349 lines
8.5 KiB
C
349 lines
8.5 KiB
C
/*
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* charybdis - an advanced ircd.
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* Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org>.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "stdinc.h"
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#include "ircd_defs.h"
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#include "msgbuf.h"
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#include "client.h"
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#include "ircd.h"
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static const char tag_escape_table[256] = {
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/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
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/* 0x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 'n', 0, 0, 'r', 0, 0,
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/* 1x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 2x */ 's', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 3x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ':', 0, 0, 0, 0,
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/* 4x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 5x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,'\\', 0, 0, 0,
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};
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static const char tag_unescape_table[256] = {
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/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
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/* 0x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 1x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 2x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 3x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ';', 0, 0, 0, 0, 0,
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/* 4x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 5x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,'\\', 0, 0, 0,
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/* 6x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,'\n', 0,
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/* 7x */ 0, 0,'\r', ' ', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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};
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static void
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msgbuf_unescape_value(char *value)
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{
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char *in = value;
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char *out = value;
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if (value == NULL)
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return;
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while (*in != '\0') {
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if (*in == '\\') {
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const char unescape = tag_unescape_table[(unsigned char)*++in];
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/* "\\\0" is unescaped to the character itself, "\0" */
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if (*in == '\0')
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break;
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if (unescape) {
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*out++ = unescape;
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*in++;
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} else {
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*out++ = *in++;
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}
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} else {
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*out++ = *in++;
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}
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}
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/* copy final '\0' */
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*out = *in;
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}
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/*
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* parse a message into a MsgBuf.
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* returns 0 on success, 1 on error.
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*/
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int
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msgbuf_parse(struct MsgBuf *msgbuf, char *line)
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{
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char *ch = line;
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msgbuf_init(msgbuf);
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if (*ch == '@') {
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char *t = ch + 1;
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ch = strchr(ch, ' ');
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/* truncate tags if they're too long */
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if ((ch != NULL && (ch - line) + 1 > TAGSLEN) || (ch == NULL && strlen(line) >= TAGSLEN)) {
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ch = &line[TAGSLEN - 1];
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}
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if (ch != NULL) {
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/* NULL terminate the tags string */
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*ch++ = '\0';
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while (1) {
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char *next = strchr(t, ';');
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char *eq = strchr(t, '=');
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if (next != NULL) {
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*next = '\0';
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if (eq > next)
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eq = NULL;
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}
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if (eq != NULL)
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*eq++ = '\0';
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if (*t != '\0') {
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msgbuf_unescape_value(eq);
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msgbuf_append_tag(msgbuf, t, eq, 0);
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}
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if (next != NULL) {
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t = next + 1;
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} else {
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break;
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}
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}
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} else {
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return 1;
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}
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}
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/* truncate message if it's too long */
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if (strlen(ch) > DATALEN) {
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ch[DATALEN] = '\0';
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}
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if (*ch == ':') {
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ch++;
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msgbuf->origin = ch;
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char *end = strchr(ch, ' ');
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if (end == NULL)
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return 4;
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*end = '\0';
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ch = end + 1;
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}
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if (*ch == '\0')
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return 2;
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msgbuf->n_para = rb_string_to_array(ch, (char **)msgbuf->para, MAXPARA);
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if (msgbuf->n_para == 0)
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return 3;
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msgbuf->cmd = msgbuf->para[0];
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return 0;
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}
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/*
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* Unparse msgbuf tags into a buffer
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* returns the length of the tags written
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*/
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static size_t
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msgbuf_unparse_tags(char *buf, size_t buflen, const struct MsgBuf *msgbuf, unsigned int capmask)
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{
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bool has_tags = false;
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char *commit = buf;
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char *output = buf;
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const char * const end = &buf[buflen - 2]; /* this is where the final ' ' goes */
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for (size_t i = 0; i < msgbuf->n_tags; i++) {
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size_t len;
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if ((msgbuf->tags[i].capmask & capmask) == 0)
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continue;
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if (has_tags) {
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if (output >= end)
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break;
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*output++ = ';';
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} else {
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if (output >= end)
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break;
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*output++ = '@';
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}
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if (msgbuf->tags[i].key == NULL)
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continue;
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len = strlen(msgbuf->tags[i].key);
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if (len == 0)
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continue;
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if (output + len > end)
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break;
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strcat(output, msgbuf->tags[i].key);
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output += len;
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if (msgbuf->tags[i].value != NULL) {
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if (output >= end)
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break;
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*output++ = '=';
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len = strlen(msgbuf->tags[i].value);
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/* this only checks the unescaped length,
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* but the escaped length could be longer
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*/
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if (output + len > end)
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break;
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for (size_t n = 0; n < len; n++) {
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const unsigned char c = msgbuf->tags[i].value[n];
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const char escape = tag_escape_table[c];
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if (escape) {
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if (output + 2 > end)
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break;
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*output++ = '\\';
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*output++ = escape;
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} else {
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if (output >= end)
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break;
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*output++ = c;
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}
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}
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}
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has_tags = true;
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commit = output;
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}
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if (has_tags)
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*commit++ = ' ';
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*commit = 0;
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return commit - buf;
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}
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/*
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* unparse a MsgBuf and message prefix into a buffer
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* if origin is NULL, me.name will be used.
