--- /dev/null
+/*
+ * IRC - Internet Relay Chat, ircd/ircd_string.c
+ * Copyright (C) 1999 Thomas Helvey
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 1, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/** @file
+ * @brief Implementation of string operations.
+ * @version $Id$
+ */
+#include "config.h"
+
+#include "ircd_string.h"
+#include "ircd_defs.h"
+#include "ircd_chattr.h"
+#include "ircd_log.h"
+#include "res.h"
+
+/* #include <assert.h> -- Now using assert in ircd_log.h */
+#include <string.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+
+/*
+ * include the character attribute tables here
+ */
+#include "chattr.tab.c"
+
+/** Check whether \a str contains wildcard characters.
+ * @param[in] str String that might contain wildcards.
+ * @return Non-zero if \a str contains naked (non-escaped) wildcards,
+ * zero if there are none or if they are all escaped.
+ */
+int string_has_wildcards(const char* str)
+{
+ assert(0 != str);
+ for ( ; *str; ++str) {
+ if ('\\' == *str) {
+ if ('\0' == *++str)
+ break;
+ }
+ else if ('*' == *str || '?' == *str)
+ return 1;
+ }
+ return 0;
+}
+
+/** Split a string on certain delimiters.
+ * This is a reentrant version of normal strtok(). The first call for
+ * a particular input string must use a non-NULL \a str; *save will be
+ * initialized based on that. Later calls must use a NULL \a str;
+ * *save will be updated.
+ * @param[in,out] save Pointer to a position indicator.
+ * @param[in] str Pointer to the input string, or NULL to continue.
+ * @param[in] fs String that lists token delimiters.
+ * @return Next token in input string, or NULL if no tokens remain.
+ */
+char* ircd_strtok(char **save, char *str, char *fs)
+{
+ char *pos = *save; /* keep last position across calls */
+ char *tmp;
+
+ if (str)
+ pos = str; /* new string scan */
+
+ while (pos && *pos && strchr(fs, *pos) != NULL)
+ pos++; /* skip leading separators */
+
+ if (!pos || !*pos)
+ return (pos = *save = NULL); /* string contains only sep's */
+
+ tmp = pos; /* now, keep position of the token */
+
+ while (*pos && strchr(fs, *pos) == NULL)
+ pos++; /* skip content of the token */
+
+ if (*pos)
+ *pos++ = '\0'; /* remove first sep after the token */
+ else
+ pos = NULL; /* end of string */
+
+ *save = pos;
+ return (tmp);
+}
+
+/** Rewrite a comma-delimited list of items to remove duplicates.
+ * @param[in,out] buffer Comma-delimited list.
+ * @return The input buffer \a buffer.
+ */
+char* canonize(char* buffer)
+{
+ static char cbuf[BUFSIZE];
+ char* s;
+ char* t;
+ char* cp = cbuf;
+ int l = 0;
+ char* p = NULL;
+ char* p2;
+
+ *cp = '\0';
+
+ for (s = ircd_strtok(&p, buffer, ","); s; s = ircd_strtok(&p, NULL, ","))
+ {
+ if (l)
+ {
+ p2 = NULL;
+ for (t = ircd_strtok(&p2, cbuf, ","); t; t = ircd_strtok(&p2, NULL, ","))
+ if (0 == ircd_strcmp(s, t))
+ break;
+ else if (p2)
+ p2[-1] = ',';
+ }
+ else
+ t = NULL;
+ if (!t)
+ {
+ if (l)
+ *(cp - 1) = ',';
+ else
+ l = 1;
+ strcpy(cp, s);
+ if (p)
+ cp += (p - s);
+ }
+ else if (p2)
+ p2[-1] = ',';
+ }
+ return cbuf;
+}
+
+/** Copy one string to another, not to exceed a certain length.
+ * @param[in] s1 Output buffer.
+ * @param[in] s2 Source buffer.
+ * @param[in] n Maximum number of bytes to write, plus one.
+ * @return The original input buffer \a s1.
+ */
+char* ircd_strncpy(char* s1, const char* s2, size_t n)
+{
+ char* endp = s1 + n;
+ char* s = s1;
+
+ assert(0 != s1);
+ assert(0 != s2);
+
+ while (s < endp && (*s++ = *s2++))
+ ;
+ if (s == endp)
+ *s = '\0';
+ return s1;
+}
+
+
+#ifndef FORCEINLINE
+NTL_HDR_strChattr { NTL_SRC_strChattr }
+NTL_HDR_strCasediff { NTL_SRC_strCasediff }
+#endif /* !FORCEINLINE */
+
+/*
+ * Other functions visible externally
+ */
+
+/** Case insensitive string comparison.
