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freebsd-dev/lib/libfetch/http.c
Mark Johnston f4e05cc55d Document fetchReqHTTP(). 
Submitted by:	Farhan Khan <khanzf@gmail.com>
Reviewed by:	0mp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D18788
2019-08-28 17:01:28 +00:00

2107 lines
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2000-2014 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("$FreeBSD$");
/*
* 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.
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#ifdef WITH_SSL
#include <openssl/md5.h>
#define MD5Init(c) MD5_Init(c)
#define MD5Update(c, data, len) MD5_Update(c, data, len)
#define MD5Final(md, c) MD5_Final(md, c)
#else
#include <md5.h>
#endif
#include <netinet/in.h>
#include <netinet/tcp.h>
#include "fetch.h"
#include "common.h"
#include "httperr.h"
/* Maximum number of redirects to follow */
#define MAX_REDIRECT 20
/* 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_USE_PROXY 305
#define HTTP_TEMP_REDIRECT 307
#define HTTP_PERM_REDIRECT 308
#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_PERM_REDIRECT \
|| (xyz) == HTTP_USE_PROXY \
|| (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 */
char *buf; /* chunk buffer */
size_t bufsize; /* size of chunk buffer */
size_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 */
#ifndef NDEBUG
size_t total;
#endif
};
/*
* Get next chunk header
*/
static int
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';
}
}
#ifndef NDEBUG
if (fetchDebug) {
io->total += io->chunksize;
if (io->chunksize == 0)
fprintf(stderr, "%s(): end of last chunk\n", __func__);
else
fprintf(stderr, "%s(): new chunk: %lu (%lu)\n",
__func__, (unsigned long)io->chunksize,
(unsigned long)io->total);
}
#endif
return (io->chunksize);
}
/*
* Grow the input buffer to at least len bytes
*/
static inline 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)
{
ssize_t nbytes;
char ch;
if (io->error)
return (-1);
if (io->eof)
return (0);
/* not chunked: just fetch the requested amount */
if (io->chunked == 0) {
if (http_growbuf(io, len) == -1)
return (-1);
if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) {
io->error = errno;
return (-1);
}
io->buflen = nbytes;
io->bufpos = 0;
return (io->buflen);
}
/* chunked, but we ran out: get the next chunk header */
if (io->chunksize == 0) {
switch (http_new_chunk(io)) {
case -1:
io->error = EPROTO;
return (-1);
case 0:
io->eof = 1;
return (0);
}
}
/* fetch the requested amount, but no more than the current chunk */
if (len > io->chunksize)
len = io->chunksize;
if (http_growbuf(io, len) == -1)
return (-1);
if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) {
io->error = errno;
return (-1);
}
io->bufpos = 0;
io->buflen = nbytes;
io->chunksize -= nbytes;
if (io->chunksize == 0) {
if (fetch_read(io->conn, &ch, 1) != 1 || ch != '\r' ||
fetch_read(io->conn, &ch, 1) != 1 || ch != '\n')
return (-1);
}
return (io->buflen);
}
/*
* Read function
*/
static int
http_readfn(void *v, char *buf, int len)
{
struct httpio *io = (struct httpio *)v;
int rlen;
if (io->error)
return (-1);
if (io->eof)
return (0);
/* empty buffer */
if (!io->buf || io->bufpos == io->buflen) {
if ((rlen = http_fillbuf(io, len)) < 0) {
if ((errno = io->error) == EINTR)
io->error = 0;
return (-1);
} else if (rlen == 0) {
return (0);
}
}
rlen = io->buflen - io->bufpos;
if (len < rlen)
rlen = len;
memcpy(buf, io->buf + io->bufpos, rlen);
io->bufpos += rlen;
return (rlen);
}
/*
* Write function
*/
static int
http_writefn(void *v, const char *buf, int len)
{
struct httpio *io = (struct httpio *)v;
return (fetch_write(io->conn, buf, len));
}
/*
* Close function
*/
static int
http_closefn(void *v)
{
struct httpio *io = (struct httpio *)v;
int r;
r = fetch_close(io->conn);
if (io->buf)
free(io->buf);
free(io);
return (r);
}
/*
* Wrap a file descriptor up
*/
static FILE *
http_funopen(conn_t *conn, int chunked)
{
struct httpio *io;
FILE *f;
if ((io = calloc(1, sizeof(*io))) == NULL) {
fetch_syserr();
return (NULL);
}
io->conn = conn;
io->chunked = chunked;
f = funopen(io, http_readfn, http_writefn, NULL, 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_content_length,
hdr_content_range,
hdr_last_modified,
hdr_location,
hdr_transfer_encoding,
hdr_www_authenticate,
hdr_proxy_authenticate,
} hdr_t;
/* Names of interesting headers */
static struct {
hdr_t num;
const char *name;
} hdr_names[] = {
{ 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_proxy_authenticate, "Proxy-Authenticate" },
{ hdr_unknown, NULL },
};
/*
* Send a formatted line; optionally echo to terminal
*/
static int
http_cmd(conn_t *conn, const char *fmt, ...)
