diff options
Diffstat (limited to 'lib/tun.c')
| -rw-r--r-- | lib/tun.c | 712 |
1 files changed, 0 insertions, 712 deletions
@@ -42,8 +42,6 @@ #if defined(__linux__) #include <linux/if_tun.h> -#include <linux/netlink.h> -#include <linux/rtnetlink.h> #elif defined (__FreeBSD__) #include <net/if_tun.h> @@ -60,138 +58,6 @@ #include "tun.h" #include "syserr.h" -#if defined(__linux__) - -#include <linux/ipv6.h> - -static int tun_nlattr(struct nlmsghdr *n, int nsize, int type, void *d, int dlen) -{ - int len = RTA_LENGTH(dlen); - int alen = NLMSG_ALIGN(n->nlmsg_len); - struct rtattr *rta = (struct rtattr *)(((void *)n) + alen); - if (alen + len > nsize) - return -1; - rta->rta_len = len; - rta->rta_type = type; - memcpy(RTA_DATA(rta), d, dlen); - n->nlmsg_len = alen + len; - return 0; -} -#endif - -static int netdev_sifflags(const char *devname, int flags) -{ - struct ifreq ifr; - int fd; - - memset(&ifr, '\0', sizeof(ifr)); - ifr.ifr_flags = flags; - strncpy(ifr.ifr_name, devname, IFNAMSIZ); - ifr.ifr_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */ - if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); - return -1; - } - if (ioctl(fd, SIOCSIFFLAGS, &ifr)) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "ioctl(SIOCSIFFLAGS) failed"); - close(fd); - return -1; - } - close(fd); - return 0; -} - -static int netdev_setaddr4(const char *devname, struct in_addr *addr, - struct in_addr *dstaddr, struct in_addr *netmask) -{ - struct ifreq ifr; - int fd; - - memset(&ifr, '\0', sizeof(ifr)); - ifr.ifr_addr.sa_family = AF_INET; - ifr.ifr_dstaddr.sa_family = AF_INET; - -#if defined(__linux__) - ifr.ifr_netmask.sa_family = AF_INET; - -#elif defined(__FreeBSD__) || defined (__APPLE__) - ((struct sockaddr_in *)&ifr.ifr_addr)->sin_len = - sizeof(struct sockaddr_in); - ((struct sockaddr_in *)&ifr.ifr_dstaddr)->sin_len = - sizeof(struct sockaddr_in); -#endif - - strncpy(ifr.ifr_name, devname, IFNAMSIZ); - ifr.ifr_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */ - - /* Create a channel to the NET kernel. */ - if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); - return -1; - } - - if (addr) { /* Set the interface address */ - memcpy(&((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr, addr, - sizeof(*addr)); - if (ioctl(fd, SIOCSIFADDR, (void *)&ifr) < 0) { - if (errno != EEXIST) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "ioctl(SIOCSIFADDR) failed"); - } else { - SYS_ERR(DTUN, LOGL_NOTICE, errno, - "ioctl(SIOCSIFADDR): Address already exists"); - } - close(fd); - return -1; - } - } - - if (dstaddr) { /* Set the destination address */ - memcpy(&((struct sockaddr_in *)&ifr.ifr_dstaddr)->sin_addr, - dstaddr, sizeof(*dstaddr)); - if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t) & ifr) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "ioctl(SIOCSIFDSTADDR) failed"); - close(fd); - return -1; - } - } - - if (netmask) { /* Set the netmask */ -#if defined(__linux__) - memcpy(&((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr, - netmask, sizeof(*netmask)); - -#elif defined(__FreeBSD__) || defined (__APPLE__) - ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr = - netmask->s_addr; -#endif - - if (ioctl(fd, SIOCSIFNETMASK, (void *)&ifr) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "ioctl(SIOCSIFNETMASK) failed"); - close(fd); - return -1; - } - } - - close(fd); - - /* On linux the route to the