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#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;
}
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