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drvrnet.c
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/* This file, drvrhttp.c contains driver routines for http, ftp and root
files. */
/* This file was written by Bruce O'Neel at the ISDC, Switzerland */
/* The FITSIO software is maintained by William Pence at the High Energy */
/* Astrophysic Science Archive Research Center (HEASARC) at the NASA */
/* Goddard Space Flight Center. */
/* Notes on the drivers:
The ftp driver uses passive mode exclusivly. If your remote system can't
deal with passive mode then it'll fail. Since Netscape Navigator uses
passive mode as well there shouldn't be too many ftp servers which have
problems.
The http driver works properly with 301 and 302 redirects. For many more
gory details see http://www.w3c.org/Protocols/rfc2068/rfc2068. The only
catch to the 301/302 redirects is that they have to redirect to another
http:// url. If not, things would have to change a lot in cfitsio and this
was thought to be too difficult.
Redirects look like
<HTML><HEAD>
<TITLE>301 Moved Permanently</TITLE>
</HEAD><BODY>
<H1>Moved Permanently</H1>
The document has moved <A HREF="http://heasarc.gsfc.nasa.gov/FTP/software/ftools/release/other/image.fits.gz">here</A>.<P>
</BODY></HTML>
This redirect was from apache 1.2.5 but most of the other servers produce
something very similiar. The parser for the redirects finds the first
anchor <A> tag in the body and goes there. If that wasn't what was intended
by the remote system then hopefully the error stack, which includes notes
about the redirect will help the user fix the problem.
Root protocal doesn't have any real docs, so, the emperical docs are as
follows.
First, you must use a slightly modified rootd server. The modifications
include implimentation of the stat command which returns the size of the
remote file. Without that it's impossible for cfitsio to work properly
since fitsfiles don't include any information about the size of the files
in the headers. The rootd server closes the connections on any errors,
including reading beyond the end of the file or seeking beyond the end
of the file. The rootd:// driver doesn't reopen a closed connection, if
the connection is closed you're pretty much done.
The messages are of the form
<len><opcode><optional information>
All binary information is transfered in network format, so use htonl and
ntohl to convert back and forth.
<len> :== 4 byte length, in network format, the len doesn't include the
length of <len>
<opcode> :== one of the message opcodes below, 4 bytes, network format
<optional info> :== depends on opcode
The response is of the same form with the same opcode sent. Success is
indicated by <optional info> being 0.
Root is a NFSish protocol where each read/write includes the byte
offset to read or write to. As a result, seeks will always succeed
in the driver even if they would cause a fatal error when you try
to read because you're beyond the end of the file.
There is file locking on the host such that you need to possibly
create /usr/tmp/rootdtab on the host system. There is one file per
socket connection, though the rootd daemon can support multiple
files open at once.
The messages are sent in the following order:
ROOTD_USER - user name, <optional info> is the user name, trailing
null is sent though it's not required it seems. A ROOTD_AUTH
message is returned with any sort of error meaning that the user
name is wrong.
ROOTD_PASS - password, ones complemented, stored in <optional info>. Once
again the trailing null is sent. Once again a ROOTD_AUTH message is
returned
ROOTD_OPEN - <optional info> includes filename and one of
{create|update|read} as the file mode. ~ seems to be dealt with
as the username's login directory. A ROOTD_OPEN message is
returned.
Once the file is opened any of the following can be sent:
ROOTD_STAT - file status and size
returns a message where <optional info> is the file length in bytes
ROOTD_FLUSH - flushes the file, not sure this has any real effect
on the daemon since the daemon uses open/read/write/close rather
than the buffered fopen/fread/fwrite/fclose.
ROOTD_GET - on send <optional info> includes a text message of
offset and length to get. Return is a status message first with a
status value, then, the raw bytes for the length that you
requested. It's an error to seek or read past the end of the file,
and, the rootd daemon exits and won't respond anymore. Ie, don't
do this.
ROOTD_PUT - on send <optional info> includes a text message of
offset and length to put. Then send the raw bytes you want to
write. Then recieve a status message
When you are finished then you send the message:
ROOTD_CLOSE - closes the file
Once the file is closed then the socket is closed.
Revision 1.56 2000/01/04 11:58:31 oneel
Updates so that compressed network files are dealt with regardless of
their file names and/or mime types.
