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-rw-r--r--ldns/parseutil.c726
1 files changed, 726 insertions, 0 deletions
diff --git a/ldns/parseutil.c b/ldns/parseutil.c
new file mode 100644
index 000000000000..55e3a5b1ad9c
--- /dev/null
+++ b/ldns/parseutil.c
@@ -0,0 +1,726 @@
+/*
+ * parseutil.c - parse utilities for string and wire conversion
+ *
+ * (c) NLnet Labs, 2004-2006
+ *
+ * See the file LICENSE for the license
+ */
+/**
+ * \file
+ *
+ * Utility functions for parsing, base32(DNS variant) and base64 encoding
+ * and decoding, Hex, Time units, Escape codes.
+ */
+
+#include "config.h"
+#include "ldns/parseutil.h"
+#include <sys/time.h>
+#include <time.h>
+#include <ctype.h>
+
+sldns_lookup_table *
+sldns_lookup_by_name(sldns_lookup_table *table, const char *name)
+{
+ while (table->name != NULL) {
+ if (strcasecmp(name, table->name) == 0)
+ return table;
+ table++;
+ }
+ return NULL;
+}
+
+sldns_lookup_table *
+sldns_lookup_by_id(sldns_lookup_table *table, int id)
+{
+ while (table->name != NULL) {
+ if (table->id == id)
+ return table;
+ table++;
+ }
+ return NULL;
+}
+
+/* Number of days per month (except for February in leap years). */
+static const int mdays[] = {
+ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+#define LDNS_MOD(x,y) (((x) % (y) < 0) ? ((x) % (y) + (y)) : ((x) % (y)))
+#define LDNS_DIV(x,y) (((x) % (y) < 0) ? ((x) / (y) - 1 ) : ((x) / (y)))
+
+static int
+is_leap_year(int year)
+{
+ return LDNS_MOD(year, 4) == 0 && (LDNS_MOD(year, 100) != 0
+ || LDNS_MOD(year, 400) == 0);
+}
+
+static int
+leap_days(int y1, int y2)
+{
+ --y1;
+ --y2;
+ return (LDNS_DIV(y2, 4) - LDNS_DIV(y1, 4)) -
+ (LDNS_DIV(y2, 100) - LDNS_DIV(y1, 100)) +
+ (LDNS_DIV(y2, 400) - LDNS_DIV(y1, 400));
+}
+
+/*
+ * Code adapted from Python 2.4.1 sources (Lib/calendar.py).
+ */
+time_t
+sldns_mktime_from_utc(const struct tm *tm)
+{
+ int year = 1900 + tm->tm_year;
+ time_t days = 365 * ((time_t) year - 1970) + leap_days(1970, year);
+ time_t hours;
+ time_t minutes;
+ time_t seconds;
+ int i;
+
+ for (i = 0; i < tm->tm_mon; ++i) {
+ days += mdays[i];
+ }
+ if (tm->tm_mon > 1 && is_leap_year(year)) {
+ ++days;
+ }
+ days += tm->tm_mday - 1;
+
+ hours = days * 24 + tm->tm_hour;
+ minutes = hours * 60 + tm->tm_min;
+ seconds = minutes * 60 + tm->tm_sec;
+
+ return seconds;
+}
+
+#if SIZEOF_TIME_T <= 4
+
+static void
+sldns_year_and_yday_from_days_since_epoch(int64_t days, struct tm *result)
+{
+ int year = 1970;
+ int new_year;
+
+ while (days < 0 || days >= (int64_t) (is_leap_year(year) ? 366 : 365)) {
+ new_year = year + (int) LDNS_DIV(days, 365);
+ days -= (new_year - year) * 365;
+ days -= leap_days(year, new_year);
+ year = new_year;
+ }
+ result->tm_year = year;
+ result->tm_yday = (int) days;
+}
+
+/* Number of days per month in a leap year. */
+static const int leap_year_mdays[] = {
+ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+static void
+sldns_mon_and_mday_from_year_and_yday(struct tm *result)
+{
+ int idays = result->tm_yday;
+ const int *mon_lengths = is_leap_year(result->tm_year) ?
