5 Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
7 Copyright (C) 1997 - 2000 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
21 * These are general utility functions that doesn't belong to any specific
26 #include "silcincludes.h"
28 /* Reads a file to a buffer. The allocated buffer is returned. Length of
29 the file read is returned to the return_len argument. */
31 char *silc_file_read(const char *filename, uint32 *return_len)
37 fd = open(filename, O_RDONLY);
39 SILC_LOG_ERROR(("Cannot open file %s: %s", filename, strerror(errno)));
43 filelen = lseek(fd, (off_t)0L, SEEK_END);
46 if (lseek(fd, (off_t)0L, SEEK_SET) < 0)
50 SILC_LOG_ERROR(("Cannot open file %s: %s", filename, strerror(errno)));
54 buffer = silc_calloc(filelen + 1, sizeof(char));
56 if ((read(fd, buffer, filelen)) == -1) {
57 memset(buffer, 0, sizeof(buffer));
59 SILC_LOG_ERROR(("Cannot read from file %s: %s", filename,
65 buffer[filelen] = EOF;
68 *return_len = filelen;
73 /* Writes a buffer to the file. */
75 int silc_file_write(const char *filename, const char *buffer, uint32 len)
79 if ((fd = creat(filename, 0644)) == -1) {
80 SILC_LOG_ERROR(("Cannot open file %s for writing: %s", filename,
85 if ((write(fd, buffer, len)) == -1) {
86 SILC_LOG_ERROR(("Cannot write to file %s: %s", filename, strerror(errno)));
95 /* Writes a buffer to the file. If the file is created specific mode is
98 int silc_file_write_mode(const char *filename, const char *buffer,
103 if ((fd = creat(filename, mode)) == -1) {
104 SILC_LOG_ERROR(("Cannot open file %s for writing: %s", filename,
109 if ((write(fd, buffer, len)) == -1) {
110 SILC_LOG_ERROR(("Cannot write to file %s: %s", filename, strerror(errno)));
119 /* Gets line from a buffer. Stops reading when a newline or EOF occurs.
120 This doesn't remove the newline sign from the destination buffer. The
121 argument begin is returned and should be passed again for the function. */
123 int silc_gets(char *dest, int destlen, const char *src, int srclen, int begin)
125 static int start = 0;
128 memset(dest, 0, destlen);
134 for ( ; start <= srclen; i++, start++) {
138 dest[i] = src[start];
151 /* Checks line for illegal characters. Return -1 when illegal character
152 were found. This is used to check for bad lines when reading data from
153 for example a configuration file. */
155 int silc_check_line(char *buf)
157 /* Illegal characters in line */
158 if (strchr(buf, '#')) return -1;
159 if (strchr(buf, '\'')) return -1;
160 if (strchr(buf, '\\')) return -1;
161 if (strchr(buf, '\r')) return -1;
162 if (strchr(buf, '\a')) return -1;
163 if (strchr(buf, '\b')) return -1;
164 if (strchr(buf, '\f')) return -1;
173 /* Returns current time as string. */
175 char *silc_get_time()
180 curtime = time(NULL);
181 return_time = ctime(&curtime);
182 return_time[strlen(return_time) - 1] = '\0';
187 /* Converts string to capital characters */
189 char *silc_to_upper(char *string)
192 char *ret = silc_calloc(strlen(string) + 1, sizeof(char));
194 for (i = 0; i < strlen(string); i++)
195 ret[i] = toupper(string[i]);
200 static unsigned char pem_enc[64] =
201 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
203 /* Encodes data into PEM encoding. Returns NULL terminated PEM encoded
204 data string. Note: This is originally public domain code and is
207 char *silc_encode_pem(unsigned char *data, uint32 len)
210 uint32 bits, c, char_count;
217 pem = silc_calloc(((len * 8 + 5) / 6) + 5, sizeof(*pem));
219 for (i = 0; i < len; i++) {
224 if (char_count == 3) {
225 pem[j++] = pem_enc[bits >> 18];
226 pem[j++] = pem_enc[(bits >> 12) & 0x3f];
227 pem[j++] = pem_enc[(bits >> 6) & 0x3f];
228 pem[j++] = pem_enc[bits & 0x3f];
236 if (char_count != 0) {
237 bits <<= 16 - (8 * char_count);
238 pem[j++] = pem_enc[bits >> 18];
239 pem[j++] = pem_enc[(bits >> 12) & 0x3f];
241 if (char_count == 1) {
245 pem[j++] = pem_enc[(bits >> 6) & 0x3f];
253 /* Same as above but puts newline ('\n') every 72 characters. */
255 char *silc_encode_pem_file(unsigned char *data, uint32 data_len)
261 pem = silc_encode_pem(data, data_len);
264 pem2 = silc_calloc(len + (len / 72) + 1, sizeof(*pem2));
266 for (i = 0, j = 0, cols = 1; i < len; i++, cols++) {
280 /* Decodes PEM into data. Returns the decoded data. Note: This is
281 originally public domain code and is still PD. */
283 unsigned char *silc_decode_pem(unsigned char *pem, uint32 pem_len,