Revision 1.55 2000/01/04 10:52:40 oneel
cfitsio 2.034
Revision 1.51 1999/08/10 12:13:40 oneel
Make the http code a bit less picky about the types of files it
uncompresses. Now it also uncompresses files which end in .Z or .gz.
Revision 1.50 1999/08/04 12:38:46 oneel
Don's 2.0.32 patch with dal 1.3
Revision 1.39 1998/12/02 15:31:33 oneel
Updates to drvrnet.c so that less compiler warnings would be
generated. Fixes the signal handling.
Revision 1.38 1998/11/23 10:03:24 oneel
Added in a useragent string, as suggested by:
Tim Kimball · Data Systems Division ¦ [email protected] · 410-338-4417
Space Telescope Science Institute ¦ http://www.stsci.edu/~kimball/
3700 San Martin Drive ¦ http://archive.stsci.edu/
Baltimore MD 21218 USA ¦ http://faxafloi.stsci.edu:4547/
*/
#ifdef HAVE_NET_SERVICES
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#if defined(unix) || defined(__unix__) || defined(__unix)
#include <unistd.h>
#endif
#include <signal.h>
#include <setjmp.h>
#include "fitsio2.h"
static jmp_buf env; /* holds the jump buffer for setjmp/longjmp pairs */
static void signal_handler(int sig);
/* Network routine error codes */
#define NET_OK 0
#define NOT_INET_ADDRESS -1000
#define UNKNOWN_INET_HOST -1001
#define CONNECTION_ERROR -1002
/* Network routine constants */
#define NET_DEFAULT 0
#define NET_OOB 1
#define NET_PEEK 2
#define NETTIMEOUT 180 /* in secs */
/* local defines and variables */
#define MAXLEN 1200
#define SHORTLEN 100
static char netoutfile[MAXLEN];
#define ROOTD_USER 2000 /*user id follows */
#define ROOTD_PASS 2001 /*passwd follows */
#define ROOTD_AUTH 2002 /*authorization status (to client) */
#define ROOTD_FSTAT 2003 /*filename follows */
#define ROOTD_OPEN 2004 /*filename follows + mode */
#define ROOTD_PUT 2005 /*offset, number of bytes and buffer */
#define ROOTD_GET 2006 /*offset, number of bytes */
#define ROOTD_FLUSH 2007 /*flush file */
#define ROOTD_CLOSE 2008 /*close file */
#define ROOTD_STAT 2009 /*return rootd statistics */
#define ROOTD_ACK 2010 /*acknowledgement (all OK) */
#define ROOTD_ERR 2011 /*error code and message follow */
typedef struct /* structure containing disk file structure */
{
int sock;
LONGLONG currentpos;
} rootdriver;
static rootdriver handleTable[NMAXFILES]; /* allocate diskfile handle tables */
/* static prototypes */
static int NET_TcpConnect(char *hostname, int port);
static int NET_SendRaw(int sock, const void *buf, int length, int opt);
static int NET_RecvRaw(int sock, void *buffer, int length);
static int NET_ParseUrl(const char *url, char *proto, char *host, int *port,
char *fn);
static int CreateSocketAddress(struct sockaddr_in *sockaddrPtr,
char *host,int port);
static int ftp_status(FILE *ftp, char *statusstr);
static int http_open_network(char *url, FILE **httpfile, char *contentencoding,
int *contentlength);
static int ftp_open_network(char *url, FILE **ftpfile, FILE **command,
int *sock);
static int root_send_buffer(int sock, int op, char *buffer, int buflen);
static int root_recv_buffer(int sock, int *op, char *buffer,int buflen);
static int root_openfile(char *filename, char *rwmode, int *sock);
static int encode64(unsigned s_len, char *src, unsigned d_len, char *dst);
/***************************/
/* Static variables */
static int closehttpfile;
static int closememfile;
static int closefdiskfile;
static int closediskfile;
static int closefile;
static int closeoutfile;
static int closecommandfile;
static int closeftpfile;
static FILE *diskfile;
static FILE *outfile;
/*--------------------------------------------------------------------------*/
/* This creates a memory file handle with a copy of the URL in filename. The
file is uncompressed if necessary */