+ leap_year_mdays : mdays;
+
+ result->tm_mon = 0;
+ while (idays >= mon_lengths[result->tm_mon]) {
+ idays -= mon_lengths[result->tm_mon++];
+ }
+ result->tm_mday = idays + 1;
+}
+
+static void
+sldns_wday_from_year_and_yday(struct tm *result)
+{
+ result->tm_wday = 4 /* 1-1-1970 was a thursday */
+ + LDNS_MOD((result->tm_year - 1970), 7) * LDNS_MOD(365, 7)
+ + leap_days(1970, result->tm_year)
+ + result->tm_yday;
+ result->tm_wday = LDNS_MOD(result->tm_wday, 7);
+ if (result->tm_wday < 0) {
+ result->tm_wday += 7;
+ }
+}
+
+static struct tm *
+sldns_gmtime64_r(int64_t clock, struct tm *result)
+{
+ result->tm_isdst = 0;
+ result->tm_sec = (int) LDNS_MOD(clock, 60);
+ clock = LDNS_DIV(clock, 60);
+ result->tm_min = (int) LDNS_MOD(clock, 60);
+ clock = LDNS_DIV(clock, 60);
+ result->tm_hour = (int) LDNS_MOD(clock, 24);
+ clock = LDNS_DIV(clock, 24);
+
+ sldns_year_and_yday_from_days_since_epoch(clock, result);
+ sldns_mon_and_mday_from_year_and_yday(result);
+ sldns_wday_from_year_and_yday(result);
+ result->tm_year -= 1900;
+
+ return result;
+}
+
+#endif /* SIZEOF_TIME_T <= 4 */
+
+static int64_t
+sldns_serial_arithmitics_time(int32_t time, time_t now)
+{
+ int32_t offset = time - (int32_t) now;
+ return (int64_t) now + offset;
+}
+
+struct tm *
+sldns_serial_arithmitics_gmtime_r(int32_t time, time_t now, struct tm *result)
+{
+#if SIZEOF_TIME_T <= 4
+ int64_t secs_since_epoch = sldns_serial_arithmitics_time(time, now);
+ return sldns_gmtime64_r(secs_since_epoch, result);
+#else
+ time_t secs_since_epoch = sldns_serial_arithmitics_time(time, now);
+ return gmtime_r(&secs_since_epoch, result);
+#endif
+}
+
+int
+sldns_hexdigit_to_int(char ch)
+{
+ switch (ch) {
+ case '0': return 0;
+ case '1': return 1;
+ case '2': return 2;
+ case '3': return 3;
+ case '4': return 4;
+ case '5': return 5;
+ case '6': return 6;
+ case '7': return 7;
+ case '8': return 8;
+ case '9': return 9;
+ case 'a': case 'A': return 10;
+ case 'b': case 'B': return 11;
+ case 'c': case 'C': return 12;
+ case 'd': case 'D': return 13;
+ case 'e': case 'E': return 14;
+ case 'f': case 'F': return 15;
+ default:
+ return -1;
+ }
+}
+
+uint32_t
+sldns_str2period(const char *nptr, const char **endptr)
+{
+ int sign = 0;
+ uint32_t i = 0;
+ uint32_t seconds = 0;
+
+ for(*endptr = nptr; **endptr; (*endptr)++) {
+ switch (**endptr) {
+ case ' ':
+ case '\t':
+ break;
+ case '-':
+ if(sign == 0) {
+ sign = -1;
+ } else {
+ return seconds;
+ }
+ break;
+ case '+':
+ if(sign == 0) {
+ sign = 1;
+ } else {
+ return seconds;
+ }
+ break;
+ case 's':
+ case 'S':
+ seconds += i;
+ i = 0;
+ break;
+ case 'm':
+ case 'M':
+ seconds += i * 60;
+ i = 0;
+ break;
+ case 'h':
+ case 'H':
+ seconds += i * 60 * 60;
+ i = 0;
+ break;
+ case 'd':
+ case 'D':
+ seconds += i * 60 * 60 * 24;
+ i = 0;
+ break;
+ case 'w':
+ case 'W':
+ seconds += i * 60 * 60 * 24 * 7;
+ i = 0;