{
va_list ap;
size_t len;
char *msg;
int r;
va_start(ap, fmt);
len = vasprintf(&msg, fmt, ap);
va_end(ap);
if (msg == NULL) {
errno = ENOMEM;
fetch_syserr();
return (-1);
}
r = fetch_putln(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. We
* need to read one line ahead for checking for a continuation line
* belonging to the current header (continuation lines start with
* white space).
*
* We get called with a fresh line already in the conn buffer, either
* from the previous http_next_header() invocation, or, the first
* time, from a fetch_getln() performed by our caller.
*
* This stops when we encounter an empty line (we dont read beyond the header
* area).
*
* Note that the "headerbuf" is just a place to return the result. Its
* contents are not used for the next call. This means that no cleanup
* is needed when ie doing another connection, just call the cleanup when
* fully done to deallocate memory.
*/
/* Limit the max number of continuation lines to some reasonable value */
#define HTTP_MAX_CONT_LINES 10
/* Place into which to build a header from one or several lines */
typedef struct {
char *buf; /* buffer */
size_t bufsize; /* buffer size */
size_t buflen; /* length of buffer contents */
} http_headerbuf_t;
static void
init_http_headerbuf(http_headerbuf_t *buf)
{
buf->buf = NULL;
buf->bufsize = 0;
buf->buflen = 0;
}
static void
clean_http_headerbuf(http_headerbuf_t *buf)
{
if (buf->buf)
free(buf->buf);
init_http_headerbuf(buf);
}
/* Remove whitespace at the end of the buffer */
static void
http_conn_trimright(conn_t *conn)
{
while (conn->buflen &&
isspace((unsigned char)conn->buf[conn->buflen - 1]))
conn->buflen--;
conn->buf[conn->buflen] = '\0';
}
static hdr_t
http_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p)
{
unsigned int i, len;
/*
* Have to do the stripping here because of the first line. So
* it's done twice for the subsequent lines. No big deal
*/
http_conn_trimright(conn);
if (conn->buflen == 0)
return (hdr_end);
/* Copy the line to the headerbuf */
if (hbuf->bufsize < conn->buflen + 1) {
if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL)
return (hdr_syserror);
hbuf->bufsize = conn->buflen + 1;
}
strcpy(hbuf->buf, conn->buf);
hbuf->buflen = conn->buflen;
/*
* Fetch possible continuation lines. Stop at 1st non-continuation
* and leave it in the conn buffer
*/
for (i = 0; i < HTTP_MAX_CONT_LINES; i++) {
if (fetch_getln(conn) == -1)
return (hdr_syserror);
/*
* Note: we carry on the idea from the previous version
* that a pure whitespace line is equivalent to an empty
* one (so it's not continuation and will be handled when
* we are called next)
*/
http_conn_trimright(conn);
if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0])
break;
/* Got a continuation line. Concatenate to previous */
len = hbuf->buflen + conn->buflen;
if (hbuf->bufsize < len + 1) {
len *= 2;
if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL)
return (hdr_syserror);
hbuf->bufsize = len + 1;
}
strcpy(hbuf->buf + hbuf->buflen, conn->buf);
hbuf->buflen += conn->buflen;
}
/*
* 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, hbuf->buf)) != NULL)
return (hdr_names[i].num);
return (hdr_unknown);
}
/**************************
* [Proxy-]Authenticate header parsing
*/
/*
* Read doublequote-delimited string into output buffer obuf (allocated
* by caller, whose responsibility it is to ensure that it's big enough)
* cp points to the first char after the initial '"'
* Handles \ quoting
* Returns pointer to the first char after the terminating double quote, or
* NULL for error.
