I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
223 lines
5.4 KiB
C
223 lines
5.4 KiB
C
/*
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* Copyright (c) 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sf.c
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* Transmit and receive frames over serial connections.
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*/
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static bool try_read(int fd, const char* fd_path, unsigned char* c)
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{
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ssize_t amount = read(fd, c, 1);
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if ( amount < 0 )
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err(1, "read: %s", fd_path);
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return amount == 1;
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}
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static void try_write(int fd, const char* fd_path, unsigned char c)
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{
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ssize_t amount = write(fd, &c, 1);
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if ( amount < 0 )
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err(1, "write: %s", fd_path);
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if ( amount == 0 )
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errx(1, "write: %s: End of file condition", fd_path);
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}
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static void receive(int fd, const char* fd_path)
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{
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unsigned char c;
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while ( true )
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{
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if ( !try_read(fd, fd_path, &c) )
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return;
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if ( c != 0xF7 )
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continue;
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if ( !try_read(fd, fd_path, &c) )
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return;
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if ( c == 0xFF )
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break;
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}
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while ( true )
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{
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if ( !try_read(fd, fd_path, &c) )
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return;
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if ( c == 0xF7 )
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{
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if ( !try_read(fd, fd_path, &c) )
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return;
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if ( c == 0xFE )
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break;
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if ( c == 0xFD )
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try_write(1, "stdout", 0xF7);
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continue;
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}
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try_write(1, "stdout", c);
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}
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}
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static void transmit(int fd, const char* fd_path)
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{
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try_write(fd, fd_path, 0xF7);
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try_write(fd, fd_path, 0xFF);
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unsigned char c;
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while ( try_read(0, "stdin", &c) )
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{
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if ( c == 0xF7 )
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{
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try_write(fd, fd_path, 0xF7);
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try_write(fd, fd_path, 0xFD);
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continue;
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}
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try_write(fd, fd_path, c);
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}
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try_write(fd, fd_path, 0xF7);
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try_write(fd, fd_path, 0xFE);
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}
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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static void help(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION...] [DEVICE]\n", argv0);
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fprintf(fp, "Transmit and receive frames over serial connections.\n");
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fprintf(fp, "\n");
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fprintf(fp, "Mandatory arguments to long options are mandatory for short options too.\n");
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fprintf(fp, " -i, --input receive a frame\n");
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fprintf(fp, " -t, --output transmit a frame\n");
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fprintf(fp, " --help display this help and exit\n");
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fprintf(fp, " --version output version information and exit\n");
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}
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static void version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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}
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int main(int argc, char* argv[])
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{
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setlocale(LC_ALL, "");
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bool flag_input = false;
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bool flag_output = false;
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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case 'i': flag_input = true; break;
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case 'o': flag_output = true; break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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help(stderr, argv0);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--help") )
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help(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--version") )
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version(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--input") )
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flag_input = true;
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else if ( !strcmp(arg, "--output") )
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flag_output = true;
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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help(stderr, argv0);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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if ( flag_input + flag_output == 0 )
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errx(1, "need to specify exactly one of the -io options");
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if ( flag_input + flag_output > 1 )
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errx(1, "specified multiple of the incompatible -io options");
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if ( 3 <= argc )
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errx(1, "extra operand `%s'", argv[2]);
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int fd = flag_input ? 0 : 1;
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const char* fd_path = flag_input ? "stdin" : "stdout";
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if ( 2 <= argc )
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{
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fd_path = argv[1];
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struct stat st;
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if ( stat(fd_path, &st) == 0 && S_ISSOCK(st.st_mode) )
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{
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if ( (fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0 )
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err(1, "socket");
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struct sockaddr_un* addr;
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size_t addr_size = sizeof(*addr) - sizeof(addr->sun_path) +
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strlen(fd_path) + 1;
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if ( addr_size < sizeof(*addr) )
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addr_size = sizeof(*addr);
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if ( !(addr = (struct sockaddr_un*) malloc(addr_size)) )
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err(1, "malloc");
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memset(addr, 0, addr_size);
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addr->sun_family = AF_UNIX;
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strcpy(addr->sun_path, fd_path);
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if ( connect(fd, (const struct sockaddr*) addr, addr_size) < 0 )
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err(1, "connect: %s", fd_path);
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}
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else if ( (fd = open(fd_path, flag_input ? O_RDONLY : O_WRONLY)) < 0 )
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err(1, "%s", fd_path);
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}
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(flag_input ? receive : transmit)(fd, fd_path);
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if ( fd != 0 && fd != 1 )
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close(fd);
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return 0;
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}
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