diff --git a/dist/tools/ethos/LICENSE b/dist/tools/ethos/LICENSE new file mode 100644 index 0000000000..d159169d10 --- /dev/null +++ b/dist/tools/ethos/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Lesser General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +this service if you wish), that you receive source code or can get it +if you want it, that you can change the software or use pieces of it +in new free programs; and that you know you can do these things. + + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. You must make sure that they, too, receive or can get the +source code. And you must show them these terms so they know their +rights. + + We protect your rights with two steps: (1) copyright the software, and +(2) offer you this license which gives you legal permission to copy, +distribute and/or modify the software. + + Also, for each author's protection and ours, we want to make certain +that everyone understands that there is no warranty for this free +software. If the software is modified by someone else and passed on, we +want its recipients to know that what they have is not the original, so +that any problems introduced by others will not reflect on the original +authors' reputations. + + Finally, any free program is threatened constantly by software +patents. We wish to avoid the danger that redistributors of a free +program will individually obtain patent licenses, in effect making the +program proprietary. To prevent this, we have made it clear that any +patent must be licensed for everyone's free use or not licensed at all. + + The precise terms and conditions for copying, distribution and +modification follow. + + GNU GENERAL PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. This License applies to any program or other work which contains +a notice placed by the copyright holder saying it may be distributed +under the terms of this General Public License. The "Program", below, +refers to any such program or work, and a "work based on the Program" +means either the Program or any derivative work under copyright law: +that is to say, a work containing the Program or a portion of it, +either verbatim or with modifications and/or translated into another +language. (Hereinafter, translation is included without limitation in +the term "modification".) Each licensee is addressed as "you". + +Activities other than copying, distribution and modification are not +covered by this License; they are outside its scope. The act of +running the Program is not restricted, and the output from the Program +is covered only if its contents constitute a work based on the +Program (independent of having been made by running the Program). +Whether that is true depends on what the Program does. + + 1. You may copy and distribute verbatim copies of the Program's +source code as you receive it, in any medium, provided that you +conspicuously and appropriately publish on each copy an appropriate +copyright notice and disclaimer of warranty; keep intact all the +notices that refer to this License and to the absence of any warranty; +and give any other recipients of the Program a copy of this License +along with the Program. + +You may charge a fee for the physical act of transferring a copy, and +you may at your option offer warranty protection in exchange for a fee. + + 2. You may modify your copy or copies of the Program or any portion +of it, thus forming a work based on the Program, and copy and +distribute such modifications or work under the terms of Section 1 +above, provided that you also meet all of these conditions: + + a) You must cause the modified files to carry prominent notices + stating that you changed the files and the date of any change. + + b) You must cause any work that you distribute or publish, that in + whole or in part contains or is derived from the Program or any + part thereof, to be licensed as a whole at no charge to all third + parties under the terms of this License. + + c) If the modified program normally reads commands interactively + when run, you must cause it, when started running for such + interactive use in the most ordinary way, to print or display an + announcement including an appropriate copyright notice and a + notice that there is no warranty (or else, saying that you provide + a warranty) and that users may redistribute the program under + these conditions, and telling the user how to view a copy of this + License. (Exception: if the