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Complete pnal_get_gateway() TODO, but just Linux #563

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Complete pnal_get_gateway() TODO, but just Linux #563

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c4dce1d
Complete pnal_get_gateway function read the actual deafult gateway on…
Aug 24, 2023
e1c5f3b
Change readed gateway to net endian
Aug 24, 2023
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20 changes: 13 additions & 7 deletions src/ports/linux/pnal.c
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Original file line number Diff line number Diff line change
Expand Up @@ -560,20 +560,26 @@ pnal_ipaddr_t pnal_get_netmask (const char * interface_name)

pnal_ipaddr_t pnal_get_gateway (const char * interface_name)
{
/* TODO Read the actual default gateway (somewhat complicated) */
int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
{
return PNAL_IPADDR_INVALID;
}

pnal_ipaddr_t ip;
pnal_ipaddr_t gateway;
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, interface_name, IFNAMSIZ - 1);

ip = pnal_get_ip_address (interface_name);
if (ip == PNAL_IPADDR_INVALID)
if (ioctl(sockfd, SIOCGIFDSTADDR, &ifr) < 0)
{
close(sockfd);
return PNAL_IPADDR_INVALID;
}

gateway = (ip & 0xFFFFFF00) | 0x00000001;
close(sockfd);

return gateway;
struct sockaddr_in *gateway = (struct sockaddr_in *)&ifr.ifr_dstaddr;
return ntohl(gateway->sin_addr.s_addr);
}

int pnal_get_hostname (char * hostname)
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