interface is set automatically - on FreeBSD we have to do this manually */ - - /* TODO: How does it work on Solaris? */ - - netdev_sifflags(devname, IFF_UP | IFF_RUNNING); - -#if defined(__FreeBSD__) || defined (__APPLE__) - netdev_addroute(dstaddr, addr, &this->netmask); -#endif - - return 0; -} - static int tun_setaddr4(struct tun_t *this, struct in_addr *addr, struct in_addr *dstaddr, struct in_addr *netmask) { @@ -214,87 +80,6 @@ static int tun_setaddr4(struct tun_t *this, struct in_addr *addr, return rc; } -static int netdev_setaddr6(const char *devname, struct in6_addr *addr, struct in6_addr *dstaddr, - size_t prefixlen) -{ - struct in6_ifreq ifr; - int fd; - - memset(&ifr, 0, sizeof(ifr)); - -#if defined(__linux__) - ifr.ifr6_prefixlen = prefixlen; - ifr.ifr6_ifindex = if_nametoindex(devname); - if (ifr.ifr6_ifindex == 0) { - SYS_ERR(DTUN, LOGL_ERROR, 0, "Error getting ifindex for %s\n", devname); - return -1; - } -#elif defined(__FreeBSD__) || defined (__APPLE__) - strncpy(ifr.ifr_name, devname, IFNAMSIZ); -#endif - - /* Create a channel to the NET kernel */ - if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, 0, "socket() failed"); - return -1; - } - -#if defined(__linux__) - if (addr) { - memcpy(&ifr.ifr6_addr, addr, sizeof(*addr)); - if (ioctl(fd, SIOCSIFADDR, (void *) &ifr) < 0) { - if (errno != EEXIST) { - SYS_ERR(DTUN, LOGL_ERROR, 0, "ioctl(SIOCSIFADDR) failed"); - } else { - SYS_ERR(DTUN, LOGL_NOTICE, 0, "ioctl(SIOCSIFADDR): Address already exists"); - } - close(fd); - return -1; - } - } - -#if 0 - /* FIXME: looks like this is not possible/necessary for IPv6? */ - if (dstaddr) { - memcpy(&ifr.ifr6_addr, dstaddr, sizeof(*dstaddr)); - if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t *) &ifr) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, "ioctl(SIOCSIFDSTADDR) failed"); - close(fd); - return -1; - } - } -#endif - -#elif defined(__FreeBSD__) || defined (__APPLE__) - if (addr) - memcpy(&ifr.ifr_ifru.ifru_addr, addr, sizeof(ifr.ifr_ifru.ifru_addr)); - if (dstaddr) - memcpy(&ifr.ifr_ifru.ifru_dstaddr, dstaddr, sizeof(ifr.ifr_ifru.ifru_dstaddr)); - - if (ioctl(fd, SIOCSIFADDR_IN6, (struct ifreq *)&ifr) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, 0, "ioctl(SIOCSIFADDR_IN6) failed"); - close(fd); - return -1; - } -#endif - - close(fd); - - /* On linux the route to the interface is set automatically - on FreeBSD we have to do this manually */ - - /* TODO: How does it work on Solaris? */ - - netdev_sifflags(devname, IFF_UP | IFF_RUNNING); - -#if 0 /* FIXME */ -//#if defined(__FreeBSD__) || defined (__APPLE__) - netdev_addroute6(dstaddr, addr, prefixlen); -#endif - - return 0; -} - static int tun_setaddr6(struct tun_t *this, struct in6_addr *addr, struct in6_addr *dstaddr, size_t prefixlen) { @@ -326,166 +111,6 @@ int tun_setaddr(struct tun_t *this, struct in46_addr *addr, struct in46_addr *ds } } -static int netdev_addaddr4(const char *devname, struct in_addr *addr, - struct in_addr *dstaddr, struct in_addr *netmask) -{ - -#if defined(__linux__) - struct { - struct nlmsghdr n; - struct ifaddrmsg i; - char buf[TUN_NLBUFSIZE]; - } req; - - struct sockaddr_nl local; - socklen_t addr_len; - int fd; - int status; - - struct sockaddr_nl nladdr; - struct iovec iov; - struct msghdr msg; - - memset(&req, 0, sizeof(req)); - req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); - req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; - req.n.nlmsg_type = RTM_NEWADDR; - req.i.ifa_family = AF_INET; - req.i.ifa_prefixlen = 32; /* 32 FOR IPv4 */ - req.i.ifa_flags = 0; - req.i.ifa_scope = RT_SCOPE_HOST; /* TODO or 0 */ - req.i.ifa_index = if_nametoindex(devname); - if (!req.i.ifa_index) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "Unable to get ifindex for %s", devname); - return -1; - } - - tun_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(*addr)); - if (dstaddr) - tun_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(*dstaddr)); - - if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); - return -1; - } - - memset(&local, 0, sizeof(local)); - local.nl_family = AF_NETLINK; - local.nl_groups = 0; - - if (bind(fd, (struct sockaddr *)&local, sizeof(local)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "bind() failed"); - close(fd); - return -1; - } - - addr_len = sizeof(local); - if (getsockname(fd, (struct sockaddr *)&local, &addr_len) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "getsockname() failed"); - close(fd); - return -1; - } - - if (addr_len != sizeof(local)) { - SYS_ERR(DTUN, LOGL_ERROR, 0, - "Wrong address length %d", addr_len); - close(fd); - return -1; - } - - if (local.nl_family != AF_NETLINK) { - SYS_ERR(DTUN, LOGL_ERROR, 0, - "Wrong address family %d", local.nl_family); - close(fd); - return -1; - } - - iov.iov_base = (void *)&req.n; - iov.iov_len = req.n.nlmsg_len; - - msg.msg_name = (void *)&nladdr; - msg.msg_namelen = sizeof(nladdr); - msg.msg_iov = &iov; - msg.msg_iovlen = 1; - msg.msg_control = NULL; - msg.msg_controllen = 0; - msg.msg_flags = 0; - - memset(&nladdr, 0, sizeof(nladdr)); - nladdr.nl_family = AF_NETLINK; - nladdr.nl_pid = 0; - nladdr.nl_groups = 0; - - req.n.nlmsg_seq = 0; - req.n.nlmsg_flags |= NLM_F_ACK; - - status = sendmsg(fd, &msg, 0); - if (status != req.n.nlmsg_len) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "sendmsg() failed, returned %d", status); - close(fd); - return -1; - } - - status = netdev_sifflags(devname, IFF_UP | IFF_RUNNING); - if (status == -1) { - close(fd); - return -1; - } - - - close(fd); - return 0; - -#elif defined (__FreeBSD__) || defined (__APPLE__) - - int fd; - struct ifaliasreq areq; - - memset(&areq, 0, sizeof(areq)); - - /* Set up interface name */ - strncpy(areq.ifra_name, devname, IFNAMSIZ); - areq.ifra_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */ - - ((struct sockaddr_in *)&areq.ifra_addr)->sin_family = AF_INET; - ((struct sockaddr_in *)&areq.ifra_addr)->sin_len = - sizeof(areq.ifra_addr); - ((struct sockaddr_in *)&areq.ifra_addr)->sin_addr.s_addr = addr->s_addr; - - ((struct sockaddr_in *)&areq.ifra_mask)->sin_family = AF_INET; - ((struct sockaddr_in *)&areq.ifra_mask)->sin_len = - sizeof(areq.ifra_mask); - ((struct sockaddr_in *)&areq.ifra_mask)->sin_addr.s_addr = - netmask->s_addr; - - /* For some reason FreeBSD uses ifra_broadcast for specifying dstaddr */ - ((struct sockaddr_in *)&areq.ifra_broadaddr)->sin_family = AF_INET; - ((struct sockaddr_in *)&areq.ifra_broadaddr)->sin_len = - sizeof(areq.ifra_broadaddr); - ((struct sockaddr_in *)&areq.ifra_broadaddr)->sin_addr.s_addr = - dstaddr->s_addr; - - /* Create a channel to the NET kernel. */ - if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); - return -1; - } - - if (ioctl(fd, SIOCAIFADDR, (void *)&areq) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "ioctl(SIOCAIFADDR) failed"); - close(fd); - return -1; - } - - close(fd); - return 0; - -#endif - -} - static int tun_addaddr4(struct tun_t *this, struct in_addr *addr, struct in_addr *dstaddr, struct in_addr *netmask) { @@ -504,161 +129,6 @@ static int tun_addaddr4(struct tun_t *this, struct in_addr *addr, return rc; } -static int netdev_addaddr6(const char *devname, struct in6_addr *addr, - struct in6_addr *dstaddr, int prefixlen) -{ - -#if defined(__linux__) - struct { - struct nlmsghdr n; - struct ifaddrmsg i; - char buf[TUN_NLBUFSIZE]; - } req; - - struct sockaddr_nl local; - socklen_t addr_len; - int fd; - int status; - - struct sockaddr_nl nladdr; - struct iovec iov; - struct msghdr msg; - - memset(&req, 0, sizeof(req)); - req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); - req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; - req.n.nlmsg_type = RTM_NEWADDR; - req.i.ifa_family = AF_INET6; - req.i.ifa_prefixlen = 64; /* 64 FOR IPv6 */ - req.i.ifa_flags = 0; - req.i.ifa_scope = RT_SCOPE_HOST; /* TODO or 0 */ - req.i.ifa_index = if_nametoindex(devname); - if (!req.i.ifa_index) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "Unable to get ifindex for %s", devname); - return -1; - } - - tun_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(*addr)); - if (dstaddr) - tun_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(*dstaddr)); - - if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); - return -1; - } - - memset(&local, 0, sizeof(local)); - local.nl_family = AF_NETLINK; - local.nl_groups = 0; - - if (bind(fd, (struct sockaddr *)&local, sizeof(local)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "bind() failed"); - close(fd); - return -1; - } - - addr_len = sizeof(local); - if (getsockname(fd, (struct sockaddr *)&local, &addr_len) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "getsockname() failed"); - close(fd); - return -1; - } - - if (addr_len != sizeof(local)) { - SYS_ERR(DTUN, LOGL_ERROR, 0, - "Wrong address length %d", addr_len); - close(fd); - return -1; - } - - if (local.nl_family != AF_NETLINK) { - SYS_ERR(DTUN, LOGL_ERROR, 0, - "Wrong address family %d", local.nl_family); - close(fd); - return -1; - } - - iov.iov_base = (void *)&req.n; - iov.iov_len = req.n.nlmsg_len; - - msg.msg_name = (void *)&nladdr; - msg.msg_namelen = sizeof(nladdr); - msg.msg_iov = &iov; - msg.msg_iovlen = 1; - msg.msg_control = NULL; - msg.msg_controllen = 0; - msg.msg_flags = 0; - - memset(&nladdr, 0, sizeof(nladdr)); - nladdr.nl_family = AF_NETLINK; - nladdr.nl_pid = 0; - nladdr.nl_groups = 0; - - req.n.nlmsg_seq = 0; - req.n.nlmsg_flags |= NLM_F_ACK; - - status = sendmsg(fd, &msg, 0); - if (status != req.n.nlmsg_len) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "sendmsg() failed, returned %d", status); - close(fd); - return -1; - } - - status = netdev_sifflags(devname, IFF_UP | IFF_RUNNING); - if (status == -1) { - close(fd); - return -1; - } - - - close(fd); - return 0; - -#elif defined (__FreeBSD__) || defined (__APPLE__) - - int fd; - struct ifaliasreq areq; - - memset(&areq, 0, sizeof(areq)); - - /* Set up interface name */ - strncpy(areq.ifra_name, devname, IFNAMSIZ); - areq.ifra_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */ - - ((struct sockaddr_in6 *)&areq.ifra_addr)->sin6_family = AF_INET6; - ((struct sockaddr_in6 *)&areq.ifra_addr)->sin6_len = sizeof(areq.ifra_addr); - ((struct