--- /dev/null
+/*
+ * powersensordaemon
+ *
+ * Copyright (C) 2009 Christian Pointner <equinox@spreadspace.org>
+ *
+ * This file is part of powersensordaemon.
+ *
+ * powersensordaemon 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.
+ *
+ * powersensordaemon 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 powersensordaemon. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "datatypes.h"
+
+#include <termios.h>
+#include <unistd.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <sys/un.h>
+
+#include "log.h"
+#include "sig_handler.h"
+#include "options.h"
+
+#include "command_queue.h"
+#include "client_list.h"
+
+#include "daemon.h"
+
+int init_command_socket(const char* path)
+{
+ int fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if(fd < 0) {
+ log_printf(ERROR, "unable to open socket: %s", strerror(errno));
+ return -1;
+ }
+
+ struct sockaddr_un local;
+ local.sun_family = AF_UNIX;
+ if(sizeof(local.sun_path) <= strlen(path)) {
+ log_printf(ERROR, "socket path is to long (max %d)", sizeof(local.sun_path)-1);
+ return -1;
+ }
+ strcpy(local.sun_path, path);
+ unlink(local.sun_path);
+ int len = SUN_LEN(&local);
+ int ret = bind(fd, (struct sockaddr*)&local, len);
+ if(ret) {
+ log_printf(ERROR, "unable to bind to '%s': %s", local.sun_path, strerror(errno));
+ return -1;
+ }
+
+ ret = listen(fd, 4);
+ if(ret) {
+ log_printf(ERROR, "unable to listen on command socket: %s", local.sun_path, strerror(errno));
+ return -1;
+ }
+
+ log_printf(INFO, "now listening on %s for incoming commands", path);
+
+ return fd;
+}
+
+int send_command(int tty_fd, cmd_t* cmd)
+{
+ if(!cmd)
+ return -1;
+
+ char c;
+ switch(cmd->cmd) {
+ case POWER: {
+ c = 'A'; // get command from powerids[cmd->param]
+ break;
+ }
+ case SAMPLE: {
+ c = 'T'; // get command from sampledevs[cmd->param]
+ break;
+ }
+ default: return 0;
+ }
+
+ int ret;
+ do {
+ ret = write(tty_fd, &c, 1);
+ } while(!ret || (ret == -1 && errno == EINTR));
+
+ if(ret > 0) {
+ cmd_sent(cmd);
+ return 0;
+ }
+
+ return ret;
+}
+
+int send_response(int fd, const char* response)
+{
+ if(!response)
+ return -1;
+
+ int len = strlen(response);
+ int offset = 0;
+ int ret;
+ for(;;) {
+ ret = write(fd, &response[offset], len - offset);
+ if(ret < 0) {
+ if(errno != EINTR)
+ return ret;
+
+ ret = 0;
+ }
+
+ offset += ret;
+ if(offset+1 >= len)
+ break;
+ }
+ do {
+ ret = write(fd, "\n", 1);
+ } while(!ret || (ret == -1 && errno == EINTR));
+
+ if(ret > 0)
+ return 0;
+
+ return ret;
+}
+
+int process_cmd(const char* cmd, int fd, cmd_t **cmd_q, client_t* client_lst)
+{
+ log_printf(DEBUG, "processing command from %d", fd);
+
+ if(!cmd_q || !cmd)
+ return -1;
+
+ cmd_id_t cmd_id;
+ if(!strncmp(cmd, "power", 5))
+ cmd_id = POWER;
+ else if(!strncmp(cmd, "sample", 6))
+ cmd_id = SAMPLE;
+ else if(!strncmp(cmd, "log", 3))
+ cmd_id = LOG;
+ else if(!strncmp(cmd, "listen", 6)) {
