/* $NetBSD: http.c,v 1.6 2024/09/01 15:07:31 christos Exp $ */
/*-
* Copyright (c) 2000-2004 Dag-Erling Co�dan Sm�rgrav
* Copyright (c) 2003 Thomas Klausner <
[email protected]>
* Copyright (c) 2008, 2009 Joerg Sonnenberger <
[email protected]>
* 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.
*
* $FreeBSD: http.c,v 1.83 2008/02/06 11:39:55 des Exp $
*/
/*
* The following copyright applies to the base64 code:
*
*-
* Copyright 1997 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. 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.
*/
#if defined(__linux__) || defined(__MINT__) || defined(__FreeBSD_kernel__)
/* Keep this down to Linux or MiNT, it can create surprises elsewhere. */
/*
__FreeBSD_kernel__ is defined for GNU/kFreeBSD.
See
http://glibc-bsd.alioth.debian.org/porting/PORTING .
*/
#define _GNU_SOURCE
#endif
#ifndef _REENTRANT
/* Needed for gmtime_r on Interix */
#define _REENTRANT
#endif
#if HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef NETBSD
#include <nbcompat.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <ctype.h>
#include <errno.h>
#include <locale.h>
#include <stdarg.h>
#ifndef NETBSD
#include <nbcompat/stdio.h>
#else
#include <stdio.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#ifndef NETBSD
#include <nbcompat/netdb.h>
#else
#include <netdb.h>
#endif
#include <arpa/inet.h>
#include "fetch.h"
#include "common.h"
#include "httperr.h"
/* Maximum number of redirects to follow */
#define MAX_REDIRECT 5
/* Symbolic names for reply codes we care about */
#define HTTP_OK 200
#define HTTP_PARTIAL 206
#define HTTP_MOVED_PERM 301
#define HTTP_MOVED_TEMP 302
#define HTTP_SEE_OTHER 303
#define HTTP_NOT_MODIFIED 304
#define HTTP_TEMP_REDIRECT 307
#define HTTP_NEED_AUTH 401
#define HTTP_NEED_PROXY_AUTH 407
#define HTTP_BAD_RANGE 416
#define HTTP_PROTOCOL_ERROR 999
#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
|| (xyz) == HTTP_MOVED_TEMP \
|| (xyz) == HTTP_TEMP_REDIRECT \
|| (xyz) == HTTP_SEE_OTHER)
#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599)
/*****************************************************************************
* I/O functions for decoding chunked streams
*/
struct httpio
{
conn_t *conn; /* connection */
int chunked; /* chunked mode */
int keep_alive; /* keep-alive mode */
char *buf; /* chunk buffer */
size_t bufsize; /* size of chunk buffer */
ssize_t buflen; /* amount of data currently in buffer */
size_t bufpos; /* current read offset in buffer */
int eof; /* end-of-file flag */
int error; /* error flag */
size_t chunksize; /* remaining size of current chunk */
off_t contentlength; /* remaining size of the content */
};
/*
* Get next chunk header
*/
static ssize_t
http_new_chunk(struct httpio *io)
{
char *p;
if (fetch_getln(io->conn) == -1)
return (-1);
if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf))
return (-1);
for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) {
if (*p == ';')
break;
if (!isxdigit((unsigned char)*p))
return (-1);
if (isdigit((unsigned char)*p)) {
io->chunksize = io->chunksize * 16 +
*p - '0';
} else {
io->chunksize = io->chunksize * 16 +
10 + tolower((unsigned char)*p) - 'a';
}
}
return (io->chunksize);
}
/*
* Grow the input buffer to at least len bytes
*/
static int
http_growbuf(struct httpio *io, size_t len)
{
char *tmp;
if (io->bufsize >= len)
return (0);
if ((tmp = realloc(io->buf, len)) == NULL)
return (-1);
io->buf = tmp;
io->bufsize = len;
return (0);
}
/*
* Fill the input buffer, do chunk decoding on the fly
*/
static ssize_t
http_fillbuf(struct httpio *io, size_t len)
{
if (io->error)
return (-1);
if (io->eof)
return (0);
if (io->contentlength >= 0 && (off_t)len > io->contentlength)
len = io->contentlength;
if (io->chunked == 0) {
if (http_growbuf(io, len) == -1)
return (-1);
if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) {
io->error = 1;
return (-1);
}
if (io->contentlength)
io->contentlength -= io->buflen;
