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@ -6,14 +6,17 @@ |
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#include <stdlib.h> |
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#include <limits.h> |
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#include <fcntl.h> |
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#include <sys/stat.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/time.h> |
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#include <sys/param.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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#include <libgen.h> |
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#include <getopt.h> |
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#include <poll.h> |
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#include <syslog.h> |
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#include "wstationd.h" |
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@ -31,7 +34,9 @@ |
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#define TIMEOUT 30 |
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static char* exec_name; |
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static char exec_name[MAXPATHLEN]; |
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static int daemonize = 1; |
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struct connection |
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{ |
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@ -48,6 +53,7 @@ static int write_connection(struct connection *); |
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static void print_help() |
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{ |
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fprintf(stdout, "usage: %s [-p port] [-b addr] directory\n", exec_name); |
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fprintf(stdout, " -d, --nodaemon Do not detach and daemonize\n"); |
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fprintf(stdout, " -p, --port <port> Port to listen on (default: 10800)\n"); |
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fprintf(stdout, " -b, --bind <address> Address to bind to (default: 0.0.0.0)\n"); |
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fprintf(stdout, " -h, --help Print this message and exit\n"); |
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@ -58,6 +64,7 @@ static void print_help() |
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int main(int argc, char* argv[]) |
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{ |
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const struct option longopts[] = { |
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{ "nodaemon", required_argument, NULL, 'd' }, |
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{ "port", required_argument, NULL, 'p' }, |
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{ "bind", required_argument, NULL, 'b' }, |
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{ "version", no_argument, NULL, 'v' }, |
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@ -72,13 +79,20 @@ int main(int argc, char* argv[]) |
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struct connection* conns[SLOTLIMIT]; |
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memset(conns, 0, sizeof(struct connection*) * SLOTLIMIT); |
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struct pollfd fds[SLOTLIMIT+1]; |
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memset(&fds, 0, sizeof(struct pollfd) * (SLOTLIMIT + 1)); |
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exec_name = basename(argv[0]); |
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if(basename_r(argv[0], exec_name) == NULL){ |
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fprintf(stderr, "%s: cannot get basename - %s\n", |
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exec_name, strerror(errno) |
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); |
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goto shutdown_error; |
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} |
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for(int ch; (ch = getopt_long(argc, argv, "l:b:p:vh0", longopts, NULL)) != -1;){ |
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for(int ch; (ch = getopt_long(argc, argv, "l:b:p:dvh0", longopts, NULL)) != -1;){ |
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switch(ch){ |
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case 'd': |
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daemonize = 0; |
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break; |
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case 'p': |
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port = (int)strtol(optarg, NULL, 10); |
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if(port < 1 || port > 65535){ |
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@ -120,14 +134,58 @@ int main(int argc, char* argv[]) |
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print_help(); |
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goto shutdown_error; |
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} |
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// Daemonize if requested |
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if(daemonize){ |
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pid_t pid = fork(); |
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// Fork failure |
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if(pid == -1){ |
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fprintf(stderr, "%s: cannot fork - %s\n", |
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exec_name, strerror(errno) |
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); |
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goto shutdown_error; |
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} |
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// Fork success, exit parent process |
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if(pid > 0){ exit(EXIT_SUCCESS); } |
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// create new session for daemon |
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if(setsid() == -1){ |
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fprintf(stderr, "%s: cannot setsid - %s\n", |
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exec_name, strerror(errno) |
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); |
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goto shutdown_error; |
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} |
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// Ensure that standard descriptors are |
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// unavailable after fork() and setsid() |
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int fd = open("/dev/null", O_RDWR, 0); |
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if(fd != -1){ |
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dup2(fd, fileno(stdin)); |
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dup2(fd, fileno(stdout)); |
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dup2(fd, fileno(stderr)); |
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} |
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// Open syslog |
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openlog(exec_name, LOG_PID, LOG_DAEMON); |
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} |
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// Change default mask |
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umask(133); |
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// Establish the socket |
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sockfd = socket(AF_INET, SOCK_STREAM, 0); |
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if(sockfd == -1){ |
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fprintf(stderr, "%s: cannot open socket - %s\n", |
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exec_name, strerror(errno) |
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); |
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if(daemonize){ |
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syslog(LOG_ERR, "cannot open socket - %s", |
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strerror(errno) |
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); |
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} else { |
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fprintf(stderr, "%s: cannot open socket - %s\n", |
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exec_name, strerror(errno) |
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); |
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} |
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goto shutdown_error; |
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} |
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@ -144,32 +202,51 @@ int main(int argc, char* argv[]) |
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// Bind our socket to the specified address and port |
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if(bind(sockfd, (struct sockaddr*)&sock, sizeof(sock)) < 0){ |
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fprintf(stderr, "%s: cannot bind - %s\n", |
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exec_name, strerror(errno) |
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); |
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if(daemonize){ |
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syslog(LOG_ERR, "cannot bind - %s", |
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strerror(errno) |
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); |
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} else { |
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fprintf(stderr, "%s: cannot bind - %s\n", |
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exec_name, strerror(errno) |
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); |
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} |
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goto shutdown_error; |
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} |
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// Listen on port |
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if(listen(sockfd, 10) != 0){ |
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fprintf(stderr, "%s: cannot listen - %s\n", |
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exec_name, strerror(errno) |
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); |
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if(daemonize){ |
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syslog(LOG_ERR, "cannot listen - %s", |
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strerror(errno) |
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); |
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} else { |
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fprintf(stderr, "%s: cannot listen - %s\n", |
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exec_name, strerror(errno) |
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); |
