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/*-
* Copyright (c) 1998 Dag-Erling Coïdan 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.
*
* $Id$
*/
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <err.h>
#include <ctype.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "fetch.h"
#include "httperr.c"
#ifndef NDEBUG
#define DEBUG(x) do x; while (0)
#else
#define DEBUG(x) do { } while (0)
#endif
extern char *__progname;
extern int fprint64(FILE *f, const unsigned char *buf);
#define ENDL "\r\n"
struct cookie
{
FILE *real_f;
#define ENC_NONE 0
#define ENC_CHUNKED 1
int encoding; /* 1 = chunked, 0 = none */
#define HTTPCTYPELEN 59
char content_type[HTTPCTYPELEN+1];
char *buf;
int b_cur, eof;
unsigned b_len, chunksize;
};
static int
_http_connect(char *host, int port)
{
struct sockaddr_in sin;
struct hostent *he;
int fd;
/* look up host name */
if ((he = gethostbyname(host)) == NULL)
return -1;
/* set up socket address structure */
bzero(&sin, sizeof(sin));
bcopy(he->h_addr, (char *)&sin.sin_addr, he->h_length);
sin.sin_family = he->h_addrtype;
sin.sin_port = htons(port);
/* try to connect */
if ((fd = socket(sin.sin_family, SOCK_STREAM, 0)) < 0)
return -1;
if (connect(fd, (struct sockaddr *)&sin, sizeof sin) < 0) {
close(fd);
return -1;
}
return fd;
}
static char *
_http_fillbuf(struct cookie *c)
{
char *ln;
unsigned int len;
if (c->eof)
return NULL;
if (c->encoding == ENC_NONE) {
c->buf = fgetln(c->real_f, &(c->b_len));
c->b_cur = 0;
} else if (c->encoding == ENC_CHUNKED) {
if (c->chunksize == 0) {
ln = fgetln(c->real_f, &len);
DEBUG(fprintf(stderr, "\033[1m_http_fillbuf(): new chunk: "
"%*.*s\033[m\n", (int)len-2, (int)len-2, ln));
sscanf(ln, "%x", &(c->chunksize));
if (!c->chunksize) {
DEBUG(fprintf(stderr, "\033[1m_http_fillbuf(): "
"end of last chunk\033[m\n"));
c->eof = 1;
return NULL;
}
DEBUG(fprintf(stderr, "\033[1m_http_fillbuf(): "
"new chunk: %X\033[m\n", c->chunksize));
}
c->buf = fgetln(c->real_f, &(c->b_len));
if (c->b_len > c->chunksize)
c->b_len = c->chunksize;
c->chunksize -= c->b_len;
c->b_cur = 0;
}
else return NULL; /* unknown encoding */
return c->buf;
}
static int
_http_readfn(struct cookie *c, char *buf, int len)
{
int l, pos = 0;
while (len) {
/* empty buffer */
if (!c->buf || (c->b_cur == c->b_len))
if (!_http_fillbuf(c))
break;
l = c->b_len - c->b_cur;
if (len < l) l = len;
memcpy(buf + pos, c->buf + c->b_cur, l);
c->b_cur += l;
pos += l;
len -= l;
}
if (ferror(c->real_f))
return -1;
else return pos;
}
static int
_http_writefn(struct cookie *c, const char *buf, int len)
{
size_t r = fwrite(buf, 1, (size_t)len, c->real_f);
return r ? r : -1;
}
static int
_http_closefn(struct cookie *c)
{
int r = fclose(c->real_f);
free(c);
return (r == EOF) ? -1 : 0;
}
char *
fetchContentType(FILE *f)
{
/*
* We have no way of making sure this really *is* one of our cookies,
* so just check for a null pointer and hope for the best.