*/
static const char *
http_parse_headerstring(const char *cp, char *obuf)
{
for (;;) {
switch (*cp) {
case 0: /* Unterminated string */
*obuf = 0;
return (NULL);
case '"': /* Ending quote */
*obuf = 0;
return (++cp);
case '\\':
if (*++cp == 0) {
*obuf = 0;
return (NULL);
}
/* FALLTHROUGH */
default:
*obuf++ = *cp++;
}
}
}
/* Http auth challenge schemes */
typedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t;
/* Data holder for a Basic or Digest challenge. */
typedef struct {
http_auth_schemes_t scheme;
char *realm;
char *qop;
char *nonce;
char *opaque;
char *algo;
int stale;
int nc; /* Nonce count */
} http_auth_challenge_t;
static void
init_http_auth_challenge(http_auth_challenge_t *b)
{
b->scheme = HTTPAS_UNKNOWN;
b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL;
b->stale = b->nc = 0;
}
static void
clean_http_auth_challenge(http_auth_challenge_t *b)
{
if (b->realm)
free(b->realm);
if (b->qop)
free(b->qop);
if (b->nonce)
free(b->nonce);
if (b->opaque)
free(b->opaque);
if (b->algo)
free(b->algo);
init_http_auth_challenge(b);
}
/* Data holder for an array of challenges offered in an http response. */
#define MAX_CHALLENGES 10
typedef struct {
http_auth_challenge_t *challenges[MAX_CHALLENGES];
int count; /* Number of parsed challenges in the array */
int valid; /* We did parse an authenticate header */
} http_auth_challenges_t;
static void
init_http_auth_challenges(http_auth_challenges_t *cs)
{
int i;
for (i = 0; i < MAX_CHALLENGES; i++)
cs->challenges[i] = NULL;
cs->count = cs->valid = 0;
}
static void
clean_http_auth_challenges(http_auth_challenges_t *cs)
{
int i;
/* We rely on non-zero pointers being allocated, not on the count */
for (i = 0; i < MAX_CHALLENGES; i++) {
if (cs->challenges[i] != NULL) {
clean_http_auth_challenge(cs->challenges[i]);
free(cs->challenges[i]);
}
}
init_http_auth_challenges(cs);
}
/*
* Enumeration for lexical elements. Separators will be returned as their own
* ascii value
*/
typedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258,
HTTPHL_ERROR = 259} http_header_lex_t;
/*
* Determine what kind of token comes next and return possible value
* in buf, which is supposed to have been allocated big enough by
* caller. Advance input pointer and return element type.
*/
static int
http_header_lex(const char **cpp, char *buf)
{
size_t l;
/* Eat initial whitespace */
*cpp += strspn(*cpp, " \t");
if (**cpp == 0)
return (HTTPHL_END);
/* Separator ? */
if (**cpp == ',' || **cpp == '=')
return (*((*cpp)++));
/* String ? */
if (**cpp == '"') {
*cpp = http_parse_headerstring(++*cpp, buf);
if (*cpp == NULL)
return (HTTPHL_ERROR);
return (HTTPHL_STRING);
}
/* Read other token, until separator or whitespace */
l = strcspn(*cpp, " \t,=");
memcpy(buf, *cpp, l);
buf[l] = 0;
*cpp += l;
return (HTTPHL_WORD);
}
/*
* Read challenges from http xxx-authenticate header and accumulate them
* in the challenges list structure.
*
* Headers with multiple challenges are specified by rfc2617, but
* servers (ie: squid) often send them in separate headers instead,
* which in turn is forbidden by the http spec (multiple headers with
* the same name are only allowed for pure comma-separated lists, see
* rfc2616 sec 4.2).
*
* We support both approaches anyway
*/
static int
http_parse_authenticate(const char *cp, http_auth_challenges_t *cs)
{
int ret = -1;
http_header_lex_t lex;
char *key = malloc(strlen(cp) + 1);
char *value = malloc(strlen(cp) + 1);
char *buf = malloc(strlen(cp) + 1);
if (key == NULL || value == NULL || buf == NULL) {
fetch_syserr();
goto out;
}
/* In any case we've seen the header and we set the valid bit */
cs->valid = 1;
/* Need word first */
lex = http_header_lex(&cp, key);
if (lex != HTTPHL_WORD)
goto out;
/* Loop on challenges */
for (; cs->count < MAX_CHALLENGES; cs->count++) {
cs->challenges[cs->count] =
malloc(sizeof(http_auth_challenge_t));
if (cs->challenges[cs->count] == NULL) {
fetch_syserr();
goto out;
}
init_http_auth_challenge(cs->challenges[cs->count]);
if (strcasecmp(key, "basic") == 0) {
cs->challenges[cs->count]->scheme = HTTPAS_BASIC;
} else if (strcasecmp(key, "digest") == 0) {
cs->challenges[cs->count]->scheme = HTTPAS_DIGEST;
} else {
cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN;
/*
* Continue parsing as basic or digest may
* follow, and the syntax is the same for
* all. We'll just ignore this one when
* looking at the list
*/
}
/* Loop on attributes */
for (;;) {
/* Key */
lex = http_header_lex(&cp, key);
if (lex != HTTPHL_WORD)
goto out;
/* Equal sign */
lex = http_header_lex(&cp, buf);
if (lex != '=')
goto out;
/* Value */
lex = http_header_lex(&cp, value);
if (lex != HTTPHL_WORD && lex != HTTPHL_STRING)
goto out;
if (strcasecmp(key, "realm") == 0) {
cs->challenges[cs->count]->realm =
strdup(value);
} else if (strcasecmp(key, "qop") == 0) {
cs->challenges[cs->count]->qop =
strdup(value);
} else if (strcasecmp(key, "nonce") == 0) {
cs->challenges[cs->count]->nonce =
strdup(value);
} else if (strcasecmp(key, "opaque") == 0) {
cs->challenges[cs->count]->opaque =
strdup(value);
} else if (strcasecmp(key, "algorithm") == 0) {
cs->challenges[cs->count]->algo =
strdup(value);
} else if (strcasecmp(key, "stale") == 0) {
cs->challenges[cs->count]->stale =
strcasecmp(value, "no");
} else {
/* ignore unknown attributes */
}
/* Comma or Next challenge or End */
lex = http_header_lex(&cp, key);
/*
* If we get a word here, this is the beginning of the
* next challenge. Break the attributes loop
*/
if (lex == HTTPHL_WORD)
break;
if (lex == HTTPHL_END) {
/* End while looking for ',' is normal exit */
cs->count++;
ret = 0;
goto out;
}
/* Anything else is an error */
if (lex != ',')
goto out;
} /* End attributes loop */
} /* End challenge loop */
/*
* Challenges max count exceeded. This really can't happen
* with normal data, something's fishy -> error
*/
out:
if (key)
free(key);
if (value)
free(value);
if (buf)
free(buf);
return (ret);
}
/*
* Parse a last-modified header
*/
static int
http_parse_mtime(const char *p, time_t *mtime)
{
char locale[64], *r;
struct tm tm;
strlcpy(locale, setlocale(LC_TIME, NULL), sizeof(locale));
setlocale(LC_TIME, "C");
r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
/*
* Some proxies use UTC in response, but it should still be
* parsed. RFC2616 states GMT and UTC are exactly equal for HTTP.