+ cmd_id = LISTEN;
+ }
+ else {
+ log_printf(WARNING, "unknown command '%s'", cmd);
+ return 0;
+ }
+ char* param = strchr(cmd, ' ');
+ if(param)
+ param++;
+
+ if(cmd_id == POWER || cmd_id == SAMPLE) {
+ char* resp;
+ asprintf(&resp, "Request: %s", cmd);
+ if(resp) {
+ char* linefeed = strchr(resp, '\n');
+ if(linefeed) linefeed[0] = 0;
+ client_t* client;
+ int listener_cnt = 0;
+ for(client = client_lst; client; client = client->next)
+ if(client->request_listener && client->fd != fd) {
+ send_response(client->fd, resp);
+ listener_cnt++;
+ }
+ free(resp);
+ log_printf(DEBUG, "sent request to %d additional listeners", listener_cnt);
+ }
+// else silently ignore memory alloc error
+ }
+
+ switch(cmd_id) {
+ case POWER:
+ case SAMPLE: {
+ int ret = cmd_push(cmd_q, fd, cmd_id, param);
+ if(ret)
+ return ret;
+
+ log_printf(NOTICE, "command: %s", cmd);
+ break;
+ }
+ case LOG: {
+ if(param && param[0])
+ log_printf(NOTICE, "ext msg: %s", param);
+ else
+ log_printf(DEBUG, "ignoring empty ext log message");
+ break;
+ }
+ case LISTEN: {
+ client_t* listener = client_find(client_lst, fd);
+ if(listener) {
+ if(!param || !strncmp(param, "all", 3)) {
+ listener->request_listener = 1;
+ listener->error_listener = 1;
+ listener->temp_listener = 1;
+ listener->photo_listener = 1;
+ listener->movement_listener = 1;
+ listener->button_listener = 1;
+ }
+ else if(!strncmp(param, "none", 4)) {
+ listener->request_listener = 0;
+ listener->error_listener = 0;
+ listener->temp_listener = 0;
+ listener->photo_listener = 0;
+ listener->movement_listener = 0;
+ listener->button_listener = 0;
+ }
+ else if(!strncmp(param, "request", 7))
+ listener->request_listener = 1;
+ else if(!strncmp(param, "error", 5))
+ listener->error_listener = 1;
+ else if(!strncmp(param, "temp", 4))
+ listener->temp_listener = 1;
+ else if(!strncmp(param, "photo", 5))
+ listener->photo_listener = 1;
+ else if(!strncmp(param, "movement", 8))
+ listener->movement_listener = 1;
+ else if(!strncmp(param, "button", 6))
+ listener->button_listener = 1;
+ else {
+ log_printf(DEBUG, "unkown listener type '%s'", param);
+ break;
+ }
+ log_printf(DEBUG, "listener %d requests %s messages", fd, param ? param:"all");
+ }
+ else {
+ log_printf(ERROR, "unable to add listener %d", fd);
+ }
+ break;
+ }
+ }
+
+ return 0;
+}
+
+int nonblock_recvline(read_buffer_t* buffer, int fd, cmd_t** cmd_q, client_t* client_lst)
+{
+ int ret = 0;
+ for(;;) {
+ ret = recv(fd, &buffer->buf[buffer->offset], 1, 0);
+ if(!ret)
+ return 2;
+ if(ret == -1 && errno == EAGAIN)
+ return 0;
+ else if(ret < 0)
+ break;
+
+ if(buffer->buf[buffer->offset] == '\n') {
+ buffer->buf[buffer->offset] = 0;
+ ret = process_cmd(buffer->buf, fd, cmd_q, client_lst);
+ buffer->offset = 0;
+ break;
+ }
+
+ buffer->offset++;
+ if(buffer->offset >= sizeof(buffer->buf)) {
+ log_printf(DEBUG, "string too long (fd=%d)", fd);
