b6c463eabc
RFC 1738 specifies that any ":", "@", or "/" within a user name or password in a URL is percent-encoded, to avoid ambiguity with the use of those characters as URL component separators. Reviewed by: rstone@ MFC after: 1 month
470 lines
11 KiB
C
470 lines
11 KiB
C
/*-
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* Copyright (c) 1998-2004 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "fetch.h"
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#include "common.h"
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auth_t fetchAuthMethod;
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int fetchLastErrCode;
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char fetchLastErrString[MAXERRSTRING];
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int fetchTimeout;
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int fetchRestartCalls = 1;
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int fetchDebug;
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/*** Local data **************************************************************/
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/*
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* Error messages for parser errors
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*/
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#define URL_MALFORMED 1
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#define URL_BAD_SCHEME 2
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#define URL_BAD_PORT 3
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static struct fetcherr url_errlist[] = {
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{ URL_MALFORMED, FETCH_URL, "Malformed URL" },
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{ URL_BAD_SCHEME, FETCH_URL, "Invalid URL scheme" },
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{ URL_BAD_PORT, FETCH_URL, "Invalid server port" },
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{ -1, FETCH_UNKNOWN, "Unknown parser error" }
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};
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/*** Public API **************************************************************/
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/*
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* Select the appropriate protocol for the URL scheme, and return a
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* read-only stream connected to the document referenced by the URL.
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* Also fill out the struct url_stat.
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*/
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FILE *
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fetchXGet(struct url *URL, struct url_stat *us, const char *flags)
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{
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if (us != NULL) {
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us->size = -1;
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us->atime = us->mtime = 0;
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}
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if (strcasecmp(URL->scheme, SCHEME_FILE) == 0)
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return (fetchXGetFile(URL, us, flags));
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else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0)
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return (fetchXGetFTP(URL, us, flags));
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else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0)
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return (fetchXGetHTTP(URL, us, flags));
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else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0)
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return (fetchXGetHTTP(URL, us, flags));
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url_seterr(URL_BAD_SCHEME);
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return (NULL);
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}
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/*
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* Select the appropriate protocol for the URL scheme, and return a
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* read-only stream connected to the document referenced by the URL.
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*/
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FILE *
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fetchGet(struct url *URL, const char *flags)
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{
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return (fetchXGet(URL, NULL, flags));
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}
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/*
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* Select the appropriate protocol for the URL scheme, and return a
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* write-only stream connected to the document referenced by the URL.
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*/
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FILE *
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fetchPut(struct url *URL, const char *flags)
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{
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if (strcasecmp(URL->scheme, SCHEME_FILE) == 0)
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return (fetchPutFile(URL, flags));
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else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0)
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return (fetchPutFTP(URL, flags));
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else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0)
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return (fetchPutHTTP(URL, flags));
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else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0)
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return (fetchPutHTTP(URL, flags));
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url_seterr(URL_BAD_SCHEME);
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return (NULL);
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}
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/*
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* Select the appropriate protocol for the URL scheme, and return the
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* size of the document referenced by the URL if it exists.
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*/
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int
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fetchStat(struct url *URL, struct url_stat *us, const char *flags)
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{
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if (us != NULL) {
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us->size = -1;
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us->atime = us->mtime = 0;
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}
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if (strcasecmp(URL->scheme, SCHEME_FILE) == 0)
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return (fetchStatFile(URL, us, flags));
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else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0)
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return (fetchStatFTP(URL, us, flags));
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else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0)
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return (fetchStatHTTP(URL, us, flags));
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else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0)
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return (fetchStatHTTP(URL, us, flags));
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url_seterr(URL_BAD_SCHEME);
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return (-1);
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}
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/*
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* Select the appropriate protocol for the URL scheme, and return a
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* list of files in the directory pointed to by the URL.
