1 |
#include <stdio.h> |
2 |
#include <errno.h> |
3 |
#include <sys/types.h> |
4 |
#include <regex.h> |
5 |
#include <string.h> |
6 |
#include <stdlib.h> |
7 |
#include <limits.h> |
8 |
|
9 |
#include "config.h" |
10 |
#include "imapfilter.h" |
11 |
#include "file.h" |
12 |
#include "log.h" |
13 |
|
14 |
|
15 |
extern char logfile[PATH_MAX]; |
16 |
|
17 |
account_t *accounts = NULL; /* All accounts. */ |
18 |
|
19 |
filter_t *dfilters; /* Filters of DENY type. */ |
20 |
filter_t *afilters; /* Filters of ALLOW type. */ |
21 |
|
22 |
unsigned int dlimit = 0; |
23 |
unsigned int alimit = 0; /* DENY and ALLOW message size limits. */ |
24 |
|
25 |
|
26 |
/* |
27 |
* Finds path to configuration file, opens it and calls parse_config(). |
28 |
*/ |
29 |
int read_config(char *cfg) |
30 |
{ |
31 |
int r; |
32 |
FILE *fp; |
33 |
char *home = NULL; |
34 |
|
35 |
if (!cfg) { |
36 |
cfg = (char *) malloc(PATH_MAX * sizeof(char)); |
37 |
|
38 |
|
39 |
home = getenv("HOME"); |
40 |
|
41 |
snprintf(cfg, PATH_MAX, "%s/%s", home, ".imapfilterrc"); |
42 |
} |
43 |
#ifdef DEBUG |
44 |
printf("debug: configuration file: %s\n", cfg); |
45 |
#endif |
46 |
|
47 |
fp = fopen(cfg, "r"); |
48 |
|
49 |
if (!fp) { |
50 |
fprintf(stderr, "imapfilter: opening config file %s; %s\n", |
51 |
cfg, strerror(errno)); |
52 |
return 1; |
53 |
} |
54 |
|
55 |
r = parse_config(fp); |
56 |
|
57 |
fclose(fp); |
58 |
|
59 |
return r; |
60 |
} |
61 |
|
62 |
|
63 |
/* |
64 |
* Parses configuration file. |
65 |
*/ |
66 |
int parse_config(FILE * fp) |
67 |
{ |
68 |
int i; |
69 |
unsigned int row = 0; |
70 |
char line[LINE_MAX]; |
71 |
regex_t creg[5]; |
72 |
regmatch_t match[4]; |
73 |
const char *reg[5] = { |
74 |
"^[[:blank:]]*(SERVER|PORT|USERNAME|PASSWORD|LOGFILE)[[:blank:]]*=[[:blank:]]*([[:graph:]]*)[[:blank:]]*", |
75 |
"^[[:blank:]]*(DENY|ALLOW)[[:blank:]]*=[[:blank:]]*(FROM|CC|BCC|SUBJECT|TO):? ([[:print:]]*)", |
76 |
"^[[:blank:]]*(DENY|ALLOW)[[:blank:]]*=[[:blank:]]*([[:graph:]]+):? ([[:print:]]*)", |
77 |
"^[[:blank:]]*(DENY_LIMIT|ALLOW_LIMIT)[[:blank:]]*=[[:blank:]]*([[:digit:]]*)[[:blank:]]*", |
78 |
"^[[:blank:]]*#{0,1}.*" |
79 |
}; |
80 |
|
81 |
for (i = 0; i < 5; i++) |
82 |
regcomp(&creg[i], reg[i], REG_EXTENDED); |
83 |
|
84 |
while (fgets(line, LINE_MAX - 1, fp)) { |
85 |
row++; |
86 |
if (!regexec(&creg[0], line, 3, match, 0)) { |
87 |
set_account(line, match); |
88 |
continue; |
89 |
} else if (!regexec(&creg[1], line, 4, match, 0)) { |
90 |
standard_filter(line, match); |
91 |
continue; |
92 |
} else if (!regexec(&creg[2], line, 4, match, 0)) { |
93 |
custom_filter(line, match); |
94 |
continue; |
95 |