int http_open(char *filename, int rwmode, int *handle)
{
FILE *httpfile;
char contentencoding[SHORTLEN];
char newfilename[MAXLEN];
char errorstr[MAXLEN];
char recbuf[MAXLEN];
long len;
int contentlength;
int status;
char firstchar;
closehttpfile = 0;
closememfile = 0;
/* don't do r/w files */
if (rwmode != 0) {
ffpmsg("Can't open http:// type file with READWRITE access");
ffpmsg(" Specify an outfile for r/w access (http_open)");
goto error;
}
/* do the signal handler bits */
if (setjmp(env) != 0) {
/* feels like the second time */
/* this means something bad happened */
ffpmsg("Timeout (http_open)");
goto error;
}
(void) signal(SIGALRM, signal_handler);
/* Open the network connection */
/* Does the file have a .Z or .gz in it */
/* Also, if file has a '?' in it (probably cgi script) */
if (strstr(filename,".Z") || strstr(filename,".gz") ||
strstr(filename,"?")) {
alarm(NETTIMEOUT);
if (http_open_network(filename,&httpfile,contentencoding,
&contentlength)) {
alarm(0);
ffpmsg("Unable to open http file (http_open):");
ffpmsg(filename);
goto error;
}
} else {
if (strlen(filename) >= MAXLEN - 4) {
ffpmsg("http file name is too long (http_open)");
ffpmsg(filename);
goto error;
}
alarm(NETTIMEOUT);
/* Try the .gz one */
strcpy(newfilename,filename);
strcat(newfilename,".gz");
if (http_open_network(newfilename,&httpfile,contentencoding,
&contentlength)) {
alarm(0);
/* Now the .Z one */
strcpy(newfilename,filename);
strcat(newfilename,".Z");
alarm(NETTIMEOUT);
if (http_open_network(newfilename,&httpfile,contentencoding,
&contentlength)) {
alarm(0);
alarm(NETTIMEOUT);
if (http_open_network(filename,&httpfile,contentencoding,
&contentlength)) {
alarm(0);
ffpmsg("Unable to open http file (http_open)");
ffpmsg(filename);
goto error;
}
}
}
}
closehttpfile++;
/* Create the memory file */
if ((status = mem_create(filename,handle))) {
ffpmsg("Unable to create memory file (http_open)");
goto error;
}
closememfile++;
/* Now, what do we do with the file */
/* Check to see what the first character is */
firstchar = fgetc(httpfile);
ungetc(firstchar,httpfile);
if (!strcmp(contentencoding,"x-gzip") ||
!strcmp(contentencoding,"x-compress") ||
strstr(filename,".gz") ||
strstr(filename,".Z") ||
('\037' == firstchar)) {
/* do the compress dance, which is the same as the gzip dance */
/* Using the cfitsio routine */
status = 0;
/* Ok, this is a tough case, let's be arbritary and say 10*NETTIMEOUT,
Given the choices for nettimeout above they'll probaby ^C before, but
it's always worth a shot*/
alarm(NETTIMEOUT*10);
status = mem_uncompress2mem(filename, httpfile, *handle);
alarm(0);
if (status) {
ffpmsg("Error writing compressed memory file (http_open)");
ffpmsg(filename);
goto error;
}
} else {
/* It's not compressed, bad choice, but we'll copy it anyway */
if (contentlength % 2880) {
sprintf(errorstr,"Content-Length not a multiple of 2880 (http_open) %d",
contentlength);
ffpmsg(errorstr);
}
/* write a memory file */
alarm(NETTIMEOUT);
while(0 != (len = fread(recbuf,1,MAXLEN,httpfile))) {
alarm(0); /* cancel alarm */
status = mem_write(*handle,recbuf,len);
if (status) {
ffpmsg("Error copying http file into memory (http_open)");
ffpmsg(filename);
goto error;
}
alarm(NETTIMEOUT); /* rearm the alarm */
}
}
fclose(httpfile);
signal(SIGALRM, SIG_DFL);
alarm(0);
return mem_seek(*handle,0);
error:
alarm(0); /* clear it */
if (closehttpfile) {
fclose(httpfile);
}
if (closememfile) {
mem_close_free(*handle);
}
signal(SIGALRM, SIG_DFL);
return (FILE_NOT_OPENED);
}
/*--------------------------------------------------------------------------*/
/* This creates a memory file handle with a copy of the URL in filename. The
file must be compressed and is copied (still compressed) to disk first.
