imapfilter/imapfilter/file.c

#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <regex.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/stat.h>

#include "config.h"
#include "imapfilter.h"
#include "data.h"


extern char logfile[PATH_MAX];
extern unsigned int options;


/*
 * Find the path to configuration file, open it and call parse_config().
 */
int read_config(char *cfg)
{
    int r;
    FILE *fp;
    char *home = NULL;

    if (!cfg) {
        cfg = (char *) malloc(PATH_MAX * sizeof(char));


        home = getenv("HOME");

        snprintf(cfg, PATH_MAX, "%s/%s", home, ".imapfilterrc");
    }
#ifdef DEBUG
    printf("debug: configuration file: '%s'\n", cfg);
#endif
#ifdef CHECK_PERMISSIONS
    check_permissions(cfg);
#endif
    fp = fopen(cfg, "r");

    if (!fp)
        fatal(ERROR_FILE_OPEN, "imapfilter: opening config file %s; %s\n",
              cfg, strerror(errno));

    if ((r = parse_config(fp)))
        fatal(ERROR_CONFIG_PARSE,
              "imapfilter: parse error in config file at row %d\n", r);

    fclose(fp);

#ifdef DEBUG
    printf("debug: options: %0#10x\n", options);
#endif

    return 0;
}


#ifdef CHECK_PERMISSIONS
/*
 * Check the permissions of the configuration file.
 */
int check_permissions(char *cfg)
{
    struct stat fs;

    if (stat(cfg, &fs)) {
        error("imapfilter: getting file %s status; %s\n", cfg,
              strerror(errno));
        return ERROR_TRIVIAL;
    }

    if (!S_ISREG(fs.st_mode)) {
        error("imapfilter: file %s not a regular file\n", cfg);
        return ERROR_TRIVIAL;
    }

    if ((fs.st_mode & 00777) != (S_IRUSR | S_IWUSR)) {
        error("imapfilter: warning: improper config file %s permissions\n"
              "imapfilter: warning: file's mode should be 600 not %o\n",
              cfg, fs.st_mode & 00777);
        return ERROR_TRIVIAL;
    }

    return 0;
}
#endif

/*
 * Parse configuration file.
 */
int parse_config(FILE * fp)
{
    int i, r = 0;
    unsigned int row = 0;
    char line[LINE_MAX];
    regex_t creg[11];
    regmatch_t match[7];
    const char *reg[11] = {
        "^([[:blank:]]*\n|#.*\n)$",
        "^[[:blank:]]*ACCOUNT[[:blank:]]+([[:graph:]]*):([[:graph:]]*)@([[:alnum:].-]+)(:[[:digit:]]{1,5})?[[:blank:]]*\n$",
        "^[[:blank:]]*FOLDER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+([[:graph:]]+)[[:blank:]]*\n$",
        "^[[:blank:]]*FILTER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]*([[:blank:]]OR|[[:blank:]]AND)?[[:blank:]]*\n$",
        "^[[:blank:]]*ACTION[[:blank:]]+(DELETE|COPY[[:blank:]]+([[:graph:]]+)|MOVE[[:blank:]]+([[:graph:]]+)|LIST)[[:blank:]]*([[:graph:]]*)[[:blank:]]*\n$",
        "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*(ANSWERED|DELETED|DRAFT|FLAGGED|NEW|OLD|RECENT|SEEN|UNANSWERED|UNDELETED|UNDRAFT|UNFLAGGED|UNSEEN)[[:blank:]]*\n$",
        "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*(BCC|BODY|CC|FROM|SUBJECT|TEXT|TO)[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)[[:blank:]]*\n$",
        "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*(HEADER)[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)[[:blank:]]*\n$",
        "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*(LARGER|SMALLER)[[:blank:]]+([[:digit:]]+)[[:blank:]]*\n$",
        "^[[:blank:]]*JOB[[:blank:]]+([[:alnum:],_-]+)[[:blank:]]+([[:alnum:],_-]+)[[:blank:]]*\n$",
        "^[[:blank:]]*LOGFILE[[:blank:]]*=[[:blank:]]*([[:print:]]+)\n$"
    };

    for (i = 0; i < 11; i++)
        regcomp(&creg[i], reg[i], REG_EXTENDED | REG_ICASE);

    while (fgets(line, LINE_MAX - 1, fp)) {
        row++;
        if (!regexec(&creg[0], line, 0, match, 0))
            continue;
        else if (!regexec(&creg[1], line, 6, match, 0))
            set_account(line, match);
        else if (!regexec(&creg[2], line, 3, match, 0))
            r = set_mboxgrp(line, match);
        else if (!regexec(&creg[3], line, 3, match, 0))
            r = set_filter(line, match);
        else if (!regexec(&creg[4], line, 5, match, 0))
            r = set_action(line, match);
        else if (!regexec(&creg[5], line, 7, match, 0) ||
                   !regexec(&creg[6], line, 7, match, 0) ||
                   !regexec(&creg[7], line, 7, match, 0) ||
                   !regexec(&creg[8], line, 7, match, 0))
            r = set_mask(line, match);
        else if (!regexec(&creg[9], line, 3, match, 0))
            r = set_job(line, match);
        else if (!regexec(&creg[10], line, 2, match, 0))
            set_options(line, match);
        else
            return row;
        
