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| | /*
* Copyright (C) 2012-2020 all contributors <cmogstored-public@yhbt.net>
* License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
*/
#include "cmogstored.h"
#include <arpa/inet.h>
/*
* small replacement for getnameinfo(3), this only handles numeric types
* for IPv4 and IPv6 and uses the compact mog_ni structure to reduce
* stack usage in error reporting.
*/
void mog_nameinfo(struct mog_packaddr *mpa, struct mog_ni *ni)
{
char *hostptr = ni->ni_host;
size_t hostlen = sizeof(ni->ni_host) - (sizeof("[]") - 1);
char *servptr = ni->ni_serv + 1; /* offset for ':' */
size_t servlen = sizeof(ni->ni_serv) - 1; /* offset for ':' */
int rc;
const void *src;
const char *ret;
if (mpa->sa_family == AF_INET6) {
hostptr[0] = '['; /* leading '[' */
src = mpa->as.in6_ptr;
hostptr++;
} else {
assert(mpa->sa_family == AF_INET && "bad family");
src = &mpa->as.in_addr;
}
ret = inet_ntop(mpa->sa_family, src, hostptr, (socklen_t)hostlen);
/* terminate serv string on error */
assert(ret == hostptr && "inet_ntop");
ni->ni_serv[0] = ':';
/* add trailing ']' */
if (mpa->sa_family == AF_INET6) {
hostlen = strlen(hostptr);
hostptr[hostlen] = ']';
hostptr[hostlen + 1] = 0;
}
/* port number */
rc = snprintf(servptr, servlen, "%u", (unsigned)ntohs(mpa->port));
assert(rc > 0 && rc < (int)servlen && "we suck at snprintf");
}
|