Program itself is interactive but + does not normally print such an announcement, your work based on + the Program is not required to print an announcement.) + +These requirements apply to the modified work as a whole. If +identifiable sections of that work are not derived from the Program, +and can be reasonably considered independent and separate works in +themselves, then this License, and its terms, do not apply to those +sections when you distribute them as separate works. But when you +distribute the same sections as part of a whole which is a work based +on the Program, the distribution of the whole must be on the terms of +this License, whose permissions for other licensees extend to the +entire whole, and thus to each and every part regardless of who wrote it. + +Thus, it is not the intent of this section to claim rights or contest +your rights to work written entirely by you; rather, the intent is to +exercise the right to control the distribution of derivative or +collective works based on the Program. + +In addition, mere aggregation of another work not based on the Program +with the Program (or with a work based on the Program) on a volume of +a storage or distribution medium does not bring the other work under +the scope of this License. + + 3. You may copy and distribute the Program (or a work based on it, +under Section 2) in object code or executable form under the terms of +Sections 1 and 2 above provided that you also do one of the following: + + a) Accompany it with the complete corresponding machine-readable + source code, which must be distributed under the terms of Sections + 1 and 2 above on a medium customarily used for software interchange; or, + + b) Accompany it with a written offer, valid for at least three + years, to give any third party, for a charge no more than your + cost of physically performing source distribution, a complete + machine-readable copy of the corresponding source code, to be + distributed under the terms of Sections 1 and 2 above on a medium + customarily used for software interchange; or, + + c) Accompany it with the information you received as to the offer + to distribute corresponding source code. (This alternative is + allowed only for noncommercial distribution and only if you + received the program in object code or executable form with such + an offer, in accord with Subsection b above.) + +The source code for a work means the preferred form of the work for +making modifications to it. For an executable work, complete source +code means all the source code for all modules it contains, plus any +associated interface definition files, plus the scripts used to +control compilation and installation of the executable. However, as a +special exception, the source code distributed need not include +anything that is normally distributed (in either source or binary +form) with the major components (compiler, kernel, and so on) of the +operating system on which the executable runs, unless that component +itself accompanies the executable. + +If distribution of executable or object code is made by offering +access to copy from a designated place, then offering equivalent +access to copy the source code from the same place counts as +distribution of the source code, even though third parties are not +compelled to copy the source along with the object code. + + 4. You may not copy, modify, sublicense, or distribute the Program +except as expressly provided under this License. Any attempt +otherwise to copy, modify, sublicense or distribute the Program is +void, and will automatically terminate your rights under this License. +However, parties who have received copies, or rights, from you under +this License will not have their licenses terminated so long as such +parties remain in full compliance. + + 5. You are not required to accept this License, since you have not +signed it. However, nothing else grants you permission to modify or +distribute the Program or its derivative works. These actions are +prohibited by law if you do not accept this License. Therefore, by +modifying or distributing the Program (or any work based on the +Program), you indicate your acceptance of this License to do so, and +all its terms and conditions for copying, distributing or modifying +the Program or works based on it. + + 6. Each time you redistribute the Program (or any work based on the +Program), the recipient automatically receives a license from the +original licensor