diff options
Diffstat (limited to 'libexec/comsat')
| -rw-r--r-- | libexec/comsat/Makefile | 7 | ||||
| -rw-r--r-- | libexec/comsat/comsat.8 | 115 | ||||
| -rw-r--r-- | libexec/comsat/comsat.c | 288 |
3 files changed, 410 insertions, 0 deletions
diff --git a/libexec/comsat/Makefile b/libexec/comsat/Makefile new file mode 100644 index 0000000..c501ccc --- /dev/null +++ b/libexec/comsat/Makefile @@ -0,0 +1,7 @@ +# @(#)Makefile 8.1 (Berkeley) 6/4/93 +# $FreeBSD$ + +PROG= comsat +MAN= comsat.8 + +.include <bsd.prog.mk> diff --git a/libexec/comsat/comsat.8 b/libexec/comsat/comsat.8 new file mode 100644 index 0000000..5597602 --- /dev/null +++ b/libexec/comsat/comsat.8 @@ -0,0 +1,115 @@ +.\" Copyright (c) 1983, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)comsat.8 8.1 (Berkeley) 6/4/93 +.\" $FreeBSD$ +.\" +.Dd January 21, 2010 +.Dt COMSAT 8 +.Os +.Sh NAME +.Nm comsat +.Nd biff server +.Sh SYNOPSIS +.Nm +.Sh DESCRIPTION +The +.Nm +utility is the server process which receives reports of incoming mail +and notifies users if they have requested this service. +The +.Nm +utility receives messages on a datagram port associated with the +.Dq biff +service +specification (see +.Xr services 5 +and +.Xr inetd 8 ) . +The one line messages are of the form: +.Pp +.D1 Ar user Ns @ Ns Ar mailbox Ns - Ns Ar offset Ns Op : Ns Ar mailbox-name +.Pp +If the +.Ar user +specified is logged in to the system and the associated terminal has +the owner execute bit turned on (by a +.Dq Nm biff Cm y ) , +the +.Ar offset +is used as a seek offset into the appropriate mailbox file and +the first 7 lines or 560 characters of the message are printed +on the user's terminal. +Lines which appear to be part of +the message header other than the +.Dq Li From , +.Dq Li \&To , +.Dq Li Date , +or +.Dq Li Subject +lines are not included in the displayed message. +.Pp +If the +.Ar user +specified is logged in to the system and the associated terminal has +the group execute bit turned on (by a +.Dq Nm biff Cm b ) , +two bell characters +.Tn ( ASCII +\\007) are printed on the user's terminal. +.Pp +If +.Ar mailbox-name +omitted, standard mailbox assumed. +.Sh FILES +.Bl -tag -width ".Pa /var/mail/user" -compact +.It Pa /var/run/utx.active +to find out who is logged on and on what terminals +.It Pa /var/mail/user +standard mailbox +.El +.Sh SEE ALSO +.Xr biff 1 , +.Xr inetd 8 +.Sh HISTORY +The +.Nm +utility appeared in +.Bx 4.2 . +.Sh BUGS +The message header filtering is prone to error. +The density of the information presented is near the theoretical minimum. +.Pp +Users should be notified of mail which arrives on other +machines than the one to which they are currently logged in. +.Pp +The notification should appear in a separate window so it +does not mess up the screen. diff --git a/libexec/comsat/comsat.c b/libexec/comsat/comsat.c new file mode 100644 index 0000000..d15c2a4 --- /dev/null +++ b/libexec/comsat/comsat.c @@ -0,0 +1,288 @@ +/* + * Copyright (c) 1980, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static const char copyright[] = +"@(#) Copyright (c) 1980, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)comsat.c 8.1 (Berkeley) 6/4/93"; +#endif +static const char rcsid[] = + "$FreeBSD$"; +#endif /* not lint */ + +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/stat.h> +#include <sys/file.h> +#include <sys/wait.h> + +#include <netinet/in.h> + +#include <ctype.h> +#include <err.h> +#include <errno.h> +#include <netdb.h> +#include <paths.h> +#include <pwd.h> +#include <termios.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> +#include <utmpx.h> + +static int debug = 0; +#define dsyslog if (debug) syslog + +#define MAXIDLE 120 + +static char hostname[MAXHOSTNAMELEN]; + +static void jkfprintf(FILE *, char[], char[], off_t); +static void mailfor(char *); +static void notify(struct utmpx *, char[], off_t, int); +static void reapchildren(int); + +int +main(int argc __unused, char *argv[] __unused) +{ + struct sockaddr_in from; + socklen_t fromlen; + int cc; + char msgbuf[256]; + + /* verify proper invocation */ + fromlen = sizeof(from); + if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) + err(1, "getsockname"); + openlog("comsat", LOG_PID, LOG_DAEMON); + if (chdir(_PATH_MAILDIR)) { + syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR); + (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0); + exit(1); + } + (void)gethostname(hostname, sizeof(hostname)); + (void)signal(SIGTTOU, SIG_IGN); + (void)signal(SIGCHLD, reapchildren); + for (;;) { + cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0); + if (cc <= 0) { + if (errno != EINTR) + sleep(1); + errno = 0; + continue; + } + msgbuf[cc] = '\0'; + mailfor(msgbuf); + sigsetmask(0L); + } +} + +static void +reapchildren(int signo __unused) +{ + while (wait3(NULL, WNOHANG, NULL) > 0); +} + +static void +mailfor(char *name) +{ + struct utmpx *utp; + char *cp; + char *file; + off_t offset; + int folder; + char buf[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1]; + char buf2[sizeof(_PATH_MAILDIR) + sizeof(utp->ut_user) + 1]; + + if (!