+ buffer->offset = 0;
+ return 0;
+ }
+ }
+
+ return ret;
+}
+
+int process_tty(read_buffer_t* buffer, int tty_fd, cmd_t **cmd_q, client_t* client_lst)
+{
+ int ret = 0;
+ struct timeval tv;
+ fd_set fds;
+ FD_ZERO(&fds);
+ FD_SET(tty_fd, &fds);
+
+ for(;;) {
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ ret = select(tty_fd+1, &fds, NULL, NULL, &tv);
+ if(!ret)
+ return 0;
+ else if(ret < 0)
+ return ret;
+
+ ret = read(tty_fd, &buffer->buf[buffer->offset], 1);
+ if(!ret)
+ return 2;
+ if(ret == -1 && errno == EAGAIN)
+ return 0;
+ else if(ret < 0)
+ break;
+
+ if(buffer->buf[buffer->offset] == '\n') {
+ buffer->buf[buffer->offset] = 0;
+
+ if(buffer->offset > 0 && buffer->buf[buffer->offset-1] == '\r')
+ buffer->buf[buffer->offset-1] = 0;
+
+ log_printf(NOTICE, "tty-firmware: %s", buffer->buf);
+
+ int cmd_fd = -1;
+ if(cmd_q && (*cmd_q)) {
+ cmd_fd = (*cmd_q)->fd;
+ send_response(cmd_fd, buffer->buf);
+ }
+
+ if(!strncmp(buffer->buf, "Error:", 6)) {
+ client_t* client;
+ int listener_cnt = 0;
+ for(client = client_lst; client; client = client->next)
+ if(client->error_listener && client->fd != cmd_fd) {
+ send_response(client->fd, buffer->buf);
+ listener_cnt++;
+ }
+ log_printf(DEBUG, "sent error to %d additional listeners", listener_cnt);
+ }
+
+ cmd_pop(cmd_q);
+ buffer->offset = 0;
+ return 0;
+ }
+
+ buffer->offset++;
+ if(buffer->offset >= sizeof(buffer->buf)) {
+ log_printf(DEBUG, "string too long (fd=%d)", tty_fd);
+ buffer->offset = 0;
+ return 0;
+ }
+ }
+
+ return ret;
+}
+
+int main_loop(int tty_fd, int cmd_listen_fd)
+{
+ log_printf(NOTICE, "entering main loop");
+
+ fd_set readfds, tmpfds;
+ FD_ZERO(&readfds);
+ FD_SET(tty_fd, &readfds);
+ FD_SET(cmd_listen_fd, &readfds);
+ int max_fd = tty_fd > cmd_listen_fd ? tty_fd : cmd_listen_fd;
+ cmd_t* cmd_q = NULL;
+ client_t* client_lst = NULL;
+
+ read_buffer_t tty_buffer;
+ tty_buffer.offset = 0;
+
+ 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;
+
+ struct timeval timeout;
+ int return_value = 0;
+ while(!return_value) {
+ memcpy(&tmpfds, &readfds, sizeof(tmpfds));
+
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 200000;
+ int ret = select(max_fd+1, &tmpfds, NULL, NULL, &timeout);
+ if(ret == -1 && errno != EINTR) {
+ log_printf(ERROR, "select returned with error: %s", strerror(errno));
+ return_value = -1;
+ break;
+ }
+ if(ret == -1)
+ continue;
+ if(!ret) {
+ if(cmd_q && cmd_has_expired(*cmd_q)) {
+ log_printf(ERROR, "last command expired");
+ cmd_pop(&cmd_q);
+ }
+ else
+ continue;
+ }
+
+ if(FD_ISSET(sig_fd, &tmpfds)) {
+ if(signal_handle()) {
+ return_value = 1;
+ break;
+ }
+ }
+
+ if(FD_ISSET(tty_fd, &tmpfds)) {
+ return_value = process_tty(&tty_buffer, tty_fd, &cmd_q, client_lst);
+ if(return_value)
+ break;
+ }
+
+ if(FD_ISSET(cmd_listen_fd, &tmpfds)) {
+ int new_fd = accept(cmd_listen_fd, NULL, NULL);
+ if(new_fd < 0) {
