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[misc] Add utility function to get interface name from IP address

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This commit is contained in:
ejurgensen 2022-07-14 21:12:31 +02:00
parent 680c27eb66
commit 3754871c73
2 changed files with 40 additions and 3 deletions
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40
src/misc.c
View File

@ -50,6 +50,7 @@
#include <netdb.h> #include <netdb.h>
#include <arpa/inet.h> #include <arpa/inet.h>
#include <ifaddrs.h> // getifaddrs
#include <unistr.h> #include <unistr.h>
#include <uniconv.h> #include <uniconv.h>
@ -160,13 +161,13 @@ net_peer_address_is_trusted(const char *addr)
int int
net_address_get(char *addr, size_t addr_len, union net_sockaddr *naddr) net_address_get(char *addr, size_t addr_len, union net_sockaddr *naddr)
{ {
const char *s; const char *s = NULL;
memset(addr, 0, addr_len); // Just in case caller doesn't check for errors memset(addr, 0, addr_len); // Just in case caller doesn't check for errors
if (naddr->sa.sa_family == AF_INET6) if (naddr->sa.sa_family == AF_INET6)
s = inet_ntop(AF_INET6, &naddr->sin6.sin6_addr, addr, addr_len); s = inet_ntop(AF_INET6, &naddr->sin6.sin6_addr, addr, addr_len);
else else if (naddr->sa.sa_family == AF_INET)
s = inet_ntop(AF_INET, &naddr->sin.sin_addr, addr, addr_len); s = inet_ntop(AF_INET, &naddr->sin.sin_addr, addr, addr_len);
if (!s) if (!s)
@ -180,12 +181,45 @@ net_port_get(short unsigned *port, union net_sockaddr *naddr)
{ {
if (naddr->sa.sa_family == AF_INET6) if (naddr->sa.sa_family == AF_INET6)
*port = ntohs(naddr->sin6.sin6_port); *port = ntohs(naddr->sin6.sin6_port);
else else if (naddr->sa.sa_family == AF_INET)
*port = ntohs(naddr->sin.sin_port); *port = ntohs(naddr->sin.sin_port);
else
return -1;
return 0; return 0;
} }
int
net_if_get(char *ifname, size_t ifname_len, const char *addr)
{
struct ifaddrs *ifaddrs;
struct ifaddrs *iap;
char s[64];
memset(ifname, 0, ifname_len);
getifaddrs(&ifaddrs);
for (iap = ifaddrs; iap; iap = iap->ifa_next)
{
if (!iap->ifa_addr)
continue;
if (net_address_get(s, sizeof(s), (union net_sockaddr *)iap->ifa_addr) < 0)
continue;
if (strcmp(s, addr) != 0)
continue;
snprintf(ifname, ifname_len, "%s", iap->ifa_name);
break;
}
freeifaddrs(ifaddrs);
return (ifname[0] != 0) ? 0 : -1;
}
int int
net_connect(const char *addr, unsigned short port, int type, const char *log_service_name) net_connect(const char *addr, unsigned short port, int type, const char *log_service_name)
{ {

3
src/misc.h
View File

@ -43,6 +43,9 @@ net_address_get(char *addr, size_t addr_len, union net_sockaddr *naddr);
int int
net_port_get(short unsigned *port, union net_sockaddr *naddr); net_port_get(short unsigned *port, union net_sockaddr *naddr);
int
net_if_get(char *ifname, size_t ifname_len, const char *addr);
// Returns the socket fd from socket(), -1 on error // Returns the socket fd from socket(), -1 on error
int int
net_connect(const char *addr, unsigned short port, int type, const char *log_service_name); net_connect(const char *addr, unsigned short port, int type, const char *log_service_name);