/* Gets IPv6 interface information from the /proc filesystem in linux*/
struct ifi_info *get_ifi_info_linuxv6(int family, int doaliases)
{
struct ifi_info *ifi, *ifihead, **ifipnext, *ifipold, **ifiptr;
FILE *fp;
char addr[8][5];
int flags, myflags, index, plen, scope;
char ifname[9], lastname[IFNAMSIZ];
char addr6[32+7+1]; /* don't forget the seven ':' */
struct addrinfo hints, *res0;
struct sockaddr_in6 *sin6;
struct in6_addr *addrptr;
int err;
int sockfd = -1;
struct ifreq ifr;
res0=NULL;
ifihead = NULL;
ifipnext = &ifihead;
lastname[0] = 0;
if ((fp = fopen(PROC_IFINET6_PATH, "r")) != NULL) {
sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
if (sockfd < 0) {
goto gotError;
}
while (fscanf(fp,
"%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %8s\n",
addr[0],addr[1],addr[2],addr[3],
addr[4],addr[5],addr[6],addr[7],
&index, &plen, &scope, &flags, ifname) != EOF) {
myflags = 0;
if (strncmp(lastname, ifname, IFNAMSIZ) == 0) {
if (doaliases == 0)
continue; /* already processed this interface */
myflags = IFI_ALIAS;
}
memcpy(lastname, ifname, IFNAMSIZ);
ifi = (struct ifi_info*)calloc(1, sizeof(struct ifi_info));
if (ifi == NULL) {
goto gotError;
}
ifipold = *ifipnext; /* need this later */
ifiptr = ifipnext;
*ifipnext = ifi; /* prev points to this new one */
ifipnext = &ifi->ifi_next; /* pointer to next one goes here */
sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s",
addr[0],addr[1],addr[2],addr[3],
addr[4],addr[5],addr[6],addr[7]);
/* Add address of the interface */
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_flags = AI_NUMERICHOST;
err = getaddrinfo(addr6, NULL, &hints, &res0);
if (err) {
goto gotError;
}
ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6));
if (ifi->ifi_addr == NULL) {
goto gotError;
}
memcpy(ifi->ifi_addr, res0->ai_addr, sizeof(struct sockaddr_in6));
/* Add netmask of the interface */
char ipv6addr[INET6_ADDRSTRLEN];
plen_to_mask(plen, ipv6addr);
ifi->ifi_netmask = calloc(1, sizeof(struct sockaddr_in6));
if (ifi->ifi_addr == NULL) {
goto gotError;
}
sin6=calloc(1, sizeof(struct sockaddr_in6));
addrptr=calloc(1, sizeof(struct in6_addr));
inet_pton(family, ipv6addr, addrptr);
sin6->sin6_family=family;
sin6->sin6_addr=*addrptr;
sin6->sin6_scope_id=scope;
memcpy(ifi->ifi_netmask, sin6, sizeof(struct sockaddr_in6));
free(sin6);
/* Add interface name */
memcpy(ifi->ifi_name, ifname, IFI_NAME);
/* Add interface index */
ifi->ifi_index = index;
/* Add interface flags*/
memcpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
if (errno == EADDRNOTAVAIL) {
/*
* If the main interface is configured with no IP address but
* an alias interface exists with an IP address, you get
* EADDRNOTAVAIL for the main interface
*/
free(ifi->ifi_addr);
free(ifi);
ifipnext = ifiptr;
*ifipnext = ifipold;
continue;
} else {
goto gotError;
}
}
ifi->ifi_flags = ifr.ifr_flags;
freeaddrinfo(res0);
res0=NULL;
}
}
goto done;
gotError:
if (ifihead != NULL) {
free_ifi_info(ifihead);
ifihead = NULL;
}
if (res0 != NULL) {
freeaddrinfo(res0);
res0=NULL;
}
done:
if (sockfd != -1) {
assert(close(sockfd) == 0);
}
return(ifihead); /* pointer to first structure in linked list */
}
/* Gets IPv6 interface information from the /proc filesystem in linux*/
struct ifi_info *get_ifi_info_linuxv6(int family, int doaliases)
{
struct ifi_info *ifi, *ifihead, **ifipnext;
FILE *fp;
char addr[8][5];
int flags, myflags, index, plen, scope;
char ifname[9], lastname[IFNAMSIZ];
char addr6[32+7+1]; /* don't forget the seven ':' */
struct addrinfo hints, *res0;
struct sockaddr_in6 *sin6;
struct in6_addr *addrptr;
int err;
res0=NULL;
ifihead = NULL;
ifipnext = &ifihead;
lastname[0] = 0;
if ((fp = fopen(PROC_IFINET6_PATH, "r")) != NULL) {
while (fscanf(fp,
"%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %8s\n",
addr[0],addr[1],addr[2],addr[3],
addr[4],addr[5],addr[6],addr[7],
&index, &plen, &scope, &flags, ifname) != EOF) {
myflags = 0;
if (strncmp(lastname, ifname, IFNAMSIZ) == 0) {
if (doaliases == 0)
continue; /* already processed this interface */
myflags = IFI_ALIAS;
}
memcpy(lastname, ifname, IFNAMSIZ);
ifi = (struct ifi_info*)calloc(1, sizeof(struct ifi_info));
if (ifi == NULL) {
goto gotError;
}
*ifipnext = ifi; /* prev points to this new one */
ifipnext = &ifi->ifi_next; /* pointer to next one goes here */
sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s",
addr[0],addr[1],addr[2],addr[3],
addr[4],addr[5],addr[6],addr[7]);
/* Add address of the interface */
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_flags = AI_NUMERICHOST;
err = getaddrinfo(addr6, NULL, &hints, &res0);
if (err) {
goto gotError;
}
ifi->ifi_addr = calloc(1, sizeof(struct sockaddr_in6));
if (ifi->ifi_addr == NULL) {
goto gotError;
}
memcpy(ifi->ifi_addr, res0->ai_addr, sizeof(struct sockaddr_in6));
/* Add netmask of the interface */
char ipv6addr[INET6_ADDRSTRLEN];
plen_to_mask(plen, ipv6addr);
ifi->ifi_netmask = calloc(1, sizeof(struct sockaddr_in6));
if (ifi->ifi_addr == NULL) {
goto gotError;
}
sin6=calloc(1, sizeof(struct sockaddr_in6));
addrptr=calloc(1, sizeof(struct in6_addr));
inet_pton(family, ipv6addr, addrptr);
sin6->sin6_family=family;
sin6->sin6_addr=*addrptr;
sin6->sin6_scope_id=scope;
memcpy(ifi->ifi_netmask, sin6, sizeof(struct sockaddr_in6));
free(sin6);
/* Add interface name */
memcpy(ifi->ifi_name, ifname, IFI_NAME);
/* Add interface index */
ifi->ifi_index = index;
/* If interface is in /proc then it is up*/
ifi->ifi_flags = IFF_UP;
freeaddrinfo(res0);
res0=NULL;
}
}
goto done;
gotError:
if (ifihead != NULL) {
free_ifi_info(ifihead);
ifihead = NULL;
}
if (res0 != NULL) {
freeaddrinfo(res0);
res0=NULL;
}
done:
return(ifihead); /* pointer to first structure in linked list */
}