*/
return f->_cookie ? (((struct cookie *)f->_cookie)->content_type) : NULL;
}
FILE *
fetchGetHTTP(url_t *URL, char *flags)
{
int fd = -1, err, i, enc = ENC_NONE;
struct cookie *c;
char *ln, *p, *q;
FILE *f, *cf;
size_t len;
/* allocate cookie */
if ((c = calloc(1, sizeof(struct cookie))) == NULL)
return NULL;
/* check port */
if (!URL->port)
URL->port = 80; /* default HTTP port */
/* attempt to connect to proxy server */
if (getenv("HTTP_PROXY")) {
char *px, host[MAXHOSTNAMELEN];
int port = 3128; /* XXX I think 3128 is default... check? */
size_t len;
/* measure length */
px = getenv("HTTP_PROXY");
len = strcspn(px, ":");
/* get port (atoi is a little too tolerant perhaps?) */
if (px[len] == ':')
port = atoi(px+len+1);
/* get host name */
if (len >= MAXHOSTNAMELEN)
len = MAXHOSTNAMELEN - 1;
strncpy(host, px, len);
host[len] = 0;
/* connect */
fd = _http_connect(host, port);
}
/* if no proxy is configured or could be contacted, try direct */
if (fd < 0) {
if ((fd = _http_connect(URL->host, URL->port)) < 0)
goto ouch;
}
/* reopen as stream */
if ((f = fdopen(fd, "r+")) == NULL)
goto ouch;
c->real_f = f;
/* send request (proxies require absolute form, so use that) */
fprintf(f, "GET http://%s:%d/%s HTTP/1.1" ENDL,
URL->host, URL->port, URL->doc);
/* start sending headers away */
if (URL->user[0] || URL->pwd[0]) {
fprintf(f, "Authorization: Basic ");
fprint64(f, (const unsigned char *)URL->user);
fputc(':', f);
fprint64(f, (const unsigned char *)URL->pwd);
fputs(ENDL, f);
}
fprintf(f, "Host: %s:%d" ENDL, URL->host, URL->port);
fprintf(f, "User-Agent: %s " _LIBFETCH_VER ENDL, __progname);
fprintf(f, "Connection: close" ENDL ENDL);
/* get response */
if ((ln = fgetln(f, &len)) == NULL)
goto fouch;
DEBUG(fprintf(stderr, "response: [\033[1m%*.*s\033[m]\n",
(int)len-2, (int)len-2, ln));
/* we can't use strchr() and friends since ln isn't NUL-terminated */
p = ln;
while ((p < ln + len) && !isspace(*p))
p++;
while ((p < ln + len) && !isdigit(*p))
p++;
if (!isdigit(*p))
goto fouch;
err = atoi(p);
DEBUG(fprintf(stderr, "code: [\033[1m%d\033[m]\n", err));
/* add code to handle redirects later */
if (err != 200)
goto fouch;
/* browse through header */
while (1) {
if ((ln = fgetln(f, &len)) == NULL)
goto fouch;
if ((ln[0] == '\r') || (ln[0] == '\n'))
break;
DEBUG(fprintf(stderr, "header: [\033[1m%*.*s\033[m]\n",
(int)len-2, (int)len-2, ln));
#define XFERENC "Transfer-Encoding:"
if (strncasecmp(ln, XFERENC, sizeof(XFERENC)-1) == 0) {
p = ln + sizeof(XFERENC) - 1;
while ((p < ln + len) && isspace(*p))
p++;
for (q = p; (q < ln + len) && !isspace(*q); q++)
/* VOID */ ;
*q = 0;
if (strcasecmp(p, "chunked") == 0)
enc = ENC_CHUNKED;
DEBUG(fprintf(stderr, "xferenc: [\033[1m%s\033[m]\n", p));
#undef XFERENC
#define CONTTYPE "Content-Type:"
} else if (strncasecmp(ln, CONTTYPE, sizeof(CONTTYPE)-1) == 0) {
p = ln + sizeof(CONTTYPE) - 1;
while ((p < ln + len) && isspace(*p))
p++;
for (i = 0; p < ln + len; p++)
if (i < HTTPCTYPELEN)
c->content_type[i++] = *p;
do c->content_type[i--] = 0; while (isspace(c->content_type[i]));
DEBUG(fprintf(stderr, "conttype: [\033[1m%s\033[m]\n",
c->content_type));
#undef CONTTYPE
}
}
/* only body remains */
c->encoding = enc;
cf = funopen(c,
(int (*)(void *, char *, int))_http_readfn,
(int (*)(void *, const char *, int))_http_writefn,
(fpos_t (*)(void *, fpos_t, int))NULL,
(int (*)(void *))_http_closefn);
if (cf == NULL)
goto fouch;
return cf;
ouch:
if (fd >= 0)
close(fd);
free(c);
return NULL;
fouch:
fclose(f);
free(c);
return NULL;
}
FILE *
fetchPutHTTP(url_t *URL, char *flags)
{
warnx("fetchPutHTTP(): not implemented");
return NULL;
}
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