The compressed disk file is then uncompressed into memory (READONLY).
*/
int http_compress_open(char *url, int rwmode, int *handle)
{
FILE *httpfile;
char contentencoding[SHORTLEN];
char recbuf[MAXLEN];
long len;
int contentlength;
int ii, flen, status;
char firstchar;
closehttpfile = 0;
closediskfile = 0;
closefdiskfile = 0;
closememfile = 0;
/* cfileio made a mistake, should set the netoufile first otherwise
we don't know where to write the output file */
flen = strlen(netoutfile);
if (!flen) {
ffpmsg
("Output file not set, shouldn't have happened (http_compress_open)");
goto error;
}
if (rwmode != 0) {
ffpmsg("Can't open compressed http:// type file with READWRITE access");
ffpmsg(" Specify an UNCOMPRESSED outfile (http_compress_open)");
goto error;
}
/* do the signal handler bits */
if (setjmp(env) != 0) {
/* feels like the second time */
/* this means something bad happened */
ffpmsg("Timeout (http_open)");
goto error;
}
signal(SIGALRM, signal_handler);
/* Open the http connectin */
alarm(NETTIMEOUT);
if ((status = http_open_network(url,&httpfile,contentencoding,
&contentlength))) {
alarm(0);
ffpmsg("Unable to open http file (http_compress_open)");
ffpmsg(url);
goto error;
}
closehttpfile++;
/* Better be compressed */
firstchar = fgetc(httpfile);
ungetc(firstchar,httpfile);
if (!strcmp(contentencoding,"x-gzip") ||
!strcmp(contentencoding,"x-compress") ||
('\037' == firstchar)) {
if (*netoutfile == '!')
{
/* user wants to clobber file, if it already exists */
for (ii = 0; ii < flen; ii++)
netoutfile[ii] = netoutfile[ii + 1]; /* remove '!' */
status = file_remove(netoutfile);
}
/* Create the new file */
if ((status = file_create(netoutfile,handle))) {
ffpmsg("Unable to create output disk file (http_compress_open):");
ffpmsg(netoutfile);
goto error;
}
closediskfile++;
/* write a file */
alarm(NETTIMEOUT);
while(0 != (len = fread(recbuf,1,MAXLEN,httpfile))) {
alarm(0);
status = file_write(*handle,recbuf,len);
if (status) {
ffpmsg("Error writing disk file (http_compres_open)");
ffpmsg(netoutfile);
goto error;
}
alarm(NETTIMEOUT);
}
file_close(*handle);
fclose(httpfile);
closehttpfile--;
closediskfile--;
/* File is on disk, let's uncompress it into memory */
if (NULL == (diskfile = fopen(netoutfile,"r"))) {
ffpmsg("Unable to reopen disk file (http_compress_open)");
ffpmsg(netoutfile);
goto error;
}
closefdiskfile++;
/* Create the memory handle to hold it */
if ((status = mem_create(url,handle))) {
ffpmsg("Unable to create memory file (http_compress_open)");
goto error;
}
closememfile++;
/* Uncompress it */
status = 0;
status = mem_uncompress2mem(url,diskfile,*handle);
fclose(diskfile);
closefdiskfile--;
if (status) {
ffpmsg("Error uncompressing disk file to memory (http_compress_open)");
ffpmsg(netoutfile);
goto error;
}
} else {
/* Opps, this should not have happened */
ffpmsg("Can only have compressed files here (http_compress_open)");
goto error;
}
signal(SIGALRM, SIG_DFL);
alarm(0);
return mem_seek(*handle,0);
error:
alarm(0); /* clear it */
if (closehttpfile) {
fclose(httpfile);
}
if (closefdiskfile) {
fclose(diskfile);
}
if (closememfile) {
mem_close_free(*handle);
}
if (closediskfile) {
file_close(*handle);
}
signal(SIGALRM, SIG_DFL);
return (FILE_NOT_OPENED);
}
/*--------------------------------------------------------------------------*/
/* This creates a file handle with a copy of the URL in filename. The http
file is copied to disk first. If it's compressed then it is
uncompressed when copying to the disk */
int http_file_open(char *url, int rwmode, int *handle)
{
FILE *httpfile;
char contentencoding[SHORTLEN];
char errorstr[MAXLEN];
char recbuf[MAXLEN];
long len;
int contentlength;
int ii, flen, status;
char firstchar;
/* Check if output file is actually a memory file */
if (!strncmp(netoutfile, "mem:", 4) )
{
/* allow the memory file to be opened with write access */
return( http_open(url, READONLY, handle) );
}
closehttpfile = 0;
closefile = 0;
closeoutfile = 0;
/* cfileio made a mistake, we need to know where to write the file */
flen = strlen(netoutfile);
if (!flen) {
ffpmsg("Output file not set, shouldn't have happened (http_file_open)");
return (FILE_NOT_OPENED);
}
/* do the signal handler bits */
if (setjmp(env) != 0) {
/* feels like the second time */
/* this means something bad happened */
ffpmsg("Timeout (http_open)");
goto error;
}
signal(SIGALRM, signal_handler);
/* Open the network connection */
alarm(NETTIMEOUT);
if ((status = http_open_network(url,&httpfile,contentencoding,
&contentlength))) {
alarm(0);
ffpmsg("Unable to open http file (http_file_open)");
ffpmsg(url);
goto error;
}
closehttpfile++;
if (*netoutfile == '!')