*/
if (r == NULL)
r = strptime(p, "%a, %d %b %Y %H:%M:%S UTC", &tm);
/* XXX should add support for date-2 and date-3 */
setlocale(LC_TIME, locale);
if (r == NULL)
return (-1);
DEBUGF("last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec);
*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);
DEBUGF("content length: [%lld]\n", (long long)len);
*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) {
DEBUGF("content range: [*/%lld]\n", (long long)len);
*length = 0;
} else {
DEBUGF("content range: [%lld-%lld/%lld]\n",
(long long)first, (long long)last, (long long)len);
*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;
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);
}
/*
* Extract authorization parameters from environment value.
* The value is like scheme:realm:user:pass
*/
typedef struct {
char *scheme;
char *realm;
char *user;
char *password;
} http_auth_params_t;
static void
init_http_auth_params(http_auth_params_t *s)
{
s->scheme = s->realm = s->user = s->password = NULL;
}
static void
clean_http_auth_params(http_auth_params_t *s)
{
if (s->scheme)
free(s->scheme);
if (s->realm)
free(s->realm);
if (s->user)
free(s->user);
if (s->password)
free(s->password);
init_http_auth_params(s);
}
static int
http_authfromenv(const char *p, http_auth_params_t *parms)
{
int ret = -1;
char *v, *ve;
char *str = strdup(p);
if (str == NULL) {
fetch_syserr();
return (-1);
}
v = str;
if ((ve = strchr(v, ':')) == NULL)
goto out;
*ve = 0;
if ((parms->scheme = strdup(v)) == NULL) {
fetch_syserr();
goto out;
}
v = ve + 1;
if ((ve = strchr(v, ':')) == NULL)
goto out;
*ve = 0;
if ((parms->realm = strdup(v)) == NULL) {
fetch_syserr();
goto out;
}
v = ve + 1;
if ((ve = strchr(v, ':')) == NULL)
goto out;
*ve = 0;
if ((parms->user = strdup(v)) == NULL) {
fetch_syserr();
goto out;
}
v = ve + 1;
if ((parms->password = strdup(v)) == NULL) {
fetch_syserr();
goto out;
}
ret = 0;
out:
if (ret == -1)
clean_http_auth_params(parms);
if (str)
free(str);
return (ret);
}
/*
* Digest response: the code to compute the digest is taken from the
* sample implementation in RFC2616
*/
#define IN const
#define OUT
#define HASHLEN 16
typedef char HASH[HASHLEN];
#define HASHHEXLEN 32
typedef char HASHHEX[HASHHEXLEN+1];
static const char *hexchars = "0123456789abcdef";
static void
CvtHex(IN HASH Bin, OUT HASHHEX Hex)
{
unsigned short i;
unsigned char j;
for (i = 0; i < HASHLEN; i++) {
j = (Bin[i] >> 4) & 0xf;
Hex[i*2] = hexchars[j];
j = Bin[i] & 0xf;
Hex[i*2+1] = hexchars[j];
}
Hex[HASHHEXLEN] = '\0';
};
/* calculate H(A1) as per spec */
static void
DigestCalcHA1(
IN char * pszAlg,
IN char * pszUserName,
IN char * pszRealm,
IN char * pszPassword,
IN char * pszNonce,
IN char * pszCNonce,
OUT HASHHEX SessionKey
)
{
MD5_CTX Md5Ctx;
HASH HA1;
MD5Init(&Md5Ctx);
MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName));
MD5Update(&Md5Ctx, ":", 1);
MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm));
MD5Update(&Md5Ctx, ":", 1);
MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword));
MD5Final(HA1, &Md5Ctx);
if (strcasecmp(pszAlg, "md5-sess") == 0) {
MD5Init(&Md5Ctx);
MD5Update(&Md5Ctx, HA1, HASHLEN);
MD5Update(&Md5Ctx, ":", 1);
MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce));
MD5Update(&Md5Ctx, ":", 1);
MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce));
MD5Final(HA1, &Md5Ctx);
}
CvtHex(HA1, SessionKey);
}
/* calculate request-digest/response-digest as per HTTP Digest spec */
static void
DigestCalcResponse(
IN HASHHEX HA1, /* H(A1) */
IN char * pszNonce, /* nonce from server */
IN char * pszNonceCount, /* 8 hex digits */
IN char * pszCNonce, /* client nonce */
IN char * pszQop, /* qop-value: "", "auth", "auth-int" */
IN char * pszMethod, /* method from the request */