+ * @param[in] a First string to compare.
+ * @param[in] b Second string to compare.
+ * @return Less than, equal to, or greater than zero if \a a is lexicographically less than, equal to, or greater than \a b.
+ */
+int ircd_strcmp(const char *a, const char *b)
+{
+ const char* ra = a;
+ const char* rb = b;
+ while (ToLower(*ra) == ToLower(*rb)) {
+ if (!*ra++)
+ return 0;
+ else
+ ++rb;
+ }
+ return (ToLower(*ra) - ToLower(*rb));
+}
+
+/** Case insensitive comparison of the starts of two strings.
+ * @param[in] a First string to compare.
+ * @param[in] b Second string to compare.
+ * @param[in] n Maximum number of characters to compare.
+ * @return Less than, equal to, or greater than zero if \a a is
+ * lexicographically less than, equal to, or greater than \a b.
+ */
+int ircd_strncmp(const char *a, const char *b, size_t n)
+{
+ const char* ra = a;
+ const char* rb = b;
+ int left = n;
+ if (!left--)
+ return 0;
+ while (ToLower(*ra) == ToLower(*rb)) {
+ if (!*ra++ || !left--)
+ return 0;
+ else
+ ++rb;
+ }
+ return (ToLower(*ra) - ToLower(*rb));
+}
+
+/** Fill a vector of distinct names from a delimited input list.
+ * Empty tokens (when \a token occurs at the start or end of \a list,
+ * or when \a token occurs adjacent to itself) are ignored. When
+ * \a size tokens have been written to \a vector, the rest of the
+ * string is ignored.
+ * Unlike token_vector(), if a token repeats an earlier token, it is
+ * skipped.
+ * @param[in,out] names Input buffer.
+ * @param[in] token Delimiter used to split \a list.
+ * @param[out] vector Output vector.
+ * @param[in] size Maximum number of elements to put in \a vector.
+ * @return Number of elements written to \a vector.
+ */
+int unique_name_vector(char* names, char token, char** vector, int size)
+{
+ int i;
+ int count = 0;
+ char* start = names;
+ char* end;
+
+ assert(0 != names);
+ assert(0 != vector);
+ assert(0 < size);
+
+ /*
+ * ignore spurious tokens
+ */
+ while (token == *start)
+ ++start;
+
+ for (end = strchr(start, token); end; end = strchr(start, token)) {
+ *end++ = '\0';
+ /*
+ * ignore spurious tokens
+ */
+ while (token == *end)
+ ++end;
+ for (i = 0; i < count; ++i) {
+ if (0 == ircd_strcmp(vector[i], start))
+ break;
+ }
+ if (i == count) {
+ vector[count++] = start;
+ if (count == size)
+ return count;
+ }
+ start = end;
+ }
+ if (*start) {
+ for (i = 0; i < count; ++i)
+ if (0 == ircd_strcmp(vector[i], start))
+ return count;
+ vector[count++] = start;
+ }
+ return count;
+}
+
+/** Fill a vector of tokens from a delimited input list.
+ * Empty tokens (when \a token occurs at the start or end of \a list,
+ * or when \a token occurs adjacent to itself) are ignored. When
+ * \a size tokens have been written to \a vector, the rest of the
+ * string is ignored.
+ * @param[in,out] names Input buffer.
+ * @param[in] token Delimiter used to split \a list.
+ * @param[out] vector Output vector.
+ * @param[in] size Maximum number of elements to put in \a vector.
+ * @return Number of elements written to \a vector.
+ */
+int token_vector(char* names, char token, char** vector, int size)
+{
+ int count = 0;
+ char* start = names;
+ char* end;
+
+ assert(0 != names);
+ assert(0 != vector);
+ assert(1 < size);
+
+ vector[count++] = start;
+ for (end = strchr(start, token); end; end = strchr(start, token)) {
+ *end++ = '\0';
+ start = end;
+ if (*start) {
+ vector[count++] = start;
+ if (count < size)
+ continue;
+ }
+ break;
+ }
+ return count;
+}
+
+/** Copy all or part of the hostname in a string to another string.