io->bufpos = 0;
return (io->buflen);
}
if (io->chunksize == 0) {
switch (http_new_chunk(io)) {
case -1:
io->error = 1;
return (-1);
case 0:
io->eof = 1;
if (fetch_getln(io->conn) == -1)
return (-1);
return (0);
}
}
if (len > io->chunksize)
len = io->chunksize;
if (http_growbuf(io, len) == -1)
return (-1);
if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) {
io->error = 1;
return (-1);
}
io->chunksize -= io->buflen;
if (io->contentlength >= 0)
io->contentlength -= io->buflen;
if (io->chunksize == 0) {
char endl[2];
ssize_t len2;
len2 = fetch_read(io->conn, endl, 2);
if (len2 == 1 && fetch_read(io->conn, endl + 1, 1) != 1)
return (-1);
if (len2 == -1 || endl[0] != '\r' || endl[1] != '\n')
return (-1);
}
io->bufpos = 0;
return (io->buflen);
}
/*
* Read function
*/
static ssize_t
http_readfn(void *v, void *buf, size_t len)
{
struct httpio *io = (struct httpio *)v;
size_t l, pos;
if (io->error)
return (-1);
if (io->eof)
return (0);
for (pos = 0; len > 0; pos += l, len -= l) {
/* empty buffer */
if (!io->buf || (ssize_t)io->bufpos == io->buflen)
if (http_fillbuf(io, len) < 1)
break;
l = io->buflen - io->bufpos;
if (len < l)
l = len;
memcpy((char *)buf + pos, io->buf + io->bufpos, l);
io->bufpos += l;
}
if (!pos && io->error)
return (-1);
return (pos);
}
/*
* Write function
*/
static ssize_t
http_writefn(void *v, const void *buf, size_t len)
{
struct httpio *io = (struct httpio *)v;
return (fetch_write(io->conn, buf, len));
}
/*
* Close function
*/
static void
http_closefn(void *v)
{
struct httpio *io = (struct httpio *)v;
if (io->keep_alive) {
int val;
val = 0;
setsockopt(io->conn->sd, IPPROTO_TCP, TCP_NODELAY, &val,
(socklen_t)sizeof(val));
fetch_cache_put(io->conn, fetch_close);
#if defined(TCP_NOPUSH) && !defined(__APPLE__)
val = 1;
setsockopt(io->conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val,
sizeof(val));
#endif
} else {
fetch_close(io->conn);
}
free(io->buf);
free(io);
}
/*
* Wrap a file descriptor up
*/
static fetchIO *
http_funopen(conn_t *conn, int chunked, int keep_alive, off_t clength)
{
struct httpio *io;
fetchIO *f;
if ((io = calloc(1, sizeof(*io))) == NULL) {
fetch_syserr();
return (NULL);
}
io->conn = conn;
io->chunked = chunked;
io->contentlength = clength;
io->keep_alive = keep_alive;
f = fetchIO_unopen(io, http_readfn, http_writefn, http_closefn);
if (f == NULL) {
fetch_syserr();
free(io);
return (NULL);
}
return (f);
}
/*****************************************************************************
* Helper functions for talking to the server and parsing its replies
*/
/* Header types */
typedef enum {
hdr_syserror = -2,
hdr_error = -1,
hdr_end = 0,
hdr_unknown = 1,
hdr_connection,
hdr_content_length,
hdr_content_range,
hdr_last_modified,
hdr_location,
hdr_transfer_encoding,
hdr_www_authenticate
} hdr_t;
/* Names of interesting headers */
static struct {
hdr_t num;
const char *name;
} hdr_names[] = {
{ hdr_connection, "Connection" },
{ hdr_content_length, "Content-Length" },
{ hdr_content_range, "Content-Range" },
{ hdr_last_modified, "Last-Modified" },
{ hdr_location, "Location" },
{ hdr_transfer_encoding, "Transfer-Encoding" },
{ hdr_www_authenticate, "WWW-Authenticate" },
{ hdr_unknown, NULL },
};
/*
* Send a formatted line; optionally echo to terminal
*/
LIBFETCH_PRINTFLIKE(2, 3)
static int
http_cmd(conn_t *conn, const char *fmt, ...)
{
va_list ap;
size_t len;
char *msg;
ssize_t r;
va_start(ap, fmt);
len = vasprintf(&msg, fmt, ap);
va_end(ap);
if (msg == NULL) {
errno = ENOMEM;
fetch_syserr();
return (-1);
}
r = fetch_write(conn, msg, len);
free(msg);
if (r == -1) {
fetch_syserr();
return (-1);
}
return (0);
}
/*
* Get and parse status line
*/
static int
http_get_reply(conn_t *conn)
{
char *p;
if (fetch_getln(conn) == -1)
return (-1);
/*
* A valid status line looks like "HTTP/m.n xyz reason" where m
* and n are the major and minor protocol version numbers and xyz
* is the reply code.
