added basic structure

1 files changed, 469 insertions, 0 deletions

diff --git a/libfetch/fetch.c b/libfetch/fetch.c
new file mode 100644
index 0000000..a081520
--- /dev/null
+++ b/libfetch/fetch.c
@@ -0,0 +1,469 @@
+/*-
+ * Copyright (c) 1998-2004 Dag-Erling Smørgrav
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/errno.h>
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "fetch.h"
+#include "common.h"
+
+auth_t	 fetchAuthMethod;
+int	 fetchLastErrCode;
+char	 fetchLastErrString[MAXERRSTRING];
+int	 fetchTimeout;
+int	 fetchRestartCalls = 1;
+int	 fetchDebug;
+
+
+/*** Local data **************************************************************/
+
+/*
+ * Error messages for parser errors
+ */
+#define URL_MALFORMED		1
+#define URL_BAD_SCHEME		2
+#define URL_BAD_PORT		3
+static struct fetcherr url_errlist[] = {
+	{ URL_MALFORMED,	FETCH_URL,	"Malformed URL" },
+	{ URL_BAD_SCHEME,	FETCH_URL,	"Invalid URL scheme" },
+	{ URL_BAD_PORT,		FETCH_URL,	"Invalid server port" },
+	{ -1,			FETCH_UNKNOWN,	"Unknown parser error" }
+};
+
+
+/*** Public API **************************************************************/
+
+/*
+ * Select the appropriate protocol for the URL scheme, and return a
+ * read-only stream connected to the document referenced by the URL.
+ * Also fill out the struct url_stat.
+ */
+FILE *
+fetchXGet(struct url *URL, struct url_stat *us, const char *flags)
+{
+
+	if (us != NULL) {
+		us->size = -1;
+		us->atime = us->mtime = 0;
+	}
+	if (strcasecmp(URL->scheme, SCHEME_FILE) == 0)
+		return (fetchXGetFile(URL, us, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0)
+		return (fetchXGetFTP(URL, us, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0)
+		return (fetchXGetHTTP(URL, us, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0)
+		return (fetchXGetHTTP(URL, us, flags));
+	url_seterr(URL_BAD_SCHEME);
+	return (NULL);
+}
+
+/*
+ * Select the appropriate protocol for the URL scheme, and return a
+ * read-only stream connected to the document referenced by the URL.
+ */
+FILE *
+fetchGet(struct url *URL, const char *flags)
+{
+	return (fetchXGet(URL, NULL, flags));
+}
+
+/*
+ * Select the appropriate protocol for the URL scheme, and return a
+ * write-only stream connected to the document referenced by the URL.
+ */
+FILE *
+fetchPut(struct url *URL, const char *flags)
+{
+
+	if (strcasecmp(URL->scheme, SCHEME_FILE) == 0)
+		return (fetchPutFile(URL, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0)
+		return (fetchPutFTP(URL, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0)
+		return (fetchPutHTTP(URL, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0)
+		return (fetchPutHTTP(URL, flags));
+	url_seterr(URL_BAD_SCHEME);
+	return (NULL);
+}
+
+/*
+ * Select the appropriate protocol for the URL scheme, and return the
+ * size of the document referenced by the URL if it exists.
+ */
+int
+fetchStat(struct url *URL, struct url_stat *us, const char *flags)
+{
+
+	if (us != NULL) {
+		us->size = -1;
+		us->atime = us->mtime = 0;
+	}
+	if (strcasecmp(URL->scheme, SCHEME_FILE) == 0)
+		return (fetchStatFile(URL, us, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0)
+		return (fetchStatFTP(URL, us, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0)
+		return (fetchStatHTTP(URL, us, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0)
+		return (fetchStatHTTP(URL, us, flags));
+	url_seterr(URL_BAD_SCHEME);
+	return (-1);
+}
+
+/*
+ * Select the appropriate protocol for the URL scheme, and return a
+ * list of files in the directory pointed to by the URL.
+ */
+struct url_ent *
+fetchList(struct url *URL, const char *flags)
+{
+
+	if (strcasecmp(URL->scheme, SCHEME_FILE) == 0)
+		return (fetchListFile(URL, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0)
+		return (fetchListFTP(URL, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0)
+		return (fetchListHTTP(URL, flags));
+	else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0)
+		return (fetchListHTTP(URL, flags));
+	url_seterr(URL_BAD_SCHEME);
+	return (NULL);
+}
+
+/*
+ * Attempt to parse the given URL; if successful, call fetchXGet().