+ * If \a userhost contains an '\@', the remaining portion is used;
+ * otherwise, the whole \a userhost is used.
+ * @param[out] buf Output buffer.
+ * @param[in] userhost user\@hostname or hostname string.
+ * @param[in] len Maximum number of bytes to write to \a host.
+ * @return The output buffer \a buf.
+ */
+char* host_from_uh(char* buf, const char* userhost, size_t len)
+{
+ const char* s;
+
+ assert(0 != buf);
+ assert(0 != userhost);
+
+ if ((s = strchr(userhost, '@')))
+ ++s;
+ else
+ s = userhost;
+ ircd_strncpy(buf, s, len);
+ buf[len] = '\0';
+ return buf;
+}
+
+/*
+ * this new faster inet_ntoa was ripped from:
+ * From: Thomas Helvey <tomh@inxpress.net>
+ */
+/** Array of text strings for dotted quads. */
+static const char* IpQuadTab[] =
+{
+ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
+ "10", "11", "12", "13", "14", "15", "16", "17", "18", "19",
+ "20", "21", "22", "23", "24", "25", "26", "27", "28", "29",
+ "30", "31", "32", "33", "34", "35", "36", "37", "38", "39",
+ "40", "41", "42", "43", "44", "45", "46", "47", "48", "49",
+ "50", "51", "52", "53", "54", "55", "56", "57", "58", "59",
+ "60", "61", "62", "63", "64", "65", "66", "67", "68", "69",
+ "70", "71", "72", "73", "74", "75", "76", "77", "78", "79",
+ "80", "81", "82", "83", "84", "85", "86", "87", "88", "89",
+ "90", "91", "92", "93", "94", "95", "96", "97", "98", "99",
+ "100", "101", "102", "103", "104", "105", "106", "107", "108", "109",
+ "110", "111", "112", "113", "114", "115", "116", "117", "118", "119",
+ "120", "121", "122", "123", "124", "125", "126", "127", "128", "129",
+ "130", "131", "132", "133", "134", "135", "136", "137", "138", "139",
+ "140", "141", "142", "143", "144", "145", "146", "147", "148", "149",
+ "150", "151", "152", "153", "154", "155", "156", "157", "158", "159",
+ "160", "161", "162", "163", "164", "165", "166", "167", "168", "169",
+ "170", "171", "172", "173", "174", "175", "176", "177", "178", "179",
+ "180", "181", "182", "183", "184", "185", "186", "187", "188", "189",
+ "190", "191", "192", "193", "194", "195", "196", "197", "198", "199",
+ "200", "201", "202", "203", "204", "205", "206", "207", "208", "209",
+ "210", "211", "212", "213", "214", "215", "216", "217", "218", "219",
+ "220", "221", "222", "223", "224", "225", "226", "227", "228", "229",
+ "230", "231", "232", "233", "234", "235", "236", "237", "238", "239",
+ "240", "241", "242", "243", "244", "245", "246", "247", "248", "249",
+ "250", "251", "252", "253", "254", "255"
+};
+
+/** Convert an IP address to printable ASCII form.
+ * This is generally deprecated in favor of ircd_ntoa_r().
+ * @param[in] in Address to convert.
+ * @return Pointer to a static buffer containing the readable form.
+ */
+const char* ircd_ntoa(const struct irc_in_addr* in)
+{
+ static char buf[SOCKIPLEN];
+ return ircd_ntoa_r(buf, in);
+}
+
+/** Convert an IP address to printable ASCII form.
+ * @param[out] buf Output buffer to write to.
+ * @param[in] in Address to format.
+ * @return Pointer to the output buffer \a buf.