{
/* user wants to clobber disk file, if it already exists */
for (ii = 0; ii < flen; ii++)
netoutfile[ii] = netoutfile[ii + 1]; /* remove '!' */
status = file_remove(netoutfile);
}
firstchar = fgetc(httpfile);
ungetc(firstchar,httpfile);
if (!strcmp(contentencoding,"x-gzip") ||
!strcmp(contentencoding,"x-compress") ||
('\037' == firstchar)) {
/* to make this more cfitsioish we use the file driver calls to create
the disk file */
/* Create the output file */
if ((status = file_create(netoutfile,handle))) {
ffpmsg("Unable to create output file (http_file_open)");
ffpmsg(netoutfile);
goto error;
}
file_close(*handle);
if (NULL == (outfile = fopen(netoutfile,"w"))) {
ffpmsg("Unable to reopen the output file (http_file_open)");
ffpmsg(netoutfile);
goto error;
}
closeoutfile++;
status = 0;
/* Ok, this is a tough case, let's be arbritary and say 10*NETTIMEOUT,
Given the choices for nettimeout above they'll probaby ^C before, but
it's always worth a shot*/
alarm(NETTIMEOUT*10);
status = uncompress2file(url,httpfile,outfile,&status);
alarm(0);
if (status) {
ffpmsg("Error uncompressing http file to disk file (http_file_open)");
ffpmsg(url);
ffpmsg(netoutfile);
goto error;
}
fclose(outfile);
closeoutfile--;
} else {
/* Create the output file */
if ((status = file_create(netoutfile,handle))) {
ffpmsg("Unable to create output file (http_file_open)");
ffpmsg(netoutfile);
goto error;
}
/* Give a warning message. This could just be bad padding at the end
so don't treat it like an error. */
closefile++;
if (contentlength % 2880) {
sprintf(errorstr,
"Content-Length not a multiple of 2880 (http_file_open) %d",
contentlength);
ffpmsg(errorstr);
}
/* write a file */
alarm(NETTIMEOUT);
while(0 != (len = fread(recbuf,1,MAXLEN,httpfile))) {
alarm(0);
status = file_write(*handle,recbuf,len);
if (status) {
ffpmsg("Error copying http file to disk file (http_file_open)");
ffpmsg(url);
ffpmsg(netoutfile);
goto error;
}
}
file_close(*handle);
closefile--;
}
fclose(httpfile);
closehttpfile--;
signal(SIGALRM, SIG_DFL);
alarm(0);
return file_open(netoutfile,rwmode,handle);
error:
alarm(0); /* clear it */
if (closehttpfile) {
fclose(httpfile);
}
if (closeoutfile) {
fclose(outfile);
}
if (closefile) {
file_close(*handle);
}
signal(SIGALRM, SIG_DFL);
return (FILE_NOT_OPENED);
}
/*--------------------------------------------------------------------------*/
/* This is the guts of the code to get a file via http.