to copy, distribute or modify the Program subject to +these terms and conditions. You may not impose any further +restrictions on the recipients' exercise of the rights granted herein. +You are not responsible for enforcing compliance by third parties to +this License. + + 7. If, as a consequence of a court judgment or allegation of patent +infringement or for any other reason (not limited to patent issues), +conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot +distribute so as to satisfy simultaneously your obligations under this +License and any other pertinent obligations, then as a consequence you +may not distribute the Program at all. For example, if a patent +license would not permit royalty-free redistribution of the Program by +all those who receive copies directly or indirectly through you, then +the only way you could satisfy both it and this License would be to +refrain entirely from distribution of the Program. + +If any portion of this section is held invalid or unenforceable under +any particular circumstance, the balance of the section is intended to +apply and the section as a whole is intended to apply in other +circumstances. + +It is not the purpose of this section to induce you to infringe any +patents or other property right claims or to contest validity of any +such claims; this section has the sole purpose of protecting the +integrity of the free software distribution system, which is +implemented by public license practices. Many people have made +generous contributions to the wide range of software distributed +through that system in reliance on consistent application of that +system; it is up to the author/donor to decide if he or she is willing +to distribute software through any other system and a licensee cannot +impose that choice. + +This section is intended to make thoroughly clear what is believed to +be a consequence of the rest of this License. + + 8. If the distribution and/or use of the Program is restricted in +certain countries either by patents or by copyrighted interfaces, the +original copyright holder who places the Program under this License +may add an explicit geographical distribution limitation excluding +those countries, so that distribution is permitted only in or among +countries not thus excluded. In such case, this License incorporates +the limitation as if written in the body of this License. + + 9. The Free Software Foundation may publish revised and/or new versions +of the General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies a version number of this License which applies to it and "any +later version", you have the option of following the terms and conditions +either of that version or of any later version published by the Free +Software Foundation. If the Program does not specify a version number of +this License, you may choose any version ever published by the Free Software +Foundation. + + 10. If you wish to incorporate parts of the Program into other free +programs whose distribution conditions are different, write to the author +to ask for permission. For software which is copyrighted by the Free +Software Foundation, write to the Free Software Foundation; we sometimes +make exceptions for this. Our decision will be guided by the two goals +of preserving the free status of all derivatives of our free software and +of promoting the sharing and reuse of software generally. + + NO WARRANTY + + 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY +FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN +OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES +PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED +OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS +TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE +PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, +REPAIR OR CORRECTION. + + 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + 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., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/dist/tools/ethos/Makefile b/dist/tools/ethos/Makefile new file mode 100644 index 0000000000..804f4aa4cc --- /dev/null +++ b/dist/tools/ethos/Makefile @@ -0,0 +1,4 @@ +all: ethos + +ethos: ethos.c + $(CC) -O3 -Wall ethos.c -o ethos diff --git a/dist/tools/ethos/README.md b/dist/tools/ethos/README.md new file mode 100644 index 0000000000..2131251dae --- /dev/null +++ b/dist/tools/ethos/README.md @@ -0,0 +1,15 @@ +## Requirements + +- currently, the