void nfnl_dump_packet(struct nlmsghdr *nlh, int received_len, char *desc) { void *nlmsg_data = NLMSG_DATA(nlh); struct nfattr *nfa = NFM_NFA(NLMSG_DATA(nlh)); int len = NFM_PAYLOAD(nlh); printf("%s called from %s\n", __FUNCTION__, desc); printf(" nlmsghdr = %p, received_len = %u\n", nlh, received_len); printf(" NLMSG_DATA(nlh) = %p (+%td bytes)\n", nlmsg_data, (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); while (NFA_OK(nfa, len)) { printf(" nfa@%p: nfa_type=%u, nfa_len=%u\n", nfa, NFA_TYPE(nfa), nfa->nfa_len); nfa = NFA_NEXT(nfa,len); } }
ulog_packet_msg_t *ipulog_get_packet(struct ipulog_handle *h, const unsigned char *buf, size_t len) { struct nlmsghdr *nlh; struct nfattr *tb[NFULA_MAX]; struct nfulnl_msg_packet_hdr *hdr; if (!h->last_nlh) { printf("first\n"); nlh = nfnl_get_msg_first(nflog_nfnlh(h->nfulh), buf, len); }else { next_msg: printf("next\n"); nlh = nfnl_get_msg_next(nflog_nfnlh(h->nfulh), buf, len); } h->last_nlh = nlh; if (!nlh) return NULL; nfnl_parse_attr(tb, NFULA_MAX, NFM_NFA(NLMSG_DATA(nlh)), NFM_PAYLOAD(nlh)); if (!tb[NFULA_PACKET_HDR-1]) goto next_msg; /* now build the fake ulog_packet_msg */ hdr = NFA_DATA(tb[NFULA_PACKET_HDR-1]); h->upmsg.hook = hdr->hook; if (tb[NFULA_MARK-1]) h->upmsg.mark = ntohl(*(u_int32_t *)NFA_DATA(tb[NFULA_MARK-1])); else h->upmsg.mark = 0; if (tb[NFULA_TIMESTAMP]) { /* FIXME: 64bit network-to-host */ h->upmsg.timestamp_sec = h->upmsg.timestamp_usec = 0; } else h->upmsg.timestamp_sec = h->upmsg.timestamp_usec = 0; if (tb[NFULA_IFINDEX_INDEV-1]) { /* FIXME: ifindex lookup */ h->upmsg.indev_name[0] = '\0'; } else h->upmsg.indev_name[0] = '\0'; if (tb[NFULA_IFINDEX_OUTDEV-1]) { /* FIXME: ifindex lookup */ h->upmsg.outdev_name[0] = '\0'; } else h->upmsg.outdev_name[0] = '\0'; if (tb[NFULA_HWADDR-1]) { struct nfulnl_msg_packet_hw *phw = NFA_DATA(tb[NFULA_HWADDR-1]); h->upmsg.mac_len = ntohs(phw->hw_addrlen); memcpy(h->upmsg.mac, phw->hw_addr, 8); } else h->upmsg.mac_len = 0; if (tb[NFULA_PREFIX-1]) { int plen = NFA_PAYLOAD(tb[NFULA_PREFIX-1]); if (ULOG_PREFIX_LEN < plen) plen = ULOG_PREFIX_LEN; memcpy(h->upmsg.prefix, NFA_DATA(tb[NFULA_PREFIX-1]), plen); h->upmsg.prefix[ULOG_PREFIX_LEN-1] = '\0'; } if (tb[NFULA_PAYLOAD-1]) { memcpy(h->upmsg.payload, NFA_DATA(tb[NFULA_PAYLOAD-1]), NFA_PAYLOAD(tb[NFULA_PAYLOAD-1])); h->upmsg.data_len = NFA_PAYLOAD(tb[NFULA_PAYLOAD-1]); } else h->upmsg.data_len = 0; return &h->upmsg; }