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freebsd-dev/lib/libfetch/http.c
Pedro F. Giffuni 5e53a4f90f lib: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-26 02:00:33 +00:00

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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")) {
cs->challenges[cs->count]->scheme = HTTPAS_BASIC;
} else if (!strcasecmp(key, "digest")) {
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"))
cs->challenges[cs->count]->realm =
strdup(value);
else if (!strcasecmp(key, "qop"))
cs->challenges[cs->count]->qop =
strdup(value);
else if (!strcasecmp(key, "nonce"))
cs->challenges[cs->count]->nonce =
strdup(value);
else if (!strcasecmp(key, "opaque"))
cs->challenges[cs->count]->opaque =
strdup(value);
else if (!strcasecmp(key, "algorithm"))
cs->challenges[cs->count]->algo =
strdup(value);
else if (!strcasecmp(key, "stale"))
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);
DEBUG(fprintf(stderr, "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);
DEBUG(fprintf(stderr, "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) {
DEBUG(fprintf(stderr, "content range: [*/%lld]\n",
(long long)len));
*length = 0;
} else {
DEBUG(fprintf(stderr, "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 */
)
{
/* DEBUG(fprintf(stderr,
"Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n",
HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/
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) {
DEBUG(fprintf(stderr, "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:"")== -1)
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);
DEBUG(fprintf(stderr, "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;
DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr));
DEBUG(fprintf(stderr, "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) {
DEBUG(fprintf(stderr, "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"))) {
DEBUG(fprintf(stderr,
"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")))
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 (strcasecmp(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 (strcasecmp(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 (strcasecmp(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 && strcasecmp(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 */
DEBUG(fprintf(stderr, "failed to parse new URL\n"));
goto ouch;
}
/* Only copy credentials if the host matches */
if (!strcmp(new->host, url->host) && !*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 (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 ?? */
DEBUG(fprintf(stderr, "401/7 and no auth header\n"));
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) {
DEBUG(fprintf(stderr, "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;
}
DEBUG(fprintf(stderr, "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);
}
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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