* Unfortunately, there are servers out there (NCSA 1.5.1, to name
* just one) that do not send a version number, so we can't rely
* on finding one, but if we do, insist on it being 1.0 or 1.1.
* We don't care about the reason phrase.
*/
if (strncmp(conn->buf, "HTTP", 4) != 0)
return (HTTP_PROTOCOL_ERROR);
p = conn->buf + 4;
if (*p == '/') {
if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1'))
return (HTTP_PROTOCOL_ERROR);
p += 4;
}
if (*p != ' ' ||
!isdigit((unsigned char)p[1]) ||
!isdigit((unsigned char)p[2]) ||
!isdigit((unsigned char)p[3]))
return (HTTP_PROTOCOL_ERROR);
conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0');
return (conn->err);
}
/*
* Check a header; if the type matches the given string, return a pointer
* to the beginning of the value.
*/
static const char *
http_match(const char *str, const char *hdr)
{
while (*str && *hdr &&
tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++))
/* nothing */;
if (*str || *hdr != ':')
return (NULL);
while (*hdr && isspace((unsigned char)*++hdr))
/* nothing */;
return (hdr);
}
/*
* Get the next header and return the appropriate symbolic code.
*/
static hdr_t
http_next_header(conn_t *conn, const char **p)
{
int i;
if (fetch_getln(conn) == -1)
return (hdr_syserror);
while (conn->buflen && isspace((unsigned char)conn->buf[conn->buflen - 1]))
conn->buflen--;
conn->buf[conn->buflen] = '\0';
if (conn->buflen == 0)
return (hdr_end);
/*
* We could check for malformed headers but we don't really care.
* A valid header starts with a token immediately followed by a
* colon; a token is any sequence of non-control, non-whitespace
* characters except "()<>@,;:\\\"{}".
*/
for (i = 0; hdr_names[i].num != hdr_unknown; i++)
if ((*p = http_match(hdr_names[i].name, conn->buf)) != NULL)
return (hdr_names[i].num);
return (hdr_unknown);
}
/*
* Parse a last-modified header
*/
static int
http_parse_mtime(const char *p, time_t *mtime)
{
struct tm tm;
char *r;
#ifdef LC_C_LOCALE
r = strptime_l(p, "%a, %d %b %Y %H:%M:%S GMT", &tm, LC_C_LOCALE);
#else
char *locale;
locale = strdup(setlocale(LC_TIME, NULL));
if (locale == NULL)
return (-1);
setlocale(LC_TIME, "C");
r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
/* XXX should add support for date-2 and date-3 */
setlocale(LC_TIME, locale);
free(locale);
#endif
if (r == NULL)
return (-1);
*mtime = timegm(&tm);
return (0);
}
/*
* Parse a content-length header
*/
static int
http_parse_length(const char *p, off_t *length)
{
off_t len;
for (len = 0; *p && isdigit((unsigned char)*p); ++p)
len = len * 10 + (*p - '0');
if (*p)
return (-1);
*length = len;
return (0);
}
/*
* Parse a content-range header
*/
static int
http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size)
{
off_t first, last, len;
if (strncasecmp(p, "bytes ", 6) != 0)
return (-1);
p += 6;
if (*p == '*') {
first = last = -1;
++p;
} else {
for (first = 0; *p && isdigit((unsigned char)*p); ++p)
first = first * 10 + *p - '0';
if (*p != '-')
return (-1);
for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p)
last = last * 10 + *p - '0';
}
if (first > last || *p != '/')
return (-1);
for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p)
len = len * 10 + *p - '0';
if (*p || len < last - first + 1)
return (-1);
if (first == -1)
*length = 0;
else
*length = last - first + 1;
*offset = first;
*size = len;
return (0);
}
/*****************************************************************************
* Helper functions for authorization
*/
/*
* Base64 encoding
*/
static char *
http_base64(const char *src)
{
static const char base64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
char *str, *dst;
size_t l;
unsigned int t, r;
l = strlen(src);
if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL)
return (NULL);
dst = str;
r = 0;
while (l >= 3) {
t = (src[0] << 16) | (src[1] << 8) | src[2];
dst[0] = base64[(t >> 18) & 0x3f];
dst[1] = base64[(t >> 12) & 0x3f];
dst[2] = base64[(t >> 6) & 0x3f];
dst[3] = base64[(t >> 0) & 0x3f];
src += 3; l -= 3;
dst += 4; r += 4;
}
switch (l) {
case 2:
t = (src[0] << 16) | (src[1] << 8);
dst[0] = base64[(t >> 18) & 0x3f];
dst[1] = base64[(t >> 12) & 0x3f];
dst[2] = base64[(t >> 6) & 0x3f];
dst[3] = '=';
dst += 4;
r += 4;
break;
case 1:
t = src[0] << 16;
dst[0] = base64[(t >> 18) & 0x3f];
dst[1] = base64[(t >> 12) & 0x3f];
dst[2] = dst[3] = '=';
dst += 4;
r += 4;
break;
case 0:
break;
}
*dst = 0;
return (str);
}
/*
