diff options
Diffstat (limited to 'src/libnfnetlink.c')
| -rw-r--r-- | src/libnfnetlink.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/libnfnetlink.c b/src/libnfnetlink.c index c6ccc4b..37cea70 100644 --- a/src/libnfnetlink.c +++ b/src/libnfnetlink.c @@ -43,6 +43,7 @@ void nfnl_dump_packet(struct nlmsghdr *nlh, int received_len, char *desc) (nlmsg_data - (void *)nlh)); printf(" NFM_NFA(NLMSG_DATA(nlh)) = %p (+%td bytes)\n", nfa, ((void *)nfa - (void *)nlh)); + printf(" NFM_PAYLOAD(nlh) = %u\n", len); printf(" nlmsg_type = %u, nlmsg_len = %u, nlmsg_seq = %u " "nlmsg_flags = 0x%x\n", nlh->nlmsg_type, nlh->nlmsg_len, nlh->nlmsg_seq, nlh->nlmsg_flags); @@ -221,6 +222,36 @@ nfnl_parse_hdr(const struct nfnl_handle *nfnlh, return ((void *)nlh + NLMSG_LENGTH(sizeof(struct nfgenmsg))); } +ssize_t +nfnl_recv(const struct nfnl_handle *h, unsigned char *buf, size_t len) +{ + socklen_t addrlen; + int status; + struct nlmsghdr *nlh; + struct sockaddr_nl peer; + + if (len < sizeof(struct nlmsgerr) + || len < sizeof(struct nlmsghdr)) + return -1; + + addrlen = sizeof(h->peer); + status = recvfrom(h->fd, buf, len, 0, (struct sockaddr *)&peer, + &addrlen); + if (status <= 0) + return status; + + if (addrlen != sizeof(peer)) + return -1; + + if (peer.nl_pid != 0) + return -1; + + nlh = (struct nlmsghdr *)buf; + if (nlh->nlmsg_flags & MSG_TRUNC || status > len) + return -1; + + return status; +} /** * nfnl_listen: listen for one or more netlink messages * |