        if (r == ERROR_CONFIG_PARSE)
            return row;
    }

    for (i = 0; i < 11; i++)
        regfree(&creg[i]);
    
    destroy_data();

    return 0;
}


/*
 * Set other options found in config file.
 */
void set_options(char *line, regmatch_t * match)
{
    if (!*logfile)
        strncat(logfile, line + match[1].rm_so,
                min((match[1].rm_eo - match[1].rm_so), PATH_MAX - 1));
}
1	lefcha	1.1	#include <stdio.h>
2			#include <errno.h>
3	lefcha	1.5	#include <sys/types.h>
4	lefcha	1.1	#include <regex.h>
5			#include <string.h>
6			#include <stdlib.h>
7			#include <limits.h>
8	lefcha	1.10	#include <sys/stat.h>
9	lefcha	1.1
10			#include "config.h"
11			#include "imapfilter.h"
12	lefcha	1.13	#include "data.h"
13	lefcha	1.1
14
15	lefcha	1.6	extern char logfile[PATH_MAX];
16	lefcha	1.11	extern unsigned int options;
17	lefcha	1.8
18	lefcha	1.1
19			/*
20	lefcha	1.13	* Find the path to configuration file, open it and call parse_config().
21	lefcha	1.1	*/
22			int read_config(char *cfg)
23			{
24			int r;
25			FILE *fp;
26			char *home = NULL;
27
28			if (!cfg) {
29			cfg = (char ) malloc(PATH_MAX sizeof(char));
30
31	lefcha	1.8
32	lefcha	1.1	home = getenv("HOME");
33
34			snprintf(cfg, PATH_MAX, "%s/%s", home, ".imapfilterrc");
35			}
36			#ifdef DEBUG
37	lefcha	1.11	printf("debug: configuration file: '%s'\n", cfg);
38	lefcha	1.1	#endif
39	lefcha	1.13	#ifdef CHECK_PERMISSIONS
40			check_permissions(cfg);
41	lefcha	1.12	#endif
42	lefcha	1.1	fp = fopen(cfg, "r");
43
44	lefcha	1.17	if (!fp)
45			fatal(ERROR_FILE_OPEN, "imapfilter: opening config file %s; %s\n",
46	lefcha	1.11	cfg, strerror(errno));
47	lefcha	1.1
48	lefcha	1.17	if ((r = parse_config(fp)))
49			fatal(ERROR_CONFIG_PARSE,
50			"imapfilter: parse error in config file at row %d\n", r);
51	lefcha	1.1
52			fclose(fp);
53
54	lefcha	1.11	#ifdef DEBUG
55			printf("debug: options: %0#10x\n", options);
56			#endif
57
58	lefcha	1.17	return 0;
59	lefcha	1.1	}
60
61	lefcha	1.6
62	lefcha	1.13	#ifdef CHECK_PERMISSIONS
63	lefcha	1.1	/*
64	lefcha	1.13	* Check the permissions of the configuration file.
65	lefcha	1.10	*/
66	lefcha	1.13	int check_permissions(char *cfg)
67	lefcha	1.10	{
68			struct stat fs;
69
70			if (stat(cfg, &fs)) {
71	lefcha	1.11	error("imapfilter: getting file %s status; %s\n", cfg,
72			strerror(errno));
73	lefcha	1.17	return ERROR_TRIVIAL;
74	lefcha	1.10	}
75
76			if (!S_ISREG(fs.st_mode)) {
77	lefcha	1.11	error("imapfilter: file %s not a regular file\n", cfg);
78	lefcha	1.17	return ERROR_TRIVIAL;
79	lefcha	1.10	}
80
81			if ((fs.st_mode & 00777) != (S_IRUSR \| S_IWUSR)) {
82	lefcha	1.17	error("imapfilter: warning: improper config file %s permissions\n"
83			"imapfilter: warning: file's mode should be 600 not %o\n",
84			cfg, fs.st_mode & 00777);
85			return ERROR_TRIVIAL;
86	lefcha	1.10	}
87
88			return 0;
89			}
90	lefcha	1.12	#endif
91	lefcha	1.10
92			/*
93	lefcha	1.13	* Parse configuration file.
94	lefcha	1.1	*/
95			int parse_config(FILE * fp)
96			{
97	lefcha	1.17	int i, r = 0;
98	lefcha	1.1	unsigned int row = 0;
99			char line[LINE_MAX];
100	lefcha	1.15	regex_t creg[11];
101	lefcha	1.13	regmatch_t match[7];
102	lefcha	1.15	const char *reg[11] = {
103			"^([[:blank:]]\n\|#.\n)$",
104	lefcha	1.17	"^[[:blank:]]ACCOUNT[[:blank:]]+([[:graph:]]):([[:graph:]])@([[:alnum:].-]+)(:[[:digit:]]{1,5})?[[:blank:]]\n$",