url is the input url
httpfile is set to be the file connected to the socket which you can
read the file from
contentencoding is the mime type of the file, returned if the http server
returns it
contentlength is the lenght of the file, returned if the http server returns
it
*/
static int http_open_network(char *url, FILE **httpfile, char *contentencoding,
int *contentlength)
{
int status;
int sock;
int tmpint;
char recbuf[MAXLEN];
char tmpstr[MAXLEN];
char tmpstr1[SHORTLEN];
char tmpstr2[MAXLEN];
char errorstr[MAXLEN];
char proto[SHORTLEN];
char host[SHORTLEN];
char userpass[MAXLEN];
char fn[MAXLEN];
char turl[MAXLEN];
char *scratchstr;
int port;
float version;
char pproto[SHORTLEN];
char phost[SHORTLEN]; /* address of the proxy server */
int pport; /* port number of the proxy server */
char pfn[MAXLEN];
char *proxy; /* URL of the proxy server */
/* Parse the URL apart again */
strcpy(turl,"http://");
strncat(turl,url,MAXLEN - 8);
if (NET_ParseUrl(turl,proto,host,&port,fn)) {
sprintf(errorstr,"URL Parse Error (http_open) %s",url);
ffpmsg(errorstr);
return (FILE_NOT_OPENED);
}
/* Do we have a user:password combo ? */
strcpy(userpass, url);
if ((scratchstr = strchr(userpass, '@')) != NULL) {
*scratchstr = '\0';
} else
strcpy(userpass, "");
/* Ph. Prugniel 2003/04/03
Are we using a proxy?
We use a proxy if the environment variable "http_proxy" is set to an
address, eg. http://wwwcache.nottingham.ac.uk:3128
("http_proxy" is also used by wget)
*/
proxy = getenv("http_proxy");
/* Connect to the remote host */
if (proxy) {
if (NET_ParseUrl(proxy,pproto,phost,&pport,pfn)) {
sprintf(errorstr,"URL Parse Error (http_open) %s",proxy);
ffpmsg(errorstr);
return (FILE_NOT_OPENED);
}
sock = NET_TcpConnect(phost,pport);
}
else
sock = NET_TcpConnect(host,port);
if (sock < 0) {
if (proxy) {
ffpmsg("Couldn't connect to host via proxy server (http_open_network)");
ffpmsg(proxy);
}
return (FILE_NOT_OPENED);
}
/* Make the socket a stdio file */
if (NULL == (*httpfile = fdopen(sock,"r"))) {
ffpmsg ("fdopen failed to convert socket to file (http_open_network)");
close(sock);
return (FILE_NOT_OPENED);
}
/* Send the GET request to the remote server */
/* Ph. Prugniel 2003/04/03
One must add the Host: command because of HTTP 1.1 servers (ie. virtual
hosts) */
if (proxy)
sprintf(tmpstr,"GET http://%s:%-d%s HTTP/1.0\r\n",host,port,fn);
else
sprintf(tmpstr,"GET %s HTTP/1.0\r\n",fn);
if (strcmp(userpass, "")) {
encode64(strlen(userpass), userpass, MAXLEN, tmpstr2);
sprintf(tmpstr1, "Authorization: Basic %s\r\n", tmpstr2);
if (strlen(tmpstr) + strlen(tmpstr1) > MAXLEN - 1)
return (FILE_NOT_OPENED);
strcat(tmpstr,tmpstr1);
}
sprintf(tmpstr1,"User-Agent: HEASARC/CFITSIO/%-8.3f\r\n",ffvers(&version));
if (strlen(tmpstr) + strlen(tmpstr1) > MAXLEN - 1)
return (FILE_NOT_OPENED);
strcat(tmpstr,tmpstr1);
/* HTTP 1.1 servers require the following 'Host: ' string */
sprintf(tmpstr1,"Host: %s:%-d\r\n\r\n",host,port);
if (strlen(tmpstr) + strlen(tmpstr1) > MAXLEN - 1)
return (FILE_NOT_OPENED);
strcat(tmpstr,tmpstr1);
status = NET_SendRaw(sock,tmpstr,strlen(tmpstr),NET_DEFAULT);
/* read the header */
if (!(fgets(recbuf,MAXLEN,*httpfile))) {
sprintf (errorstr,"http header short (http_open_network) %s",recbuf);
ffpmsg(errorstr);
fclose(*httpfile);
return (FILE_NOT_OPENED);
}
*contentlength = 0;
contentencoding[0] = '\0';
/* Our choices are 200, ok, 301, temporary redirect, or 302 perm redirect */