host side only compiles on Linux + +## Usage + +To use, add + + # + GNRC_NETIF_NUMOF := 2 + USEMODULE += ethos gnrc_netdev2 + CFLAGS += '-DETHOS_UART=UART_DEV(0)' -DETHOS_BAUDRATE=115200 -DUSE_ETHOS_FOR_STDIO + +to app Makefile, "make clean all flash", then run this tool so follows: + # sudo ./ethos diff --git a/dist/tools/ethos/ethos.c b/dist/tools/ethos/ethos.c new file mode 100644 index 0000000000..ef10b9981e --- /dev/null +++ b/dist/tools/ethos/ethos.c @@ -0,0 +1,379 @@ +/* + * Copyright (C) 2016 Kaspar Schleiser + * + * This file is subject to the terms and conditions of the GNU General Public + * License v2. See the file LICENSE for more details. + */ + +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define MTU 9000 + +#define TRACE(x) + +static void usage(void) +{ + fprintf(stderr, "usage: eth_over_serial \n"); +} + +int set_serial_attribs (int fd, int speed, int parity) +{ + struct termios tty; + memset (&tty, 0, sizeof tty); + if (tcgetattr (fd, &tty) != 0) + { + perror ("error in tcgetattr"); + return -1; + } + + cfsetospeed (&tty, speed); + cfsetispeed (&tty, speed); + + tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8; /* 8-bit chars*/ + /* disable IGNBRK for mismatched speed + * tests; otherwise receive break*/ + /* as \000 chars*/ + tty.c_iflag &= ~IGNBRK; /* disable break processing*/ + tty.c_lflag = 0; /* no signaling chars, no echo,*/ + /* no canonical processing*/ + tty.c_oflag = 0; /* no remapping, no delays*/ + tty.c_cc[VMIN] = 0; /* read doesn't block*/ + tty.c_cc[VTIME] = 5; /* 0.5 seconds read timeout*/ + + tty.c_iflag &= ~(IXON | IXOFF | IXANY); /* shut off xon/xoff ctrl*/ + + tty.c_cflag |= (CLOCAL | CREAD); /* ignore modem controls,*/ + /* enable reading*/ + tty.c_cflag &= ~(PARENB | PARODD); /* shut off parity*/ + tty.c_cflag |= parity; + tty.c_cflag &= ~CSTOPB; + tty.c_cflag &= ~CRTSCTS; + cfmakeraw(&tty); + + if (tcsetattr (fd, TCSANOW, &tty) != 0) + { + perror("error from tcsetattr"); + return -1; + } + return 0; +} + +void set_blocking (int fd, int should_block) +{ + struct termios tty; + memset (&tty, 0, sizeof tty); + if (tcgetattr (fd, &tty) != 0) + { + perror("error from tggetattr"); + return; + } + + tty.c_cc[VMIN] = should_block ? 1 : 0; + tty.c_cc[VTIME] = 5; /* 0.5 seconds read timeout*/ + + if (tcsetattr (fd, TCSANOW, &tty) != 0) + perror("error setting term attributes"); +} + +/** + * @brief Escape char definitions + * @{ + */ +#define LINE_FRAME_DELIMITER (0x7E) +#define LINE_ESC_CHAR (0x7D) +#define LINE_FRAME_TYPE_DATA (0x00) +#define LINE_FRAME_TYPE_TEXT (0x01) +#define LINE_FRAME_TYPE_HELLO (0x02) +#define LINE_FRAME_TYPE_HELLO_REPLY (0x03) +/** @} */ + +typedef enum { + WAIT_FRAMESTART, + IN_FRAME, + IN_ESCAPE +} line_state_t; + +typedef struct { + line_state_t state; + int frametype; + size_t framebytes; + char frame[MTU]; + char local_l2_addr[6]; + char remote_l2_addr[6]; +} serial_t; + +/************************************************************************** + * tun_alloc: allocates or reconnects to a tun/tap device. The caller * + * needs to reserve enough space in *dev. * + **************************************************************************/ +int tun_alloc(char *dev, int flags) { + + struct ifreq ifr; + int fd, err; + + if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) { + perror("Opening /dev/net/tun"); + return fd; + } + + memset(&ifr, 0, sizeof(ifr)); + + ifr.ifr_flags = flags; + + if (*dev) { + strncpy(ifr.ifr_name, dev, IFNAMSIZ); + } + + if( (err = ioctl(fd, TUNSETIFF, (void *)&ifr)) < 0 ) { + perror("ioctl(TUNSETIFF)"); + close(fd); + return err; + } + + strcpy(dev, ifr.ifr_name); + + return fd; +} + +static void _handle_char(serial_t *serial, char c) +{ + serial->frame[serial->framebytes] = c; + serial->framebytes++; +} + +static int _serial_handle_byte(serial_t *serial, char c) +{ + switch (serial->state) { + case WAIT_FRAMESTART: + if (c == LINE_FRAME_DELIMITER) { + TRACE("frame start"); + serial->state = IN_FRAME; + serial->frametype = 0; + serial->framebytes = 0; + } + break; + case IN_FRAME: + if (c == LINE_ESC_CHAR) { + TRACE("i esc"); + serial->state = IN_ESCAPE; + } + else if (c == LINE_FRAME_DELIMITER) { + if (!serial->framebytes) { + TRACE("i del unexp"); + } else { + TRACE("i del"); + serial->state = WAIT_FRAMESTART; + return serial->framebytes; + } + } + else { + _handle_char(serial, c); + } + break; + case IN_ESCAPE: + if (c == (LINE_FRAME_DELIMITER ^ 0x20)) { + _handle_char(serial, LINE_FRAME_DELIMITER); + } + else