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#include "string.h"
#include "resolv.h"
#include "etherboot.h" /* for arptable */
#include "url.h"
/*
* Parse a URL and deduce a struct protocol *, a struct sockaddr_in
* and a char *filename.
*
* We accept URLs of the form
*
* [protocol://[host][:port]/]path/to/file
*
* Returns 1 for success, 0 for failure (e.g. unknown protocol).
*
*/
int parse_url ( char *url, struct protocol **proto,
struct sockaddr_in *server, char **filename ) {
char *p;
char *protocol = NULL;
char *host = NULL;
char *port = NULL;
int rc = 0;
DBG ( "URL parsing \"%s\"\n", url );
/* If no protocol is present, the whole URL will be a filename */
*filename = url;
/* Search for a protocol delimiter. If found, parse out the
* host and port parts of the URL, inserting NULs to terminate
* the different sections.
*/
for ( p = url ; *p ; p++ ) {
if ( memcmp ( p, "://", 3 ) != 0 )
continue;
/* URL has an explicit protocol */
*p = '\0';
p += 3;
protocol = url;
host = p;
/* Search for port and file delimiters */
for ( ; *p ; p++ ) {
if ( *p == ':' ) {
*p = '\0';
port = p + 1;
continue;
}
if ( *p == '/' ) {
*(p++) = '\0';
break;
}
}
*filename = p;
break;
}
DBG ( "URL protocol \"%s\" host \"%s\" port \"%s\" file \"%s\"\n",
protocol ? protocol : "(default)", host ? host : "(default)",
port ? port : "(default)", *filename );
/* Identify the protocol */
*proto = identify_protocol ( protocol );
if ( ! *proto ) {
DBG ( "URL unknown protocol \"%s\"\n",
protocol ? protocol : "(default)" );
goto out;
}
/* Identify the host */
server->sin_addr = arptable[ARP_SERVER].ipaddr;
if ( host && host[0] ) {
if ( ! resolv ( &server->sin_addr, host ) ) {
DBG ( "URL unknown host \"%s\"\n", host );
goto out;
}
}
/* Identify the port */
server->sin_port = (*proto)->default_port;
if ( port && port[0] ) {
server->sin_port = strtoul ( port, NULL, 10 );
}
rc = 1;
out:
/* Fill back in the original URL */
if ( protocol ) {
(*filename)[-1] = '/';
if ( port )
port[-1] = ':';
host[-3] = ':';
}
return rc;
}
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