1/*-
2 * Copyright (C) 1996
3 * David L. Nugent. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#ifndef lint
28static const char rcsid[] =
| 1/*-
2 * Copyright (C) 1996
3 * David L. Nugent. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#ifndef lint
28static const char rcsid[] =
|
30#endif /* not lint */
31
32#include <stdio.h>
33#include <fcntl.h>
34#include <stdlib.h>
35#include <string.h>
36#include <sys/types.h>
37#include <sys/stat.h>
38#include <sys/param.h>
39#include <errno.h>
40#include <unistd.h>
41
42#include "pwupd.h"
43
44int
45extendline(char **buf, int * buflen, int needed)
46{
47 if (needed > *buflen) {
48 char *tmp = realloc(*buf, needed);
49 if (tmp == NULL)
50 return -1;
51 *buf = tmp;
52 *buflen = needed;
53 }
54 return *buflen;
55}
56
57int
58extendarray(char ***buf, int * buflen, int needed)
59{
60 if (needed > *buflen) {
61 char **tmp = realloc(*buf, needed * sizeof(char *));
62 if (tmp == NULL)
63 return -1;
64 *buf = tmp;
65 *buflen = needed;
66 }
67 return *buflen;
68}
69
70
71int
72fileupdate(char const * filename, mode_t fmode, char const * newline, char const * prefix, int pfxlen, int updmode)
73{
74 int rc = 0;
75
76 if (pfxlen <= 1)
77 errno = EINVAL;
78 else {
79 int infd = open(filename, O_RDWR | O_CREAT, fmode);
80
81 if (infd != -1) {
82 FILE *infp = fdopen(infd, "r+");
83
84 if (infp == NULL)
85 close(infd);
86 else {
87 int outfd;
88 char file[MAXPATHLEN];
89
90 strcpy(file, filename);
91 strcat(file, ".new");
92 outfd = open(file, O_RDWR | O_CREAT | O_TRUNC | O_EXLOCK, fmode);
93 if (outfd != -1) {
94 FILE *outfp = fdopen(outfd, "w+");
95
96 if (outfp == NULL)
97 close(outfd);
98 else {
99 int updated = UPD_CREATE;
100 int linesize = PWBUFSZ;
101 char *line = malloc(linesize);
102
103 nextline:
104 while (fgets(line, linesize, infp) != NULL) {
105 char *p = strchr(line, '\n');
106
107 while ((p = strchr(line, '\n')) == NULL) {
108 int l;
109 if (extendline(&line, &linesize, linesize + PWBUFSZ) == -1) {
110 int ch;
111 fputs(line, outfp);
112 while ((ch = fgetc(infp)) != EOF) {
113 fputc(ch, outfp);
114 if (ch == '\n')
115 break;
116 }
117 goto nextline;
118 }
119 l = strlen(line);
120 if (fgets(line + l, linesize - l, infp) == NULL)
121 break;
122 }
123 if (*line != '#' && *line != '\n') {
124 if (!updated && strncmp(line, prefix, pfxlen) == 0) {
125 updated = updmode == UPD_REPLACE ? UPD_REPLACE : UPD_DELETE;
126
127 /*
128 * Only actually write changes if updating
129 */
130 if (updmode == UPD_REPLACE)
131 strcpy(line, newline);
132 else if (updmode == UPD_DELETE)
133 continue;
134 }
135 }
136 fputs(line, outfp);
137 }
138
139 /*
140 * Now, we need to decide what to do: If we are in
141 * update mode, and no record was updated, then error If
142 * we are in insert mode, and record already exists,
143 * then error
144 */
145 if (updmode != updated)
146 errno = (updmode == UPD_CREATE) ? EEXIST : ENOENT;
147 else {
148
149 /*
150 * If adding a new record, append it to the end
151 */
152 if (updmode == UPD_CREATE)
153 fputs(newline, outfp);
154
155 /*
156 * Flush the file and check for the result
157 */
158 rc = fflush(outfp) != EOF;
159 if (rc) {
160
161 /*
162 * Copy data back into the
163 * original file and truncate
164 */
165 rewind(infp);
166 rewind(outfp);
167 while (fgets(line, linesize, outfp) != NULL)
168 fputs(line, infp);
169
170 /*
171 * If there was a problem with copying
172 * we will just rename 'file.new'
173 * to 'file'.
174 * This is a gross hack, but we may have
175 * corrupted the original file
176 * Unfortunately, it will lose the inode
177 * and hence the lock.
