diff options
Diffstat (limited to 'contrib/p910nd-0.8/p910nd.c')
| -rw-r--r-- | contrib/p910nd-0.8/p910nd.c | 420 |
1 files changed, 0 insertions, 420 deletions
diff --git a/contrib/p910nd-0.8/p910nd.c b/contrib/p910nd-0.8/p910nd.c deleted file mode 100644 index c2473d8d..00000000 --- a/contrib/p910nd-0.8/p910nd.c +++ /dev/null @@ -1,420 +0,0 @@ -/* - * Port 9100+n daemon - * Accepts a connection from port 9100+n and copy stream to - * /dev/lpn, where n = 0,1,2. - * - * Run standalone as: p910nd [0|1|2] - * - * Run under inetd as: - * p910n stream tcp nowait root /usr/sbin/tcpd p910nd [0|1|2] - * where p910n is an /etc/services entry for - * port 9100, 9101 or 9102 as the case may be. - * root can be replaced by any uid with rw permission on /dev/lpn - * - * Port 9100+n will then be passively opened - * n defaults to 0 - * - * Version 0.8 - * Allow specifying address to bind to - * - * Version 0.7 - * Bidirectional data transfer - * - * Version 0.6 - * Arne Bernin fixed some cast warnings, corrected the version number - * and added a -v option to print the version. - * - * Version 0.5 - * -DUSE_LIBWRAP and -lwrap enables hosts_access (tcpwrappers) checking. - * - * Version 0.4 - * Ken Yap (ken_yap@users.sourceforge.net), April 2001 - * Placed under GPL. - * - * Added -f switch to specify device which overrides /dev/lpn. - * But number is still required get distinct ports and locks. - * - * Added locking so that two invocations of the daemon under inetd - * don't try to open the printer at the same time. This can happen - * even if there is one host running clients because the previous - * client can exit after it has sent all data but the printer has not - * finished printing and inetd starts up a new daemon when the next - * request comes in too soon. - * - * Various things could be Linux specific. I don't - * think there is much demand for this program outside of PCs, - * but if you port it to other distributions or platforms, - * I'd be happy to receive your patches. - */ - -#include <unistd.h> -#include <stdlib.h> -#include <stdio.h> -#include <getopt.h> -#include <ctype.h> -#include <string.h> -#include <fcntl.h> -#include <netdb.h> -#include <syslog.h> -#include <errno.h> -#include <sys/types.h> -#include <sys/time.h> -#include <sys/resource.h> -#include <sys/stat.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <arpa/inet.h> - -#ifdef USE_LIBWRAP -#include "tcpd.h" -int allow_severity, deny_severity; -extern int hosts_ctl(char *daemon, char *client_name, - char *client_addr, char *client_user); -#endif - -#define BASEPORT 9100 -#define PIDFILE "/var/run/p910%cd.pid" -#ifdef LOCKFILE_DIR -#define LOCKFILE LOCKFILE_DIR "/p910%cd" -#else -#define LOCKFILE "/var/lock/subsys/p910%cd" -#endif -#define PRINTERFILE "/dev/lp%c" -#define LOGOPTS LOG_ERR - -static char *progname; -static char version[] = "p910nd Version 0.8"; -static int lockfd = -1; -static char *device = 0; -static int bidir = 0; -static char *bindaddr = 0; - -void usage(void) -{ - fprintf(stderr, "Usage: %s [-f device] [-i bindaddr] [-bv] [0|1|2]\n", progname); - exit(1); -} - -void show_version (void) -{ - fprintf(stdout, "%s \n", version); -} - -FILE *open_printer(int lpnumber) -{ - FILE *f; - char lpname[sizeof(PRINTERFILE)]; - -#ifdef TESTING - (void)snprintf(lpname, sizeof(lpname), "/dev/tty"); -#else - (void)snprintf(lpname, sizeof(lpname), PRINTERFILE, lpnumber); -#endif - if (device == 0) - device = lpname; - if ((f = fopen(device, bidir ? "w+" : "w")) == NULL) - { - syslog(LOGOPTS, "%s: %m\n", device); - exit(1); - } - return (f); -} - -int get_lock(int lpnumber) -{ - char lockname[sizeof(LOCKFILE)]; - struct flock lplock; - - (void)snprintf(lockname, sizeof(lockname), LOCKFILE, lpnumber); - if ((lockfd = open(lockname, O_CREAT|O_RDWR)) < 0) - { - syslog(LOGOPTS, "%s: %m\n", lockname); - return (0); - } - memset(&lplock, 0, sizeof(lplock)); - lplock.l_type = F_WRLCK; - lplock.l_pid = getpid(); - if (fcntl(lockfd, F_SETLKW, &lplock) < 0) - { - syslog(LOGOPTS, "%s: %m\n", lockname); - return (0); - } - return (1); -} - -void free_lock(void) -{ - if (lockfd >= 0) - (void)close(lockfd); -} - -/* Copy network socket to FILE f until EOS */ -int copy_stream(int fd, FILE *f) -{ - int nread; - char buffer[8192]; - - if (bidir) { - FILE *nf; - - if ((nf = fdopen(fd, "w")) == NULL) { - syslog(LOGOPTS, "fdopen: %m\n"); - } - for (;;) { - fd_set readfds; - int result; - int maxfd = fileno(f) > fd ? fileno(f) : fd; - FD_ZERO(&readfds); - FD_SET(fileno(f), &readfds); - FD_SET(fd, &readfds); - result = select(maxfd + 1, &readfds, 0, 0, 0); - if (result < 0) - return (result); - if (result == 0) - continue; - if (FD_ISSET(fd, &readfds)) { - nread = read(fd, buffer, sizeof(buffer)); - if (nread <= 0) - break; - (void)fwrite(buffer, sizeof(char), nread, f); - } - if (FD_ISSET(fileno(f), &readfds)) { - nread = read(fileno(f), buffer, sizeof(buffer)); - if (nread > 0 && nf != NULL) { - (void)fwrite(buffer, sizeof(char), nread, nf); - (void)fflush(nf); - } - } - } - (void)fflush(f); - (void)fclose(nf); - return (0); - } else { - while ((nread = read(fd, buffer, sizeof(buffer))) > 0) - (void)fwrite(buffer, sizeof(char), nread, f); - (void)fflush(f); - return (nread); - } -} - -void one_job(int lpnumber) -{ - FILE *f; - struct sockaddr_in client; - socklen_t clientlen = sizeof(client); - - if (getpeername(0, (struct sockaddr*) &client, &clientlen) >= 0) - syslog(LOGOPTS, "Connection from %s port %hu\n", - inet_ntoa(client.sin_addr), - ntohs(client.sin_port)); - if (get_lock(lpnumber) == 0) - return; - f = open_printer(lpnumber); - if (copy_stream(0, f) < 0) - syslog(LOGOPTS, "copy_stream: %m\n"); - fclose(f); - free_lock(); -} - -void server(int lpnumber) -{ - struct rlimit resourcelimit; -#ifdef USE_GETPROTOBYNAME - struct protoent *proto; -#endif - int netfd, fd, one = 1; - socklen_t clientlen; - struct sockaddr_in netaddr, client; - char pidfilename[sizeof(PIDFILE)]; - FILE *f; - int ipret; - -#ifndef TESTING - switch (fork()) - { - case -1: - syslog(LOGOPTS, "fork: %m\n"); - exit (1); - case 0: /* child */ - break; - default: /* parent */ - exit(0); - } - /* Now in child process */ - resourcelimit.rlim_max = 0; - if (getrlimit(RLIMIT_NOFILE, &resourcelimit) < 0) - { - syslog(LOGOPTS, "getrlimit: %m\n"); - exit(1); - } - for (fd = 0; fd < resourcelimit.rlim_max; ++fd) - (void)close(fd); - if (setsid() < 0) - { - syslog(LOGOPTS, "setsid: %m\n"); - exit(1); - } - (void)chdir("/"); - (void)umask(022); - fd = open("/dev/null", O_RDWR); /* stdin */ - (void)dup(fd); /* stdout */ - (void)dup(fd); /* stderr */ - (void)snprintf(pidfilename, sizeof(pidfilename), PIDFILE, lpnumber); - if ((f = fopen(pidfilename, "w")) == NULL) - { - syslog(LOGOPTS, "%s: %m\n", pidfilename); - exit(1); - } - (void)fprintf(f, "%d\n", getpid()); - (void)fclose(f); - if (get_lock(lpnumber) == 0) - exit(1); -#endif - f = open_printer(lpnumber); -#ifdef USE_GETPROTOBYNAME - if ((proto = getprotobyname("tcp")) == NULL) - { - syslog(LOGOPTS, "Cannot find protocol for TCP!