+ */
+FILE *
+fetchXGetURL(const char *URL, struct url_stat *us, const char *flags)
+{
+	struct url *u;
+	FILE *f;
+
+	if ((u = fetchParseURL(URL)) == NULL)
+		return (NULL);
+
+	f = fetchXGet(u, us, flags);
+
+	fetchFreeURL(u);
+	return (f);
+}
+
+/*
+ * Attempt to parse the given URL; if successful, call fetchGet().
+ */
+FILE *
+fetchGetURL(const char *URL, const char *flags)
+{
+	return (fetchXGetURL(URL, NULL, flags));
+}
+
+/*
+ * Attempt to parse the given URL; if successful, call fetchPut().
+ */
+FILE *
+fetchPutURL(const char *URL, const char *flags)
+{
+	struct url *u;
+	FILE *f;
+
+	if ((u = fetchParseURL(URL)) == NULL)
+		return (NULL);
+
+	f = fetchPut(u, flags);
+
+	fetchFreeURL(u);
+	return (f);
+}
+
+/*
+ * Attempt to parse the given URL; if successful, call fetchStat().
+ */
+int
+fetchStatURL(const char *URL, struct url_stat *us, const char *flags)
+{
+	struct url *u;
+	int s;
+
+	if ((u = fetchParseURL(URL)) == NULL)
+		return (-1);
+
+	s = fetchStat(u, us, flags);
+
+	fetchFreeURL(u);
+	return (s);
+}
+
+/*
+ * Attempt to parse the given URL; if successful, call fetchList().
+ */
+struct url_ent *
+fetchListURL(const char *URL, const char *flags)
+{
+	struct url *u;
+	struct url_ent *ue;
+
+	if ((u = fetchParseURL(URL)) == NULL)
+		return (NULL);
+
+	ue = fetchList(u, flags);
+
+	fetchFreeURL(u);
+	return (ue);
+}
+
+/*
+ * Make a URL
+ */
+struct url *
+fetchMakeURL(const char *scheme, const char *host, int port, const char *doc,
+    const char *user, const char *pwd)
+{
+	struct url *u;
+
+	if (!scheme || (!host && !doc)) {
+		url_seterr(URL_MALFORMED);
+		return (NULL);
+	}
+
+	if (port < 0 || port > 65535) {
+		url_seterr(URL_BAD_PORT);
+		return (NULL);
+	}
+
+	/* allocate struct url */
+	if ((u = calloc(1, sizeof(*u))) == NULL) {
+		fetch_syserr();
+		return (NULL);
+	}
+
+	if ((u->doc = strdup(doc ? doc : "/")) == NULL) {
+		fetch_syserr();
+		free(u);
+		return (NULL);
+	}
+
+#define seturl(x) snprintf(u->x, sizeof(u->x), "%s", x)
+	seturl(scheme);
+	seturl(host);
+	seturl(user);
+	seturl(pwd);
+#undef seturl
+	u->port = port;
+
+	return (u);
+}
+
+/*
+ * Return value of the given hex digit.
+ */
+static int
+fetch_hexval(char ch)
+{
+
+	if (ch >= '0' && ch <= '9')
+		return (ch - '0');
+	else if (ch >= 'a' && ch <= 'f')
+		return (ch - 'a' + 10);
+	else if (ch >= 'A' && ch <= 'F')
+		return (ch - 'A' + 10);
+	return (-1);
+}
+
+/*
+ * Decode percent-encoded URL component from src into dst, stopping at end
+ * of string, or at @ or : separators.  Returns a pointer to the unhandled
+ * part of the input string (null terminator, @, or :).  No terminator is
+ * written to dst (it is the caller's responsibility).
+ */
+static const char *
+fetch_pctdecode(char *dst, const char *src, size_t dlen)
+{
+	int d1, d2;
+	char c;
+	const char *s;
+
+	for (s = src; *s != '\0' && *s != '@' && *s != ':'; s++) {
+		if (s[0] == '%' && (d1 = fetch_hexval(s[1])) >= 0 &&
+		    (d2 = fetch_hexval(s[2])) >= 0 && (d1 > 0 || d2 > 0)) {
+			c = d1 << 4 | d2;
+			s += 2;
+		} else {
+			c = *s;
+		}
+		if (dlen-- > 0)
+			*dst++ = c;
+	}
+	return (s);
+}
+
+/*
+ * Split an URL into components. URL syntax is:
+ * [method:/][/[user[:pwd]@]host[:port]/][document]
+ * This almost, but not quite, RFC1738 URL syntax.