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} |
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goto shutdown_error; |
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} |
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struct pollfd fds[SLOTLIMIT+1]; |
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memset(&fds, 0, sizeof(struct pollfd) * (SLOTLIMIT + 1)); |
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// Add sockfd |
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fds[0].fd = sockfd; |
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fds[0].events = POLLIN; |
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fds[0].revents = 0; |
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while(1){ |
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int r = poll(fds, (SLOTLIMIT + 1), 1000); |
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if(r == -1){ |
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fprintf(stderr, "%s: socket poll error - %s\n", |
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exec_name, strerror(errno) |
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); |
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if(poll(fds, (SLOTLIMIT + 1), 1000) == -1){ |
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if(daemonize){ |
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syslog(LOG_ERR, "socket poll error - %s", |
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strerror(errno) |
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); |
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} else { |
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fprintf(stderr, "%s: socket poll error - %s\n", |
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exec_name, strerror(errno) |
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); |
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} |
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goto shutdown_error; |
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} |
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@ -238,26 +315,44 @@ int main(int argc, char* argv[]) |
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int fd = accept(sockfd, (struct sockaddr*)&client, &client_sz); |
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if(fd == -1){ |
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fprintf(stderr, "%s: accept failed - %s\n", |
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exec_name, strerror(errno) |
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); |
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if(daemonize){ |
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syslog(LOG_ERR, "accept failed - %s", |
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strerror(errno) |
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); |
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} else { |
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fprintf(stderr, "%s: accept failed - %s\n", |
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exec_name, strerror(errno) |
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); |
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} |
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continue; |
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} |
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// Get current flags before setting nonblock |
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if((flags = fcntl(fd, F_GETFL)) == -1){ |
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fprintf(stderr, "%s: cannot get connection flags - %s\n", |
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exec_name, strerror(errno) |
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); |
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if(daemonize){ |
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syslog(LOG_ERR, "cannot get connection flags - %s", |
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strerror(errno) |
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); |
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} else { |
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fprintf(stderr, "%s: cannot get connection flags - %s\n", |
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exec_name, strerror(errno) |
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); |
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} |
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close(fd); |
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continue; |
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} |
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// Set nonblocking on socket |
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if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1){ |
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fprintf(stderr, "%s: cannot set connection flags - %s\n", |
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exec_name, strerror(errno) |
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); |
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if(daemonize){ |
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syslog(LOG_ERR, "cannot set connection flags - %s", |
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strerror(errno) |
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); |
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} else { |
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fprintf(stderr, "%s: cannot set connection flags - %s\n", |
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exec_name, strerror(errno) |
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); |
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} |
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close(fd); |
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continue; |
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} |
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@ -265,7 +360,11 @@ int main(int argc, char* argv[]) |
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// Allocate memory for the connection's state. |
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conns[slotfirst - 1] = malloc(sizeof(struct connection)); |
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if(conns[slotfirst - 1] == NULL){ |
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fprintf(stderr, "%s: out of memory\n", exec_name); |
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if(daemonize){ |
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syslog(LOG_ERR, "out of memory"); |
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} else { |
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fprintf(stderr, "%s: out of memory\n", exec_name); |
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} |
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close(fd); |
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continue; |
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} |
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@ -296,6 +395,7 @@ int main(int argc, char* argv[]) |
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shutdown_error: |
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if(sockfd > 0) close(sockfd); |
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for(int i = 0; i < SLOTLIMIT; i++){ if(conns[i] != NULL) free(conns[i]); } |
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return 1; |
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} |
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@ -305,8 +405,9 @@ static int write_connection(struct connection *conn) |
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// Build a filename for the file we're writing based |
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// on the time and the source IP address |
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char timebuff[20]; |
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struct tm* timeptr = localtime(&conn->tv.tv_sec); |
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strftime(&timebuff[0], 20, "%Y%m%d%H%M%S", timeptr); |
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struct tm timeptr; |
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localtime_r(&conn->tv.tv_sec, &timeptr); |
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strftime(&timebuff[0], 20, "%Y%m%d%H%M%S", &timeptr); |
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char fnbuff[50]; |
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snprintf(&fnbuff[0], 50, "%s.%ld-%s.dat", |
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@ -316,16 +417,29 @@ static int write_connection(struct connection *conn) |
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int ofd; |
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if((ofd = open(fnbuff, O_WRONLY | O_CREAT, 0644)) == -1){ |
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fprintf(stderr, "%s: cannot open - %s\n", |
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exec_name, strerror(errno) |
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); |
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if(daemonize){ |
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syslog(LOG_ERR, "cannot open %s - %s", |
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fnbuff, strerror(errno) |
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); |
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} else { |
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fprintf(stderr, "%s: cannot open %s - %s\n", |
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exec_name, fnbuff, strerror(errno) |
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); |
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} |
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return 1; |
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} |
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// Write out the buffer |
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if(write(ofd, conn->buff, conn->len) == -1){ |
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fprintf(stderr, "%s: file write error - %s\n", |
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exec_name, strerror(errno) |
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); |
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if(daemonize){ |
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syslog(LOG_ERR, "write error on %s - %s", |
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fnbuff, strerror(errno) |
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); |
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} else { |
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fprintf(stderr, "%s: write error on %s - %s\n", |
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exec_name, fnbuff, strerror(errno) |
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); |
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} |
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close(ofd); |
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return 1; |
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} |
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