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* cmd should not be NULL.
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* updates buflen to correctly allow remaining message data to be added
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*/
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void
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msgbuf_unparse_prefix(char *buf, size_t *buflen, const struct MsgBuf *msgbuf, unsigned int capmask)
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{
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size_t tags_buflen;
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size_t tags_used = 0;
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memset(buf, 0, *buflen);
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tags_buflen = *buflen;
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if (tags_buflen > TAGSLEN + 1)
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tags_buflen = TAGSLEN + 1;
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if (msgbuf->n_tags > 0)
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tags_used = msgbuf_unparse_tags(buf, tags_buflen, msgbuf, capmask);
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const size_t data_bufmax = (tags_used + DATALEN + 1);
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if (*buflen > data_bufmax)
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*buflen = data_bufmax;
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rb_snprintf_append(buf, *buflen, ":%s ", msgbuf->origin != NULL ? msgbuf->origin : me.name);
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if (msgbuf->cmd != NULL)
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rb_snprintf_append(buf, *buflen, "%s ", msgbuf->cmd);
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if (msgbuf->target != NULL)
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rb_snprintf_append(buf, *buflen, "%s ", msgbuf->target);
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}
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/*
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* unparse a pure MsgBuf into a buffer.
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* if origin is NULL, me.name will be used.
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* cmd should not be NULL.
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* returns 0 on success, 1 on error.
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*/
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int
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msgbuf_unparse(char *buf, size_t buflen, const struct MsgBuf *msgbuf, unsigned int capmask)
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{
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size_t buflen_copy = buflen;
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msgbuf_unparse_prefix(buf, &buflen_copy, msgbuf, capmask);
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for (size_t i = 0; i < msgbuf->n_para; i++) {
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const char *fmt;
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if (i == (msgbuf->n_para - 1) && strchr(msgbuf->para[i], ' ') != NULL) {
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fmt = (i == 0) ? ":%s" : " :%s";
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} else {
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fmt = (i == 0) ? "%s" : " %s";
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}
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rb_snprintf_append(buf, buflen_copy, fmt, msgbuf->para[i]);
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}
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return 0;
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}
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/*
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* unparse a MsgBuf stem + format string into a buffer
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* if origin is NULL, me.name will be used.
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* cmd may not be NULL.
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* returns 0 on success, 1 on error.
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*/
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int
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msgbuf_vunparse_fmt(char *buf, size_t buflen, const struct MsgBuf *head, unsigned int capmask, const char *fmt, va_list va)
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{
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size_t buflen_copy = buflen;
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char *ws;
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size_t prefixlen;
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msgbuf_unparse_prefix(buf, &buflen_copy, head, capmask);
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prefixlen = strlen(buf);
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ws = buf + prefixlen;
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vsnprintf(ws, buflen_copy - prefixlen, fmt, va);
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return 0;
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}
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/*
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* unparse a MsgBuf stem + format string into a buffer (with va_list handling)
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* if origin is NULL, me.name will be used.
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* cmd may not be NULL.
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* returns 0 on success, 1 on error.
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*/
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int
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msgbuf_unparse_fmt(char *buf, size_t buflen, const struct MsgBuf *head, unsigned int capmask, const char *fmt, ...)
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{
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va_list va;
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int res;
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va_start(va, fmt);
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res = msgbuf_vunparse_fmt(buf, buflen, head, capmask, fmt, va);
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va_end(va);
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return res;
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}
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