+ break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ i *= 10;
+ i += (**endptr - '0');
+ break;
+ default:
+ seconds += i;
+ /* disregard signedness */
+ return seconds;
+ }
+ }
+ seconds += i;
+ /* disregard signedness */
+ return seconds;
+}
+
+int
+sldns_parse_escape(uint8_t *ch_p, const char** str_p)
+{
+ uint16_t val;
+
+ if ((*str_p)[0] && isdigit((*str_p)[0]) &&
+ (*str_p)[1] && isdigit((*str_p)[1]) &&
+ (*str_p)[2] && isdigit((*str_p)[2])) {
+
+ val = (uint16_t)(((*str_p)[0] - '0') * 100 +
+ ((*str_p)[1] - '0') * 10 +
+ ((*str_p)[2] - '0'));
+
+ if (val > 255) {
+ goto error;
+ }
+ *ch_p = (uint8_t)val;
+ *str_p += 3;
+ return 1;
+
+ } else if ((*str_p)[0] && !isdigit((*str_p)[0])) {
+
+ *ch_p = (uint8_t)*(*str_p)++;
+ return 1;
+ }
+error:
+ *str_p = NULL;
+ return 0; /* LDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE */
+}
+
+/** parse one character, with escape codes */
+int
+sldns_parse_char(uint8_t *ch_p, const char** str_p)
+{
+ switch (**str_p) {
+
+ case '\0': return 0;
+
+ case '\\': *str_p += 1;
+ return sldns_parse_escape(ch_p, str_p);
+
+ default: *ch_p = (uint8_t)*(*str_p)++;
+ return 1;
+ }
+}
+
+size_t sldns_b32_ntop_calculate_size(size_t src_data_length)
+{
+ return src_data_length == 0 ? 0 : ((src_data_length - 1) / 5 + 1) * 8;
+}
+
+size_t sldns_b32_ntop_calculate_size_no_padding(size_t src_data_length)
+{
+ return ((src_data_length + 3) * 8 / 5) - 4;
+}
+
+static int
+sldns_b32_ntop_base(const uint8_t* src, size_t src_sz, char* dst, size_t dst_sz,
+ int extended_hex, int add_padding)
+{
+ size_t ret_sz;
+ const char* b32 = extended_hex ? "0123456789abcdefghijklmnopqrstuv"
+ : "abcdefghijklmnopqrstuvwxyz234567";
+
+ size_t c = 0; /* c is used to carry partial base32 character over
+ * byte boundaries for sizes with a remainder.
+ * (i.e. src_sz % 5 != 0)
+ */
+
+ ret_sz = add_padding ? sldns_b32_ntop_calculate_size(src_sz)
+ : sldns_b32_ntop_calculate_size_no_padding(src_sz);
+
+ /* Do we have enough space? */
+ if (dst_sz < ret_sz + 1)
+ return -1;
+
+ /* We know the size; terminate the string */
+ dst[ret_sz] = '\0';
+
+ /* First process all chunks of five */
+ while (src_sz >= 5) {
+ /* 00000... ........ ........ ........ ........ */
+ dst[0] = b32[(src[0] ) >> 3];
+
+ /* .....111 11...... ........ ........ ........ */
+ dst[1] = b32[(src[0] & 0x07) << 2 | src[1] >> 6];
+
+ /* ........ ..22222. ........ ........ ........ */
+ dst[2] = b32[(src[1] & 0x3e) >> 1];
+
+ /* ........ .......3 3333.... ........ ........ */
+ dst[3] = b32[(src[1] & 0x01) << 4 | src[2] >> 4];
+
+ /* ........ ........ ....4444 4....... ........ */
+ dst[4] = b32[(src[2] & 0x0f) << 1 | src[3] >> 7];
+
+ /* ........ ........ ........ .55555.. ........ */
+ dst[5] = b32[(src[3] & 0x7c) >> 2];
+
+ /* ........ ........ ........ ......66 666..... */
+ dst[6] = b32[(src[3] & 0x03) << 3 | src[4] >> 5];
+
