1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
9: *
10: * This software is licensed as described in the file COPYING, which
11: * you should have received as part of this distribution. The terms
12: * are also available at https://curl.haxx.se/docs/copyright.html.
13: *
14: * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15: * copies of the Software, and permit persons to whom the Software is
16: * furnished to do so, under the terms of the COPYING file.
17: *
18: * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19: * KIND, either express or implied.
20: *
21: ***************************************************************************/
22:
23: /* Escape and unescape URL encoding in strings. The functions return a new
24: * allocated string or NULL if an error occurred. */
25:
26: #include "curl_setup.h"
27:
28: #include <curl/curl.h>
29:
30: #include "urldata.h"
31: #include "warnless.h"
32: #include "non-ascii.h"
33: #include "escape.h"
34: #include "strdup.h"
35: /* The last 3 #include files should be in this order */
36: #include "curl_printf.h"
37: #include "curl_memory.h"
38: #include "memdebug.h"
39:
40: /* Portable character check (remember EBCDIC). Do not use isalnum() because
41: its behavior is altered by the current locale.
42: See https://tools.ietf.org/html/rfc3986#section-2.3
43: */
44: bool Curl_isunreserved(unsigned char in)
45: {
46: switch(in) {
47: case '0': case '1': case '2': case '3': case '4':
48: case '5': case '6': case '7': case '8': case '9':
49: case 'a': case 'b': case 'c': case 'd': case 'e':
50: case 'f': case 'g': case 'h': case 'i': case 'j':
51: case 'k': case 'l': case 'm': case 'n': case 'o':
52: case 'p': case 'q': case 'r': case 's': case 't':
53: case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
54: case 'A': case 'B': case 'C': case 'D': case 'E':
55: case 'F': case 'G': case 'H': case 'I': case 'J':
56: case 'K': case 'L': case 'M': case 'N': case 'O':
57: case 'P': case 'Q': case 'R': case 'S': case 'T':
58: case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
59: case '-': case '.': case '_': case '~':
60: return TRUE;
61: default:
62: break;
63: }
64: return FALSE;
65: }
66:
67: /* for ABI-compatibility with previous versions */
68: char *curl_escape(const char *string, int inlength)
69: {
70: return curl_easy_escape(NULL, string, inlength);
71: }
72:
73: /* for ABI-compatibility with previous versions */
74: char *curl_unescape(const char *string, int length)
75: {
76: return curl_easy_unescape(NULL, string, length, NULL);
77: }
78:
79: char *curl_easy_escape(struct Curl_easy *data, const char *string,
80: int inlength)
81: {
82: size_t alloc;
83: char *ns;
84: char *testing_ptr = NULL;
85: size_t newlen;
86: size_t strindex = 0;
87: size_t length;
88: CURLcode result;
89:
90: if(inlength < 0)
91: return NULL;
92:
93: alloc = (inlength?(size_t)inlength:strlen(string)) + 1;
94: newlen = alloc;
95:
96: ns = malloc(alloc);
97: if(!ns)
98: return NULL;
99:
100: length = alloc-1;
101: while(length--) {
102: unsigned char in = *string; /* we need to treat the characters unsigned */
103:
104: if(Curl_isunreserved(in))
105: /* just copy this */
106: ns[strindex++] = in;
107: else {
108: /* encode it */
109: newlen += 2; /* the size grows with two, since this'll become a %XX */
110: if(newlen > alloc) {
111: alloc *= 2;
112: testing_ptr = Curl_saferealloc(ns, alloc);
113: if(!testing_ptr)
114: return NULL;
115: ns = testing_ptr;
116: }
117:
118: result = Curl_convert_to_network(data, (char *)&in, 1);
119: if(result) {
120: /* Curl_convert_to_network calls failf if unsuccessful */
121: free(ns);
122: return NULL;
123: }
124:
125: msnprintf(&ns[strindex], 4, "%%%02X", in);
126:
127: strindex += 3;
128: }
129: string++;
130: }
131: ns[strindex] = 0; /* terminate it */
132: return ns;
133: }
134:
135: /*
136: * Curl_urldecode() URL decodes the given string.
137: *
138: * Optionally detects control characters (byte codes lower than 32) in the
139: * data and rejects such data.
140: *
141: * Returns a pointer to a malloced string in *ostring with length given in
142: * *olen. If length == 0, the length is assumed to be strlen(string).
143: *
144: * 'data' can be set to NULL but then this function can't convert network
145: * data to host for non-ascii.
146: */
147: CURLcode Curl_urldecode(struct Curl_easy *data,
148: const char *string, size_t length,
149: char **ostring, size_t *olen,
150: bool reject_ctrl)
151: {
152: size_t alloc = (length?length:strlen(string)) + 1;
153: char *ns = malloc(alloc);
154: size_t strindex = 0;
155: unsigned long hex;
156: CURLcode result = CURLE_OK;
157:
158: if(!ns)
159: return CURLE_OUT_OF_MEMORY;
160:
161: while(--alloc > 0) {
162: unsigned char in = *string;
163: if(('%' == in) && (alloc > 2) &&
164: ISXDIGIT(string[1]) && ISXDIGIT(string[2])) {
165: /* this is two hexadecimal digits following a '%' */
166: char hexstr[3];
167: char *ptr;
168: hexstr[0] = string[1];
169: hexstr[1] = string[2];
170: hexstr[2] = 0;
171:
172: hex = strtoul(hexstr, &ptr, 16);
173:
174: in = curlx_ultouc(hex); /* this long is never bigger than 255 anyway */
175:
176: if(data) {
177: result = Curl_convert_from_network(data, (char *)&in, 1);
178: if(result) {
179: /* Curl_convert_from_network calls failf if unsuccessful */
180: free(ns);
181: return result;
182: }
183: }
184:
185: string += 2;
186: alloc -= 2;
187: }
188:
189: if(reject_ctrl && (in < 0x20)) {
190: free(ns);
191: return CURLE_URL_MALFORMAT;
192: }
193:
194: ns[strindex++] = in;
195: string++;
196: }
197: ns[strindex] = 0; /* terminate it */
198:
199: if(olen)
200: /* store output size */
201: *olen = strindex;
202:
203: /* store output string */
204: *ostring = ns;
205:
206: return CURLE_OK;
207: }
208:
209: /*
210: * Unescapes the given URL escaped string of given length. Returns a
211: * pointer to a malloced string with length given in *olen.
212: * If length == 0, the length is assumed to be strlen(string).
213: * If olen == NULL, no output length is stored.
214: */
215: char *curl_easy_unescape(struct Curl_easy *data, const char *string,
216: int length, int *olen)
217: {
218: char *str = NULL;
219: if(length >= 0) {
220: size_t inputlen = length;
221: size_t outputlen;
222: CURLcode res = Curl_urldecode(data, string, inputlen, &str, &outputlen,
223: FALSE);
224: if(res)
225: return NULL;
226:
227: if(olen) {
228: if(outputlen <= (size_t) INT_MAX)
229: *olen = curlx_uztosi(outputlen);
230: else
231: /* too large to return in an int, fail! */
232: Curl_safefree(str);
233: }
234: }
235: return str;
236: }
237:
238: /* For operating systems/environments that use different malloc/free
239: systems for the app and for this library, we provide a free that uses
240: the library's memory system */
241: void curl_free(void *p)
242: {
243: free(p);
244: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to escape.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / curl / lib