5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2008 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; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
20 * These are general utility functions that doesn't belong to any specific
27 /* Gets line from a buffer. Stops reading when a newline or EOF occurs.
28 This doesn't remove the newline sign from the destination buffer. The
29 argument begin is returned and should be passed again for the function. */
31 int silc_gets(char *dest, int destlen, const char *src, int srclen, int begin)
36 memset(dest, 0, destlen);
42 for ( ; start <= srclen; i++, start++) {
44 silc_set_errno(SILC_ERR_OVERFLOW);
51 silc_set_errno(SILC_ERR_EOF);
63 /* Converts string to capital characters. */
65 SilcBool silc_to_upper(const char *string, char *dest, SilcUInt32 dest_size)
69 if (strlen(string) > dest_size) {
70 silc_set_errno(SILC_ERR_OVERFLOW);
74 for (i = 0; i < strlen(string); i++)
75 dest[i] = (char)toupper((int)string[i]);
80 /* Converts string to lower letter characters. */
82 SilcBool silc_to_lower(const char *string, char *dest, SilcUInt32 dest_size)
86 if (strlen(string) > dest_size) {
87 silc_set_errno(SILC_ERR_OVERFLOW);
91 for (i = 0; i < strlen(string); i++)
92 dest[i] = (char)tolower((int)string[i]);
97 /* Parse userfqdn string which is in user@fqdn format. */
99 int silc_parse_userfqdn(const char *string,
100 char *user, SilcUInt32 user_size,
101 char *fqdn, SilcUInt32 fqdn_size)
105 if (!user && !fqdn) {
106 silc_set_errno(SILC_ERR_INVALID_ARGUMENT);
110 memset(user, 0, user_size);
111 memset(fqdn, 0, fqdn_size);
114 silc_set_errno(SILC_ERR_INVALID_ARGUMENT);
118 if (string[0] == '@') {
120 silc_strncat(user, user_size, string, strlen(string));
125 if (strchr(string, '@')) {
126 tlen = strcspn(string, "@");
129 silc_strncat(user, user_size, string, tlen);
132 silc_strncat(fqdn, fqdn_size, string + tlen + 1,
133 strlen(string) - tlen - 1);
139 silc_strncat(user, user_size, string, strlen(string));
144 /* Parses command line. At most `max_args' is taken. Rest of the line
145 will be allocated as the last argument if there are more than `max_args'
146 arguments in the line. Note that the command name is counted as one
147 argument and is saved. */
149 void silc_parse_command_line(unsigned char *buffer,
150 unsigned char ***parsed,
151 SilcUInt32 **parsed_lens,
152 SilcUInt32 **parsed_types,
153 SilcUInt32 *parsed_num,
158 const char *cp = (const char *)buffer;
161 *parsed = silc_calloc(1, sizeof(**parsed));
162 *parsed_lens = silc_calloc(1, sizeof(**parsed_lens));
164 /* Get the command first */
165 len = strcspn(cp, " ");
166 tmp = silc_calloc(strlen(cp) + 1, sizeof(*tmp));
169 silc_to_upper(cp, tmp, strlen(cp));
170 (*parsed)[0] = silc_calloc(len + 1, sizeof(char));
171 memcpy((*parsed)[0], tmp, len);
173 (*parsed_lens)[0] = len;
179 /* Parse arguments */
180 if (strchr(cp, ' ') || strlen(cp) != 0) {
181 for (i = 1; i < max_args; i++) {
183 if (i != max_args - 1)
184 len = strcspn(cp, " ");
187 while (len && cp[len - 1] == ' ')
192 *parsed = silc_realloc(*parsed, sizeof(**parsed) * (argc + 1));
193 *parsed_lens = silc_realloc(*parsed_lens,
194 sizeof(**parsed_lens) * (argc + 1));
195 (*parsed)[argc] = silc_calloc(len + 1, sizeof(char));
196 memcpy((*parsed)[argc], cp, len);
197 (*parsed_lens)[argc] = len;
209 /* Save argument types. Protocol defines all argument types but
210 this implementation makes sure that they are always in correct
211 order hence this simple code. */
212 *parsed_types = silc_calloc(argc, sizeof(**parsed_types));
213 for (i = 0; i < argc; i++)
214 (*parsed_types)[i] = i;
219 /* Formats arguments to a string and returns it after allocating memory
220 for it. It must be remembered to free it later. */
222 char *silc_format(char *fmt, ...)