* Encode username and password
*/
static int
http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd)
{
char *upw, *auth;
int r;
if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
return (-1);
auth = http_base64(upw);
free(upw);
if (auth == NULL)
return (-1);
r = http_cmd(conn, "%s: Basic %s\r\n", hdr, auth);
free(auth);
return (r);
}
/*
* Send an authorization header
*/
static int
http_authorize(conn_t *conn, const char *hdr, const char *p)
{
/* basic authorization */
if (strncasecmp(p, "basic:", 6) == 0) {
char *user, *pwd, *str;
int r;
/* skip realm */
for (p += 6; *p && *p != ':'; ++p)
/* nothing */ ;
if (!*p || strchr(++p, ':') == NULL)
return (-1);
if ((str = strdup(p)) == NULL)
return (-1); /* XXX */
user = str;
pwd = strchr(str, ':');
*pwd++ = '\0';
r = http_basic_auth(conn, hdr, user, pwd);
free(str);
return (r);
}
return (-1);
}
/*****************************************************************************
* Helper functions for connecting to a server or proxy
*/
/*
* Connect to the correct HTTP server or proxy.
*/
static conn_t *
http_connect(struct url *URL, struct url *purl, const char *flags, int *cached)
{
struct url *curl;
conn_t *conn;
hdr_t h;
const char *p;
int af, verbose;
#if defined(TCP_NOPUSH) && !defined(__APPLE__)
int val;
#endif
*cached = 0;
#ifdef INET6
af = AF_UNSPEC;
#else
af = AF_INET;
#endif
verbose = CHECK_FLAG('v');
if (CHECK_FLAG('4'))
af = AF_INET;
#ifdef INET6
else if (CHECK_FLAG('6'))
af = AF_INET6;
#endif
curl = (purl != NULL) ? purl : URL;
if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) {
URL = purl;
} else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) {
/* can't talk http to an ftp server */
/* XXX should set an error code */
return (NULL);
}
if ((conn = fetch_cache_get(curl, af)) != NULL) {
*cached = 1;
return (conn);
}
if ((conn = fetch_connect(curl, af, verbose)) == NULL)
/* fetch_connect() has already set an error code */
return (NULL);
if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && purl) {
http_cmd(conn, "CONNECT %s:%d HTTP/1.1\r\n",
URL->host, URL->port);
http_cmd(conn, "Host: %s:%d\r\n",
URL->host, URL->port);
/* proxy authorization */
if (*purl->user || *purl->pwd)
http_basic_auth(conn, "Proxy-Authorization",
purl->user, purl->pwd);
else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0')
http_authorize(conn, "Proxy-Authorization", p);
http_cmd(conn, "\r\n");
if (http_get_reply(conn) != HTTP_OK) {
http_seterr(conn->err);
goto ouch;
}
/* Read and discard the rest of the proxy response (if any) */
do {
switch ((h = http_next_header(conn, &p))) {
case hdr_syserror:
fetch_syserr();
goto ouch;
case hdr_error:
http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
default:
/* ignore */ ;
}
} while (h > hdr_end);
}
if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 &&
fetch_ssl(conn, URL, verbose) == -1) {
/* grrr */
#ifdef EAUTH
errno = EAUTH;
#else
errno = EPERM;
#endif
goto ouch;
}
#if defined(TCP_NOPUSH) && !defined(__APPLE__)
val = 1;
setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val));
#endif
return (conn);
ouch:
fetch_close(conn);
return (NULL);
}
static struct url *
http_get_proxy(struct url * url, const char *flags)
{
struct url *purl;
char *p;
if (flags != NULL && strchr(flags, 'd') != NULL)
return (NULL);
if (fetch_no_proxy_match(url->host))
return (NULL);
if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
*p && (purl = fetchParseURL(p))) {
if (!*purl->scheme)
strcpy(purl->scheme, SCHEME_HTTP);
if (!purl->port)
purl->port = fetch_default_proxy_port(purl->scheme);
if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
return (purl);
fetchFreeURL(purl);
}
return (NULL);
}
static void
set_if_modified_since(conn_t *conn, time_t last_modified)
{
static const char weekdays[] = "SunMonTueWedThuFriSat";
static const char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
struct tm tm;
char buf[80];
gmtime_r(&last_modified, &tm);
snprintf(buf, sizeof(buf), "%.3s, %02d %.3s %4ld %02d:%02d:%02d GMT",
weekdays + tm.tm_wday * 3, tm.tm_mday, months + tm.tm_mon * 3,
(long)tm.tm_year + 1900, tm.tm_hour, tm.tm_min, tm.tm_sec);
http_cmd(conn, "If-Modified-Since: %s\r\n", buf);
}
/*****************************************************************************
* Core
*/
/*
* Send a request and process the reply
*
* XXX This function is way too long, the do..while loop should be split
* XXX off into a separate function.