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*/
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struct url_ent *
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fetchList(struct url *URL, const char *flags)
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{
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if (strcasecmp(URL->scheme, SCHEME_FILE) == 0)
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return (fetchListFile(URL, flags));
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else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0)
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return (fetchListFTP(URL, flags));
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else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0)
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return (fetchListHTTP(URL, flags));
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else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0)
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return (fetchListHTTP(URL, flags));
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url_seterr(URL_BAD_SCHEME);
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return (NULL);
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}
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/*
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* Attempt to parse the given URL; if successful, call fetchXGet().
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*/
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FILE *
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fetchXGetURL(const char *URL, struct url_stat *us, const char *flags)
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{
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struct url *u;
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FILE *f;
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if ((u = fetchParseURL(URL)) == NULL)
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return (NULL);
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f = fetchXGet(u, us, flags);
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fetchFreeURL(u);
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return (f);
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}
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/*
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* Attempt to parse the given URL; if successful, call fetchGet().
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*/
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FILE *
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fetchGetURL(const char *URL, const char *flags)
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{
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return (fetchXGetURL(URL, NULL, flags));
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}
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/*
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* Attempt to parse the given URL; if successful, call fetchPut().
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*/
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FILE *
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fetchPutURL(const char *URL, const char *flags)
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{
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struct url *u;
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FILE *f;
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if ((u = fetchParseURL(URL)) == NULL)
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return (NULL);
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f = fetchPut(u, flags);
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fetchFreeURL(u);
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return (f);
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}
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/*
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* Attempt to parse the given URL; if successful, call fetchStat().
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*/
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int
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fetchStatURL(const char *URL, struct url_stat *us, const char *flags)
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{
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struct url *u;
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int s;
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if ((u = fetchParseURL(URL)) == NULL)
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return (-1);
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s = fetchStat(u, us, flags);
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fetchFreeURL(u);
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return (s);
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}
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/*
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* Attempt to parse the given URL; if successful, call fetchList().
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*/
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struct url_ent *
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fetchListURL(const char *URL, const char *flags)
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{
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struct url *u;
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struct url_ent *ue;
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if ((u = fetchParseURL(URL)) == NULL)
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return (NULL);
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ue = fetchList(u, flags);
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fetchFreeURL(u);
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return (ue);
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}
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/*
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* Make a URL
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*/
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struct url *
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fetchMakeURL(const char *scheme, const char *host, int port, const char *doc,
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const char *user, const char *pwd)
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{
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struct url *u;
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if (!scheme || (!host && !doc)) {
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url_seterr(URL_MALFORMED);
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return (NULL);
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}
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if (port < 0 || port > 65535) {
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url_seterr(URL_BAD_PORT);
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return (NULL);
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}
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/* allocate struct url */
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if ((u = calloc(1, sizeof(*u))) == NULL) {
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fetch_syserr();
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return (NULL);
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}
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if ((u->doc = strdup(doc ? doc : "/")) == NULL) {
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fetch_syserr();
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free(u);
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return (NULL);
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}
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#define seturl(x) snprintf(u->x, sizeof(u->x), "%s", x)
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seturl(scheme);
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seturl(host);
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seturl(user);
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seturl(pwd);
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#undef seturl
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u->port = port;
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return (u);
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}
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/*
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* Return value of the given hex digit.
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*/
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static int
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fetch_hexval(char ch)
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{
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if (ch >= '0' && ch <= '9')
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return (ch - '0');
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else if (ch >= 'a' && ch <= 'f')
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return (ch - 'a' + 10);
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else if (ch >= 'A' && ch <= 'F')
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return (ch - 'A' + 10);
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return (-1);
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}
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/*
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* Decode percent-encoded URL component from src into dst, stopping at end
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* of string, or at @ or : separators. Returns a pointer to the unhandled
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* part of the input string (null terminator, @, or :). No terminator is
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* written to dst (it is the caller's responsibility).
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*/
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static const char *
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fetch_pctdecode(char *dst, const char *src, size_t dlen)
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{
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int d1, d2;
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char c;
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const char *s;
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for (s = src; *s != '\0' && *s != '@' && *s != ':'; s++) {
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if (s[0] == '%' && (d1 = fetch_hexval(s[1])) >= 0 &&
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(d2 = fetch_hexval(s[2])) >= 0 && (d1 > 0 || d2 > 0)) {
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c = d1 << 4 | d2;
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s += 2;
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} else {
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c = *s;
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}
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if (dlen-- > 0)
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*dst++ = c;
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}
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return (s);
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}
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/*
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* Split an URL into components. URL syntax is:
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* [method:/][/[user[:pwd]@]host[:port]/][document]
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* This almost, but not quite, RFC1738 URL syntax.