} else if (!regexec(&creg[3], line, 3, match, 0)) { |
96 |
set_limits(line, match); |
97 |
continue; |
98 |
} else if (!regexec(&creg[4], line, 1, match, 0)) |
99 |
continue; |
100 |
else { |
101 |
fprintf(stderr, |
102 |
"imapfilter: parse error in config file at row %d\n", |
103 |
row); |
104 |
return 1; |
105 |
} |
106 |
} |
107 |
|
108 |
/* Fail if no accounts were defined. */ |
109 |
if (!accounts) { |
110 |
fprintf(stderr, |
111 |
"imapfilter: no accounts defined in config file\n"); |
112 |
return 1; |
113 |
} |
114 |
|
115 |
/* Fail if no filters were defined. */ |
116 |
if (!dfilters && !afilters) { |
117 |
fprintf(stderr, "imapfilter: no filters defined in config file\n"); |
118 |
return 1; |
119 |
} |
120 |
|
121 |
return 0; |
122 |
} |
123 |
|
124 |
|
125 |
/* |
126 |
* Allocate memory for accounts, build linked list, and NULL terminate |
127 |
* account settings. |
128 |
*/ |
129 |
account_t *prepare_account(void) |
130 |
{ |
131 |
static account_t *ca; /* Current account. */ |
132 |
|
133 |
if (!accounts) { |
134 |
accounts = (account_t *) malloc(sizeof(account_t)); |
135 |
ca = accounts; |
136 |
} else { |
137 |
ca->next = (account_t *) malloc(sizeof(account_t)); |
138 |
ca = ca->next; |
139 |
} |
140 |
|
141 |
ca->next = NULL; |
142 |
|
143 |
ca->server[0] = 0; |
144 |
ca->port = 143; |
145 |
ca->userid[0] = 0; |
146 |
ca->passwd[0] = 0; |
147 |
|
148 |
return ca; |
149 |
} |
150 |
|
151 |
|
152 |
/* |
153 |
* An account setting was found from parse_config(), changes the |
154 |
* apropriate variable. |
155 |
*/ |
156 |
void set_account(char *line, regmatch_t * match) |
157 |
{ |
158 |
int s; |
159 |
char p[6]; |
160 |
static account_t *ca; |
161 |
|
162 |
if (!strncmp(line + match[1].rm_so, "SERVER", 6)) { |
163 |
ca = prepare_account(); |
164 |
s = min((match[2].rm_eo - match[2].rm_so), SERVER_MAX - 1); |
165 |
strncpy(ca->server, line + match[2].rm_so, s); |
166 |
ca->server[s] = 0; |
167 |
#ifdef DEBUG |
168 |
printf("debug: account setting SERVER: '%s'\n", ca->server); |
169 |
#endif |
170 |
} else if (accounts) { |
171 |
if (!strncmp(line + match[1].rm_so, "PORT", 4)) { |
172 |
s = min((match[2].rm_eo - match[2].rm_so), sizeof(p)); |
173 |
strncpy(p, line + match[2].rm_so, s); |
174 |
p[s] = 0; |
175 |
ca->port = strtoul(p, NULL, 0); |
176 |
#ifdef DEBUG |
177 |
printf("debug: account setting PORT: '%d'\n", ca->port); |
178 |
#endif |
179 |
} else if (!strncmp(line + match[1].rm_so, "USERNAME", 8)) { |
180 |
s = min((match[2].rm_eo - match[2].rm_so), USERID_MAX - 1); |
181 |
strncpy(ca->userid, line + match[2].rm_so, s); |
182 |
ca->userid[s] = 0; |
183 |
#ifdef DEBUG |
184 |