IN char * pszDigestUri, /* requested URL */
IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */
OUT HASHHEX Response /* request-digest or response-digest */
)
{
#if 0
DEBUGF("Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n",
HA1, pszNonce, pszQop, pszMethod, pszDigestUri);
#endif
MD5_CTX Md5Ctx;
HASH HA2;
HASH RespHash;
HASHHEX HA2Hex;
// calculate H(A2)
MD5Init(&Md5Ctx);
MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod));
MD5Update(&Md5Ctx, ":", 1);
MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri));
if (strcasecmp(pszQop, "auth-int") == 0) {
MD5Update(&Md5Ctx, ":", 1);
MD5Update(&Md5Ctx, HEntity, HASHHEXLEN);
}
MD5Final(HA2, &Md5Ctx);
CvtHex(HA2, HA2Hex);
// calculate response
MD5Init(&Md5Ctx);
MD5Update(&Md5Ctx, HA1, HASHHEXLEN);
MD5Update(&Md5Ctx, ":", 1);
MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce));
MD5Update(&Md5Ctx, ":", 1);
if (*pszQop) {
MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount));
MD5Update(&Md5Ctx, ":", 1);
MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce));
MD5Update(&Md5Ctx, ":", 1);
MD5Update(&Md5Ctx, pszQop, strlen(pszQop));
MD5Update(&Md5Ctx, ":", 1);
}
MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN);
MD5Final(RespHash, &Md5Ctx);
CvtHex(RespHash, Response);
}
/*
* Generate/Send a Digest authorization header
* This looks like: [Proxy-]Authorization: credentials
*
* credentials = "Digest" digest-response
* digest-response = 1#( username | realm | nonce | digest-uri
* | response | [ algorithm ] | [cnonce] |
* [opaque] | [message-qop] |
* [nonce-count] | [auth-param] )
* username = "username" "=" username-value
* username-value = quoted-string
* digest-uri = "uri" "=" digest-uri-value
* digest-uri-value = request-uri ; As specified by HTTP/1.1
* message-qop = "qop" "=" qop-value
* cnonce = "cnonce" "=" cnonce-value
* cnonce-value = nonce-value
* nonce-count = "nc" "=" nc-value
* nc-value = 8LHEX
* response = "response" "=" request-digest
* request-digest = <"> 32LHEX <">
*/
static int
http_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c,
http_auth_params_t *parms, struct url *url)
{
int r;
char noncecount[10];
char cnonce[40];
char *options = NULL;
if (!c->realm || !c->nonce) {
DEBUGF("realm/nonce not set in challenge\n");
return(-1);
}
if (!c->algo)
c->algo = strdup("");
if (asprintf(&options, "%s%s%s%s",
*c->algo? ",algorithm=" : "", c->algo,
c->opaque? ",opaque=" : "", c->opaque?c->opaque:"") < 0)
return (-1);
if (!c->qop) {
c->qop = strdup("");
*noncecount = 0;
*cnonce = 0;
} else {
c->nc++;
sprintf(noncecount, "%08x", c->nc);
/* We don't try very hard with the cnonce ... */
sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0));
}
HASHHEX HA1;
DigestCalcHA1(c->algo, parms->user, c->realm,
parms->password, c->nonce, cnonce, HA1);
DEBUGF("HA1: [%s]\n", HA1);
HASHHEX digest;
DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop,
"GET", url->doc, "", digest);
if (c->qop[0]) {
r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\","
"nonce=\"%s\",uri=\"%s\",response=\"%s\","
"qop=\"auth\", cnonce=\"%s\", nc=%s%s",
hdr, parms->user, c->realm,
c->nonce, url->doc, digest,
cnonce, noncecount, options);
} else {
r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\","
"nonce=\"%s\",uri=\"%s\",response=\"%s\"%s",
hdr, parms->user, c->realm,
c->nonce, url->doc, digest, options);
}
if (options)
free(options);
return (r);
}
/*
* 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;
DEBUGF("basic: usr: [%s]\n", usr);
DEBUGF("basic: pwd: [%s]\n", pwd);
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", hdr, auth);
free(auth);
return (r);
}
/*
* Chose the challenge to answer and call the appropriate routine to
* produce the header.
