diff options
Diffstat (limited to 'vag-bap-sniffer.c')
-rw-r--r-- | vag-bap-sniffer.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/vag-bap-sniffer.c b/vag-bap-sniffer.c new file mode 100644 index 0000000..1c17a25 --- /dev/null +++ b/vag-bap-sniffer.c @@ -0,0 +1,184 @@ +/* + * Copyright 2017 Max Staudt + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License 2 as published + * by the Free Software Foundation. + */ + +#include <stdio.h> +#include <stdint.h> +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <linux/can.h> +#include <linux/can/raw.h> +#include <net/if.h> +#include <sys/ioctl.h> + +#include <ncurses.h> + +#include "vag-bap.h" + + + + +static int net_init(char *ifname) +{ + int s; + int recv_own_msgs; + struct sockaddr_can addr; + struct ifreq ifr; + + s = socket(PF_CAN, SOCK_RAW, CAN_RAW); + if (s < 0) { + perror("socket"); + exit(1); + } + + /* Convert interface name to index */ + memset(&ifr.ifr_name, 0, sizeof(ifr.ifr_name)); + strncpy(ifr.ifr_name, ifname, IFNAMSIZ); + if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) { + perror("SIOCGIFINDEX"); + exit(1); + } + + /* Open the CAN interface */ + memset(&addr, 0, sizeof(addr)); + addr.can_family = AF_CAN; + addr.can_ifindex = ifr.ifr_ifindex; + if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) { + perror("bind"); + return 0; + } + + recv_own_msgs = 1; /* 0 = disabled (default), 1 = enabled */ + setsockopt(s, SOL_CAN_RAW, CAN_RAW_RECV_OWN_MSGS, + &recv_own_msgs, sizeof(recv_own_msgs)); + + return s; +} + + + + + +int main(int argc, char **argv) +{ + fd_set rdfs; + int s; + unsigned can_id; + struct BAP_RXer *bap; + unsigned node_id; + + if (argc < 4) { + printf("syntax: %s IFNAME CAN_ID bap_node \n", argv[0]); + return 1; + } + + can_id = strtoul(argv[2], NULL, 0); + node_id = strtoul(argv[3], NULL, 0); + + bap = vag_bap_rxer_alloc(); + if (!bap) { + printf("Out of memory allocating BAP struct.\n"); + return 1; + } + + printf("Listening for CAN ID: %x and Node %d\n", can_id, node_id); + + + + s = net_init(argv[1]); + + + initscr(); + + + while (1) { + int retval; + + FD_ZERO(&rdfs); + FD_SET(s, &rdfs); + + retval = select(s+1, &rdfs, NULL, NULL, NULL); + /* We currently rely on Linux timeout behavior here, + * i.e. the timeout now reflects the remaining time */ + if (retval < 0) { + perror("select"); + return 1; + } else if (!retval) { + /* Timeout, we NEED to check this first */ + } else if (FD_ISSET(s, &rdfs)) { + struct can_frame frame; + ssize_t ret; + + ret = read(s, &frame, sizeof(frame)); + if (ret < 0) { + perror("read from CAN socket"); + return 1; + } + + if (can_id == frame.can_id) { + struct BAP_Frame *bap_frame; + unsigned i; + + bap_frame = vag_bap_handle_can_frame(bap, &frame); + if (bap_frame && bap_frame->node == node_id) { + mvprintw(bap_frame->port, 0, ""); + + printw("%u. %2i/%-2i .%c%02i --", + bap_frame->opcode, + bap_frame->node, + bap_frame->port, + bap_frame->is_multiframe ? 'm' : 's', + bap_frame->len); + + /* Limit huge packets */ + if (bap_frame->len > 20) { + bap_frame->len = 20; + } + + /* Hex dump */ + for (i = 0; i < bap_frame->len; i++) { + if (!(i % 4)) { + printw(" "); + } + printw("%02x", (unsigned char)(bap_frame->data[i])); + } + + printw("\n"); + + /* ASCII dump */ + mvprintw(bap_frame->port, 64, ""); + for (i = 0; i < bap_frame->len; i++) { + unsigned char c = bap_frame->data[i]; + if (!isprint(c) || c == '\n' || c == '\r') { + c = '.'; + } + printw("%c", c); + } + printw("'"); + printw("\r"); + + refresh(); + + vag_bap_frame_free(bap_frame); + } + } + + continue; + } + } + + endwin(); + + vag_bap_rxer_free(bap); + + close(s); + + return 0; +} |