+ /* ........ ........ ........ ........ ...77777 */
+ dst[7] = b32[(src[4] & 0x1f) ];
+
+ src_sz -= 5;
+ src += 5;
+ dst += 8;
+ }
+ /* Process what remains */
+ switch (src_sz) {
+ case 4: /* ........ ........ ........ ......66 666..... */
+ dst[6] = b32[(src[3] & 0x03) << 3];
+
+ /* ........ ........ ........ .55555.. ........ */
+ dst[5] = b32[(src[3] & 0x7c) >> 2];
+
+ /* ........ ........ ....4444 4....... ........ */
+ c = src[3] >> 7 ;
+ case 3: dst[4] = b32[(src[2] & 0x0f) << 1 | c];
+
+ /* ........ .......3 3333.... ........ ........ */
+ c = src[2] >> 4 ;
+ case 2: dst[3] = b32[(src[1] & 0x01) << 4 | c];
+
+ /* ........ ..22222. ........ ........ ........ */
+ dst[2] = b32[(src[1] & 0x3e) >> 1];
+
+ /* .....111 11...... ........ ........ ........ */
+ c = src[1] >> 6 ;
+ case 1: dst[1] = b32[(src[0] & 0x07) << 2 | c];
+
+ /* 00000... ........ ........ ........ ........ */
+ dst[0] = b32[ src[0] >> 3];
+ }
+ /* Add padding */
+ if (add_padding) {
+ switch (src_sz) {
+ case 1: dst[2] = '=';
+ dst[3] = '=';
+ case 2: dst[4] = '=';
+ case 3: dst[5] = '=';
+ dst[6] = '=';
+ case 4: dst[7] = '=';
+ }
+ }
+ return (int)ret_sz;
+}
+
+int
+sldns_b32_ntop(const uint8_t* src, size_t src_sz, char* dst, size_t dst_sz)
+{
+ return sldns_b32_ntop_base(src, src_sz, dst, dst_sz, 0, 1);
+}
+
+int
+sldns_b32_ntop_extended_hex(const uint8_t* src, size_t src_sz,
+ char* dst, size_t dst_sz)
+{
+ return sldns_b32_ntop_base(src, src_sz, dst, dst_sz, 1, 1);
+}
+
+size_t sldns_b32_pton_calculate_size(size_t src_text_length)
+{
+ return src_text_length * 5 / 8;
+}
+
+static int
+sldns_b32_pton_base(const char* src, size_t src_sz, uint8_t* dst, size_t dst_sz,
+ int extended_hex, int check_padding)
+{
+ size_t i = 0;
+ char ch = '\0';
+ uint8_t buf[8];
+ uint8_t* start = dst;
+
+ while (src_sz) {
+ /* Collect 8 characters in buf (if possible) */
+ for (i = 0; i < 8; i++) {
+
+ do {
+ ch = *src++;
+ --src_sz;
+
+ } while (isspace(ch) && src_sz > 0);
+
+ if (ch == '=' || ch == '\0')
+ break;
+
+ else if (extended_hex)
+
+ if (ch >= '0' && ch <= '9')
+ buf[i] = (uint8_t)ch - '0';
+ else if (ch >= 'a' && ch <= 'v')
+ buf[i] = (uint8_t)ch - 'a' + 10;
+ else if (ch >= 'A' && ch <= 'V')
+ buf[i] = (uint8_t)ch - 'A' + 10;
+ else
+ return -1;
+
+ else if (ch >= 'a' && ch <= 'z')
+ buf[i] = (uint8_t)ch - 'a';
+ else if (ch >= 'A' && ch <= 'Z')
+ buf[i] = (uint8_t)ch - 'A';
+ else if (ch >= '2' && ch <= '7')
+ buf[i] = (uint8_t)ch - '2' + 26;
+ else
+ return -1;
+ }
+ /* Less that 8 characters. We're done. */
+ if (i < 8)
+ break;
+
+ /* Enough space available at the destination? */
+ if (dst_sz < 5)
+ return -1;
+
+ /* 00000... ........ ........ ........ ........ */
+ /* .....111 11...... ........ ........ ........ */
+ dst[0] = buf[0] << 3 | buf[1] >> 2;
+
+ /* .....111 11...... ........ ........ ........ */
+ /* ........ ..22222. ........ ........ ........ */