+ */
+struct url *
+fetchParseURL(const char *URL)
+{
+	char *doc;
+	const char *p, *q;
+	struct url *u;
+	int i;
+
+	/* allocate struct url */
+	if ((u = calloc(1, sizeof(*u))) == NULL) {
+		fetch_syserr();
+		return (NULL);
+	}
+
+	/* scheme name */
+	if ((p = strstr(URL, ":/"))) {
+		snprintf(u->scheme, URL_SCHEMELEN+1,
+		    "%.*s", (int)(p - URL), URL);
+		URL = ++p;
+		/*
+		 * Only one slash: no host, leave slash as part of document
+		 * Two slashes: host follows, strip slashes
+		 */
+		if (URL[1] == '/')
+			URL = (p += 2);
+	} else {
+		p = URL;
+	}
+	if (!*URL || *URL == '/' || *URL == '.' ||
+	    (u->scheme[0] == '\0' &&
+		strchr(URL, '/') == NULL && strchr(URL, ':') == NULL))
+		goto nohost;
+
+	p = strpbrk(URL, "/@");
+	if (p && *p == '@') {
+		/* username */
+		q = fetch_pctdecode(u->user, URL, URL_USERLEN);
+
+		/* password */
+		if (*q == ':')
+			q = fetch_pctdecode(u->pwd, ++q, URL_PWDLEN);
+
+		p++;
+	} else {
+		p = URL;
+	}
+
+	/* hostname */
+#ifdef INET6
+	if (*p == '[' && (q = strchr(p + 1, ']')) != NULL &&
+	    (*++q == '\0' || *q == '/' || *q == ':')) {
+		if ((i = q - p - 2) > MAXHOSTNAMELEN)
+			i = MAXHOSTNAMELEN;
+		strncpy(u->host, ++p, i);
+		p = q;
+	} else
+#endif
+		for (i = 0; *p && (*p != '/') && (*p != ':'); p++)
+			if (i < MAXHOSTNAMELEN)
+				u->host[i++] = *p;
+
+	/* port */
+	if (*p == ':') {
+		for (q = ++p; *q && (*q != '/'); q++)
+			if (isdigit((unsigned char)*q))
+				u->port = u->port * 10 + (*q - '0');
+			else {
+				/* invalid port */
+				url_seterr(URL_BAD_PORT);
+				goto ouch;
+			}
+		p = q;
+	}
+
+nohost:
+	/* document */
+	if (!*p)
+		p = "/";
+
+	if (strcasecmp(u->scheme, SCHEME_HTTP) == 0 ||
+	    strcasecmp(u->scheme, SCHEME_HTTPS) == 0) {
+		const char hexnums[] = "0123456789abcdef";
+
+		/* percent-escape whitespace. */
+		if ((doc = malloc(strlen(p) * 3 + 1)) == NULL) {
+			fetch_syserr();
+			goto ouch;
+		}
+		u->doc = doc;
+		while (*p != '\0') {
+			if (!isspace((unsigned char)*p)) {
+				*doc++ = *p++;
+			} else {
+				*doc++ = '%';
+				*doc++ = hexnums[((unsigned int)*p) >> 4];
+				*doc++ = hexnums[((unsigned int)*p) & 0xf];
+				p++;
+			}
+		}
+		*doc = '\0';
+	} else if ((u->doc = strdup(p)) == NULL) {
+		fetch_syserr();
+		goto ouch;
+	}
+
+	DEBUG(fprintf(stderr,
+		  "scheme:   [%s]\n"
+		  "user:     [%s]\n"
+		  "password: [%s]\n"
+		  "host:     [%s]\n"
+		  "port:     [%d]\n"
+		  "document: [%s]\n",
+		  u->scheme, u->user, u->pwd,
+		  u->host, u->port, u->doc));
+
+	return (u);
+
+ouch:
+	free(u);
+	return (NULL);
+}
+
+/*
+ * Free a URL
+ */
+void
+fetchFreeURL(struct url *u)
+{
+	free(u->doc);
+	free(u);
+}