105	lefcha	1.13	"^[[:blank:]]FOLDER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+([[:graph:]]+)[[:blank:]]\n$",
106			"^[[:blank:]]FILTER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]([[:blank:]]OR\|[[:blank:]]AND)?[[:blank:]]*\n$",
107	lefcha	1.17	"^[[:blank:]]ACTION[[:blank:]]+(DELETE\|COPY[[:blank:]]+([[:graph:]]+)\|MOVE[[:blank:]]+([[:graph:]]+)\|LIST)[[:blank:]]([[:graph:]])[[:blank:]]\n$",
108			"^[[:blank:]](MASK[[:blank:]])?[[:blank:]](OR[[:blank:]]\|AND[[:blank:]])?[[:blank:]](NOT[[:blank:]])?[[:blank:]](ANSWERED\|DELETED\|DRAFT\|FLAGGED\|NEW\|OLD\|RECENT\|SEEN\|UNANSWERED\|UNDELETED\|UNDRAFT\|UNFLAGGED\|UNSEEN)[[:blank:]]*\n$",
109			"^[[:blank:]](MASK[[:blank:]])?[[:blank:]](OR[[:blank:]]\|AND[[:blank:]])?[[:blank:]](NOT[[:blank:]])?[[:blank:]](BCC\|BODY\|CC\|FROM\|SUBJECT\|TEXT\|TO)[[:blank:]]+(\"[[:print:]]\"\|[[:graph:]]+)[[:blank:]]\n$",
110			"^[[:blank:]](MASK[[:blank:]])?[[:blank:]](OR[[:blank:]]\|AND[[:blank:]])?[[:blank:]](NOT[[:blank:]])?[[:blank:]](HEADER)[[:blank:]]+(\"[[:print:]]\"\|[[:graph:]]+)[[:blank:]]+(\"[[:print:]]\"\|[[:graph:]]+)[[:blank:]]*\n$",
111	lefcha	1.13	"^[[:blank:]](MASK[[:blank:]])?[[:blank:]](OR[[:blank:]]\|AND[[:blank:]])?[[:blank:]](NOT[[:blank:]])?[[:blank:]](LARGER\|SMALLER)[[:blank:]]+([[:digit:]]+)[[:blank:]]*\n$",
112			"^[[:blank:]]JOB[[:blank:]]+([[:alnum:],_-]+)[[:blank:]]+([[:alnum:],_-]+)[[:blank:]]\n$",
113	lefcha	1.16	"^[[:blank:]]LOGFILE[[:blank:]]=[[:blank:]]*([[:print:]]+)\n$"
114	lefcha	1.1	};
115
116	lefcha	1.15	for (i = 0; i < 11; i++)
117	lefcha	1.14	regcomp(&creg[i], reg[i], REG_EXTENDED \| REG_ICASE);
118	lefcha	1.1
119			while (fgets(line, LINE_MAX - 1, fp)) {
120			row++;
121	lefcha	1.15	if (!regexec(&creg[0], line, 0, match, 0))
122			continue;
123			else if (!regexec(&creg[1], line, 6, match, 0))
124	lefcha	1.13	set_account(line, match);
125	lefcha	1.15	else if (!regexec(&creg[2], line, 3, match, 0))
126	lefcha	1.17	r = set_mboxgrp(line, match);
127	lefcha	1.15	else if (!regexec(&creg[3], line, 3, match, 0))
128	lefcha	1.17	r = set_filter(line, match);
129			else if (!regexec(&creg[4], line, 5, match, 0))
130			r = set_action(line, match);
131	lefcha	1.15	else if (!regexec(&creg[5], line, 7, match, 0) \|\|
132	lefcha	1.13	!regexec(&creg[6], line, 7, match, 0) \|\|
133	lefcha	1.15	!regexec(&creg[7], line, 7, match, 0) \|\|
134			!regexec(&creg[8], line, 7, match, 0))
135	lefcha	1.17	r = set_mask(line, match);
136	lefcha	1.15	else if (!regexec(&creg[9], line, 3, match, 0))
137	lefcha	1.17	r = set_job(line, match);
138	lefcha	1.15	else if (!regexec(&creg[10], line, 2, match, 0))
139			set_options(line, match);
140	lefcha	1.17	else
141			return row;
142
143			if (r == ERROR_CONFIG_PARSE)
144			return row;
145	lefcha	1.1	}
146	lefcha	1.3
147	lefcha	1.15	for (i = 0; i < 11; i++)
148	lefcha	1.12	regfree(&creg[i]);
149	lefcha	1.15
150			destroy_data();
151	lefcha	1.6
152	lefcha	1.8	return 0;
153	lefcha	1.1	}
154
155
156			/*
157	lefcha	1.13	* Set other options found in config file.
158	lefcha	1.11	*/
159			void set_options(char line, regmatch_t match)
160			{
161	lefcha	1.17	if (!*logfile)
162			strncat(logfile, line + match[1].rm_so,
163			min((match[1].rm_eo - match[1].rm_so), PATH_MAX - 1));
164	lefcha	1.1	}