Basic http working

1 files changed, 100 insertions, 0 deletions

diff --git a/getgbook.c b/getgbook.c
new file mode 100644
index 0000000..c17abf6
--- /dev/null
+++ b/getgbook.c
@@ -0,0 +1,100 @@
+#define usage "getgbook bookid"
+
+#define hostname "books.google.com"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+void die(char *msg) {
+	fputs(msg, stderr);
+	exit(EXIT_FAILURE);
+}
+
+int dial(char *host, char *port) {
+	static struct addrinfo hints;
+	int srv;
+	struct addrinfo *res, *r;
+
+	memset(&hints, 0, sizeof hints);
+	hints.ai_family = AF_UNSPEC;
+	hints.ai_socktype = SOCK_STREAM;
+	if(getaddrinfo(host, port, &hints, &res) != 0)
+		die("error: cannot resolve hostname\n");
+	for(r = res; r; r = r->ai_next) {
+		if((srv = socket(r->ai_family, r->ai_socktype, r->ai_protocol)) == -1)
+			continue;
+		if(connect(srv, r->ai_addr, r->ai_addrlen) == 0)
+			break;
+		close(srv);
+	}
+	freeaddrinfo(res);
+	if(!r)
+		die("error: cannot connect to host\n");
+	return srv;
+}
+
+char * get(FILE *srv, char *host, char *path) {
+	size_t l, res;
+	int fd, i;
+	char *buf, *c, *p;
+
+	fprintf(srv, "GET %s HTTP/1.0\r\nUser-Agent: getgbook-prealpha (not mozilla)\r\nHost: %s\r\n\r\n", path, host);
+
+	fflush(srv);
+
+	l=0;
+	fd = fileno(srv);
+
+	buf = malloc(sizeof(char *) * 4096);
+	for(i=0; (res = read(fd, buf+l, 4096)) > 0; l+=res, i++)
+		buf = realloc(buf, sizeof(char *) * (l+4096));
+
+	/* check that it's a 200 */
+	if(strncmp(buf+9, "200 ", 4)) {
+		free(buf);
+		return NULL;
+	}
+
+	/* exclude header */
+	for(p = buf; *p && *(p+1) && *(p+2) && *(p+3); p++)
+		if(!strncmp(p, "\r\n\r\n", 4)) break;
+	p+=4;
+	
+	i = l - (p - buf);
+	c = malloc(i);
+	memcpy(c, p, i);
+	free(buf);
+
+	return c;
+}
+
+int main(int argc, char *argv[])
+{
+	int i, s;
+	char *bookid, url[80];
+	char *curpage;
+	FILE *srv;
+
+	if(argc != 2)
+		die("usage: " usage "\n");
+
+	bookid = argv[1];
+
+	i = dial(hostname, "80");
+	srv = fdopen(i, "r+");
+
+	snprintf(url, 80, "/books?id=%s&pg=%s&jscmd=click3", bookid, "PA1");
+	if((curpage = get(srv, hostname, url)) == NULL)
+		fprintf(stderr,"Error downloading page\n");
+	else {
+		fputs(curpage,stdout);
+		free(curpage);
+	}
+
+	return 0;
+}