+ */
+const char* ircd_ntoa_r(char* buf, const struct irc_in_addr* in)
+{
+ assert(buf != NULL);
+ assert(in != NULL);
+
+ if (irc_in_addr_is_ipv4(in)) {
+ unsigned int pos, len;
+ unsigned char *pch;
+
+ pch = (unsigned char*)&in->in6_16[6];
+ len = strlen(IpQuadTab[*pch]);
+ memcpy(buf, IpQuadTab[*pch++], len);
+ pos = len;
+ buf[pos++] = '.';
+ len = strlen(IpQuadTab[*pch]);
+ memcpy(buf+pos, IpQuadTab[*pch++], len);
+ pos += len;
+ buf[pos++] = '.';
+ len = strlen(IpQuadTab[*pch]);
+ memcpy(buf+pos, IpQuadTab[*pch++], len);
+ pos += len;
+ buf[pos++] = '.';
+ len = strlen(IpQuadTab[*pch]);
+ memcpy(buf+pos, IpQuadTab[*pch++], len);
+ buf[pos + len] = '\0';
+ return buf;
+ } else {
+ static const char hexdigits[] = "0123456789abcdef";
+ unsigned int pos, part, max_start, max_zeros, curr_zeros, ii;
+
+ /* Find longest run of zeros. */
+ for (max_start = ii = 1, max_zeros = curr_zeros = 0; ii < 8; ++ii) {
+ if (!in->in6_16[ii])
+ curr_zeros++;
+ else if (curr_zeros > max_zeros) {
+ max_start = ii - curr_zeros;
+ max_zeros = curr_zeros;
+ curr_zeros = 0;
+ }
+ }
+ if (curr_zeros > max_zeros) {
+ max_start = ii - curr_zeros;
+ max_zeros = curr_zeros;
+ }
+
+ /* Print out address. */
+/** Append \a CH to the output buffer. */
+#define APPEND(CH) do { buf[pos++] = (CH); } while (0)
+ for (pos = ii = 0; (ii < 8); ++ii) {
+ if ((max_zeros > 0) && (ii == max_start)) {
+ APPEND(':');
+ ii += max_zeros - 1;
+ continue;
+ }
+ part = ntohs(in->in6_16[ii]);
+ if (part >= 0x1000)
+ APPEND(hexdigits[part >> 12]);
+ if (part >= 0x100)
+ APPEND(hexdigits[(part >> 8) & 15]);
+ if (part >= 0x10)
+ APPEND(hexdigits[(part >> 4) & 15]);
+ APPEND(hexdigits[part & 15]);
+ if (ii < 7)
+ APPEND(':');
+ }
+#undef APPEND
+
+ /* Nul terminate and return number of characters used. */
+ buf[pos++] = '\0';
+ return buf;
+ }
+}
+
+/** Attempt to parse an IPv4 address into a network-endian form.
+ * @param[in] input Input string.
+ * @param[out] output Network-endian representation of the address.
+ * @param[out] pbits Number of bits found in pbits.
+ * @return Number of characters used from \a input, or 0 if the parse failed.
+ */
+static unsigned int
+ircd_aton_ip4(const char *input, unsigned int *output, unsigned char *pbits)
+{
+ unsigned int dots = 0, pos = 0, part = 0, ip = 0, bits;
+
+ /* Intentionally no support for bizarre IPv4 formats (plain
+ * integers, octal or hex components) -- only vanilla dotted
+ * decimal quads.
+ */
+ if (input[0] == '.')
+ return 0;
+ bits = 32;
+ while (1) switch (input[pos]) {
+ case '\0':
+ if (dots < 3)
+ return 0;
+ out:
+ ip |= part << (24 - 8 * dots);
+ *output = htonl(ip);
+ if (pbits)
+ *pbits = bits;
+ return pos;
+ case '.':
+ if (++dots > 3)
+ return 0;
+ if (input[++pos] == '.')
+ return 0;
+ ip |= part << (32 - 8 * dots);
+ part = 0;
+ if (input[pos] == '*') {
+ while (input[++pos] == '*' || input[pos] == '.') ;
+ if (input[pos] != '\0')
+ return 0;
+ if (pbits)
+ *pbits = dots * 8;
+ *output = htonl(ip);
+ return pos;
+ }
+ break;
+ case '/':
+ if (!pbits || !IsDigit(input[pos + 1]))
+ return 0;
+ for (bits = 0; IsDigit(input[++pos]); )
+ bits = bits * 10 + input[pos] - '0';
+ if (bits > 32)
+ return 0;
+ goto out;
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ part = part * 10 + input[pos++] - '0';
+ if (part > 255)
+ return 0;
+ break;
+ default:
+ return 0;
+ }
+}
+
+/** Parse a numeric IPv4 or IPv6 address into an irc_in_addr.
+ * @param[in] input Input buffer.
+ * @param[out] ip Receives parsed IP address.
+ * @param[out] pbits If non-NULL, receives number of bits specified in address mask.
+ * @return Number of characters used from \a input, or 0 if the
+ * address was unparseable or malformed.