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*/
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struct url *
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fetchParseURL(const char *URL)
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{
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char *doc;
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const char *p, *q;
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struct url *u;
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int i;
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/* allocate struct url */
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if ((u = calloc(1, sizeof(*u))) == NULL) {
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fetch_syserr();
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return (NULL);
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}
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/* scheme name */
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if ((p = strstr(URL, ":/"))) {
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snprintf(u->scheme, URL_SCHEMELEN+1,
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"%.*s", (int)(p - URL), URL);
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URL = ++p;
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/*
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* Only one slash: no host, leave slash as part of document
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* Two slashes: host follows, strip slashes
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*/
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if (URL[1] == '/')
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URL = (p += 2);
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} else {
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p = URL;
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}
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if (!*URL || *URL == '/' || *URL == '.' ||
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(u->scheme[0] == '\0' &&
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strchr(URL, '/') == NULL && strchr(URL, ':') == NULL))
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goto nohost;
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p = strpbrk(URL, "/@");
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if (p && *p == '@') {
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/* username */
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q = fetch_pctdecode(u->user, URL, URL_USERLEN);
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/* password */
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if (*q == ':')
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q = fetch_pctdecode(u->pwd, ++q, URL_PWDLEN);
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p++;
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} else {
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p = URL;
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}
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/* hostname */
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#ifdef INET6
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if (*p == '[' && (q = strchr(p + 1, ']')) != NULL &&
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(*++q == '\0' || *q == '/' || *q == ':')) {
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if ((i = q - p - 2) > MAXHOSTNAMELEN)
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i = MAXHOSTNAMELEN;
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strncpy(u->host, ++p, i);
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p = q;
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} else
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#endif
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for (i = 0; *p && (*p != '/') && (*p != ':'); p++)
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if (i < MAXHOSTNAMELEN)
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u->host[i++] = *p;
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/* port */
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if (*p == ':') {
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for (q = ++p; *q && (*q != '/'); q++)
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if (isdigit((unsigned char)*q))
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u->port = u->port * 10 + (*q - '0');
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else {
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/* invalid port */
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url_seterr(URL_BAD_PORT);
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goto ouch;
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}
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p = q;
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}
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nohost:
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/* document */
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if (!*p)
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p = "/";
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if (strcasecmp(u->scheme, SCHEME_HTTP) == 0 ||
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strcasecmp(u->scheme, SCHEME_HTTPS) == 0) {
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const char hexnums[] = "0123456789abcdef";
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/* percent-escape whitespace. */
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if ((doc = malloc(strlen(p) * 3 + 1)) == NULL) {
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fetch_syserr();
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goto ouch;
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}
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u->doc = doc;
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while (*p != '\0') {
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if (!isspace((unsigned char)*p)) {
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*doc++ = *p++;
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} else {
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*doc++ = '%';
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*doc++ = hexnums[((unsigned int)*p) >> 4];
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*doc++ = hexnums[((unsigned int)*p) & 0xf];
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p++;
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}
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}
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*doc = '\0';
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} else if ((u->doc = strdup(p)) == NULL) {
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fetch_syserr();
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goto ouch;
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}
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DEBUG(fprintf(stderr,
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"scheme: [%s]\n"
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"user: [%s]\n"
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"password: [%s]\n"
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"host: [%s]\n"
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"port: [%d]\n"
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"document: [%s]\n",
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u->scheme, u->user, u->pwd,
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u->host, u->port, u->doc));
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return (u);
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ouch:
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free(u);
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return (NULL);
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}
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/*
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* Free a URL
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*/
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void
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fetchFreeURL(struct url *u)
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{
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free(u->doc);
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free(u);
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}
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