1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 /*
27 * Utility functions used by the ipmgmtd daemon.
28 */
29
30 #include <stddef.h>
31 #include <stdlib.h>
32 #include <stdio.h>
33 #include <syslog.h>
34 #include <stdarg.h>
35 #include <unistd.h>
36 #include <errno.h>
37 #include "ipmgmt_impl.h"
38
39 #define IPMGMT_BUFSIZ 1024
40
41 void
ipmgmt_log(int pri,const char * fmt,...)42 ipmgmt_log(int pri, const char *fmt, ...)
43 {
44 va_list alist;
45
46 va_start(alist, fmt);
47 vsyslog(pri, fmt, alist);
48 va_end(alist);
49 }
50
51 /*
52 * Copy a source file to a new destination. The source file will be
53 * removed if rdonly is false (i.e., used when the source file resides
54 * on a read-only file system).
55 *
56 * Returns 0 on success and errno on failure.
57 */
58 int
ipmgmt_cpfile(const char * src,const char * dst,boolean_t rdonly)59 ipmgmt_cpfile(const char *src, const char *dst, boolean_t rdonly)
60 {
61 struct stat statbuf;
62 FILE *sfp, *dfp;
63 char buf[IPMGMT_BUFSIZ];
64 int err = 0;
65
66 errno = 0;
67 /*
68 * Attempt to open the destination file first since we
69 * want to optimize for the case where it is read-only
70 * and will return EROFS.
71 */
72 if ((dfp = fopen(dst, "w+")) == NULL)
73 return (errno);
74
75 /*
76 * Require that the source file exists.
77 */
78 if (stat(src, &statbuf) != 0) {
79 err = errno;
80 (void) fclose(dfp);
81 return (err);
82 }
83 if ((sfp = fopen(src, "r")) == NULL) {
84 err = errno;
85 (void) fclose(dfp);
86 return (err);
87 }
88
89 /*
90 * Copy the file.
91 */
92 while (fgets(buf, sizeof (buf), sfp) != NULL && errno == 0) {
93 (void) fputs(buf, dfp);
94 if (errno != 0)
95 break;
96 }
97 if (errno != 0)
98 err = errno;
99 else if (fflush(dfp) == EOF)
100 err = errno;
101
102 (void) fclose(sfp);
103 (void) fclose(dfp);
104
105 /*
106 * If any error occurred, then remove the destination file.
107 */
108 if (err != 0) {
109 (void) unlink(dst);
110 return (err);
111 }
112
113 /*
114 * Make sure the file attributes are correct.
115 */
116 if (chmod(dst, IPADM_FILE_MODE) != 0 ||
117 chown(dst, UID_NETADM, GID_NETADM) != 0) {
118 err = errno;
119 (void) unlink(dst);
120 return (err);
121 }
122
123 /*
124 * If the source file does not reside on a read-only file system
125 * then remove it.
126 */
127 if (!rdonly)
128 (void) unlink(src);
129
130 return (0);
131 }
132