287 uint32 len, c, char_count, bits;
289 static char ialpha[256], decoder[256];
291 for (i = 64 - 1; i >= 0; i--) {
292 ialpha[pem_enc[i]] = 1;
293 decoder[pem_enc[i]] = i;
305 data = silc_calloc(((len * 6) / 8), sizeof(*data));
307 for (i = 0; i < len; i++) {
313 if (c > 127 || !ialpha[c])
319 if (char_count == 4) {
320 data[j++] = bits >> 16;
321 data[j++] = (bits >> 8) & 0xff;
322 data[j++] = bits & 0xff;
336 data[j++] = bits >> 10;
339 data[j++] = bits >> 16;
340 data[j++] = (bits >> 8) & 0xff;
350 /* Parse nickname string. The format may be <num>!<nickname>@<server> to
351 support multiple same nicknames. The <num> is the final unifier if same
352 nickname is on same server. Note, this is only local format and server
353 does not know anything about these. */
355 int silc_parse_nickname(char *string, char **nickname, char **server,
364 if (strchr(string, '!')) {
365 tlen = strcspn(string, "!");
366 memset(tmp, 0, sizeof(tmp));
367 memcpy(tmp, string, tlen);
372 if (tlen >= strlen(string))
378 if (strchr(string, '@')) {
379 tlen = strcspn(string, "@");
382 *nickname = silc_calloc(tlen + 1, sizeof(char));
383 memcpy(*nickname, string, tlen);
387 *server = silc_calloc((strlen(string) - tlen) + 1, sizeof(char));
388 memcpy(*server, string + tlen + 1, strlen(string) - tlen - 1);
392 *nickname = strdup(string);
398 /* Parses command line. At most `max_args' is taken. Rest of the line
399 will be allocated as the last argument if there are more than `max_args'
400 arguments in the line. Note that the command name is counted as one
401 argument and is saved. */
403 void silc_parse_command_line(unsigned char *buffer,
404 unsigned char ***parsed,
405 uint32 **parsed_lens,
406 uint32 **parsed_types,
412 const char *cp = buffer;
414 *parsed = silc_calloc(1, sizeof(**parsed));
415 *parsed_lens = silc_calloc(1, sizeof(**parsed_lens));
417 /* Get the command first */
418 len = strcspn(cp, " ");
419 (*parsed)[0] = silc_to_upper((char *)cp);
420 (*parsed_lens)[0] = len;
424 /* Parse arguments */
425 if (strchr(cp, ' ') || strlen(cp) != 0) {
426 for (i = 1; i < max_args; i++) {
428 if (i != max_args - 1)
429 len = strcspn(cp, " ");
433 *parsed = silc_realloc(*parsed, sizeof(**parsed) * (argc + 1));
434 *parsed_lens = silc_realloc(*parsed_lens,
435 sizeof(**parsed_lens) * (argc + 1));
436 (*parsed)[argc] = silc_calloc(len + 1, sizeof(char));
437 memcpy((*parsed)[argc], cp, len);
438 (*parsed_lens)[argc] = len;
449 /* Save argument types. Protocol defines all argument types but
450 this implementation makes sure that they are always in correct
451 order hence this simple code. */
452 *parsed_types = silc_calloc(argc, sizeof(**parsed_types));
453 for (i = 0; i < argc; i++)
454 (*parsed_types)[i] = i;
459 /* Formats arguments to a string and returns it after allocating memory
460 for it. It must be remembered to free it later. */
462 char *silc_format(char *fmt, ...)
465 static char buf[8192];
467 memset(buf, 0, sizeof(buf));
469 vsnprintf(buf, sizeof(buf) - 1, fmt, args);
475 /* Renders ID to suitable to print for example to log file. */
477 static char rid[256];
479 char *silc_id_render(void *id, uint16 type)
482 unsigned char tmps[2];
484 memset(rid, 0, sizeof(rid));
488 SilcServerID *server_id = (SilcServerID *)id;
489 strcat(rid, inet_ntoa(server_id->ip));
490 memset(tmp, 0, sizeof(tmp));
491 snprintf(tmp, sizeof(tmp), ",%d,", ntohs(server_id->port));
493 SILC_PUT16_MSB(server_id->rnd, tmps);
494 memset(tmp, 0, sizeof(tmp));
495 snprintf(tmp, sizeof(tmp), "[%02x %02x]", tmps[0], tmps[1]);
501 SilcClientID *client_id = (SilcClientID *)id;
502 strcat(rid, inet_ntoa(client_id->ip));
503 memset(tmp, 0, sizeof(tmp));
504 snprintf(tmp, sizeof(tmp), ",%02x,", client_id->rnd);
506 memset(tmp, 0, sizeof(tmp));
507 snprintf(tmp, sizeof(tmp), "[%02x %02x %02x %02x...]",
508 client_id->hash[0], client_id->hash[1],
509 client_id->hash[2], client_id->hash[3]);
513 case SILC_ID_CHANNEL:
515 SilcChannelID *channel_id = (SilcChannelID *)id;
516 strcat(rid, inet_ntoa(channel_id->ip));
517 memset(tmp, 0, sizeof(tmp));
518 snprintf(tmp, sizeof(tmp), ",%d,", ntohs(channel_id->port));
520 SILC_PUT16_MSB(channel_id->rnd, tmps);
521 memset(tmp, 0, sizeof(tmp));
522 snprintf(tmp, sizeof(tmp), "[%02x %02x]", tmps[0], tmps[1]);
531 /* Compares two strings. Strings may include wildcards * and ?.
