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Date:      Sat, 9 Dec 1995 12:19:08 -0600 (CST)
From:      Joe Greco <jgreco@brasil.moneng.mei.com>
To:        ache@astral.msk.su (=?KOI8-R?Q?=E1=CE=C4=D2=C5=CA_=FE=C5=D2=CE=CF=D7?=)
Cc:        hackers@freebsd.org
Subject:   Re: Does anybody knows a way to get file via HTTP
Message-ID:  <199512091819.MAA22305@brasil.moneng.mei.com>
In-Reply-To: <KH8kOomCL1@deep-thought.demos.su> from "=?KOI8-R?Q?=E1=CE=C4=D2=C5=CA_=FE=C5=D2=CE=CF=D7?=" at Dec 9, 95 04:13:44 pm
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> It is actual, because more and more sites places archives available by
> HTTP only.
> All browsers I know can't work in background... :-(

I assume you can write a small C program to do it, but I really don't know
for sure.  Typically I test http servers by doing

telnet www.server.name. 80
GET /path/file

for "http://www.server.name/path/file"  (remember http does not specify the
"http://www.server.name" in the GET command).  I would suspect you can
simply catch the response from the server and save it.

Since I do these little sorts of programs all the time, I can probably take
something I already have and throw something new together in 45 seconds...
Ok, here is a sample "webget":

% webget www.sol.net. 80 /demon43_ps1.bkgd.gif /tmp/test.gif
% xv /tmp/test.gif

source code below.

... Joe

-------------------------------------------------------------------------------
Joe Greco - Systems Administrator			      jgreco@ns.sol.net
Solaria Public Access UNIX - Milwaukee, WI			   414/342-4847



#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <netdb.h>


#define	bcopy(a, b, c)	memcpy((b), (a), (c))

int main(argc, argv)
int argc;
char *argv[];
{
	int s;
	int fd;
	struct sockaddr_in sin;
	int addrlen;
	struct hostent *host;
	char buffer[65536];
	int ofd, rval;

	if (argc < 4 || argc > 5) {
		fprintf(stderr, "usage: webget <host> <port> <relative-path> [<local-filename>]\n");
		exit(1);
	}

	if (argc == 5) {
		if ((ofd = open(argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0) {
			perror(argv[4]);
			exit(1);
		}
	} else {
		ofd = fileno(stdout);
	}

	sin.sin_port = 0;
	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = INADDR_ANY;

	if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		perror("socket");
		exit(1);
	}
	if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
		perror("bind");
		exit(1);
	}
	sin.sin_port = htons(atoi(argv[2]));
	sin.sin_family = AF_INET;
	if (isdigit(*argv[1])) {
		sin.sin_addr.s_addr = inet_addr(argv[1]);
	} else {
		if (! (host = gethostbyname(argv[1]))) {
			perror(argv[1]);
			exit(1);
		}
		bcopy(host->h_addr_list[0], (char *)&sin.sin_addr.s_addr, sizeof(sin.sin_addr.s_addr));
	}
	if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
		perror("connect");
		exit(1);
	}
	
	sprintf(buffer, "GET %s\r\n", argv[3]);
	write(s, buffer, strlen(buffer));

	while (rval = read(s, buffer, sizeof(buffer))) {
		if (rval > 0) {
			if (write(ofd, buffer, rval) < 0) {
				perror("write");
				exit(1);
			}
		} else {
			perror("read");
			exit(1);
		}
	}
	close(s);
	close(ofd);
	exit(0);
}

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