aboutsummaryrefslogtreecommitdiff
path: root/lib/env.c
blob: 1c36e19a305ae1d88fe91c6b1c6da3e87a7a1845 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
/* This file is part of pam-modules.
   Copyright (C) 2008, 2010-2012, 2014-2015 Sergey Poznyakoff
 
   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 3 of the License, or (at your
   option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License along
   with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <graypam.h>

char *
gray_env_get(struct gray_env *env, const char *name)
{
	for (; env; env = env->next)
		if (strcmp(env->name, name) == 0)
			return env->value;
	return NULL;
}

int
gray_env_get_bool(struct gray_env *env, const char *name, int dfl)
{
	char *p = gray_env_get(env, name);
	if (!p)
		return dfl;
	return gray_boolean_true_p(p);	
}

void
gray_env_free(struct gray_env *env)
{
	while (env) {
		struct gray_env *next = env->next;
		free(env->name);
		free(env);
		env = next;
	}
}

static void
tr(char *input, char **map)
{
	unsigned char *s = (unsigned char*) input;

	for (; *s; s++) {
		unsigned char *f = (unsigned char *)map[0];
		unsigned char *t = (unsigned char *)map[1];
		for (; *f && *t; f++, t++) {
			if (f > (unsigned char *)map[0]
			    && *f == '-' && *t == '-'
			    && f[1] && t[1]) {
				int a = f[-1];
				int d = f[1] - a;

				if ((d > 0
				     && a < *s && *s <= a + d)
				    || (d < 0
					&& (a + d <= *s && *s < a))) {
					*s = t[-1] + *s - a;
					break;
				}
				++f; ++t;
			} else if (*f == *s) {
				*s = *t;
				break;
			}
		}
	}
}

int
gray_env_read_tr(const char *file_name, struct gray_env **penv, char **trmap)
{
	FILE *fp;
	char *p;
	int rc = 0;
	int line = 0;
	char buf[128];
	gray_slist_t slist = NULL;
	struct gray_env *config_env = NULL;
		
	fp = fopen(file_name, "r");
	if (!fp) {
		_pam_log(LOG_ERR, "cannot open configuration file `%s': %s",
			 file_name, strerror (errno));
		return 1;
	}

	while (p = fgets(buf, sizeof buf, fp)) {
		int len;
		struct gray_env *env;
		
		line++;
		while (*p && isspace(*p))
			p++;
		len = strlen(p);
		if (len == 0)
			continue;
		if (p[len-1] != '\n') {
			if (!slist)
				slist = gray_slist_create();
			gray_slist_append(slist, p, len);
			while (p = fgets(buf, sizeof buf, fp)) {
				len = strlen(p);
				gray_slist_append(slist, p, len);
				if (p[len - 1] == '\n')
					break;
			} 
			gray_slist_append_char(slist, 0);
			p = gray_slist_finish(slist);
			len = strlen(p);
		}

		p[len-1] = 0;
		len = gray_trim_ws(p);
			
		if (*p == 0 || *p == '#')
			continue;

		if (p[len-1] == '\\') {
			int err = 0;
			
			/* Collect continuation lines */
			if (!slist)
				slist = gray_slist_create();
			do {
				gray_slist_append(slist, p, len - 1);
				p = fgets (buf, sizeof buf, fp);
				if (!p)
					break;
				line++;
				len = strlen(p);
				if (len == 0)
					break;
				if (p[len-1] != '\n') {
					_pam_log(LOG_EMERG,
						 "%s:%d: string too long",
						 file_name, line);
					err = 1; 
					break;
				}
				p[len-1] = 0;
				len = gray_trim_ws(p);
			} while (p[len-1] == '\\');
			if (len)
				gray_slist_append(slist, p, len);
			gray_slist_append_char(slist, 0);
			p = gray_slist_finish(slist);
			if (err)
				continue;
		}
		
		env = malloc(sizeof *env);
		if (!env) {
			_pam_log(LOG_EMERG, "not enough memory");
			rc = 1;
			break;
		}

		env->name = strdup(p);
		if (!env->name) {
			_pam_log(LOG_EMERG, "not enough memory");
			free(env);
			rc = 1;
			break;
		}

		for (p = env->name; *p && !isspace(*p); p++) 
			;
		if (*p)
			*p++ = 0;
		if (trmap)
			tr(env->name, trmap);
		for (; *p && isspace(*p); p++)
			;
		if (!*p) {
			_pam_log(LOG_EMERG, "%s:%d: not enough fields",
				 file_name, line);
			free(env->name);
			free(env);
			continue;
		}
		env->value = p;
		env->next = config_env;
		config_env = env;
	}

	gray_slist_free(&slist);
	fclose(fp);
	*penv = config_env;
	return rc;
}

int
gray_env_read(const char *file_name, struct gray_env **penv)
{
	return gray_env_read_tr(file_name, penv, NULL);
}

void
gray_env_merge(struct gray_env **pa, struct gray_env **pb)
{
	if (!*pa)
		*pa = *pb;
	else if (!*pb)
		return;
	else {
		struct gray_env *a;
		for (a = *pa; a->next; a = a->next)
			;
		a->next = *pb;
	}
	*pb = NULL;
}

int
gray_boolean_true_p(const char *value)
{
	return strcmp(value, "yes") == 0
		|| strcmp(value, "true") == 0
		|| strcmp(value, "t") == 0;
}

Return to:

Send suggestions and report system problems to the System administrator.