*/
fetchIO *
http_request(struct url *URL, const char *op, struct url_stat *us,
struct url *purl, const char *flags)
{
conn_t *conn;
struct url *url, *new;
int chunked, direct, if_modified_since, need_auth, noredirect;
int keep_alive, verbose, cached;
int e, i, n, val;
off_t offset, clength, length, size;
time_t mtime;
const char *p;
fetchIO *f;
hdr_t h;
char hbuf[URL_HOSTLEN + 7], *host;
direct = CHECK_FLAG('d');
noredirect = CHECK_FLAG('A');
verbose = CHECK_FLAG('v');
if_modified_since = CHECK_FLAG('i');
keep_alive = 0;
if (direct && purl) {
fetchFreeURL(purl);
purl = NULL;
}
/* try the provided URL first */
url = URL;
/* if the A flag is set, we only get one try */
n = noredirect ? 1 : MAX_REDIRECT;
i = 0;
e = HTTP_PROTOCOL_ERROR;
need_auth = 0;
do {
new = NULL;
chunked = 0;
offset = 0;
clength = -1;
length = -1;
size = -1;
mtime = 0;
/* check port */
if (!url->port)
url->port = fetch_default_port(url->scheme);
/* were we redirected to an FTP URL? */
if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) {
if (strcmp(op, "GET") == 0)
return (ftp_request(url, "RETR", NULL, us, purl, flags));
else if (strcmp(op, "HEAD") == 0)
return (ftp_request(url, "STAT", NULL, us, purl, flags));
}
/* connect to server or proxy */
if ((conn = http_connect(url, purl, flags, &cached)) == NULL)
goto ouch;
host = url->host;
#ifdef INET6
if (strchr(url->host, ':')) {
snprintf(hbuf, sizeof(hbuf), "[%s]", url->host);
host = hbuf;
}
#endif
if (url->port != fetch_default_port(url->scheme)) {
if (host != hbuf) {
strcpy(hbuf, host);
host = hbuf;
}
snprintf(hbuf + strlen(hbuf),
sizeof(hbuf) - strlen(hbuf), ":%d", url->port);
}
/* send request */
if (verbose)
fetch_info("requesting %s://%s%s",
url->scheme, host, url->doc);
if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) {
http_cmd(conn, "%s %s://%s%s HTTP/1.1\r\n",
op, url->scheme, host, url->doc);
} else {
http_cmd(conn, "%s %s HTTP/1.1\r\n",
op, url->doc);
}
if (if_modified_since && url->last_modified > 0)
set_if_modified_since(conn, url->last_modified);
/* virtual host */
http_cmd(conn, "Host: %s\r\n", host);
/* proxy authorization */
if (purl) {
if (*purl->user || *purl->pwd)
http_basic_auth(conn, "Proxy-Authorization",
purl->user, purl->pwd);
else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0')
http_authorize(conn, "Proxy-Authorization", p);
}
/* server authorization */
if (need_auth || *url->user || *url->pwd) {
if (*url->user || *url->pwd)
http_basic_auth(conn, "Authorization", url->user, url->pwd);
else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0')
http_authorize(conn, "Authorization", p);
else if (fetchAuthMethod && fetchAuthMethod(url) == 0) {
http_basic_auth(conn, "Authorization", url->user, url->pwd);
} else {
http_seterr(HTTP_NEED_AUTH);
goto ouch;
}
}
/* other headers */
if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') {
if (strcasecmp(p, "auto") == 0)
http_cmd(conn, "Referer: %s://%s%s\r\n",
url->scheme, host, url->doc);
else
http_cmd(conn, "Referer: %s\r\n", p);
}
if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0')
http_cmd(conn, "User-Agent: %s\r\n", p);
else
http_cmd(conn, "User-Agent: %s\r\n", _LIBFETCH_VER);
if (url->offset > 0)
http_cmd(conn, "Range: bytes=%lld-\r\n", (long long)url->offset);
http_cmd(conn, "\r\n");
/*
* Force the queued request to be dispatched. Normally, one
* would do this with shutdown(2) but squid proxies can be
* configured to disallow such half-closed connections. To
* be compatible with such configurations, fiddle with socket
* options to force the pending data to be written.