*/
static int
http_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs,
http_auth_params_t *parms, struct url *url)
{
http_auth_challenge_t *digest = NULL;
int i;
/* If user or pass are null we're not happy */
if (!parms->user || !parms->password) {
DEBUGF("NULL usr or pass\n");
return (-1);
}
/* Look for a Digest */
for (i = 0; i < cs->count; i++) {
if (cs->challenges[i]->scheme == HTTPAS_DIGEST)
digest = cs->challenges[i];
}
/* Error if "Digest" was specified and there is no Digest challenge */
if (!digest &&
(parms->scheme && strcasecmp(parms->scheme, "digest") == 0)) {
DEBUGF("Digest auth in env, not supported by peer\n");
return (-1);
}
/*
* If "basic" was specified in the environment, or there is no Digest
* challenge, do the basic thing. Don't need a challenge for this,
* so no need to check basic!=NULL
*/
if (!digest ||
(parms->scheme && strcasecmp(parms->scheme, "basic") == 0))
return (http_basic_auth(conn,hdr,parms->user,parms->password));
/* Else, prefer digest. We just checked that it's not NULL */
return (http_digest_auth(conn, hdr, digest, parms, url));
}
/*****************************************************************************
* 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)
{
struct url *curl;
conn_t *conn;
hdr_t h;
http_headerbuf_t headerbuf;
const char *p;
int verbose;
int af, val;
int serrno;
#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 ((conn = fetch_connect(curl->host, curl->port, af, verbose)) == NULL)
/* fetch_connect() has already set an error code */
return (NULL);
init_http_headerbuf(&headerbuf);
if (strcmp(URL->scheme, SCHEME_HTTPS) == 0 && purl) {
http_cmd(conn, "CONNECT %s:%d HTTP/1.1",
URL->host, URL->port);
http_cmd(conn, "Host: %s:%d",
URL->host, URL->port);
http_cmd(conn, "");
if (http_get_reply(conn) != HTTP_OK) {
http_seterr(conn->err);
goto ouch;
}
/* Read and discard the rest of the proxy response */
if (fetch_getln(conn) < 0) {
fetch_syserr();
goto ouch;
}
do {
switch ((h = http_next_header(conn, &headerbuf, &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 (strcmp(URL->scheme, SCHEME_HTTPS) == 0 &&
fetch_ssl(conn, URL, verbose) == -1) {
/* grrr */
errno = EAUTH;
fetch_syserr();
goto ouch;
}
val = 1;
setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val));
clean_http_headerbuf(&headerbuf);
return (conn);
ouch:
serrno = errno;
clean_http_headerbuf(&headerbuf);
fetch_close(conn);
errno = serrno;
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 (strcmp(purl->scheme, SCHEME_HTTP) == 0)
return (purl);
fetchFreeURL(purl);
}
return (NULL);
}
static void
http_print_html(FILE *out, FILE *in)
{
size_t len;
char *line, *p, *q;
int comment, tag;
comment = tag = 0;
while ((line = fgetln(in, &len)) != NULL) {
while (len && isspace((unsigned char)line[len - 1]))
--len;
for (p = q = line; q < line + len; ++q) {
if (comment && *q == '-') {
if (q + 2 < line + len &&
strcmp(q, "-->") == 0) {
tag = comment = 0;
q += 2;
}
} else if (tag && !comment && *q == '>') {
p = q + 1;
tag = 0;
} else if (!tag && *q == '<') {
if (q > p)
fwrite(p, q - p, 1, out);
tag = 1;
if (q + 3 < line + len &&
strcmp(q, "<!--") == 0) {
comment = 1;
q += 3;
}
}
}
if (!tag && q > p)
fwrite(p, q - p, 1, out);
fputc('\n', out);
}
}
/*****************************************************************************
* Core
*/
FILE *
http_request(struct url *URL, const char *op, struct url_stat *us,
struct url *purl, const char *flags)
{
return (http_request_body(URL, op, us, purl, flags, NULL, NULL));
}
/*
* 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.