178 */
179 if (fflush(infp) == EOF || ferror(infp)) {
180 rc = errno; /* Preserve errno for return */
181 rename(file, filename);
182 }
183 else
184 ftruncate(infd, ftell(infp));
185 }
186 }
187 free(line);
188 fclose(outfp);
189 }
190 remove(file);
191 }
192 fclose(infp);
193 }
194 }
195 }
196 return rc;
197}
| 30#endif /* not lint */
31
32#include <stdio.h>
33#include <fcntl.h>
34#include <stdlib.h>
35#include <string.h>
36#include <sys/types.h>
37#include <sys/stat.h>
38#include <sys/param.h>
39#include <errno.h>
40#include <unistd.h>
41
42#include "pwupd.h"
43
44int
45extendline(char **buf, int * buflen, int needed)
46{
47 if (needed > *buflen) {
48 char *tmp = realloc(*buf, needed);
49 if (tmp == NULL)
50 return -1;
51 *buf = tmp;
52 *buflen = needed;
53 }
54 return *buflen;
55}
56
57int
58extendarray(char ***buf, int * buflen, int needed)
59{
60 if (needed > *buflen) {
61 char **tmp = realloc(*buf, needed * sizeof(char *));
62 if (tmp == NULL)
63 return -1;
64 *buf = tmp;
65 *buflen = needed;
66 }
67 return *buflen;
68}
69
70
71int
72fileupdate(char const * filename, mode_t fmode, char const * newline, char const * prefix, int pfxlen, int updmode)
73{
74 int rc = 0;
75
76 if (pfxlen <= 1)
77 errno = EINVAL;
78 else {
79 int infd = open(filename, O_RDWR | O_CREAT, fmode);
80
81 if (infd != -1) {
82 FILE *infp = fdopen(infd, "r+");
83
84 if (infp == NULL)
85 close(infd);
86 else {
87 int outfd;
88 char file[MAXPATHLEN];
89
90 strcpy(file, filename);
91 strcat(file, ".new");
92 outfd = open(file, O_RDWR | O_CREAT | O_TRUNC | O_EXLOCK, fmode);
93 if (outfd != -1) {
94 FILE *outfp = fdopen(outfd, "w+");
95
96 if (outfp == NULL)
97 close(outfd);
98 else {
99 int updated = UPD_CREATE;
100 int linesize = PWBUFSZ;
101 char *line = malloc(linesize);
102
103 nextline:
104 while (fgets(line, linesize, infp) != NULL) {
105 char *p = strchr(line, '\n');
106
107 while ((p = strchr(line, '\n')) == NULL) {
108 int l;
109 if (extendline(&line, &linesize, linesize + PWBUFSZ) == -1) {
110 int ch;
111 fputs(line, outfp);
112 while ((ch = fgetc(infp)) != EOF) {
113 fputc(ch, outfp);
114 if (ch == '\n')
115 break;
116 }
117 goto nextline;
118 }
119 l = strlen(line);
120 if (fgets(line + l, linesize - l, infp) == NULL)
121 break;
122 }
123 if (*line != '#' && *line != '\n') {
124 if (!updated && strncmp(line, prefix, pfxlen) == 0) {
125 updated = updmode == UPD_REPLACE ? UPD_REPLACE : UPD_DELETE;
126
127 /*
128 * Only actually write changes if updating
129 */
130 if (updmode == UPD_REPLACE)
131 strcpy(line, newline);
132 else if (updmode == UPD_DELETE)
133 continue;
134 }
135 }
136 fputs(line, outfp);
137 }
138
139 /*
140 * Now, we need to decide what to do: If we are in
141 * update mode, and no record was updated, then error If
142 * we are in insert mode, and record already exists,
143 * then error
144 */
145 if (updmode != updated)
146 errno = (updmode == UPD_CREATE) ? EEXIST : ENOENT;
147 else {
148
149 /*
150 * If adding a new record, append it to the end
151 */
152 if (updmode == UPD_CREATE)
153 fputs(newline, outfp);
154
155 /*
156 * Flush the file and check for the result
157 */
158 rc = fflush(outfp) != EOF;
159 if (rc) {
160
161 /*
162 * Copy data back into the
163 * original file and truncate
164 */
165 rewind(infp);
166 rewind(outfp);
167 while (fgets(line, linesize, outfp) != NULL)
168 fputs(line, infp);
169
170 /*
171 * If there was a problem with copying
172 * we will just rename 'file.new'
173 * to 'file'.
174 * This is a gross hack, but we may have
175 * corrupted the original file
176 * Unfortunately, it will lose the inode
177 * and hence the lock.
178 */
179 if (fflush(infp) == EOF || ferror(infp)) {
180 rc = errno; /* Preserve errno for return */
181 rename(file, filename);
182 }
183 else
184 ftruncate(infd, ftell(infp));
185 }
186 }
187 free(line);
188 fclose(outfp);
189 }
190 remove(file);
191 }
192 fclose(infp);
193 }
194 }
195 }
196 return rc;
197}
|