fetch.c revision 40939 
1/*-
2 * Copyright (c) 1998 Dag-Erling Co�dan Sm�rgrav
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 *	$Id: fetch.c,v 1.4 1998/08/17 09:30:19 des Exp $
29 */
30
31#include <sys/param.h>
32
33#include <ctype.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37
38#include "fetch.h"
39
40#ifndef NDEBUG
41#define DEBUG(x) do x; while (0)
42#else
43#define DEBUG(x) do { } while (0)
44#endif
45
46int fetchLastErrCode;
47const char *fetchLastErrText;
48
49/*
50 * Select the appropriate protocol for the URL scheme, and return a
51 * read-only stream connected to the document referenced by the URL.
52 */
53FILE *
54fetchGet(url_t *URL, char *flags)
55{
56    if (strcasecmp(URL->scheme, "file") == 0)
57	return fetchGetFile(URL, flags);
58    else if (strcasecmp(URL->scheme, "http") == 0)
59	return fetchGetHTTP(URL, flags);
60    else if (strcasecmp(URL->scheme, "ftp") == 0)
61	return fetchGetFTP(URL, flags);
62    else return NULL;
63
64}
65
66/*
67 * Select the appropriate protocol for the URL scheme, and return a
68 * write-only stream connected to the document referenced by the URL.
69 */
70FILE *
71fetchPut(url_t *URL, char *flags)
72{
73    if (strcasecmp(URL->scheme, "file") == 0)
74	return fetchPutFile(URL, flags);
75    else if (strcasecmp(URL->scheme, "http") == 0)
76	return fetchPutHTTP(URL, flags);
77    else if (strcasecmp(URL->scheme, "ftp") == 0)
78	return fetchPutFTP(URL, flags);
79    else return NULL;
80}
81
82/*
83 * Attempt to parse the given URL; if successful, call fetchGet().
84 */
85FILE *
86fetchGetURL(char *URL, char *flags)
87{
88    url_t *u;
89    FILE *f;
90
91    if ((u = fetchParseURL(URL)) == NULL)
92	return NULL;
93
94    f = fetchGet(u, flags);
95
96    free(u);
97    return f;
98}
99
100
101/*
102 * Attempt to parse the given URL; if successful, call fetchPut().
103 */
104FILE *
105fetchPutURL(char *URL, char *flags)
106{
107    url_t *u;
108    FILE *f;
109
110    if ((u = fetchParseURL(URL)) == NULL)
111	return NULL;
112
113    f = fetchPut(u, flags);
114
115    free(u);
116    return f;
117}
118
119/*
120 * Split an URL into components. URL syntax is:
121 * method:[//[user[:pwd]@]host[:port]]/[document]
122 * This almost, but not quite, RFC1738 URL syntax.
123 */
124url_t *
125fetchParseURL(char *URL)
126{
127    char *p, *q;
128    url_t *u;
129    int i;
130
131    /* allocate url_t */
132    if ((u = calloc(1, sizeof(url_t))) == NULL)
133	return NULL;
134
135    /* scheme name */
136    for (i = 0; *URL && (*URL != ':'); URL++)
137	if (i < URL_SCHEMELEN)
138	    u->scheme[i++] = *URL;
139    if (!URL[0] || (URL[1] != '/'))
140	goto ouch;
141    else URL++;
142    if (URL[1] != '/') {
143	p = URL;
144	goto nohost;
145    }
146    else URL += 2;
147
148    p = strpbrk(URL, "/@");
149    if (*p == '@') {
150	/* username */
151	for (q = URL, i = 0; (*q != ':') && (*q != '@'); q++)
152	    if (i < URL_USERLEN)
153		u->user[i++] = *q;
154
155	/* password */
156	if (*q == ':')
157	    for (q++, i = 0; (*q != ':') && (*q != '@'); q++)
158		if (i < URL_PWDLEN)
159		    u->pwd[i++] = *q;
160
161	p++;
162    } else p = URL;
163
164    /* hostname */
165    for (i = 0; *p && (*p != '/') && (*p != ':'); p++)
166	if (i < MAXHOSTNAMELEN)
167	    u->host[i++] = *p;
168
169    /* port */
170    if (*p == ':') {
171	for (q = ++p; *q && (*q != '/'); q++)
172	    if (isdigit(*q))
173		u->port = u->port * 10 + (*q - '0');
174	    else return 0; /* invalid port */
175	while (*p && (*p != '/'))
176	    p++;
177    }
178
179nohost:
180    /* document */
181    if (*p) {
182	url_t *t;
183	t = realloc(u, sizeof(*u)+strlen(p)-1);
184	if (t == NULL)
185	    goto ouch;
186	u = t;
187	strcpy(u->doc, p);
188    } else {
189	u->doc[0] = '/';
190	u->doc[1] = 0;
191    }
192
193    DEBUG(fprintf(stderr,
194		  "scheme:   [\033[1m%s\033[m]\n"
195		  "user:     [\033[1m%s\033[m]\n"
196		  "password: [\033[1m%s\033[m]\n"
197		  "host:     [\033[1m%s\033[m]\n"
198		  "port:     [\033[1m%d\033[m]\n"
199		  "document: [\033[1m%s\033[m]\n",
200		  u->scheme, u->user, u->pwd,
201		  u->host, u->port, u->doc));
202
203    return u;
204
205ouch:
206    free(u);
207    return NULL;
208}
209