*/
#if defined(TCP_NOPUSH) && !defined(__APPLE__)
val = 0;
setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val,
sizeof(val));
#endif
val = 1;
setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val,
(socklen_t)sizeof(val));
/* get reply */
switch (http_get_reply(conn)) {
case HTTP_OK:
case HTTP_PARTIAL:
case HTTP_NOT_MODIFIED:
/* fine */
break;
case HTTP_MOVED_PERM:
case HTTP_MOVED_TEMP:
case HTTP_SEE_OTHER:
/*
* Not so fine, but we still have to read the
* headers to get the new location.
*/
break;
case HTTP_NEED_AUTH:
if (need_auth) {
/*
* We already sent out authorization code,
* so there's nothing more we can do.
*/
http_seterr(conn->err);
goto ouch;
}
/* try again, but send the password this time */
if (verbose)
fetch_info("server requires authorization");
break;
case HTTP_NEED_PROXY_AUTH:
/*
* If we're talking to a proxy, we already sent
* our proxy authorization code, so there's
* nothing more we can do.
*/
http_seterr(conn->err);
goto ouch;
case HTTP_BAD_RANGE:
/*
* This can happen if we ask for 0 bytes because
* we already have the whole file. Consider this
* a success for now, and check sizes later.
*/
break;
case HTTP_PROTOCOL_ERROR:
/* fall through */
case -1:
--i;
if (cached)
continue;
fetch_syserr();
goto ouch;
default:
http_seterr(conn->err);
if (!verbose)
goto ouch;
/* fall through so we can get the full error message */
}
/* get headers */
do {
switch ((h = http_next_header(conn, &p))) {
case hdr_syserror:
fetch_syserr();
goto ouch;
case hdr_error:
http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
case hdr_connection:
/* XXX too weak? */
keep_alive = (strcasecmp(p, "keep-alive") == 0);
break;
case hdr_content_length:
http_parse_length(p, &clength);
break;
case hdr_content_range:
http_parse_range(p, &offset, &length, &size);
break;
case hdr_last_modified:
http_parse_mtime(p, &mtime);
break;
case hdr_location:
if (!HTTP_REDIRECT(conn->err))
break;
if (new)
free(new);
if (verbose)
fetch_info("%d redirect to %s", conn->err, p);
if (*p == '/')
/* absolute path */
new = fetchMakeURL(url->scheme, url->host, url->port, p,
url->user, url->pwd);
else
new = fetchParseURL(p);
if (new == NULL) {
/* XXX should set an error code */
goto ouch;
}
if (!*new->user && !*new->pwd) {
strcpy(new->user, url->user);
strcpy(new->pwd, url->pwd);
}
new->offset = url->offset;
new->length = url->length;
break;
case hdr_transfer_encoding:
/* XXX weak test*/
chunked = (strcasecmp(p, "chunked") == 0);
break;
case hdr_www_authenticate:
if (conn->err != HTTP_NEED_AUTH)
break;
/* if we were smarter, we'd check the method and realm */
break;
case hdr_end:
/* fall through */
case hdr_unknown:
/* ignore */
break;
}
} while (h > hdr_end);
/* we need to provide authentication */
if (conn->err == HTTP_NEED_AUTH) {
e = conn->err;
need_auth = 1;
fetch_close(conn);
conn = NULL;
continue;
}
/* requested range not satisfiable */
if (conn->err == HTTP_BAD_RANGE) {
if (url->offset == size && url->length == 0) {
/* asked for 0 bytes; fake it */
offset = url->offset;
conn->err = HTTP_OK;
break;
} else {
http_seterr(conn->err);
goto ouch;
}
}
/* we have a hit or an error */
if (conn->err == HTTP_OK ||
conn->err == HTTP_PARTIAL ||
conn->err == HTTP_NOT_MODIFIED ||
HTTP_ERROR(conn->err))
break;
/* all other cases: we got a redirect */
e = conn->err;
need_auth = 0;
fetch_close(conn);
conn = NULL;
if (!new)
break;
if (url != URL)
fetchFreeURL(url);
url = new;
} while (++i < n);
/* we failed, or ran out of retries */
if (conn == NULL) {
http_seterr(e);
goto ouch;
}
/* check for inconsistencies */
if (clength != -1 && length != -1 && clength != length) {
