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-rw-r--r--package/iwcap/Makefile50
-rw-r--r--package/iwcap/src/iwcap.c582
2 files changed, 0 insertions, 632 deletions
diff --git a/package/iwcap/Makefile b/package/iwcap/Makefile
deleted file mode 100644
index b406bdfb4f..0000000000
--- a/package/iwcap/Makefile
+++ /dev/null
@@ -1,50 +0,0 @@
-#
-# Copyright (C) 2012 Jo-Philipp Wich <jow@openwrt.org>
-#
-# This is free software, licensed under the Apache 2 license.
-#
-
-include $(TOPDIR)/rules.mk
-
-PKG_NAME:=iwcap
-PKG_RELEASE:=1
-
-include $(INCLUDE_DIR)/package.mk
-
-
-define Package/iwcap
- SECTION:=utils
- CATEGORY:=Utilities
- TITLE:=Simple radiotap capture utility
- MAINTAINER:=Jo-Philipp Wich <jow@openwrt.org>
-endef
-
-define Package/iwcap/description
- The iwcap utility receives radiotap packet data from wifi monitor interfaces
- and outputs it to pcap format. It gathers recived packets in a fixed ring
- buffer to dump them on demand which is useful for background monitoring.
- Alternatively the utility can stream the data to stdout to act as remote
- capture drone for Wireshark or similar programs.
-endef
-
-
-define Build/Prepare
- $(INSTALL_DIR) $(PKG_BUILD_DIR)
- $(CP) ./src/* $(PKG_BUILD_DIR)/
-endef
-
-define Build/Configure
-endef
-
-define Build/Compile
- $(TARGET_CC) $(TARGET_CFLAGS) \
- -o $(PKG_BUILD_DIR)/iwcap $(PKG_BUILD_DIR)/iwcap.c
-endef
-
-
-define Package/iwcap/install
- $(INSTALL_DIR) $(1)/usr/sbin
- $(INSTALL_BIN) $(PKG_BUILD_DIR)/iwcap $(1)/usr/sbin/iwcap
-endef
-
-$(eval $(call BuildPackage,iwcap))
diff --git a/package/iwcap/src/iwcap.c b/package/iwcap/src/iwcap.c
deleted file mode 100644
index a71dca2320..0000000000
--- a/package/iwcap/src/iwcap.c
+++ /dev/null
@@ -1,582 +0,0 @@
-/*
- * iwcap.c - A simply radiotap capture utility outputting pcap dumps
- *
- * Copyright 2012 Jo-Philipp Wich <jow@openwrt.org>
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-#include <stdio.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <string.h>
-#include <signal.h>
-#include <syslog.h>
-#include <errno.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <sys/ioctl.h>
-#include <sys/socket.h>
-#include <net/ethernet.h>
-#include <net/if.h>
-#include <netinet/in.h>
-#include <linux/if_packet.h>
-
-#define ARPHRD_IEEE80211_RADIOTAP 803
-
-#define DLT_IEEE802_11_RADIO 127
-#define LEN_IEEE802_11_HDR 32
-
-#define FRAMETYPE_MASK 0xFC
-#define FRAMETYPE_BEACON 0x80
-#define FRAMETYPE_DATA 0x08
-
-#if __BYTE_ORDER == __BIG_ENDIAN
-#define le16(x) __bswap_16(x)
-#else
-#define le16(x) (x)
-#endif
-
-uint8_t run_dump = 0;
-uint8_t run_stop = 0;
-uint8_t run_daemon = 0;
-
-uint32_t frames_captured = 0;
-uint32_t frames_filtered = 0;
-
-int capture_sock = -1;
-const char *ifname = NULL;
-
-
-struct ringbuf {
- uint32_t len; /* number of slots */
- uint32_t fill; /* last used slot */
- uint32_t slen; /* slot size */
- void *buf; /* ring memory */
-};
-
-struct ringbuf_entry {
- uint32_t len; /* used slot memory */
- uint32_t olen; /* original data size */
- uint32_t sec; /* epoch of slot creation */
- uint32_t usec; /* epoch microseconds */
-};
-
-typedef struct pcap_hdr_s {
- uint32_t magic_number; /* magic number */
- uint16_t version_major; /* major version number */
- uint16_t version_minor; /* minor version number */