532 Returns TRUE if strings match. */
534 int silc_string_compare(char *string1, char *string2)
537 int slen1 = strlen(string1);
538 int slen2 = strlen(string2);
539 char *tmpstr1, *tmpstr2;
541 if (!string1 || !string2)
544 /* See if they are same already */
545 if (!strncmp(string1, string2, strlen(string2)))
549 if (!strchr(string1, '*'))
552 /* Take copies of the original strings as we will change them */
553 tmpstr1 = silc_calloc(slen1 + 1, sizeof(char));
554 memcpy(tmpstr1, string1, slen1);
555 tmpstr2 = silc_calloc(slen2 + 1, sizeof(char));
556 memcpy(tmpstr2, string2, slen2);
558 for (i = 0; i < slen2; i++) {
560 /* * wildcard. Only one * wildcard is possible. */
561 if (tmpstr1[i] == '*')
562 if (!strncmp(tmpstr1, tmpstr2, i)) {
563 memset(tmpstr2, 0, slen2);
564 strncpy(tmpstr2, tmpstr1, i);
569 if (tmpstr1[i] == '?') {
570 if (!strncmp(tmpstr1, tmpstr2, i)) {
571 if (!(slen1 < i + 1))
572 if (tmpstr1[i + 1] != '?' &&
573 tmpstr1[i + 1] != tmpstr2[i + 1])
576 if (!(slen1 < slen2))
581 if (strncmp(tmpstr1, tmpstr2, i))
582 strncpy(tmpstr2, string2, slen2);
587 /* if using *, remove it */
588 if (strchr(tmpstr1, '*'))
589 *strchr(tmpstr1, '*') = 0;
591 if (!strcmp(tmpstr1, tmpstr2)) {
592 memset(tmpstr1, 0, slen1);
593 memset(tmpstr2, 0, slen2);
599 memset(tmpstr1, 0, slen1);
600 memset(tmpstr2, 0, slen2);
606 /* Inspects the `string' for wildcards and returns regex string that can
607 be used by the GNU regex library. A comma (`,') in the `string' means
608 that the string is list. */
610 char *silc_string_regexify(const char *string)
615 len = strlen(string);
617 for (i = 0; i < len; i++)
618 if (string[i] == '*' || string[i] == '?')
621 regex = silc_calloc(len + count, sizeof(*regex));
627 for (i = 0; i < len; i++) {
628 if (string[i] == '*' || string[i] == '?') {
631 } else if (string[i] == ',') {
637 regex[count] = string[i];
641 regex[count - 1] = ')';
647 /* Combines two regex strings into one regex string so that they can be
648 used as one by the GNU regex library. The `string2' is combine into
651 char *silc_string_regex_combine(const char *string1, const char *string2)
656 len1 = strlen(string1);
657 len2 = strlen(string2);
659 tmp = silc_calloc(2 + len1 + len2, sizeof(*tmp));
660 strncat(tmp, string1, len1 - 2);
661 strncat(tmp, "|", 1);
662 strncat(tmp, string2 + 1, len2 - 1);
667 /* Matches the two strings and returns TRUE if the strings match. */
669 int silc_string_regex_match(const char *regex, const char *string)
674 if (regcomp(&preg, regex, REG_NOSUB | REG_EXTENDED) < 0)
677 if (regexec(&preg, string, 0, NULL, 0) == 0)
685 /* Do regex match to the two strings `string1' and `string2'. If the
686 `string2' matches the `string1' this returns TRUE. */
688 int silc_string_match(const char *string1, const char *string2)
693 s1 = silc_string_regexify(string1);
694 ret = silc_string_regex_match(s1, string2);
700 /* Returns the username of the user. If the global variable LOGNAME
701 does not exists we will get the name from the password file. */
703 char *silc_get_username()
705 char *logname = NULL;
707 logname = strdup(getenv("LOGNAME"));
709 logname = getlogin();
713 pw = getpwuid(getuid());
715 fprintf(stderr, "silc_get_username: %s\n", strerror(errno));
719 logname = strdup(pw->pw_name);
726 /* Returns the real name of ther user. */
728 char *silc_get_real_name()
730 char *realname = NULL;
733 pw = getpwuid(getuid());
735 fprintf(stderr, "silc_get_username: %s\n", strerror(errno));
739 if (strchr(pw->pw_gecos, ','))
740 *strchr(pw->pw_gecos, ',') = 0;
742 realname = strdup(pw->pw_gecos);