static int
netlink_parse_response(const void *data, const int data_len,
const unsigned long inode, void *opaque_data)
{
const char *proto_name = opaque_data;
const struct netlink_diag_msg *const diag_msg = data;
const char *netlink_proto;
char *details;
if (data_len < (int) NLMSG_LENGTH(sizeof(*diag_msg)))
return -1;
if (diag_msg->ndiag_ino != inode)
return 0;
if (diag_msg->ndiag_family != AF_NETLINK)
return -1;
netlink_proto = xlookup(netlink_protocols,
diag_msg->ndiag_protocol);
if (netlink_proto) {
netlink_proto = STR_STRIP_PREFIX(netlink_proto, "NETLINK_");
if (asprintf(&details, "%s:[%s:%u]", proto_name,
netlink_proto, diag_msg->ndiag_portid) < 0)
return -1;
} else {
if (asprintf(&details, "%s:[%u]", proto_name,
(unsigned) diag_msg->ndiag_protocol) < 0)
return -1;
}
return cache_inode_details(inode, details);
}
static int
inet_parse_response(const void *const data, const int data_len,
const unsigned long inode, void *opaque_data)
{
const char *const proto_name = opaque_data;
const struct inet_diag_msg *const diag_msg = data;
static const char zero_addr[sizeof(struct in6_addr)];
socklen_t addr_size, text_size;
if (data_len < (int) NLMSG_LENGTH(sizeof(*diag_msg)))
return -1;
if (diag_msg->idiag_inode != inode)
return 0;
switch (diag_msg->idiag_family) {
case AF_INET:
addr_size = sizeof(struct in_addr);
text_size = INET_ADDRSTRLEN;
break;
case AF_INET6:
addr_size = sizeof(struct in6_addr);
text_size = INET6_ADDRSTRLEN;
break;
default:
return -1;
}
char src_buf[text_size];
char *details;
/* open/closing brackets for IPv6 addresses */
const char *ob = diag_msg->idiag_family == AF_INET6 ? "[" : "";
const char *cb = diag_msg->idiag_family == AF_INET6 ? "]" : "";
if (!inet_ntop(diag_msg->idiag_family, diag_msg->id.idiag_src,
src_buf, text_size))
return -1;
if (diag_msg->id.idiag_dport ||
memcmp(zero_addr, diag_msg->id.idiag_dst, addr_size)) {
char dst_buf[text_size];
if (!inet_ntop(diag_msg->idiag_family, diag_msg->id.idiag_dst,
dst_buf, text_size))
return -1;
if (asprintf(&details, "%s:[%s%s%s:%u->%s%s%s:%u]", proto_name,
ob, src_buf, cb, ntohs(diag_msg->id.idiag_sport),
ob, dst_buf, cb, ntohs(diag_msg->id.idiag_dport))
< 0)
return false;
} else {
if (asprintf(&details, "%s:[%s%s%s:%u]",
proto_name, ob, src_buf, cb,
ntohs(diag_msg->id.idiag_sport)) < 0)
return false;
}
return cache_inode_details(inode, details);
}
static bool
receive_responses(struct tcb *tcp, const int fd, const unsigned long inode,
const unsigned long expected_msg_type,
int (*parser)(const void *, int,
unsigned long, void *),
void *opaque_data)
{
static union {
struct nlmsghdr hdr;
long buf[8192 / sizeof(long)];
} hdr_buf;
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK
};
struct iovec iov = {
.iov_base = hdr_buf.buf,
.iov_len = sizeof(hdr_buf.buf)
};
int flags = 0;
for (;;) {
struct msghdr msg = {
.msg_name = &nladdr,
.msg_namelen = sizeof(nladdr),
.msg_iov = &iov,
.msg_iovlen = 1
};
ssize_t ret = recvmsg(fd, &msg, flags);
if (ret < 0) {
