diff options
| -rw-r--r-- | serialclient.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/serialclient.c b/serialclient.c new file mode 100644 index 0000000..1e5adb8 --- /dev/null +++ b/serialclient.c @@ -0,0 +1,255 @@ +/* + * rhctl + * + * Copyright (C) 2009 Christian Pointner <equinox@spreadspace.org> + * + * This file is part of rhctl. + * + * rhctl 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 3 of the License, or + * any later version. + * + * rhctl 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 rhctl. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "datatypes.h" + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> + +#include "log.h" +#include "sig_handler.h" +#include "options.h" + +#include "daemon.h" +#include "utils.h" + +int process_data(int src_fd, int dest_fd) +{ + char* buffer[100]; + int ret = read(src_fd, buffer, 100); + if(!ret) + return 2; + if(ret == -1 && errno == EAGAIN) + return 0; + if(ret < 0) + return ret; + + int len = ret; + int offset = 0; + for(;;) { + ret = write(dest_fd, &buffer[offset], len - offset); + if(ret < 0) { + if(errno != EINTR) + return ret; + + ret = 0; + } + + offset += ret; + if(offset+1 >= len) + break; + } + return ret; +} + +int main_loop(int serial_fd, int cmd_fd, options_t* opt) +{ + log_printf(NOTICE, "entering main loop"); + + fd_set readfds, tmpfds; + FD_ZERO(&readfds); + FD_SET(serial_fd, &readfds); + FD_SET(cmd_fd, &readfds); + int max_fd = serial_fd > cmd_fd ? serial_fd : cmd_fd; + + int sig_fd = signal_init(); + if(sig_fd < 0) + return -1; + FD_SET(sig_fd, &readfds); + max_fd = (max_fd < sig_fd) ? sig_fd : max_fd; + + int return_value = 0; + + return_value = send_string(cmd_fd, opt->type); + + while(!return_value) { + memcpy(&tmpfds, &readfds, sizeof(tmpfds)); + + int ret = select(max_fd+1, &tmpfds, NULL, NULL, NULL); + if(ret == -1 && errno != EINTR) { + log_printf(ERROR, "select returned with error: %s", strerror(errno)); + return_value = -1; + break; + } + if(ret == -1 || !ret) + continue; + + if(FD_ISSET(sig_fd, &tmpfds)) { + if(signal_handle()) { + return_value = 1; + break; + } + } + + if(FD_ISSET(serial_fd, &tmpfds)) { + return_value = process_data(serial_fd, cmd_fd); + if(return_value) + break; + } + + if(FD_ISSET(cmd_fd, &tmpfds)) { + return_value = process_data(cmd_fd, serial_fd); + } + } + + signal_stop(); + return return_value; +} + +int main(int argc, char* argv[]) +{ + log_init(); + + options_t opt; + int ret = options_parse(&opt, argc, argv); + if(ret) { + if(ret > 0) { + fprintf(stderr, "syntax error near: %s\n\n", argv[ret]); + } + if(ret == -2) { + fprintf(stderr, "memory error on options_parse, exiting\n"); + } + + if(ret != -2) + options_print_usage(); + + options_clear(&opt); + log_close(); + exit(ret); + } + string_list_element_t* tmp = opt.log_targets_.first_; + if(!tmp) { + log_add_target("syslog:3,serialclient,daemon"); + } + else { + while(tmp) { + ret = log_add_target(tmp->string_); + if(ret) { + switch(ret) { + case -2: fprintf(stderr, "memory error on log_add_target, exitting\n"); break; + case -3: fprintf(stderr, "unknown log target: '%s', exitting\n", tmp->string_); break; + case -4: fprintf(stderr, "this log target is only allowed once: '%s', exitting\n", tmp->string_); break; + default: fprintf(stderr, "syntax error near: '%s', exitting\n", tmp->string_); break; + } + + options_clear(&opt); + log_close(); + exit(ret); + } + tmp = tmp->next_; + } + } + log_printf(NOTICE, "just started..."); + if(options_parse_post(&opt)) { + options_clear(&opt); + log_close(); + exit(-1); + } + + priv_info_t priv; + if(opt.username_) + if(priv_init(&priv, opt.username_, opt.groupname_)) { + options_clear(&opt); + log_close(); + exit(-1); + } + + FILE* pid_file = NULL; + if(opt.pid_file_) { + pid_file = fopen(opt.pid_file_, "w"); + if(!pid_file) { + log_printf(WARNING, "unable to open pid file: %s", strerror(errno)); + } + } + + if(opt.chroot_dir_) + if(do_chroot(opt.chroot_dir_)) { + options_clear(&opt); + log_close(); + exit(-1); + } + if(opt.username_) + if(priv_drop(&priv)) { + options_clear(&opt); + log_close(); + exit(-1); + } + + if(opt.daemonize_) { + pid_t oldpid = getpid(); + daemonize(); + log_printf(INFO, "running in background now (old pid: %d)", oldpid); + } + + if(pid_file) { + pid_t pid = getpid(); + fprintf(pid_file, "%d", pid); + fclose(pid_file); + } + + int cmd_fd = init_command_socket(opt.command_sock_); + if(cmd_fd < 0) { + options_clear(&opt); + log_close(); + exit(-1); + } + + int serial_fd = 0; + for(;;) { + serial_fd = open(opt.serial_dev_, O_RDWR | O_NOCTTY); + if(serial_fd < 0) + ret = 2; + else { + ret = setup_tty(serial_fd, B38400); + if(ret) + ret = 2; + else + ret = main_loop(serial_fd, cmd_listen_fd, &opt); + } + + if(ret == 2) { + log_printf(ERROR, "%s error, trying to reopen in 5 seconds..", opt.serial_dev_); + if(serial_fd > 0) + close(serial_fd); + sleep(5); + } + else + break; + } + + close(cmd_listen_fd); + if(serial_fd > 0) + close(serial_fd); + + if(!ret) + log_printf(NOTICE, "normal shutdown"); + else if(ret < 0) + log_printf(NOTICE, "shutdown after error"); + else + log_printf(NOTICE, "shutdown after signal"); + + options_clear(&opt); + log_close(); + + return ret; +} |