t len;
+       size_t len, size;
        int eof, readlen;
+       char t;
 
        if (old_pw == NULL && pw == NULL)
                        return (-1);
@@ -462,6 +448,10 @@ pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw)
        if (spw == NULL)
                spw = pw;
 
+       /* initialize the buffer */
+       if ((buf = malloc(size = 1024)) == NULL)
+               goto err;
+
        eof = 0;
        len = 0;
        p = q = end = buf;
@@ -475,10 +465,16 @@ pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw)
                if (q >= end) {
                        if (eof)
                                break;
-                       if ((size_t)(q - p) >= sizeof(buf)) {
-                               warnx("passwd line too long");
-                               errno = EINVAL; /* hack */
-                               goto err;
+                       while ((size_t)(q - p) >= size) {
+                               if ((tmp = reallocarray(buf, 2, size)) == NULL) {
+                                       warnx("passwd line too long");
+                                       goto err;
+                               }
+                               p = tmp + (p - buf);
+                               q = tmp + (q - buf);
+                               end = tmp + (end - buf);
+                               buf = tmp;
+                               size = size * 2;
                        }
                        if (p < end) {
                                q = memmove(buf, p, end - p);
@@ -486,7 +482,7 @@ pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw)
                        } else {
                                p = q = end = buf;
                        }
-                       readlen = read(ffd, end, sizeof(buf) - (end - buf));
+                       readlen = read(ffd, end, size - (end - buf));
                        if (readlen == -1)
                                goto err;
                        else
@@ -495,7 +491,7 @@ pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw)
                                break;
                        end += len;
                        len = end - buf;
-                       if (len < (ssize_t)sizeof(buf)) {
+                       if (len < size) {
                                eof = 1;
                                if (len > 0 && buf[len - 1] != '\n')
                                        ++len, *end++ = '\n';
@@ -558,7 +554,7 @@ pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw)
                        if (write(tfd, q, end - q) != end - q)
                                goto err;
                        q = buf;
-                       readlen = read(ffd, buf, sizeof(buf));
+                       readlen = read(ffd, buf, size);
                        if (readlen == 0)
                                break;
                        else
@@ -580,12 +576,12 @@ pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw)
            write(tfd, "\n", 1) != 1)
                goto err;
  done:
-       if (line != NULL)
-               free(line);
+       free(line);
+       free(buf);
        return (0);
  err:
-       if (line != NULL)
-               free(line);
+       free(line);
+       free(buf);
        return (-1);
 }