+ log_printf(ERROR, "accept returned with error: %s", strerror(errno));
+ return_value = -1;
+ break;
+ }
+ log_printf(DEBUG, "new command connection (fd=%d)", new_fd);
+ FD_SET(new_fd, &readfds);
+ max_fd = (max_fd < new_fd) ? new_fd : max_fd;
+ fcntl(new_fd, F_SETFL, O_NONBLOCK);
+ client_add(&client_lst, new_fd);
+ }
+
+ client_t* lst = client_lst;
+ while(lst) {
+ if(FD_ISSET(lst->fd, &tmpfds)) {
+ return_value = nonblock_recvline(&(lst->buffer), lst->fd, &cmd_q, client_lst);
+ if(return_value == 2) {
+ log_printf(DEBUG, "removing closed command connection (fd=%d)", lst->fd);
+ client_t* deletee = lst;
+ lst = lst->next;
+ FD_CLR(deletee->fd, &readfds);
+ client_remove(&client_lst, deletee->fd);
+ return_value = 0;
+ continue;
+ }
+ if(return_value)
+ break;
+
+ }
+ lst = lst->next;
+ }
+
+ if(cmd_q && !cmd_q->sent)
+ send_command(tty_fd, cmd_q);
+ }
+
+ cmd_clear(&cmd_q);
+ client_clear(&client_lst);
+ signal_stop();
+ return return_value;
+}
+
+int setup_tty(int fd)
+{
+ struct termios tmio;
+
+ int ret = tcgetattr(fd, &tmio);
+ if(ret) {
+ log_printf(ERROR, "Error on tcgetattr(): %s", strerror(errno));
+ return ret;
+ }
+
+ ret = cfsetospeed(&tmio, B9600);
+ if(ret) {
+ log_printf(ERROR, "Error on cfsetospeed(): %s", strerror(errno));
+ return ret;
+ }
+
+ ret = cfsetispeed(&tmio, B9600);
+ if(ret) {
+ log_printf(ERROR, "Error on cfsetispeed(): %s", strerror(errno));
+ return ret;
+ }
+
+ tmio.c_lflag &= ~ECHO;
+
+ ret = tcsetattr(fd, TCSANOW, &tmio);
+ if(ret) {
+ log_printf(ERROR, "Error on tcsetattr(): %s", strerror(errno));
+ return ret;
+ }
+
+ ret = tcflush(fd, TCIFLUSH);
+ if(ret) {
+ log_printf(ERROR, "Error on tcflush(): %s", strerror(errno));
+ return ret;
+ }
+
+ fd_set fds;
+ struct timeval tv;
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+ tv.tv_sec = 0;
+ tv.tv_usec = 50000;
+ for(;;) {
+ ret = select(fd+1, &fds, NULL, NULL, &tv);
+ if(ret > 0) {
+ char buffer[100];
+ ret = read(fd, buffer, sizeof(buffer));
+ }
+ else
+ break;
+ }
+
+ return 0;
+}
+
+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,powersensordaemon,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...");
+ options_parse_post(&opt);
+
+ 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_listen_fd = init_command_socket(opt.command_sock_);
+ if(cmd_listen_fd < 0) {
+ options_clear(&opt);
+ log_close();
+ exit(-1);
+ }
+
+ int tty_fd = 0;
+ for(;;) {
+ tty_fd = open(opt.tty_dev_, O_RDWR | O_NOCTTY);
+ if(tty_fd < 0)
+ ret = 2;
+ else {
+ ret = setup_tty(tty_fd);
+ if(ret)
+ ret = 2;
+ else
+ ret = main_loop(tty_fd, cmd_listen_fd);
+ }
+
+ if(ret == 2) {
+ log_printf(ERROR, "%s error, trying to reopen in 5 seconds..", opt.tty_dev_);
+ if(tty_fd > 0)
+ close(tty_fd);
+ sleep(5);
+ }
+ else
+ break;
+ }
+
+ close(cmd_listen_fd);
+ if(tty_fd > 0)
+ close(tty_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;
+}
projects / svn42.git / blobdiff