sscanf(recbuf,"%s %d",tmpstr,&status);
if (status != 200){
if (status == 301 || status == 302) {
/* got a redirect */
if (status == 301) {
ffpmsg("Note: Web server replied with a temporary redirect from");
} else {
ffpmsg("Note: Web server replied with a redirect from");
}
ffpmsg(turl);
/* now, let's not write the most sophisticated parser here */
while (fgets(recbuf,MAXLEN,*httpfile)) {
scratchstr = strstr(recbuf,"<A HREF=\"");
if (scratchstr != NULL) {
/* Ok, we found the beginning of the anchor */
scratchstr += 9; /* skip the <A HREF=" bits */
scratchstr += 7; /* skip http://, we die if it's really ftp:// */
strcpy(turl,strtok(scratchstr,"\""));
sprintf(errorstr,"to %s\n",turl);
ffpmsg(errorstr);
fclose (*httpfile);
return
http_open_network(turl,httpfile,contentencoding,contentlength);
}
}
/* if we get here then we couldnt' decide the redirect */
ffpmsg("but we were unable to find the redirected url in the servers response");
}
/* sprintf(errorstr,
"(http_open_network) Status not 200, was %d\nLine was %s\n",
status,recbuf);
ffpmsg(errorstr);
*/
fclose(*httpfile);
return (FILE_NOT_OPENED);
}
/* from here the first word holds the keyword we want */
/* so, read the rest of the header */
while (fgets(recbuf,MAXLEN,*httpfile)) {
/* Blank line ends the header */
if (*recbuf == '\r') break;
if (strlen(recbuf) > 3) {
recbuf[strlen(recbuf)-1] = '\0';
recbuf[strlen(recbuf)-1] = '\0';
}
sscanf(recbuf,"%s %d",tmpstr,&tmpint);
/* Did we get a content-length header ? */
if (!strcmp(tmpstr,"Content-Length:")) {
*contentlength = tmpint;
}
/* Did we get the content-encoding header ? */
if (!strcmp(tmpstr,"Content-Encoding:")) {
if (NULL != (scratchstr = strstr(recbuf,":"))) {
/* Found the : */
scratchstr++; /* skip the : */
scratchstr++; /* skip the extra space */
strcpy(contentencoding,scratchstr);
}
}
}
/* we're done, so return */
return 0;
}
/*--------------------------------------------------------------------------*/
/* This creates a memory file handle with a copy of the URL in filename. The
file is uncompressed if necessary */
int ftp_open(char *filename, int rwmode, int *handle)
{
FILE *ftpfile;
FILE *command;
int sock;
char newfilename[MAXLEN];
char recbuf[MAXLEN];
long len;
int status;
char firstchar;
closememfile = 0;
closecommandfile = 0;
closeftpfile = 0;
/* don't do r/w files */
if (rwmode != 0) {
ffpmsg("Can't open ftp:// type file with READWRITE access");
ffpmsg("Specify an outfile for r/w access (ftp_open)");
return (FILE_NOT_OPENED);
}
/* do the signal handler bits */
if (setjmp(env) != 0) {
/* feels like the second time */
/* this means something bad happened */
ffpmsg("Timeout (http_open)");
goto error;
}
signal(SIGALRM, signal_handler);
/* Open the ftp connetion. ftpfile is connected to the file port,
command is connected to port 21. sock is the socket on port 21 */
if (strlen(filename) > MAXLEN - 4) {
ffpmsg("filename too long (ftp_open)");
ffpmsg(filename);
goto error;
}
alarm(NETTIMEOUT);
strcpy(newfilename,filename);
/* Does the file have a .Z or .gz in it */
if (strstr(newfilename,".Z") || strstr(newfilename,".gz")) {
alarm(NETTIMEOUT);
if (ftp_open_network(filename,&ftpfile,&command,&sock)) {
alarm(0);
ffpmsg("Unable to open ftp file (ftp_open)");
ffpmsg(filename);
goto error;
}
} else {
/* Try the .gz one */
strcpy(newfilename,filename);
strcat(newfilename,".gz");