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