diff options
Diffstat (limited to 'ulogd/libipulog/libipulog.c')
| -rw-r--r-- | ulogd/libipulog/libipulog.c | 256 |
1 files changed, 0 insertions, 256 deletions
diff --git a/ulogd/libipulog/libipulog.c b/ulogd/libipulog/libipulog.c deleted file mode 100644 index 415b712..0000000 --- a/ulogd/libipulog/libipulog.c +++ /dev/null @@ -1,256 +0,0 @@ -/* - * libipulog.c, $Revision$ - * - * netfilter ULOG userspace library. - * - * (C) 2000-2001 by Harald Welte <laforge@gnumonks.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 - * as published by the Free Software Foundation - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * This library is still under development, so be aware of sudden interface - * changes - * - * $Id$ - */ - -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <unistd.h> -#include <net/if.h> -#include <libipulog/libipulog.h> - -struct ipulog_handle -{ - int fd; - u_int8_t blocking; - struct sockaddr_nl local; - struct sockaddr_nl peer; - struct nlmsghdr* last_nlhdr; -}; - -/* internal */ - - -int ipulog_errno = IPULOG_ERR_NONE; - -struct ipulog_errmap_t -{ - int errcode; - char *message; -} ipulog_errmap[] = -{ - { IPULOG_ERR_NONE, "No error" }, - { IPULOG_ERR_IMPL, "Not implemented yet" }, - { IPULOG_ERR_HANDLE, "Unable to create netlink handle" }, - { IPULOG_ERR_SOCKET, "Unable to create netlink socket" }, - { IPULOG_ERR_BIND, "Unable to bind netlink socket" }, - { IPULOG_ERR_RECVBUF, "Receive buffer size invalid" }, - { IPULOG_ERR_RECV, "Error during netlink receive" }, - { IPULOG_ERR_NLEOF, "Received EOF on netlink socket" }, - { IPULOG_ERR_TRUNC, "Receive message truncated" }, - { IPULOG_ERR_INVGR, "Invalid group specified" }, - { IPULOG_ERR_INVNL, "Invalid netlink message" }, -}; - -static ssize_t -ipulog_netlink_recvfrom(const struct ipulog_handle *h, - unsigned char *buf, size_t len) -{ - socklen_t addrlen; - int status; - struct nlmsghdr *nlh; - - if (len < sizeof(struct nlmsgerr)) { - ipulog_errno = IPULOG_ERR_RECVBUF; - return -1; - } - addrlen = sizeof(h->peer); - status = recvfrom(h->fd, buf, len, 0, (struct sockaddr *)&h->peer, - &addrlen); - if (status < 0) { - ipulog_errno = IPULOG_ERR_RECV; - return status; - } - if (addrlen != sizeof (h->peer)) { - ipulog_errno = IPULOG_ERR_RECV; - return -1; - } - if (h->peer.nl_pid != 0) { - ipulog_errno = IPULOG_ERR_RECV; - return -1; - } - if (status == 0) { - ipulog_errno = IPULOG_ERR_NLEOF; - return -1; - } - nlh = (struct nlmsghdr *)buf; - if (nlh->nlmsg_flags & MSG_TRUNC || status > len) { - ipulog_errno = IPULOG_ERR_TRUNC; - return -1; - } - return status; -} - -/* public */ - -char *ipulog_strerror(int errcode) -{ - if (errcode < 0 || errcode > IPULOG_MAXERR) - errcode = IPULOG_ERR_IMPL; - return ipulog_errmap[errcode].message; -} - -/* convert a netlink group (1-32) to a group_mask suitable for create_handle */ -u_int32_t ipulog_group2gmask(u_int32_t group) -{ - if (group < 1 || group > 32) - { - ipulog_errno = IPULOG_ERR_INVGR; - return 0; - } - return (1 << (group - 1)); -} - -/* create a ipulog handle for the reception of