sockaddr_in6 *)&areq.ifra_addr)->sin6_addr.s6_addr = addr->s6_addr; - - ((struct sockaddr_in6 *)&areq.ifra_mask)->sin6_family = AF_INET6; - ((struct sockaddr_in6 *)&areq.ifra_mask)->sin6_len = sizeof(areq.ifra_mask); - ((struct sockaddr_in6 *)&areq.ifra_mask)->sin6_addr.s6_addr = netmask->s6_addr; - - /* For some reason FreeBSD uses ifra_broadcast for specifying dstaddr */ - ((struct sockaddr_in6 *)&areq.ifra_broadaddr)->sin6_family = AF_INET6; - ((struct sockaddr_in6 *)&areq.ifra_broadaddr)->sin6_len = sizeof(areq.ifra_broadaddr); - ((struct sockaddr_in6 *)&areq.ifra_broadaddr)->sin6_addr.s6_addr = dstaddr->s6_addr; - - /* Create a channel to the NET kernel. */ - if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); - return -1; - } - - if (ioctl(fd, SIOCAIFADDR, (void *)&areq) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "ioctl(SIOCAIFADDR) failed"); - close(fd); - return -1; - } - - close(fd); - return 0; - -#endif - -} - static int tun_addaddr6(struct tun_t *this, struct in6_addr *addr, struct in6_addr *dstaddr, int prefixlen) @@ -691,115 +161,6 @@ int tun_addaddr(struct tun_t *this, struct in46_addr *addr, struct in46_addr *ds } } -static int netdev_route(struct in_addr *dst, struct in_addr *gateway, struct in_addr *mask, int delete) -{ - -#if defined(__linux__) - - struct rtentry r; - int fd; - - memset(&r, '\0', sizeof(r)); - r.rt_flags = RTF_UP | RTF_GATEWAY; /* RTF_HOST not set */ - - /* Create a channel to the NET kernel. */ - if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); - return -1; - } - - r.rt_dst.sa_family = AF_INET; - r.rt_gateway.sa_family = AF_INET; - r.rt_genmask.sa_family = AF_INET; - memcpy(&((struct sockaddr_in *)&r.rt_dst)->sin_addr, dst, sizeof(*dst)); - memcpy(&((struct sockaddr_in *)&r.rt_gateway)->sin_addr, gateway, - sizeof(*gateway)); - memcpy(&((struct sockaddr_in *)&r.rt_genmask)->sin_addr, mask, - sizeof(*mask)); - - if (delete) { - if (ioctl(fd, SIOCDELRT, (void *)&r) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "ioctl(SIOCDELRT) failed"); - close(fd); - return -1; - } - } else { - if (ioctl(fd, SIOCADDRT, (void *)&r) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, - "ioctl(SIOCADDRT) failed"); - close(fd); - return -1; - } - } - close(fd); - return 0; - -#elif defined(__FreeBSD__) || defined (__APPLE__) - - struct { - struct rt_msghdr rt; - struct sockaddr_in dst; - struct sockaddr_in gate; - struct sockaddr_in mask; - } req; - - int fd; - struct rt_msghdr *rtm; - - if ((fd = socket(AF_ROUTE, SOCK_RAW, 0)) == -1) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed"); - return -1; - } - - memset(&req, 0x00, sizeof(req)); - - rtm = &req.rt; - - rtm->rtm_msglen = sizeof(req); - rtm->rtm_version = RTM_VERSION; - if (delete) { - rtm->rtm_type = RTM_DELETE; - } else { - rtm->rtm_type = RTM_ADD; - } - rtm->rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC; /* TODO */ - rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; - rtm->rtm_pid = getpid(); - rtm->rtm_seq = 0044; /* TODO */ - - req.dst.sin_family = AF_INET; - req.dst.sin_len = sizeof(req.dst); - req.mask.sin_family = AF_INET; - req.mask.sin_len = sizeof(req.mask); - req.gate.sin_family = AF_INET; - req.gate.sin_len = sizeof(req.gate); - - req.dst.sin_addr.s_addr = dst->s_addr; - req.mask.sin_addr.s_addr = mask->s_addr; - req.gate.sin_addr.s_addr = gateway->s_addr; - - if (write(fd, rtm, rtm->rtm_msglen) < 