1: /*************************************************************************
2: * (C) 2012 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
6: * $Id: tools.c,v 1.3.2.2 2012/08/06 11:26:23 misho Exp $
7: *
8: **************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
46: #include "global.h"
47:
48:
49: /*
50: * www_cmp() - Compare two string
51: *
52: * @ct = content text from www
53: * @s = string
54: * return: 0 are equal or !0 are different
55: */
56: int
57: www_cmp(const char *ct, const char *s)
58: {
59: char *sc;
60:
61: assert(ct && s);
62:
63: while (isspace((int) *ct))
64: ct++;
65:
66: if (!(sc = strchr(ct, ';')))
67: sc = strchr(ct, '\x0');
68: while (isspace((int) *(sc - 1)))
69: sc--;
70:
71: if (strlen(s) != sc - ct)
72: return -1;
73: return strncasecmp(ct, s, sc - ct);
74: }
75:
76: /*
77: * www_cmptype() - Compare context type
78: *
79: * @ct = content text from www
80: * @type = content type
81: * return: 0 are equal or !0 are different
82: */
83: int
84: www_cmptype(const char *ct, const char *type)
85: {
86: char *sl;
87:
88: assert(ct && type);
89:
90: while (isspace((int) *ct))
91: ct++;
92:
93: if (!(sl = strchr(ct, '/')))
94: return -1;
95:
96: if (strlen(type) != sl - ct)
97: return 1;
98: return strncasecmp(ct, type, sl - ct);
99: }
100:
101: /*
102: * www_getpair() - Get AV pair from WWW query string
103: *
104: * @str = query string
105: * @delim = delimiter
106: * return: NULL error or AV pair, must be io_free() after use!
107: */
108: ait_val_t *
109: www_getpair(char ** __restrict str, const char *delim)
110: {
111: char *tr;
112: int cx;
113: ait_val_t *s;
114:
115: assert(str && *str && delim);
116:
117: s = io_allocVar();
118: if (!s) {
119: www_SetErr(io_GetErrno(), "%s", io_GetError());
120: return NULL;
121: }
122:
123: cx = strcspn(*str, delim);
124: tr = *str + cx;
125: if (*tr)
126: *tr++ = 0;
127:
128: AIT_SET_STR(s, *str);
129:
130: *str = tr;
131: return s;
132: }
133:
134: /*
135: * www_x2c() - Hex from string to digit
136: *
137: * @str = string
138: * return: digit
139: */
140: inline char
141: www_x2c(const char *str)
142: {
143: register char digit;
144:
145: assert(str);
146:
147: digit = (str[0] >= 'A' ? ((str[0] & 0xdf) - 'A') + 10 : (str[0] - '0'));
148: digit *= 16;
149: digit += (str[1] >= 'A' ? ((str[1] & 0xdf) - 'A') + 10 : (str[1] - '0'));
150:
151: return digit;
152: }
153:
154: /*
155: * www_unescape() - Unescape/decode WWW query string to host string
156: *
157: * @str = string
158: * return: none
159: */
160: inline void
161: www_unescape(char * __restrict str)
162: {
163: register int i, j;
164:
165: if (!str)
166: return;
167:
168: for (i = j = 0; str[j]; i++, j++) {
169: str[i] = str[j];
170:
171: if (str[j] == '+')
172: str[i] = ' ';
173: else if (str[j] == '%') {
174: str[i] = www_x2c(&str[j + 1]);
175: j += 2;
176: }
177: }
178:
179: str[i] = 0;
180: }
181:
182: /*
183: * www_undot() - Undotted and clean WWW query filename
184: *
185: * @fname = query filename
186: * @fnlen = filename length
187: * return: -1 error, 0 not valid filename or >0 validated filename length
188: */
189: int
190: www_undot(const char * __restrict fname, int fnlen)
191: {
192: char *s, *s2;
193: int l;
194:
195: if (!fname || !fnlen)
196: return -1;
197:
198: /* collapse / sequences */
199: if ((s = strstr(fname, "//"))) {
200: s2 = s + 1;
201: for (s2 = ++s; *s2 == '/'; s2++);
202: memmove(s, s2, strlen(s2) + 1);
203: }
204:
205: /* escaped ./ and /./ sequences */
206: while (!strncmp(fname, "./", 2))
207: memmove((void*) fname, fname + 2, strlen(fname + 1));
208: while ((s = strstr(fname, "/./")))
209: memmove(s, s + 2, strlen(s + 1));
210:
211: /* alternate between removing leading ../ and removing xxx/../ */
212: while (42) {
213: while (!strncmp(fname, "../", 3))
214: memmove((void*) fname, fname + 3, strlen(fname + 2));
215: if (!(s = strstr(fname, "/../")))
216: break;
217: for (s2 = s - 1; s2 >= fname && *s2 != '/'; --s2);
218: memmove(s2 + 1, s + 4, strlen(s + 3));
219: }
220:
221: /* elide any /.. at the end */
222: while ((l = strlen(fname)) > 3 &&
223: !strcmp((s = (char*) fname + l - 3), "/..")) {
224: for (s2 = s - 1; s2 >= fname && *s2 != '/'; --s2);
225: if (s2 < fname)
226: break;
227: *s2 = 0;
228: }
229:
230: /* if filename is empry add current dir */
231: if (!*fname)
232: strlcpy((char*) fname, "./", fnlen);
233:
234: /* check for valid filename */
235: if (*fname == '/' || (fname[0] == '.' && fname[1] == '.' &&
236: (!fname[2] || fname[2] == '/')))
237: return 0;
238:
239: return strlen(fname);
240: }
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