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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <curl/curl.h>
/*
* Global option flags
*/
int Debug = 0;
void
debug(int level, char *fmt, ...)
{
va_list ap;
if (Debug < level)
return;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
int
error(int fatal, char *fmt, ...)
{
va_list ap;
fprintf(stderr, fatal ? "Error: " : "Warning: ");
if (errno)
fprintf(stderr, "%s: ", strerror(errno));
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if (fatal > 0)
exit(fatal);
else
{
errno = 0;
return (fatal);
}
}
void
usage(void)
{
fprintf(stderr,
"Usage:\n"
" linuxtrade-curl [options] URL\n"
"\n"
" Hack to avoid broken -N behavior with all curl versions up thru at\n"
" least version 7.10.5. This version of curl supports only unbuffered,\n"
" simple HTTP retrieval.\n"
"\n"
" Someday, when curl version 7.10.6 or later is widely distributed, I\n"
" hope to be able to remove this program.\n"
"\n"
"Options:\n"
" -D lvl Set Debug level [%d]\n"
, Debug
);
exit(1);
}
size_t
mywrite(void *ptr, size_t size, size_t nmemb, void *stream)
{
write(1, ptr, size*nmemb);
return size*nmemb;
}
void
fixurl(char *dp, char *sp)
{
char *s, *e;
char name[512];
char buf[512];
FILE *fp;
s = strstr(sp, "://");
if (!s)
{
strcpy(dp, sp);
return;
}
s += 3;
e = strchr(s, ':');
if (!e)
e = strchr(s, '/');
if (!e)
e = strchr(s, '\0');
memcpy(name, s, e-s); name[e-s] = 0;
if (inet_addr(name) != INADDR_NONE)
{
strcpy(dp, sp);
return;
}
if (Debug)
fprintf(stderr, "Change URL '%s'\n", name);
sprintf(buf, "host -W20 '%s' 2>/dev/null", name);
fp = popen(buf, "r");
if (fp)
{
while (fgets(buf, sizeof(buf), fp) != NULL)
{
char *p;
long ipaddr;
p = strrchr(buf, '\n'); if (p) *p = 0;
p = strrchr(buf, ' ');
if (!p) continue;
ipaddr = inet_addr(p+1);
if (ipaddr != INADDR_NONE)
{
pclose(fp);
memcpy(dp, sp, s-sp);
strcpy(dp + (s-sp), p+1);
strcat(dp, e);
if (Debug)
fprintf(stderr, "Changed URL '%s' to '%s'\n", sp, dp);
return;
}
}
pclose(fp);
}
strcpy(dp, sp);
return;
}
int
main(int argc, char *argv[])
{
extern int optind;
extern char *optarg;
int c;
CURL *curl;
CURLcode rc;
char *url;
char *absurl;
while ( (c = getopt(argc, argv, "NA:sD:?h")) != EOF)
switch (c)
{
case 'N': break;
case 's': break;
case 'A': break;
case 'D':
Debug = atoi(optarg);
break;
default:
usage();
exit(1);
}
argc -= optind;
argv += optind;
if (argc != 1)
error(1, "Missing or too many URL's\n");
url = argv[0];
absurl = malloc(strlen(url) + 64);
fixurl(absurl, url);
curl = curl_easy_init();
if (!curl)
error(1, "Unable to initialize libcurl\n");
curl_easy_setopt(curl, CURLOPT_URL, absurl);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, mywrite);
curl_easy_setopt(curl, CURLOPT_USERAGENT,
"Mozilla/4.78 [en] (X11; U; Linux 2.4.9-13 i686)");
rc = curl_easy_perform(curl);
if (rc)
error(1, "Error %d on curl library\n");
/* always cleanup */
curl_easy_cleanup(curl);
exit(0);
}
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