*/
FILE *
http_request_body(struct url *URL, const char *op, struct url_stat *us,
struct url *purl, const char *flags, const char *content_type,
const char *body)
{
char timebuf[80];
char hbuf[MAXHOSTNAMELEN + 7], *host;
conn_t *conn;
struct url *url, *new;
int chunked, direct, ims, noredirect, verbose;
int e, i, n, val;
off_t offset, clength, length, size;
time_t mtime;
const char *p;
FILE *f;
hdr_t h;
struct tm *timestruct;
http_headerbuf_t headerbuf;
http_auth_challenges_t server_challenges;
http_auth_challenges_t proxy_challenges;
size_t body_len;
/* The following calls don't allocate anything */
init_http_headerbuf(&headerbuf);
init_http_auth_challenges(&server_challenges);
init_http_auth_challenges(&proxy_challenges);
direct = CHECK_FLAG('d');
noredirect = CHECK_FLAG('A');
verbose = CHECK_FLAG('v');
ims = CHECK_FLAG('i');
if (direct && purl) {
fetchFreeURL(purl);
purl = NULL;
}
/* try the provided URL first */
url = URL;
n = MAX_REDIRECT;
i = 0;
e = HTTP_PROTOCOL_ERROR;
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", us, purl, flags));
else if (strcmp(op, "HEAD") == 0)
return (ftp_request(url, "STAT", us, purl, flags));
}
/* connect to server or proxy */
if ((conn = http_connect(url, purl, flags)) == NULL)
goto ouch;
/* append port number only if necessary */
host = url->host;
if (url->port != fetch_default_port(url->scheme)) {
snprintf(hbuf, sizeof(hbuf), "%s:%d", host, url->port);
host = hbuf;
}
/* send request */
if (verbose)
fetch_info("requesting %s://%s%s",
url->scheme, host, url->doc);
if (purl && strcmp(url->scheme, SCHEME_HTTPS) != 0) {
http_cmd(conn, "%s %s://%s%s HTTP/1.1",
op, url->scheme, host, url->doc);
} else {
http_cmd(conn, "%s %s HTTP/1.1",
op, url->doc);
}
if (ims && url->ims_time) {
timestruct = gmtime((time_t *)&url->ims_time);
(void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT",
timestruct);
if (verbose)
fetch_info("If-Modified-Since: %s", timebuf);
http_cmd(conn, "If-Modified-Since: %s", timebuf);
}
/* virtual host */
http_cmd(conn, "Host: %s", host);
/*
* Proxy authorization: we only send auth after we received
* a 407 error. We do not first try basic anyway (changed
* when support was added for digest-auth)
*/
if (purl && proxy_challenges.valid) {
http_auth_params_t aparams;
init_http_auth_params(&aparams);
if (*purl->user || *purl->pwd) {
aparams.user = strdup(purl->user);
aparams.password = strdup(purl->pwd);
} else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL &&
*p != '\0') {
if (http_authfromenv(p, &aparams) < 0) {
http_seterr(HTTP_NEED_PROXY_AUTH);
goto ouch;
}
} else if (fetch_netrc_auth(purl) == 0) {
aparams.user = strdup(purl->user);
aparams.password = strdup(purl->pwd);
}
http_authorize(conn, "Proxy-Authorization",
&proxy_challenges, &aparams, url);
clean_http_auth_params(&aparams);
}
/*
* Server authorization: we never send "a priori"
* Basic auth, which used to be done if user/pass were
* set in the url. This would be weird because we'd send the
* password in the clear even if Digest is finally to be
* used (it would have made more sense for the
* pre-digest version to do this when Basic was specified
* in the environment)
*/
if (server_challenges.valid) {
http_auth_params_t aparams;
init_http_auth_params(&aparams);
if (*url->user || *url->pwd) {
aparams.user = strdup(url->user);
aparams.password = strdup(url->pwd);
} else if ((p = getenv("HTTP_AUTH")) != NULL &&
*p != '\0') {
if (http_authfromenv(p, &aparams) < 0) {
http_seterr(HTTP_NEED_AUTH);
goto ouch;
}
} else if (fetch_netrc_auth(url) == 0) {
aparams.user = strdup(url->user);
aparams.password = strdup(url->pwd);
} else if (fetchAuthMethod &&
fetchAuthMethod(url) == 0) {
aparams.user = strdup(url->user);
aparams.password = strdup(url->pwd);
} else {
http_seterr(HTTP_NEED_AUTH);
goto ouch;
}
http_authorize(conn, "Authorization",
&server_challenges, &aparams, url);
clean_http_auth_params(&aparams);
}
/* other headers */
if ((p = getenv("HTTP_ACCEPT")) != NULL) {
if (*p != '\0')
http_cmd(conn, "Accept: %s", p);
} else {
http_cmd(conn, "Accept: */*");
}
if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') {
if (strcasecmp(p, "auto") == 0)
http_cmd(conn, "Referer: %s://%s%s",
url->scheme, host, url->doc);
else
http_cmd(conn, "Referer: %s", p);
}
if ((p = getenv("HTTP_USER_AGENT")) != NULL) {
/* no User-Agent if defined but empty */
if (*p != '\0')
http_cmd(conn, "User-Agent: %s", p);
} else {
/* default User-Agent */
http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER,
getprogname());
}
if (url->offset > 0)
http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset);
http_cmd(conn, "Connection: close");
if (body) {
body_len = strlen(body);
http_cmd(conn, "Content-Length: %zu", body_len);
if (content_type != NULL)
http_cmd(conn, "Content-Type: %s", content_type);
}
http_cmd(conn, "");
if (body)
fetch_write(conn, body, body_len);
/*
* 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.
*/
val = 0;
setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val,
sizeof(val));
val = 1;
setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val,
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_TEMP_REDIRECT:
case HTTP_PERM_REDIRECT:
case HTTP_SEE_OTHER:
case HTTP_USE_PROXY:
/*
* Not so fine, but we still have to read the
* headers to get the new location.
