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/*
* File: dpiutil.c
*
* Copyright 2004-2007 Jorge Arellano Cid <jcid@dillo.org>
*
* 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 3 of the License, or
* (at your option) any later version.
*
*/
#include <unistd.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/socket.h>
#include "dpiutil.h"
/*
* Debugging macros
*/
#define _MSG(...)
#define MSG(...) printf("[dpiutil.c]: " __VA_ARGS__)
/* Escaping/De-escaping ---------------------------------------------------*/
/*
* Escape URI characters in 'esc_set' as %XX sequences.
* Return value: New escaped string.
*/
char *Escape_uri_str(const char *str, const char *p_esc_set)
{
static const char *esc_set, *hex = "0123456789ABCDEF";
char *p;
Dstr *dstr;
int i;
esc_set = (p_esc_set) ? p_esc_set : "%#:' ";
dstr = dStr_sized_new(64);
for (i = 0; str[i]; ++i) {
if (str[i] <= 0x1F || str[i] == 0x7F || strchr(esc_set, str[i])) {
dStr_append_c(dstr, '%');
dStr_append_c(dstr, hex[(str[i] >> 4) & 15]);
dStr_append_c(dstr, hex[str[i] & 15]);
} else {
dStr_append_c(dstr, str[i]);
}
}
p = dstr->str;
dStr_free(dstr, FALSE);
return p;
}
/*
* Unescape %XX sequences in a string.
* Return value: a new unescaped string
*/
char *Unescape_uri_str(const char *s)
{
char *p, *buf = dStrdup(s);
if (strchr(s, '%')) {
for (p = buf; (*p = *s); ++s, ++p) {
if (*p == '%' && isxdigit(s[1]) && isxdigit(s[2])) {
*p = (isdigit(s[1]) ? (s[1] - '0') : toupper(s[1]) - 'A' + 10)*16;
*p += isdigit(s[2]) ? (s[2] - '0') : toupper(s[2]) - 'A' + 10;
s += 2;
}
}
}
return buf;
}
static const char *unsafe_chars = "&<>\"'";
static const char *unsafe_rep[] =
{ "&", "<", ">", """, "'" };
static const int unsafe_rep_len[] = { 5, 4, 4, 6, 5 };
/*
* Escape unsafe characters as html entities.
* Return value: New escaped string.
*/
char *Escape_html_str(const char *str)
{
int i;
char *p;
Dstr *dstr = dStr_sized_new(64);
for (i = 0; str[i]; ++i) {
if ((p = strchr(unsafe_chars, str[i])))
dStr_append(dstr, unsafe_rep[p - unsafe_chars]);
else
dStr_append_c(dstr, str[i]);
}
p = dstr->str;
dStr_free(dstr, FALSE);
return p;
}
/*
* Unescape a few HTML entities (inverse of Escape_html_str)
* Return value: New unescaped string.
*/
char *Unescape_html_str(const char *str)
{
int i, j, k;
char *u_str = dStrdup(str);
if (!strchr(str, '&'))
return u_str;
for (i = 0, j = 0; str[i]; ++i) {
if (str[i] == '&') {
for (k = 0; k < 5; ++k) {
if (!dStrncasecmp(str + i, unsafe_rep[k], unsafe_rep_len[k])) {
i += unsafe_rep_len[k] - 1;
break;
}
}
u_str[j++] = (k < 5) ? unsafe_chars[k] : str[i];
} else {
u_str[j++] = str[i];
}
}
u_str[j] = 0;
return u_str;
}
/*
* Filter '\n', '\r', "%0D" and "%0A" from the authority part of an FTP url.
* This helps to avoid a SMTP relaying hack. This filtering could be done
* only when port == 25, but if the mail server is listening on another
* port it wouldn't work.
* Note: AFAIS this should be done by wget.
*/
char *Filter_smtp_hack(char *url)
{
int i;
char c;
if (strlen(url) > 6) { /* ftp:// */
for (i = 6; (c = url[i]) && c != '/'; ++i) {
if (c == '\n' || c == '\r') {
memmove(url + i, url + i + 1, strlen(url + i));
--i;
} else if (c == '%' && url[i+1] == '0' &&
(tolower(url[i+2]) == 'a' || tolower(url[i+2]) == 'd')) {
memmove(url + i, url + i + 3, strlen(url + i + 2));
--i;
}
}
}
return url;
}
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