if (errno == EINTR)
continue;
return false;
}
const struct nlmsghdr *h = &hdr_buf.hdr;
if (!NLMSG_OK(h, ret))
return false;
for (; NLMSG_OK(h, ret); h = NLMSG_NEXT(h, ret)) {
if (h->nlmsg_type != expected_msg_type)
return false;
const int rc = parser(NLMSG_DATA(h),
h->nlmsg_len, inode, opaque_data);
if (rc > 0)
return true;
if (rc < 0)
return false;
}
flags = MSG_DONTWAIT;
}
}
static bool
unix_send_query(struct tcb *tcp, const int fd, const unsigned long inode)
{
struct {
const struct nlmsghdr nlh;
const struct unix_diag_req udr;
} req = {
.nlh = {
.nlmsg_len = sizeof(req),
.nlmsg_type = SOCK_DIAG_BY_FAMILY,
.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
},
.udr = {
.sdiag_family = AF_UNIX,
.udiag_ino = inode,
.udiag_states = -1,
.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
}
};
return send_query(tcp, fd, &req, sizeof(req));
}
static int
unix_parse_response(const void *data, const int data_len,
const unsigned long inode, void *opaque_data)
{
const char *proto_name = opaque_data;
const struct unix_diag_msg *diag_msg = data;
struct rtattr *attr;
int rta_len = data_len - NLMSG_LENGTH(sizeof(*diag_msg));
uint32_t peer = 0;
size_t path_len = 0;
char path[UNIX_PATH_MAX + 1];
if (rta_len < 0)
return -1;
if (diag_msg->udiag_ino != inode)
return 0;
if (diag_msg->udiag_family != AF_UNIX)
return -1;
for (attr = (struct rtattr *) (diag_msg + 1);
RTA_OK(attr, rta_len);
attr = RTA_NEXT(attr, rta_len)) {
switch (attr->rta_type) {
case UNIX_DIAG_NAME:
if (!path_len) {
path_len = RTA_PAYLOAD(attr);
if (path_len > UNIX_PATH_MAX)
path_len = UNIX_PATH_MAX;
memcpy(path, RTA_DATA(attr), path_len);
path[path_len] = '\0';
}
break;
case UNIX_DIAG_PEER:
if (RTA_PAYLOAD(attr) >= 4)
peer = *(uint32_t *) RTA_DATA(attr);
break;
}
}
/*
* print obtained information in the following format:
* "UNIX:[" SELF_INODE [ "->" PEER_INODE ][ "," SOCKET_FILE ] "]"
*/
if (!peer && !path_len)
return -1;
char peer_str[3 + sizeof(peer) * 3];
if (peer)
xsprintf(peer_str, "->%u", peer);
else
peer_str[0] = '\0';
const char *path_str;
if (path_len) {
char *outstr = alloca(4 * path_len + 4);
outstr[0] = ',';
if (path[0] == '\0') {
outstr[1] = '@';
string_quote(path + 1, outstr + 2,
path_len - 1, QUOTE_0_TERMINATED);
} else {
string_quote(path, outstr + 1,
path_len, QUOTE_0_TERMINATED);
}
path_str = outstr;
} else {
path_str = "";
}
char *details;
if (asprintf(&details, "%s:[%lu%s%s]", proto_name, inode,
peer_str, path_str) < 0)
return -1;
return cache_inode_details(inode, details);
}
static bool
netlink_send_query(struct tcb *tcp, const int fd, const unsigned long inode)
{
struct {
const struct nlmsghdr nlh;
const struct netlink_diag_req ndr;
} req = {
.nlh = {
.nlmsg_len = sizeof(req),
.nlmsg_type = SOCK_DIAG_BY_FAMILY,
.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
},
.ndr = {
.sdiag_family = AF_NETLINK,
.sdiag_protocol = NDIAG_PROTO_ALL,
.ndiag_show = NDIAG_SHOW_MEMINFO
}
};
return send_query(tcp, fd, &req, sizeof(req));
}