\n"); - exit(1); - } - if ((netfd = socket(AF_INET, SOCK_STREAM, proto->p_proto)) < 0) -#else - if ((netfd = socket(AF_INET, SOCK_STREAM, IPPROTO_IP)) < 0) -#endif - { - syslog(LOGOPTS, "socket: %m\n"); - exit(1); - } - if (setsockopt(netfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) - { - syslog(LOGOPTS, "setsocketopt: %m\n"); - exit(1); - } - netaddr.sin_port = htons(BASEPORT + lpnumber - '0'); - if (bindaddr == 0) { - netaddr.sin_addr.s_addr = htonl(INADDR_ANY); - } else { - ipret = inet_pton(AF_INET, bindaddr, &netaddr.sin_addr.s_addr); - if (ipret < 0) { - syslog(LOGOPTS, "inet_pton: %m\n"); - exit(1); - } else if (ipret == 0) { - syslog(LOGOPTS, "inet_pton: invalid bind IP address\n"); - exit(1); - } - } - memset(netaddr.sin_zero, 0, sizeof(netaddr.sin_zero)); - if (bind(netfd, (struct sockaddr*) &netaddr, sizeof(netaddr)) < 0) - { - syslog(LOGOPTS, "bind: %m\n"); - exit(1); - } - if (listen(netfd, 5) < 0) - { - syslog(LOGOPTS, "listen: %m\n"); - exit(1); - } - clientlen = sizeof(client); - memset(&client, 0, sizeof(client)); - while ((fd = accept(netfd, (struct sockaddr*) &client, &clientlen)) >= 0) - { -#ifdef USE_LIBWRAP - if (hosts_ctl("p910nd", STRING_UNKNOWN, - inet_ntoa(client.sin_addr), STRING_UNKNOWN) == 0) { - syslog(LOGOPTS, "Connection from %s port %hd rejected\n", - inet_ntoa(client.sin_addr), - ntohs(client.sin_port)); - close(fd); - continue; - } -#endif - syslog(LOGOPTS, "Connection from %s port %hd accepted\n", - inet_ntoa(client.sin_addr), - ntohs(client.sin_port)); - /*write(fd, "Printing", 8);*/ - if (copy_stream(fd, f) < 0) - syslog(LOGOPTS, "copy_stream: %m\n"); - (void)close(fd); - } - syslog(LOGOPTS, "accept: %m\n"); - free_lock(); - exit(1); -} - -int is_standalone(void) -{ - struct sockaddr_in bind_addr; - socklen_t ba_len; - - /* - * Check to see if a socket was passed to us from inetd. - * - * Use getsockname() to determine if descriptor 0 is indeed a socket - * (and thus we are probably a child of inetd) or if it is instead - * something else and we are running standalone. - */ - ba_len = sizeof(bind_addr); - if (getsockname(0, (struct sockaddr*) &bind_addr, &ba_len) == 0) - return (0); /* under inetd */ - if (errno != ENOTSOCK) /* strange... */ - syslog(LOGOPTS, "getsockname: %m\n"); - return (1); -} - -int main(int argc, char *argv[]) -{ - int c, lpnumber; - char *p; - - if (argc <= 0) /* in case not provided in inetd.conf */ - progname = "p910nd"; - else - { - progname = argv[0]; - if ((p = strrchr(progname, '/')) != 0) - progname = p + 1; - } - lpnumber = '0'; - while ((c = getopt(argc, argv, "bi:f:v")) != EOF) - { - switch (c) - { - case 'b': - bidir = 1; - break; - case 'f': - device = optarg; - break; - case 'i': - bindaddr = optarg; - break; - case 'v': - show_version(); - break; - default: - usage(); - break; - } - } - argc -= optind; - argv += optind; - if (argc > 0) - { - if (isdigit(argv[0][0])) - lpnumber = argv[0][0]; - } - /* change the n in argv[0] to match the port so ps will show that */ - if ((p = strstr(progname, "p910n")) != NULL) - p[4] = lpnumber; - - /* We used to pass (LOG_PERROR|LOG_PID|LOG_LPR|LOG_ERR) to syslog, but - * syslog ignored the LOG_PID and LOG_PERROR option. I.e. the intention - * was to add both options but the effect was to have neither. - * I disagree with the intention to add PERROR. --Stef */ - openlog (p, LOG_PID, LOG_LPR); - if (is_standalone()) - server(lpnumber); - else - one_job(lpnumber); - return (0); -} |