*/
break;
case HTTP_NEED_AUTH:
if (server_challenges.valid) {
/*
* 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 (proxy_challenges.valid) {
/*
* We already sent our proxy
* 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("proxy requires authorization");
break;
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:
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. http_next_header expects one line readahead */
if (fetch_getln(conn) == -1) {
fetch_syserr();
goto ouch;
}
do {
switch ((h = http_next_header(conn, &headerbuf, &p))) {
case hdr_syserror:
fetch_syserr();
goto ouch;
case hdr_error:
http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
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 the A flag is set, we don't follow
* temporary redirects.
*/
if (noredirect &&
conn->err != HTTP_MOVED_PERM &&
conn->err != HTTP_PERM_REDIRECT &&
conn->err != HTTP_USE_PROXY) {
n = 1;
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 */
DEBUGF("failed to parse new URL\n");
goto ouch;
}
/* Only copy credentials if the host matches */
if (strcmp(new->host, url->host) == 0 &&
!*new->user && !*new->pwd) {
strcpy(new->user, url->user);
strcpy(new->pwd, url->pwd);
}
new->offset = url->offset;
new->length = url->length;
new->ims_time = url->ims_time;
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 (http_parse_authenticate(p, &server_challenges) == 0)
++n;
break;
case hdr_proxy_authenticate:
if (conn->err != HTTP_NEED_PROXY_AUTH)
break;
if (http_parse_authenticate(p, &proxy_challenges) == 0)
++n;
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 ||
conn->err == HTTP_NEED_PROXY_AUTH) {
e = conn->err;
if ((conn->err == HTTP_NEED_AUTH &&
!server_challenges.valid) ||
(conn->err == HTTP_NEED_PROXY_AUTH &&
!proxy_challenges.valid)) {
/* 401/7 but no www/proxy-authenticate ?? */
DEBUGF("%03d without auth header\n", conn->err);
goto ouch;
}
fetch_close(conn);
conn = NULL;
continue;
}
/* requested range not satisfiable */
if (conn->err == HTTP_BAD_RANGE) {
if (url->offset > 0 && url->length == 0) {
/* asked for 0 bytes; fake it */
offset = url->offset;
clength = -1;
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_NOT_MODIFIED
|| conn->err == HTTP_PARTIAL
|| HTTP_ERROR(conn->err))
break;
/* all other cases: we got a redirect */
e = conn->err;
clean_http_auth_challenges(&server_challenges);
fetch_close(conn);
conn = NULL;
if (!new) {
DEBUGF("redirect with no new location\n");
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;
}
DEBUGF("offset %lld, length %lld, size %lld, clength %lld\n",
(long long)offset, (long long)length,
(long long)size, (long long)clength);
if (conn->err == HTTP_NOT_MODIFIED) {
http_seterr(HTTP_NOT_MODIFIED);
return (NULL);
}
/* 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;
/* wrap it up in a FILE */
if ((f = http_funopen(conn, chunked)) == NULL) {
fetch_syserr();
goto ouch;
}
if (url != URL)
fetchFreeURL(url);
if (purl)
fetchFreeURL(purl);
if (HTTP_ERROR(conn->err)) {
http_print_html(stderr, f);
fclose(f);
f = NULL;
}
clean_http_headerbuf(&headerbuf);
clean_http_auth_challenges(&server_challenges);
clean_http_auth_challenges(&proxy_challenges);
return (f);
ouch:
if (url != URL)
fetchFreeURL(url);
if (purl)
fetchFreeURL(purl);
if (conn != NULL)
fetch_close(conn);
clean_http_headerbuf(&headerbuf);
clean_http_auth_challenges(&server_challenges);
clean_http_auth_challenges(&proxy_challenges);
return (NULL);
}
/*****************************************************************************
* Entry points
*/
/*
* Retrieve and stat a file by HTTP
*/
FILE *
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
*/
FILE *
fetchGetHTTP(struct url *URL, const char *flags)
{
return (fetchXGetHTTP(URL, NULL, flags));
}
/*
* Store a file by HTTP
*/
FILE *
fetchPutHTTP(struct url *URL __unused, const char *flags __unused)
{
warnx("fetchPutHTTP(): not implemented");
return (NULL);
}
/*
* Get an HTTP document's metadata
*/
int
fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags)
{
FILE *f;
f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags);
if (f == NULL)
return (-1);
fclose(f);
return (0);
}
/*
* List a directory
*/
struct url_ent *
fetchListHTTP(struct url *url __unused, const char *flags __unused)
{
warnx("fetchListHTTP(): not implemented");
return (NULL);
}
/*
* Arbitrary HTTP verb and content requests
*/
FILE *
fetchReqHTTP(struct url *URL, const char *method, const char *flags,
const char *content_type, const char *body)
{
return (http_request_body(URL, method, NULL, http_get_proxy(URL, flags),
flags, content_type, body));
}
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