+ /* ........ .......3 3333.... ........ ........ */
+ dst[1] = buf[1] << 6 | buf[2] << 1 | buf[3] >> 4;
+
+ /* ........ .......3 3333.... ........ ........ */
+ /* ........ ........ ....4444 4....... ........ */
+ dst[2] = buf[3] << 4 | buf[4] >> 1;
+
+ /* ........ ........ ....4444 4....... ........ */
+ /* ........ ........ ........ .55555.. ........ */
+ /* ........ ........ ........ ......66 666..... */
+ dst[3] = buf[4] << 7 | buf[5] << 2 | buf[6] >> 3;
+
+ /* ........ ........ ........ ......66 666..... */
+ /* ........ ........ ........ ........ ...77777 */
+ dst[4] = buf[6] << 5 | buf[7];
+
+ dst += 5;
+ dst_sz -= 5;
+ }
+ /* Not ending on a eight byte boundary? */
+ if (i > 0 && i < 8) {
+
+ /* Enough space available at the destination? */
+ if (dst_sz < (i + 1) / 2)
+ return -1;
+
+ switch (i) {
+ case 7: /* ........ ........ ........ ......66 666..... */
+ /* ........ ........ ........ .55555.. ........ */
+ /* ........ ........ ....4444 4....... ........ */
+ dst[3] = buf[4] << 7 | buf[5] << 2 | buf[6] >> 3;
+
+ case 5: /* ........ ........ ....4444 4....... ........ */
+ /* ........ .......3 3333.... ........ ........ */
+ dst[2] = buf[3] << 4 | buf[4] >> 1;
+
+ case 4: /* ........ .......3 3333.... ........ ........ */
+ /* ........ ..22222. ........ ........ ........ */
+ /* .....111 11...... ........ ........ ........ */
+ dst[1] = buf[1] << 6 | buf[2] << 1 | buf[3] >> 4;
+
+ case 2: /* .....111 11...... ........ ........ ........ */
+ /* 00000... ........ ........ ........ ........ */
+ dst[0] = buf[0] << 3 | buf[1] >> 2;
+
+ break;
+
+ default:
+ return -1;
+ }
+ dst += (i + 1) / 2;
+
+ if (check_padding) {
+ /* Check remaining padding characters */
+ if (ch != '=')
+ return -1;
+
+ /* One down, 8 - i - 1 more to come... */
+ for (i = 8 - i - 1; i > 0; i--) {
+
+ do {
+ if (src_sz == 0)
+ return -1;
+ ch = *src++;
+ src_sz--;
+
+ } while (isspace(ch));
+
+ if (ch != '=')
+ return -1;
+ }
+ }
+ }
+ return dst - start;
+}
+
+int
+sldns_b32_pton(const char* src, size_t src_sz, uint8_t* dst, size_t dst_sz)
+{
+ return sldns_b32_pton_base(src, src_sz, dst, dst_sz, 0, 1);
+}
+
+int
+sldns_b32_pton_extended_hex(const char* src, size_t src_sz,
+ uint8_t* dst, size_t dst_sz)
+{
+ return sldns_b32_pton_base(src, src_sz, dst, dst_sz, 1, 1);
+}
+
+size_t sldns_b64_ntop_calculate_size(size_t srcsize)
+{
+ return ((((srcsize + 2) / 3) * 4) + 1);
+}
+
+/* RFC 1521, section 5.2.
+ *
+ * The encoding process represents 24-bit groups of input bits as output
+ * strings of 4 encoded characters. Proceeding from left to right, a
+ * 24-bit input group is formed by concatenating 3 8-bit input groups.
+ * These 24 bits are then treated as 4 concatenated 6-bit groups, each
+ * of which is translated into a single digit in the base64 alphabet.
+ *
+ * This routine does not insert spaces or linebreaks after 76 characters.
