247 lines
6.9 KiB
C
247 lines
6.9 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/* Escape and unescape URL encoding in strings. The functions return a new
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* allocated string or NULL if an error occurred. */
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#include "curl_setup.h"
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#include <curl/curl.h>
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#include "urldata.h"
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#include "warnless.h"
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#include "non-ascii.h"
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#include "escape.h"
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#include "strdup.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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/* Portable character check (remember EBCDIC). Do not use isalnum() because
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its behavior is altered by the current locale.
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See https://tools.ietf.org/html/rfc3986#section-2.3
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*/
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bool Curl_isunreserved(unsigned char in)
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{
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switch(in) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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case 'a': case 'b': case 'c': case 'd': case 'e':
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case 'f': case 'g': case 'h': case 'i': case 'j':
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case 'k': case 'l': case 'm': case 'n': case 'o':
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case 'p': case 'q': case 'r': case 's': case 't':
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case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
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case 'A': case 'B': case 'C': case 'D': case 'E':
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case 'F': case 'G': case 'H': case 'I': case 'J':
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case 'K': case 'L': case 'M': case 'N': case 'O':
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case 'P': case 'Q': case 'R': case 'S': case 'T':
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case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
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case '-': case '.': case '_': case '~':
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return TRUE;
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default:
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break;
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}
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return FALSE;
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}
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/* for ABI-compatibility with previous versions */
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char *curl_escape(const char *string, int inlength)
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{
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return curl_easy_escape(NULL, string, inlength);
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}
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/* for ABI-compatibility with previous versions */
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char *curl_unescape(const char *string, int length)
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{
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return curl_easy_unescape(NULL, string, length, NULL);
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}
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char *curl_easy_escape(struct Curl_easy *data, const char *string,
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int inlength)
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{
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size_t length;
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CURLcode result;
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struct dynbuf d;
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if(inlength < 0)
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return NULL;
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Curl_dyn_init(&d, CURL_MAX_INPUT_LENGTH * 3);
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length = (inlength?(size_t)inlength:strlen(string));
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if(!length)
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return strdup("");
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while(length--) {
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unsigned char in = *string; /* we need to treat the characters unsigned */
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if(Curl_isunreserved(in)) {
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/* append this */
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if(Curl_dyn_addn(&d, &in, 1))
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return NULL;
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}
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else {
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/* encode it */
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char encoded[4];
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result = Curl_convert_to_network(data, (char *)&in, 1);
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if(result) {
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/* Curl_convert_to_network calls failf if unsuccessful */
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Curl_dyn_free(&d);
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return NULL;
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}
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msnprintf(encoded, sizeof(encoded), "%%%02X", in);
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if(Curl_dyn_add(&d, encoded))
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return NULL;
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}
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string++;
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}
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return Curl_dyn_ptr(&d);
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}
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/*
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* Curl_urldecode() URL decodes the given string.
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*
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* Returns a pointer to a malloced string in *ostring with length given in
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* *olen. If length == 0, the length is assumed to be strlen(string).
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*
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* 'data' can be set to NULL but then this function can't convert network
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* data to host for non-ascii.
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*
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* ctrl options:
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* - REJECT_NADA: accept everything
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* - REJECT_CTRL: rejects control characters (byte codes lower than 32) in
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* the data
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* - REJECT_ZERO: rejects decoded zero bytes
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*
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* The values for the enum starts at 2, to make the assert detect legacy
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* invokes that used TRUE/FALSE (0 and 1).
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*/
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CURLcode Curl_urldecode(struct Curl_easy *data,
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const char *string, size_t length,
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char **ostring, size_t *olen,
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enum urlreject ctrl)
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{
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size_t alloc;
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char *ns;
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size_t strindex = 0;
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unsigned long hex;
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CURLcode result = CURLE_OK;
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DEBUGASSERT(string);
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DEBUGASSERT(ctrl >= REJECT_NADA); /* crash on TRUE/FALSE */
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alloc = (length?length:strlen(string)) + 1;
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ns = malloc(alloc);
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if(!ns)
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return CURLE_OUT_OF_MEMORY;
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while(--alloc > 0) {
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unsigned char in = *string;
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if(('%' == in) && (alloc > 2) &&
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ISXDIGIT(string[1]) && ISXDIGIT(string[2])) {
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/* this is two hexadecimal digits following a '%' */
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char hexstr[3];
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char *ptr;
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hexstr[0] = string[1];
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hexstr[1] = string[2];
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hexstr[2] = 0;
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hex = strtoul(hexstr, &ptr, 16);
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in = curlx_ultouc(hex); /* this long is never bigger than 255 anyway */
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if(data) {
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result = Curl_convert_from_network(data, (char *)&in, 1);
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if(result) {
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/* Curl_convert_from_network calls failf if unsuccessful */
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free(ns);
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return result;
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}
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}
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string += 2;
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alloc -= 2;
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}
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if(((ctrl == REJECT_CTRL) && (in < 0x20)) ||
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((ctrl == REJECT_ZERO) && (in == 0))) {
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free(ns);
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return CURLE_URL_MALFORMAT;
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}
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ns[strindex++] = in;
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string++;
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}
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ns[strindex] = 0; /* terminate it */
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if(olen)
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/* store output size */
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*olen = strindex;
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/* store output string */
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*ostring = ns;
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return CURLE_OK;
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}
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/*
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* Unescapes the given URL escaped string of given length. Returns a
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* pointer to a malloced string with length given in *olen.
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* If length == 0, the length is assumed to be strlen(string).
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* If olen == NULL, no output length is stored.
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*/
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char *curl_easy_unescape(struct Curl_easy *data, const char *string,
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int length, int *olen)
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{
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char *str = NULL;
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if(length >= 0) {
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size_t inputlen = length;
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size_t outputlen;
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CURLcode res = Curl_urldecode(data, string, inputlen, &str, &outputlen,
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REJECT_NADA);
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if(res)
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return NULL;
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if(olen) {
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if(outputlen <= (size_t) INT_MAX)
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*olen = curlx_uztosi(outputlen);
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else
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/* too large to return in an int, fail! */
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Curl_safefree(str);
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}
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}
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return str;
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}
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/* For operating systems/environments that use different malloc/free
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systems for the app and for this library, we provide a free that uses
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the library's memory system */
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void curl_free(void *p)
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{
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free(p);
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}
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