- int32_t thiszone; /* GMT to local correction */
- uint32_t sigfigs; /* accuracy of timestamps */
- uint32_t snaplen; /* max length of captured packets, in octets */
- uint32_t network; /* data link type */
-} pcap_hdr_t;
-
-typedef struct pcaprec_hdr_s {
- uint32_t ts_sec; /* timestamp seconds */
- uint32_t ts_usec; /* timestamp microseconds */
- uint32_t incl_len; /* number of octets of packet saved in file */
- uint32_t orig_len; /* actual length of packet */
-} pcaprec_hdr_t;
-
-typedef struct ieee80211_radiotap_header {
- u_int8_t it_version; /* set to 0 */
- u_int8_t it_pad;
- u_int16_t it_len; /* entire length */
- u_int32_t it_present; /* fields present */
-} __attribute__((__packed__)) radiotap_hdr_t;
-
-
-int check_type(void)
-{
- struct ifreq ifr;
-
- strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
-
- if (ioctl(capture_sock, SIOCGIFHWADDR, &ifr) < 0)
- return -1;
-
- return (ifr.ifr_hwaddr.sa_family == ARPHRD_IEEE80211_RADIOTAP);
-}
-
-int set_promisc(int on)
-{
- struct ifreq ifr;
-
- strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
-
- if (ioctl(capture_sock, SIOCGIFFLAGS, &ifr) < 0)
- return -1;
-
- if (on && !(ifr.ifr_flags & IFF_PROMISC))
- {
- ifr.ifr_flags |= IFF_PROMISC;
-
- if (ioctl(capture_sock, SIOCSIFFLAGS, &ifr))
- return -1;
-
- return 1;
- }
- else if (!on && (ifr.ifr_flags & IFF_PROMISC))
- {
- ifr.ifr_flags &= ~IFF_PROMISC;
-
- if (ioctl(capture_sock, SIOCSIFFLAGS, &ifr))
- return -1;
-
- return 1;
- }
-
- return 0;
-}
-
-
-void sig_dump(int sig)
-{
- run_dump = 1;
-}
-
-void sig_teardown(int sig)
-{
- run_stop = 1;
-}
-
-
-void write_pcap_header(FILE *o)
-{
- pcap_hdr_t ghdr = {
- .magic_number = 0xa1b2c3d4,
- .version_major = 2,
- .version_minor = 4,
- .thiszone = 0,
- .sigfigs = 0,
- .snaplen = 0xFFFF,
- .network = DLT_IEEE802_11_RADIO
- };
-
- fwrite(&ghdr, 1, sizeof(ghdr), o);
-}
-
-void write_pcap_frame(FILE *o, uint32_t *sec, uint32_t *usec,
- uint16_t len, uint16_t olen)
-{
- struct timeval tv;
- pcaprec_hdr_t fhdr;
-
- if (!sec || !usec)
- {
- gettimeofday(&tv, NULL);
- }
- else
- {
- tv.tv_sec = *sec;
- tv.tv_usec = *usec;
- }
-
- fhdr.ts_sec = tv.tv_sec;
- fhdr.ts_usec = tv.tv_usec;
- fhdr.incl_len = len;
- fhdr.orig_len = olen;
-
- fwrite(&fhdr, 1, sizeof(fhdr), o);
-}
-
-
-struct ringbuf * ringbuf_init(uint32_t num_item, uint16_t len_item)
-{
- static struct ringbuf r;
-
- if (len_item <= 0)
- return NULL;
-
- r.buf = malloc(num_item * (len_item + sizeof(struct ringbuf_entry)));
-
- if (r.buf)
- {
- r.len = num_item;
- r.fill = 0;
- r.slen = (len_item + sizeof(struct ringbuf_entry));
-
- memset(r.buf, 0, num_item * len_item);
-
- return &r;
- }
-
- return NULL;
-}
-
-struct ringbuf_entry * ringbuf_add(struct ringbuf *r)
-{
- struct timeval t;
- struct ringbuf_entry *e;
-
- gettimeofday(&t, NULL);
-
- e = r->buf + (r->fill++ * r->slen);
- r->fill %= r->len;
-
- memset(e, 0, r->slen);
-
- e->sec = t.tv_sec;
- e->usec = t.tv_usec;
-
- return e;
-}
-
-struct ringbuf_entry * ringbuf_get(struct ringbuf *r, int i)
-{
- struct ringbuf_entry *e = r->buf + (((r->fill + i) % r->len) * r->slen);
-
- if (e->len > 0)
- return e;
-
- return NULL;
-}
-
-void ringbuf_free(struct ringbuf *r)
-{
- free(r->buf);
- memset(r, 0, sizeof(*r));
-}
-
-
-void msg(const char *fmt, ...)