+ */
+int sldns_b64_ntop(uint8_t const *src, size_t srclength,
+ char *target, size_t targsize)
+{
+ const char* b64 =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+ const char pad64 = '=';
+ size_t i = 0, o = 0;
+ if(targsize < sldns_b64_ntop_calculate_size(srclength))
+ return -1;
+ /* whole chunks: xxxxxxyy yyyyzzzz zzwwwwww */
+ while(i+3 <= srclength) {
+ if(o+4 > targsize) return -1;
+ target[o] = b64[src[i] >> 2];
+ target[o+1] = b64[ ((src[i]&0x03)<<4) | (src[i+1]>>4) ];
+ target[o+2] = b64[ ((src[i+1]&0x0f)<<2) | (src[i+2]>>6) ];
+ target[o+3] = b64[ (src[i+2]&0x3f) ];
+ i += 3;
+ o += 4;
+ }
+ /* remainder */
+ switch(srclength - i) {
+ case 2:
+ /* two at end, converted into A B C = */
+ target[o] = b64[src[i] >> 2];
+ target[o+1] = b64[ ((src[i]&0x03)<<4) | (src[i+1]>>4) ];
+ target[o+2] = b64[ ((src[i+1]&0x0f)<<2) ];
+ target[o+3] = pad64;
+ i += 2;
+ o += 4;
+ break;
+ case 1:
+ /* one at end, converted into A B = = */
+ target[o] = b64[src[i] >> 2];
+ target[o+1] = b64[ ((src[i]&0x03)<<4) ];
+ target[o+2] = pad64;
+ target[o+3] = pad64;
+ i += 1;
+ o += 4;
+ break;
+ case 0:
+ default:
+ /* nothing */
+ break;
+ }
+ /* assert: i == srclength */
+ if(o+1 > targsize) return -1;
+ target[o] = 0;
+ return (int)o;
+}
+
+size_t sldns_b64_pton_calculate_size(size_t srcsize)
+{
+ return (((((srcsize + 3) / 4) * 3)) + 1);
+}
+
+int sldns_b64_pton(char const *src, uint8_t *target, size_t targsize)
+{
+ const uint8_t pad64 = 64; /* is 64th in the b64 array */
+ const char* s = src;
+ uint8_t in[4];
+ size_t o = 0, incount = 0;
+
+ while(*s) {
+ /* skip any character that is not base64 */
+ /* conceptually we do:
+ const char* b64 = pad'=' is appended to array
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+ const char* d = strchr(b64, *s++);
+ and use d-b64;
+ */
+ char d = *s++;
+ if(d <= 'Z' && d >= 'A')
+ d -= 'A';
+ else if(d <= 'z' && d >= 'a')
+ d = d - 'a' + 26;
+ else if(d <= '9' && d >= '0')
+ d = d - '0' + 52;
+ else if(d == '+')
+ d = 62;
+ else if(d == '/')
+ d = 63;
+ else if(d == '=')
+ d = 64;
+ else continue;
+ in[incount++] = (uint8_t)d;
+ if(incount != 4)
+ continue;
+ /* process whole block of 4 characters into 3 output bytes */
+ if(in[3] == pad64 && in[2] == pad64) { /* A B = = */
+ if(o+1 > targsize)
+ return -1;
+ target[o] = (in[0]<<2) | ((in[1]&0x30)>>4);
+ o += 1;
+ break; /* we are done */
+ } else if(in[3] == pad64) { /* A B C = */
+ if(o+2 > targsize)
+ return -1;
+ target[o] = (in[0]<<2) | ((in[1]&0x30)>>4);
+ target[o+1]= ((in[1]&0x0f)<<4) | ((in[2]&0x3c)>>2);
+ o += 2;
+ break; /* we are done */
+ } else {
+ if(o+3 > targsize)
+ return -1;
+ /* write xxxxxxyy yyyyzzzz zzwwwwww */
+ target[o] = (in[0]<<2) | ((in[1]&0x30)>>4);
+ target[o+1]= ((in[1]&0x0f)<<4) | ((in[2]&0x3c)>>2);
+ target[o+2]= ((in[2]&0x03)<<6) | in[3];
+ o += 3;
+ }
+ incount = 0;
+ }
+ return (int)o;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 18:28:26 +0000