+ */
+int
+ipmask_parse(const char *input, struct irc_in_addr *ip, unsigned char *pbits)
+{
+ char *colon;
+ char *dot;
+
+ assert(ip);
+ assert(input);
+ memset(ip, 0, sizeof(*ip));
+ colon = strchr(input, ':');
+ dot = strchr(input, '.');
+
+ if (colon && (!dot || (dot > colon))) {
+ unsigned int part = 0, pos = 0, ii = 0, colon = 8;
+ const char *part_start = NULL;
+
+ /* Parse IPv6, possibly like ::127.0.0.1.
+ * This is pretty straightforward; the only trick is borrowed
+ * from Paul Vixie (BIND): when it sees a "::" continue as if
+ * it were a single ":", but note where it happened, and fill
+ * with zeros afterward.
+ */
+ if (input[pos] == ':') {
+ if ((input[pos+1] != ':') || (input[pos+2] == ':'))
+ return 0;
+ colon = 0;
+ pos += 2;
+ part_start = input + pos;
+ }
+ while (ii < 8) switch (input[pos]) {
+ unsigned char chval;
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ chval = input[pos] - '0';
+ use_chval:
+ part = (part << 4) | chval;
+ if (part > 0xffff)
+ return 0;
+ pos++;
+ break;
+ case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+ chval = input[pos] - 'A' + 10;
+ goto use_chval;
+ case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+ chval = input[pos] - 'a' + 10;
+ goto use_chval;
+ case ':':
+ part_start = input + ++pos;
+ if (input[pos] == '.')
+ return 0;
+ ip->in6_16[ii++] = htons(part);
+ part = 0;
+ if (input[pos] == ':') {
+ if (colon < 8)
+ return 0;
+ if (ii == 8)
+ return 0;
+ colon = ii;
+ pos++;
+ }
+ break;
+ case '.': {
+ uint32_t ip4;
+ unsigned int len;
+ len = ircd_aton_ip4(part_start, &ip4, pbits);
+ if (!len || (ii > 6))
+ return 0;
+ ip->in6_16[ii++] = htons(ntohl(ip4) >> 16);
+ ip->in6_16[ii++] = htons(ntohl(ip4) & 65535);
+ if (pbits)
+ *pbits += 96;
+ pos = part_start + len - input;
+ goto finish;
+ }
+ case '/':
+ if (!pbits || !IsDigit(input[pos + 1]))
+ return 0;
+ ip->in6_16[ii++] = htons(part);
+ for (part = 0; IsDigit(input[++pos]); )
+ part = part * 10 + input[pos] - '0';
+ if (part > 128)
+ return 0;
+ *pbits = part;
+ goto finish;
+ case '*':
+ while (input[++pos] == '*' || input[pos] == ':') ;
+ if (input[pos] != '\0' || colon < 8)
+ return 0;
+ if (part && ii < 8)
+ ip->in6_16[ii++] = htons(part);
+ if (pbits)
+ *pbits = ii * 16;
+ return pos;
+ case '\0':
+ ip->in6_16[ii++] = htons(part);
+ if (colon == 8 && ii < 8)
+ return 0;
+ if (pbits)
+ *pbits = 128;
+ goto finish;
+ default:
+ return 0;
+ }
+ if (input[pos] != '\0')
+ return 0;
+ finish:
+ if (colon < 8) {
+ unsigned int jj;
+ /* Shift stuff after "::" up and fill middle with zeros. */
+ for (jj = 0; jj < ii - colon; jj++)
+ ip->in6_16[7 - jj] = ip->in6_16[ii - jj - 1];
+ for (jj = 0; jj < 8 - ii; jj++)
+ ip->in6_16[colon + jj] = 0;
+ }
+ return pos;
+ } else if (dot || strchr(input, '/')) {
+ unsigned int addr;
+ int len = ircd_aton_ip4(input, &addr, pbits);
+ if (len) {
+ ip->in6_16[5] = htons(65535);
+ ip->in6_16[6] = htons(ntohl(addr) >> 16);
+ ip->in6_16[7] = htons(ntohl(addr) & 65535);
+ if (pbits)
+ *pbits += 96;
+ }
+ return len;
+ } else if (input[0] == '*') {
+ unsigned int pos = 0;
+ while (input[++pos] == '*') ;
+ if (input[pos] != '\0')
+ return 0;
+ if (pbits)
+ *pbits = 0;
+ return pos;
+ } else return 0; /* parse failed */
+}
projects / ircu2.10.12-pk.git / blobdiff