-{
- va_list ap;
- va_start(ap, fmt);
-
- if (run_daemon)
- vsyslog(LOG_INFO | LOG_USER, fmt, ap);
- else
- vfprintf(stderr, fmt, ap);
-
- va_end(ap);
-}
-
-
-int main(int argc, char **argv)
-{
- int i, n;
- struct ringbuf *ring;
- struct ringbuf_entry *e;
- struct sockaddr_ll local = {
- .sll_family = AF_PACKET,
- .sll_protocol = htons(ETH_P_ALL)
- };
-
- radiotap_hdr_t *rhdr;
-
- uint8_t frametype;
- uint8_t pktbuf[0xFFFF];
- ssize_t pktlen;
-
- FILE *o;
-
- int opt;
-
- uint8_t promisc = 0;
- uint8_t streaming = 0;
- uint8_t foreground = 0;
- uint8_t filter_data = 0;
- uint8_t filter_beacon = 0;
- uint8_t header_written = 0;
-
- uint32_t ringsz = 1024 * 1024; /* 1 Mbyte ring buffer */
- uint16_t pktcap = 256; /* truncate frames after 265KB */
-
- const char *output = NULL;
-
-
- while ((opt = getopt(argc, argv, "i:r:c:o:sfhBD")) != -1)
- {
- switch (opt)
- {
- case 'i':
- ifname = optarg;
- if (!(local.sll_ifindex = if_nametoindex(ifname)))
- {
- msg("Unknown interface '%s'\n", ifname);
- return 2;
- }
- break;
-
- case 'r':
- ringsz = atoi(optarg);
- if (ringsz < (3 * pktcap))
- {
- msg("Ring size of %d bytes is too short, "
- "must be at least %d bytes\n", ringsz, 3 * pktcap);
- return 3;
- }
- break;
-
- case 'c':
- pktcap = atoi(optarg);
- if (pktcap <= (sizeof(radiotap_hdr_t) + LEN_IEEE802_11_HDR))
- {
- msg("Packet truncate after %d bytes is too short, "
- "must be at least %d bytes\n",
- pktcap, sizeof(radiotap_hdr_t) + LEN_IEEE802_11_HDR);
- return 4;
- }
- break;
-
- case 's':
- streaming = 1;
- break;
-
- case 'o':
- output = optarg;
- break;
-
- case 'B':
- filter_beacon = 1;
- break;
-
- case 'D':
- filter_data = 1;
- break;
-
- case 'f':
- foreground = 1;
- break;
-
- case 'h':
- msg(
- "Usage:\n"
- " %s -i {iface} -s [-b] [-d]\n"
- " %s -i {iface} -o {file} [-r len] [-c len] [-B] [-D] [-f]\n"
- "\n"
- " -i iface\n"
- " Specify interface to use, must be in monitor mode and\n"
- " produce IEEE 802.11 Radiotap headers.\n\n"
- " -s\n"
- " Stream to stdout instead of Dumping to file on USR1.\n\n"
- " -o file\n"
- " Write current ringbuffer contents to given output file\n"
- " on receipt of SIGUSR1.\n\n"
- " -r len\n"
- " Specify the amount of bytes to use for the ringbuffer.\n"
- " The default length is %d bytes.\n\n"
- " -c len\n"
- " Truncate captured packets after given amount of bytes.\n"
- " The default size limit is %d bytes.\n\n"
- " -B\n"
- " Don't store beacon frames in ring, default is keep.\n\n"
- " -D\n"
- " Don't store data frames in ring, default is keep.\n\n"
- " -f\n"
- " Do not daemonize but keep running in foreground.\n\n"
- " -h\n"
- " Display this help.\n\n",
- argv[0], argv[0], ringsz, pktcap);
-
- return 1;
- }
- }
-
- if (!streaming && !output)
- {
- msg("No output file specified\n");
- return 1;
- }
-
- if (streaming && output)
- {
- msg("The -s and -o options are exclusive\n");
- return 1;
- }
-
- if (streaming && isatty(1))
- {
- msg("Refusing to stream into a terminal\n");
- return 1;
- }
-
- if (!local.sll_ifindex)
- {
- msg("No interface specified\n");
- return 2;
- }
-
- if (!check_type())
- {
- msg("Bad interface: not ARPHRD_IEEE80211_RADIOTAP\n");
- return 2;
- }
-
- if ((capture_sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0)