http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
}
if (clength == -1)
clength = length;
if (clength != -1)
length = offset + clength;
if (length != -1 && size != -1 && length != size) {
http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
}
if (size == -1)
size = length;
/* fill in stats */
if (us) {
us->size = size;
us->atime = us->mtime = mtime;
}
/* too far? */
if (URL->offset > 0 && offset > URL->offset) {
http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
}
/* report back real offset and size */
URL->offset = offset;
URL->length = clength;
if (clength == -1 && !chunked)
keep_alive = 0;
if (conn->err == HTTP_NOT_MODIFIED) {
http_seterr(HTTP_NOT_MODIFIED);
if (keep_alive) {
fetch_cache_put(conn, fetch_close);
conn = NULL;
}
goto ouch;
}
/* wrap it up in a fetchIO */
if ((f = http_funopen(conn, chunked, keep_alive, clength)) == NULL) {
fetch_syserr();
goto ouch;
}
if (url != URL)
fetchFreeURL(url);
if (purl)
fetchFreeURL(purl);
if (HTTP_ERROR(conn->err)) {
if (keep_alive) {
char buf[512];
do {
} while (fetchIO_read(f, buf, sizeof(buf)) > 0);
}
fetchIO_close(f);
f = NULL;
}
return (f);
ouch:
if (url != URL)
fetchFreeURL(url);
if (purl)
fetchFreeURL(purl);
if (conn != NULL)
fetch_close(conn);
return (NULL);
}
/*****************************************************************************
* Entry points
*/
/*
* Retrieve and stat a file by HTTP
*/
fetchIO *
fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags)
{
return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags));
}
/*
* Retrieve a file by HTTP
*/
fetchIO *
fetchGetHTTP(struct url *URL, const char *flags)
{
return (fetchXGetHTTP(URL, NULL, flags));
}
/*
* Store a file by HTTP
*/
fetchIO *
/*ARGSUSED*/
fetchPutHTTP(struct url *URL __unused, const char *flags __unused)
{
fprintf(stderr, "fetchPutHTTP(): not implemented\n");
return (NULL);
}
/*
* Get an HTTP document's metadata
*/
int
fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags)
{
fetchIO *f;
f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags);
if (f == NULL)
return (-1);
fetchIO_close(f);
return (0);
}
enum http_states {
ST_NONE,
ST_LT,
ST_LTA,
ST_TAGA,
ST_H,
ST_R,
ST_E,
ST_F,
ST_HREF,
ST_HREFQ,
ST_TAG,
ST_TAGAX,
ST_TAGAQ
};
struct index_parser {
struct url_list *ue;
struct url *url;
enum http_states state;
};
static ssize_t
parse_index(struct index_parser *parser, const char *buf, size_t len)
{
char *end_attr, p = *buf;
switch (parser->state) {
case ST_NONE:
/* Plain text, not in markup */
if (p == '<')
parser->state = ST_LT;
return 1;
case ST_LT:
/* In tag -- "<" already found */
if (p == '>')
parser->state = ST_NONE;
else if (p == 'a' || p == 'A')
parser->state = ST_LTA;
else if (!isspace((unsigned char)p))
parser->state = ST_TAG;
return 1;
case ST_LTA:
/* In tag -- "<a" already found */
if (p == '>')
parser->state = ST_NONE;
else if (p == '"')
parser->state = ST_TAGAQ;
else if (isspace((unsigned char)p))
parser->state = ST_TAGA;
else
parser->state = ST_TAG;
return 1;
case ST_TAG:
/* In tag, but not "<a" -- disregard */
if (p == '>')
parser->state = ST_NONE;
return 1;
case ST_TAGA:
/* In a-tag -- "<a " already found */
if (p == '>')
parser->state = ST_NONE;
else if (p == '"')
parser->state = ST_TAGAQ;
else if (p == 'h' || p == 'H')
parser->state = ST_H;
else if (!isspace((unsigned char)p))
parser->state = ST_TAGAX;
return 1;
case ST_TAGAX:
/* In unknown keyword in a-tag */
if (p == '>')
parser->state = ST_NONE;
else if (p == '"')
parser->state = ST_TAGAQ;
else if (isspace((unsigned char)p))
parser->state = ST_TAGA;
return 1;
case ST_TAGAQ:
/* In a-tag, unknown argument for keys. */
if (p == '>')
