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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
/*
* Get the domainpart of the Jabber ID (JID)
*
* See https://datatracker.ietf.org/doc/html/rfc7622#section-3.2 for details.
*/
char *get_domainpart(char *jid)
{
int start = 0; // inclusive
int stop = strlen(jid); // exclusive
for(int i=0; i<strlen(jid); i++) {
if (jid[i] == '/') {
stop = i;
break;
}
}
for(int i=0; i<strlen(jid); i++) {
if (jid[i] == '@') {
start = i + 1;
break;
}
}
char *retval = (char *)malloc((stop-start+1) * sizeof(char));
memcpy(retval, jid+start, (stop-start) * sizeof(char));
retval[stop] = '\0';
return retval;
}
/*
* Return the preferred struct addrinfo * or NULL
*
* This handles DNS resolution. It returns the first valid addrinfo which is
* returned by getaddrinfo. Mind that the addrinfo could use IPv6 instead of
* IPv4.
*/
struct addrinfo *get_addrinfo(char *domain)
{
struct addrinfo hints;
struct addrinfo *servinfo;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(domain, "xmpp-client", &hints, &servinfo) != 0) {
printf("Failed to resolve hostname '%s'.\n", domain);
return NULL;
}
struct addrinfo *p;
for(p=servinfo; p!=NULL; p=p->ai_next) {
if (p->ai_family == AF_INET) {
printf("an IPv4!\n"); // TODO
} else if (p->ai_family == AF_INET6) {
printf("an IPv6!\n"); // TODO
} else {
printf("Unknown addrinfo address type.\n");
}
}
return NULL;
}
/*
* Initialize the network connection to the XMPP server
*
* TODO: Error handling is missing.
*/
void xmpp_connect(void)
{
printf("net_init()\n");
char *jid = getenv("LIMOX_USER");
char *pwd = getenv("LIMOX_PWD");
printf("Trying to connect as '%s' with '%s'.\n", jid, pwd);
char *domain = get_domainpart(jid);
printf("Domainpart is '%s'.\n", domain);
get_addrinfo(domain);
}
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