printf("debug: account setting USERNAME: '%s'\n", ca->userid); |
185 |
#endif |
186 |
} else if (!strncmp(line + match[1].rm_so, "PASSWORD", 8)) { |
187 |
s = min((match[2].rm_eo - match[2].rm_so), PASSWD_MAX - 1); |
188 |
strncpy(ca->passwd, line + match[2].rm_so, s); |
189 |
ca->passwd[s] = 0; |
190 |
#ifdef DEBUG |
191 |
printf("debug: account setting PASSWORD: '%s'\n", ca->passwd); |
192 |
#endif |
193 |
} else if (!strncmp(line + match[1].rm_so, "LOGFILE", 7)) { |
194 |
s = min((match[2].rm_eo - match[2].rm_so), PATH_MAX - 1); |
195 |
strncpy(logfile, line + match[2].rm_so, s); |
196 |
logfile[s] = 0; |
197 |
} |
198 |
} |
199 |
} |
200 |
|
201 |
|
202 |
/* |
203 |
* A filter entry was found from parse_config() processes it and saves it. |
204 |
*/ |
205 |
void set_filters(char *line, regmatch_t * match, int csm) |
206 |
{ |
207 |
int s; |
208 |
static filter_t *cdf, *caf; |
209 |
filter_t **cf; |
210 |
filter_t **fl; |
211 |
|
212 |
if (!(strncmp(line + match[1].rm_so, "DENY", 4))) { |
213 |
#ifdef DEBUG |
214 |
printf("debug: filter entry: DENY"); |
215 |
#endif |
216 |
cf = &cdf; |
217 |
fl = &dfilters; |
218 |
} else { |
219 |
#ifdef DEBUG |
220 |
printf("debug: filter entry: ALLOW"); |
221 |
#endif |
222 |
cf = &caf; |
223 |
fl = &afilters; |
224 |
} |
225 |
|
226 |
/* |
227 |
* Allocate memory for filter entry and build linked list. |
228 |
*/ |
229 |
|
230 |
if (!(*fl)) { |
231 |
*fl = (filter_t *) malloc(sizeof(filter_t)); |
232 |
*cf = *fl; |
233 |
} else { |
234 |
(*cf)->next = (filter_t *) malloc(sizeof(filter_t)); |
235 |
*cf = (*cf)->next; |
236 |
} |
237 |
|
238 |
(*cf)->next = NULL; |
239 |
|
240 |
(*cf)->custom = csm; |
241 |
|
242 |
s = min((match[2].rm_eo - match[2].rm_so), FIELD_NAME_MAX - 1); |
243 |
strncpy((*cf)->name, line + match[2].rm_so, s); |
244 |
(*cf)->name[s] = 0; |
245 |
|
246 |
s = min((match[3].rm_eo - match[3].rm_so), FIELD_BODY_MAX - 1); |
247 |
strncpy((*cf)->body, line + match[3].rm_so, s); |
248 |
(*cf)->body[s] = 0; |
249 |
|
250 |
#ifdef DEBUG |
251 |
printf(" '%s': '%s'\n", (*cf)->name, (*cf)->body); |
252 |
#endif |
253 |
} |
254 |
|
255 |
|
256 |
/* |
257 |
* Sets the DENY and ALLOW limits from the values found in config file. |
258 |
*/ |
259 |
void set_limits(char *line, regmatch_t * match) |
260 |
{ |
261 |
int s; |
262 |
char lim[10]; |
263 |
|
264 |
s = min((match[2].rm_eo - match[2].rm_so), sizeof(lim)); |
265 |
strncpy(lim, line + match[2].rm_so, s); |
266 |
lim[s] = 0; |
267 |
|
268 |
if (!strncmp(line + match[1].rm_so, "DENY_LIMIT", 10)) { |
269 |
dlimit = strtoul(lim, NULL, 0); |
270 |
} else { |
271 |
alimit = strtoul(lim, NULL, 0); |
272 |
} |
273 |
} |