- {
- msg("Unable to create raw socket: %s\n",
- strerror(errno));
- return 6;
- }
-
- if (bind(capture_sock, (struct sockaddr *)&local, sizeof(local)) == -1)
- {
- msg("Unable to bind to interface: %s\n",
- strerror(errno));
- return 7;
- }
-
- if (!streaming)
- {
- if (!foreground)
- {
- switch (fork())
- {
- case -1:
- msg("Unable to fork: %s\n", strerror(errno));
- return 8;
-
- case 0:
- umask(0077);
- chdir("/");
- freopen("/dev/null", "r", stdin);
- freopen("/dev/null", "w", stdout);
- freopen("/dev/null", "w", stderr);
- run_daemon = 1;
- break;
-
- default:
- msg("Daemon launched ...\n");
- return 0;
- }
- }
-
- msg("Monitoring interface %s ...\n", ifname);
-
- if (!(ring = ringbuf_init(ringsz / pktcap, pktcap)))
- {
- msg("Unable to allocate ring buffer: %s\n",
- strerror(errno));
- return 5;
- }
-
- msg(" * Using %d bytes ringbuffer with %d slots\n", ringsz, ring->len);
- msg(" * Truncating frames at %d bytes\n", pktcap);
- msg(" * Dumping data to file %s\n", output);
-
- signal(SIGUSR1, sig_dump);
- }
- else
- {
- msg("Monitoring interface %s ...\n", ifname);
- msg(" * Streaming data to stdout\n");
- }
-
- msg(" * Beacon frames are %sfiltered\n", filter_beacon ? "" : "not ");
- msg(" * Data frames are %sfiltered\n", filter_data ? "" : "not ");
-
- signal(SIGINT, sig_teardown);
- signal(SIGTERM, sig_teardown);
-
- promisc = set_promisc(1);
-
- /* capture loop */
- while (1)
- {
- if (run_stop)
- {
- msg("Shutting down ...\n");
-
- if (promisc)
- set_promisc(0);
-
- if (ring)
- ringbuf_free(ring);
-
- return 0;
- }
- else if (run_dump)
- {
- msg("Dumping ring to %s ...\n", output);
-
- if (!(o = fopen(output, "w")))
- {
- msg("Unable to open %s: %s\n",
- output, strerror(errno));
- }
- else
- {
- write_pcap_header(o);
-
- /* sig_dump packet buffer */
- for (i = 0, n = 0; i < ring->len; i++)
- {
- if (!(e = ringbuf_get(ring, i)))
- continue;
-
- write_pcap_frame(o, &(e->sec), &(e->usec), e->len, e->olen);
- fwrite((void *)e + sizeof(*e), 1, e->len, o);
- n++;
- }
-
- fclose(o);
-
- msg(" * %d frames captured\n", frames_captured);
- msg(" * %d frames filtered\n", frames_filtered);
- msg(" * %d frames dumped\n", n);
- }
-
- run_dump = 0;
- }
-
- pktlen = recvfrom(capture_sock, pktbuf, sizeof(pktbuf), 0, NULL, 0);
- frames_captured++;
-
- /* check received frametype, if we should filter it, rewind the ring */
- rhdr = (radiotap_hdr_t *)pktbuf;
-
- if (pktlen <= sizeof(radiotap_hdr_t) || le16(rhdr->it_len) >= pktlen)
- {
- frames_filtered++;
- continue;
- }
-
- frametype = *(uint8_t *)(pktbuf + le16(rhdr->it_len));
-
- if ((filter_data && (frametype & FRAMETYPE_MASK) == FRAMETYPE_DATA) ||
- (filter_beacon && (frametype & FRAMETYPE_MASK) == FRAMETYPE_BEACON))
- {
- frames_filtered++;
- continue;
- }
-
- if (streaming)
- {
- if (!header_written)
- {
- write_pcap_header(stdout);
- header_written = 1;
- }
-
- write_pcap_frame(stdout, NULL, NULL, pktlen, pktlen);
- fwrite(pktbuf, 1, pktlen, stdout);
- fflush(stdout);
- }
- else
- {
- e = ringbuf_add(ring);
- e->olen = pktlen;
- e->len = (pktlen > pktcap) ? pktcap : pktlen;
-
- memcpy((void *)e + sizeof(*e), pktbuf, e->len);
- }
- }
-
- return 0;
-}
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