228 silc_vsnprintf(buf, sizeof(buf), fmt, args);
231 return silc_strdup(buf);
234 /* Creates fingerprint from data, usually used with SHA1 digests */
236 char *silc_fingerprint(const unsigned char *data, SilcUInt32 data_len)
238 unsigned char *fingerprint, *cp;
239 unsigned int len, blocks, i;
241 if (!data || !data_len) {
242 silc_set_errno(SILC_ERR_INVALID_ARGUMENT);
249 /* Align and calculate total length */
250 len = ((data_len + 19) / 20) * 20;
252 len = (len * 2) + ((blocks - 1) * 2) + (4 * blocks) + 2 + 1;
254 cp = fingerprint = silc_calloc(len, sizeof(*fingerprint));
258 for (i = 0; i < data_len; i++) {
259 silc_snprintf(cp, len, "%02X", data[i]);
263 if ((i + 1) % 2 == 0)
264 silc_snprintf(cp++, len--, " ");
265 if ((i + 1) % 10 == 0)
266 silc_snprintf(cp++, len--, " ");
269 if ((i + 1) % 10 == 0)
271 if ((i + 1) % 2 == 0)
277 /* Return TRUE if the `data' is ASCII string. */
279 SilcBool silc_string_is_ascii(const unsigned char *data, SilcUInt32 data_len)
283 for (i = 0; i < data_len; i++) {
284 if (!isascii(data[i]))
291 /* Displays input prompt on command line and takes input data from user */
293 char *silc_get_input(const char *prompt, SilcBool echo_off)
301 #ifdef HAVE_TERMIOS_H
303 struct termios to_old;
305 fd = open("/dev/tty", O_RDONLY);
307 silc_set_errno_posix(errno);
311 signal(SIGINT, SIG_IGN);
313 /* Get terminal info */
317 /* Echo OFF, and assure we can prompt and get input */
318 to.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
319 to.c_lflag |= ICANON;
321 tcsetattr(fd, TCSANOW, &to);
323 memset(input, 0, sizeof(input));
325 printf("%s", prompt);
328 if ((read(fd, input, sizeof(input))) < 0) {
329 silc_set_errno_posix(errno);
330 tcsetattr(fd, TCSANOW, &to_old);
334 if (strlen(input) <= 1) {
335 tcsetattr(fd, TCSANOW, &to_old);
336 silc_set_errno(SILC_ERR_EOF);
340 if (strchr(input, '\n'))
341 *strchr(input, '\n') = '\0';
343 /* Restore old terminfo */
344 tcsetattr(fd, TCSANOW, &to_old);
345 signal(SIGINT, SIG_DFL);
347 ret = silc_memdup(input, strlen(input));
348 memset(input, 0, sizeof(input));
349 #endif /* HAVE_TERMIOS_H */
352 fd = open("/dev/tty", O_RDONLY);
354 silc_set_errno_posix(errno);
358 memset(input, 0, sizeof(input));
360 printf("%s", prompt);
363 if ((read(fd, input, sizeof(input))) < 0) {
364 silc_set_errno_posix(errno);
368 if (strlen(input) <= 1) {
369 silc_set_errno(SILC_ERR_EOF);
373 if (strchr(input, '\n'))
374 *strchr(input, '\n') = '\0';
376 return silc_strdup(input);
380 #endif /* SILC_UNIX */
385 void silc_hexdump(const unsigned char *data, SilcUInt32 data_len,
398 if ((len - pos) < 16 && (len - pos <= len - off))
408 fprintf(output, "%08X ", k++ * 16);
410 for (i = 0; i < count; i++) {
411 fprintf(output, "%02X ", data[pos + i]);
413 if ((i + 1) % 4 == 0)
414 fprintf(output, " ");
417 if (count && count < 16) {
420 for (j = 0; j < 16 - count; j++) {
421 fprintf(output, " ");
423 if ((j + count + 1) % 4 == 0)
424 fprintf(output, " ");
428 for (i = 0; i < count; i++) {
431 if (data[pos] < 32 || data[pos] >= 127)
436 fprintf(output, "%c", ch);
441 fprintf(output, "\n");
448 /* Convert hex string to data. Each hex number must have two characters. */
450 SilcBool silc_hex2data(const char *hex, unsigned char *data,
451 SilcUInt32 data_size, SilcUInt32 *ret_data_len)
453 char *cp = (char *)hex;
457 if (data_size < strlen(hex) / 2) {
458 silc_set_errno(SILC_ERR_OVERFLOW);
462 for (i = 0; i < strlen(hex) / 2; i++) {
466 h -= h < 'A' ? '0' : 'A' - 10;
467 l -= l < 'A' ? '0' : 'A' - 10;
469 data[i] = (h << 4) | (l & 0xf);
478 /* Converts binary data to HEX string */
480 SilcBool silc_data2hex(const unsigned char *data, SilcUInt32 data_len,
481 char *hex, SilcUInt32 hex_size)
487 if (hex_size - 1 < data_len * 2) {
488 silc_set_errno(SILC_ERR_OVERFLOW);
492 memset(hex, 0, hex_size);
494 for (i = 0; i < data_len; i++) {
499 *cp++ = h + (h > 9 ? 'A' - 10 : '0');
500 *cp++ = l + (l > 9 ? 'A' - 10 : '0');