0) { - SYS_ERR(DTUN, LOGL_ERROR, errno, "write() failed"); - close(fd); - return -1; - } - close(fd); - return 0; -#endif - -} - -int netdev_addroute(struct in_addr *dst, struct in_addr *gateway, struct in_addr *mask) -{ - return netdev_route(dst, gateway, mask, 0); -} - -int netdev_delroute(struct in_addr *dst, struct in_addr *gateway, struct in_addr *mask) -{ - return netdev_route(dst, gateway, mask, 1); -} - int tun_new(struct tun_t **tun, const char *dev_name) { @@ -966,79 +327,6 @@ int tun_runscript(struct tun_t *tun, char *script) return 0; } -#include <ifaddrs.h> - -/*! Obtain the local address of a network device - * \param[in] devname Target device owning the IP - * \param[out] prefix_list List of prefix structures to fill with each IPv4/6 and prefix length found. - * \param[in] prefix_size Amount of elements allowed to be fill in the prefix_list array. - * \param[in] flags Specify which kind of IP to look for: IP_TYPE_IPv4, IP_TYPE_IPv6_LINK, IP_TYPE_IPv6_NONLINK - * \returns The number of ips found following the criteria specified by flags, -1 on error. - * - * This function will fill prefix_list with up to prefix_size IPs following the - * criteria specified by flags parameter. It returns the number of IPs matching - * the criteria. As a result, the number returned can be bigger than - * prefix_size. It can be used with prefix_size=0 to get an estimate of the size - * needed for prefix_list. - */ -int netdev_ip_local_get(const char *devname, struct in46_prefix *prefix_list, size_t prefix_size, int flags) -{ - static const uint8_t ll_prefix[] = { 0xfe,0x80, 0,0, 0,0, 0,0 }; - struct ifaddrs *ifaddr, *ifa; - struct in46_addr netmask; - size_t count = 0; - bool is_ipv6_ll; - - if (getifaddrs(&ifaddr) == -1) { - return -1; - } - - for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { - if (ifa->ifa_addr == NULL) - continue; - - if (strcmp(ifa->ifa_name, devname)) - continue; - - if (ifa->ifa_addr->sa_family == AF_INET && (flags & IP_TYPE_IPv4)) { - struct sockaddr_in *sin4 = (struct sockaddr_in *) ifa->ifa_addr; - struct sockaddr_in *netmask4 = (struct sockaddr_in *) ifa->ifa_netmask; - - if (count < prefix_size) { - netmask.len = sizeof(netmask4->sin_addr); - netmask.v4 = netmask4->sin_addr; - prefix_list[count].addr.len = sizeof(sin4->sin_addr); - prefix_list[count].addr.v4 = sin4->sin_addr; - prefix_list[count].prefixlen = in46a_netmasklen(&netmask); - } - count++; - } - - if (ifa->ifa_addr->sa_family == AF_INET6 && (flags & IP_TYPE_IPv6)) { - struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; - struct sockaddr_in6 *netmask6 = (struct sockaddr_in6 *) ifa->ifa_netmask; - - is_ipv6_ll = !memcmp(sin6->sin6_addr.s6_addr, ll_prefix, sizeof(ll_prefix)); - if ((flags & IP_TYPE_IPv6_NONLINK) && is_ipv6_ll) - continue; - if ((flags & IP_TYPE_IPv6_LINK) && !is_ipv6_ll) - continue; - - if (count < prefix_size) { - netmask.len = sizeof(netmask6->sin6_addr); - netmask.v6 = netmask6->sin6_addr; - prefix_list[count].addr.len = sizeof(sin6->sin6_addr); - prefix_list[count].addr.v6 = sin6->sin6_addr; - prefix_list[count].prefixlen = in46a_netmasklen(&netmask); - } - count++; - } - } - - freeifaddrs(ifaddr); - return count; -} - /*! Obtain the local address of the tun device. * \param[in] tun Target device owning the IP * \param[out] prefix_list List of prefix structures to fill with each IPv4/6 and prefix length found. |