if (c == (LINE_ESC_CHAR ^ 0x20)) { + _handle_char(serial, LINE_ESC_CHAR); + } + else if (c == (LINE_FRAME_TYPE_TEXT ^ 0x20)) { + TRACE("esc txt"); + serial->frametype = LINE_FRAME_TYPE_TEXT; + } + else if (c == (LINE_FRAME_TYPE_HELLO ^ 0x20)) { + TRACE("esc hello"); + serial->frametype = LINE_FRAME_TYPE_HELLO; + } + else if (c == (LINE_FRAME_TYPE_HELLO_REPLY ^ 0x20)) { + TRACE("esc hello_reply"); + serial->frametype = LINE_FRAME_TYPE_HELLO_REPLY; + } + else if (c == LINE_FRAME_DELIMITER) { + TRACE("esc -del"); + } + serial->state = IN_FRAME; + break; + } + + return 0; +} + +static void _write_escaped(int fd, char* buf, ssize_t n) +{ + uint8_t out[2]; + size_t escaped = 0; + + while(n--) { + char c = *buf++; + switch(c) { + case LINE_FRAME_DELIMITER: + out[0] = LINE_ESC_CHAR; + out[1] = (LINE_FRAME_DELIMITER ^ 0x20); + write(fd, out, 2); + escaped++; + break; + case LINE_ESC_CHAR: + out[0] = LINE_ESC_CHAR; + out[1] = (LINE_ESC_CHAR ^ 0x20); + write(fd, out, 2); + escaped++; + break; + default: + write(fd, &c, 1); + } + } +} + +static void _send_hello(int serial_fd, serial_t *serial, unsigned type) +{ + char delim = LINE_FRAME_DELIMITER; + char head[] = { LINE_FRAME_DELIMITER, LINE_ESC_CHAR, (type ^ 0x20) }; + write(serial_fd, head, sizeof(head)); + write(serial_fd, serial->local_l2_addr, 6); + write(serial_fd, &delim, 1); +} + +static void _clear_neighbor_cache(const char *ifname) +{ + char tmp[20 + IFNAMSIZ]; + snprintf(tmp, sizeof(tmp), "ip neigh flush dev %s", ifname); + system(tmp); +} + +int main(int argc, char *argv[]) +{ + char inbuf[MTU]; + + serial_t serial = {0}; + + if (argc < 3) { + usage(); + return 1; + } + + char ifname[IFNAMSIZ]; + strncpy(ifname, argv[1], IFNAMSIZ); + int tap_fd = tun_alloc(ifname, IFF_TAP | IFF_NO_PI); + + if (tap_fd < 0) { + return 1; + } + + int serial_fd = open(argv[2], O_RDWR | O_NOCTTY | O_SYNC); + + if (serial_fd < 0) { + fprintf(stderr, "Error opening serial device %s\n", argv[2]); + return 1; + } + + set_serial_attribs(serial_fd, B115200, 0); + set_blocking(serial_fd, 1); + + fd_set readfds; + int max_fd = (serial_fd > tap_fd) ? serial_fd : tap_fd; + + fprintf(stderr, "----> ethos: sending hello.\n"); + _send_hello(serial_fd, &serial, LINE_FRAME_TYPE_HELLO); + + fprintf(stderr, "----> ethos: activating serial pass through.\n"); + _send_hello(serial_fd, &serial, LINE_FRAME_TYPE_HELLO); + while(1) { + int activity; + FD_ZERO(&readfds); + FD_SET(STDIN_FILENO, &readfds); + FD_SET(tap_fd, &readfds); + FD_SET(serial_fd, &readfds); + activity = select( max_fd + 1 , &readfds , NULL , NULL , NULL); + + if ((activity < 0) && (errno != EINTR)) + { + perror("select error"); + } + + if (FD_ISSET(serial_fd, &readfds)) { + ssize_t n = read(serial_fd, inbuf, sizeof(inbuf)); + if (n > 0) { + char *ptr = inbuf; + while (n--) { + size_t res = _serial_handle_byte(&serial, *ptr++); + if (res) { + switch (serial.frametype) { + case LINE_FRAME_TYPE_DATA: + write(tap_fd, serial.frame, serial.framebytes); + break; + case LINE_FRAME_TYPE_TEXT: + write(STDOUT_FILENO, serial.frame, serial.framebytes); + break; + case LINE_FRAME_TYPE_HELLO: + case LINE_FRAME_TYPE_HELLO_REPLY: + if (serial.framebytes == 6) { + memcpy(serial.remote_l2_addr, serial.frame, 6); + if (serial.frametype == LINE_FRAME_TYPE_HELLO) { + fprintf(stderr, "----> ethos: hello received\n"); + _send_hello(serial_fd, &serial, LINE_FRAME_TYPE_HELLO_REPLY); + } else { + fprintf(stderr, "----> ethos: hello reply received\n"); + } + _clear_neighbor_cache(ifname); + } + break; + } + memset(&serial, '\0', sizeof(serial)); + } + } + } + else { + fprintf(stderr, "lost serial connection.\n"); + exit(1); + } + } + + if (FD_ISSET(tap_fd, &readfds)) { + ssize_t res = read(tap_fd, inbuf, sizeof(inbuf)); + if (res <= 0) { + fprintf(stderr, "error reading from tap device. res=%zi\n", res); + continue; + } + char delim = LINE_FRAME_DELIMITER; + write(serial_fd, &delim, 1); + _write_escaped(serial_fd, inbuf, res); + write(serial_fd, &delim, 1); + } + + if (FD_ISSET(STDIN_FILENO, &readfds)) { + ssize_t res = read(STDIN_FILENO, inbuf, sizeof(inbuf)); + if (res <= 0) { + fprintf(stderr, "error reading from stdio. res=%zi\n", res); + continue; + } + + if (res) { + char delim = LINE_FRAME_DELIMITER; + char head[] = { LINE_FRAME_DELIMITER, LINE_ESC_CHAR, (LINE_FRAME_TYPE_TEXT ^ 0x20) }; + write(serial_fd, head, sizeof(head)); + _write_escaped(serial_fd, inbuf, res); + write(serial_fd, &delim, 1); + } + } + } + + return 0; +}