packets sent to gmask */ -struct ipulog_handle *ipulog_create_handle(u_int32_t gmask, - u_int32_t rcvbufsize) -{ - struct ipulog_handle *h; - int status; - - h = (struct ipulog_handle *) malloc(sizeof(struct ipulog_handle)); - if (h == NULL) - { - ipulog_errno = IPULOG_ERR_HANDLE; - return NULL; - } - memset(h, 0, sizeof(struct ipulog_handle)); - h->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_NFLOG); - if (h->fd == -1) - { - ipulog_errno = IPULOG_ERR_SOCKET; - close(h->fd); - free(h); - return NULL; - } - memset(&h->local, 0, sizeof(struct sockaddr_nl)); - h->local.nl_family = AF_NETLINK; - h->local.nl_pid = getpid(); - h->local.nl_groups = gmask; - status = bind(h->fd, (struct sockaddr *)&h->local, sizeof(h->local)); - if (status == -1) - { - ipulog_errno = IPULOG_ERR_BIND; - close(h->fd); - free(h); - return NULL; - } - memset(&h->peer, 0, sizeof(struct sockaddr_nl)); - h->peer.nl_family = AF_NETLINK; - h->peer.nl_pid = 0; - h->peer.nl_groups = gmask; - - status = setsockopt(h->fd, SOL_SOCKET, SO_RCVBUF, &rcvbufsize, - sizeof(rcvbufsize)); - if (status == -1) - { - ipulog_errno = IPULOG_ERR_RECVBUF; - close(h->fd); - free(h); - return NULL; - } - - return h; -} - -/* destroy a ipulog handle */ -void ipulog_destroy_handle(struct ipulog_handle *h) -{ - close(h->fd); - free(h); -} - -#if 0 -int ipulog_set_mode() -{ -} -#endif - -/* do a BLOCKING read on an ipulog handle */ -ssize_t ipulog_read(struct ipulog_handle *h, unsigned char *buf, - size_t len, int timeout) -{ - return ipulog_netlink_recvfrom(h, buf, len); -} - -/* get a pointer to the actual start of the ipulog packet, - use this to strip netlink header */ -ulog_packet_msg_t *ipulog_get_packet(struct ipulog_handle *h, - const unsigned char *buf, - size_t len) -{ - struct nlmsghdr *nlh; - size_t remain_len; - - /* if last header in handle not inside this buffer, - * drop reference to last header */ - if ((unsigned char *)h->last_nlhdr > (buf + len) || - (unsigned char *)h->last_nlhdr < buf) { - h->last_nlhdr = NULL; - } - - if (!h->last_nlhdr) { - /* fist message in buffer */ - nlh = (struct nlmsghdr *) buf; - if (!NLMSG_OK(nlh, len)) { - /* ERROR */ - ipulog_errno = IPULOG_ERR_INVNL; - return NULL; - } - } else { - /* we are in n-th part of multilink message */ - if (h->last_nlhdr->nlmsg_type == NLMSG_DONE || - !(h->last_nlhdr->nlmsg_flags & NLM_F_MULTI)) { - /* if last part in multilink message, - * or no multipart message at all: return */ - h->last_nlhdr = NULL; - return NULL; - } - - /* calculate remaining lenght from lasthdr to end of buffer */ - remain_len = (len - - ((unsigned char *)h->last_nlhdr - buf)); - nlh = NLMSG_NEXT(h->last_nlhdr, remain_len); - } - - h->last_nlhdr = nlh; - - return NLMSG_DATA(nlh); -} - -/* print a human readable description of the last error to stderr */ -void ipulog_perror(const char *s) -{ - if (s) - fputs(s, stderr); - else - fputs("ERROR", stderr); - if (ipulog_errno) - fprintf(stderr, ": %s", ipulog_strerror(ipulog_errno)); - if (errno) - fprintf(stderr, ": %s", strerror(errno)); - fputc('\n', stderr); -} - |