parser->state = ST_NONE;
else if (p == '"')
parser->state = ST_TAGA;
return 1;
case ST_H:
/* In a-tag -- "<a h" already found */
if (p == '>')
parser->state = ST_NONE;
else if (p == '"')
parser->state = ST_TAGAQ;
else if (p == 'r' || p == 'R')
parser->state = ST_R;
else if (isspace((unsigned char)p))
parser->state = ST_TAGA;
else
parser->state = ST_TAGAX;
return 1;
case ST_R:
/* In a-tag -- "<a hr" already found */
if (p == '>')
parser->state = ST_NONE;
else if (p == '"')
parser->state = ST_TAGAQ;
else if (p == 'e' || p == 'E')
parser->state = ST_E;
else if (isspace((unsigned char)p))
parser->state = ST_TAGA;
else
parser->state = ST_TAGAX;
return 1;
case ST_E:
/* In a-tag -- "<a hre" already found */
if (p == '>')
parser->state = ST_NONE;
else if (p == '"')
parser->state = ST_TAGAQ;
else if (p == 'f' || p == 'F')
parser->state = ST_F;
else if (isspace((unsigned char)p))
parser->state = ST_TAGA;
else
parser->state = ST_TAGAX;
return 1;
case ST_F:
/* In a-tag -- "<a href" already found */
if (p == '>')
parser->state = ST_NONE;
else if (p == '"')
parser->state = ST_TAGAQ;
else if (p == '=')
parser->state = ST_HREF;
else if (!isspace((unsigned char)p))
parser->state = ST_TAGAX;
return 1;
case ST_HREF:
/* In a-tag -- "<a href=" already found */
if (p == '>')
parser->state = ST_NONE;
else if (p == '"')
parser->state = ST_HREFQ;
else if (!isspace((unsigned char)p))
parser->state = ST_TAGA;
return 1;
case ST_HREFQ:
/* In href of the a-tag */
end_attr = memchr(buf, '"', len);
if (end_attr == NULL)
return 0;
*end_attr = '\0';
parser->state = ST_TAGA;
if (fetch_add_entry(parser->ue, parser->url, buf, 1))
return -1;
return end_attr + 1 - buf;
}
/* NOTREACHED */
abort();
}
struct http_index_cache {
struct http_index_cache *next;
struct url *location;
struct url_list ue;
};
static struct http_index_cache *index_cache;
/*
* List a directory
*/
int
/*ARGSUSED*/
fetchListHTTP(struct url_list *ue, struct url *url, const char *pattern __unused, const char *flags)
{
fetchIO *f;
char buf[2 * PATH_MAX];
size_t buf_len, sum_processed;
ssize_t read_len, processed;
struct index_parser state;
struct http_index_cache *cache = NULL;
int do_cache, ret;
do_cache = CHECK_FLAG('c');
if (do_cache) {
for (cache = index_cache; cache != NULL; cache = cache->next) {
if (strcmp(cache->location->scheme, url->scheme))
continue;
if (strcmp(cache->location->user, url->user))
continue;
if (strcmp(cache->location->pwd, url->pwd))
continue;
if (strcmp(cache->location->host, url->host))
continue;
if (cache->location->port != url->port)
continue;
if (strcmp(cache->location->doc, url->doc))
continue;
return fetchAppendURLList(ue, &cache->ue);
}
cache = malloc(sizeof(*cache));
fetchInitURLList(&cache->ue);
cache->location = fetchCopyURL(url);
}
f = fetchGetHTTP(url, flags);
if (f == NULL) {
if (do_cache) {
fetchFreeURLList(&cache->ue);
fetchFreeURL(cache->location);
free(cache);
}
return -1;
}
state.url = url;
state.state = ST_NONE;
if (do_cache) {
state.ue = &cache->ue;
} else {
state.ue = ue;
}
buf_len = 0;
while ((read_len = fetchIO_read(f, buf + buf_len, sizeof(buf) - buf_len)) > 0) {
buf_len += read_len;
sum_processed = 0;
do {
processed = parse_index(&state, buf + sum_processed, buf_len);
if (processed == -1)
break;
buf_len -= processed;
sum_processed += processed;
} while (processed != 0 && buf_len > 0);
if (processed == -1) {
read_len = -1;
break;
}
memmove(buf, buf + sum_processed, buf_len);
}
fetchIO_close(f);
ret = read_len < 0 ? -1 : 0;
if (do_cache) {
if (ret == 0) {
cache->next = index_cache;
index_cache = cache;
}
if (fetchAppendURLList(ue, &cache->ue))
ret = -1;
}
return ret;
}