(cp = strchr(name, '@'))) + return; + *cp = '\0'; + offset = strtoll(cp + 1, NULL, 10); + if (!(cp = strchr(cp + 1, ':'))) + file = name; + else + file = cp + 1; + sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utp->ut_user), + name); + if (*file != '/') { + sprintf(buf2, "%s/%.*s", _PATH_MAILDIR, + (int)sizeof(utp->ut_user), file); + file = buf2; + } + folder = strcmp(buf, file); + setutxent(); + while ((utp = getutxent()) != NULL) + if (utp->ut_type == USER_PROCESS && !strcmp(utp->ut_user, name)) + notify(utp, file, offset, folder); + endutxent(); +} + +static const char *cr; + +static void +notify(struct utmpx *utp, char file[], off_t offset, int folder) +{ + FILE *tp; + struct stat stb; + struct termios tio; + char tty[20]; + const char *s = utp->ut_line; + + if (strncmp(s, "pts/", 4) == 0) + s += 4; + if (strchr(s, '/')) { + /* A slash is an attempt to break security... */ + syslog(LOG_AUTH | LOG_NOTICE, "Unexpected `/' in `%s'", + utp->ut_line); + return; + } + (void)snprintf(tty, sizeof(tty), "%s%.*s", + _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line); + if (stat(tty, &stb) == -1 || !(stb.st_mode & (S_IXUSR | S_IXGRP))) { + dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_user, tty); + return; + } + dsyslog(LOG_DEBUG, "notify %s on %s", utp->ut_user, tty); + switch (fork()) { + case -1: + syslog(LOG_NOTICE, "fork failed (%m)"); + return; + case 0: + break; + default: + return; + } + if ((tp = fopen(tty, "w")) == NULL) { + dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno)); + _exit(1); + } + (void)tcgetattr(fileno(tp), &tio); + cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r"; + switch (stb.st_mode & (S_IXUSR | S_IXGRP)) { + case S_IXUSR: + case (S_IXUSR | S_IXGRP): + (void)fprintf(tp, + "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s", + cr, utp->ut_user, (int)sizeof(hostname), hostname, + folder ? cr : "", folder ? "to " : "", folder ? file : "", + cr, cr); + jkfprintf(tp, utp->ut_user, file, offset); + break; + case S_IXGRP: + (void)fprintf(tp, "\007"); + (void)fflush(tp); + (void)sleep(1); + (void)fprintf(tp, "\007"); + break; + default: + break; + } + (void)fclose(tp); + _exit(0); +} + +static void +jkfprintf(FILE *tp, char user[], char file[], off_t offset) +{ + unsigned char *cp, ch; + FILE *fi; + int linecnt, charcnt, inheader; + struct passwd *p; + unsigned char line[BUFSIZ]; + + /* Set effective uid to user in case mail drop is on nfs */ + if ((p = getpwnam(user)) != NULL) + (void) setuid(p->pw_uid); + + if ((fi = fopen(file, "r")) == NULL) + return; + + (void)fseeko(fi, offset, SEEK_CUR); + /* + * Print the first 7 lines or 560 characters of the new mail + * (whichever comes first). Skip header crap other than + * From, Subject, To, and Date. + */ + linecnt = 7; + charcnt = 560; + inheader = 1; + while (fgets(line, sizeof(line), fi) != NULL) { + if (inheader) { + if (line[0] == '\n') { + inheader = 0; + continue; + } + if (line[0] == ' ' || line[0] == '\t' || + (strncmp(line, "From:", 5) && + strncmp(line, "Subject:", 8))) + continue; + } + if (linecnt <= 0 || charcnt <= 0) { + (void)fprintf(tp, "...more...%s", cr); + (void)fclose(fi); + return; + } + /* strip weird stuff so can't trojan horse stupid terminals */ + for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) { + /* disable upper controls and enable all other + 8bit codes due to lack of locale knowledge + */ + if (((ch & 0x80) && ch < 0xA0) || + (!(ch & 0x80) && !isprint(ch) && + !isspace(ch) && ch != '\a' && ch != '\b') + ) { + if (ch & 0x80) { + ch &= ~0x80; + (void)fputs("M-", tp); + } + if (iscntrl(ch)) { + ch ^= 0x40; + (void)fputc('^', tp); + } + } + (void)fputc(ch, tp); + } + (void)fputs(cr, tp); + --linecnt; + } + (void)fprintf(tp, "----%s\n", cr); + (void)fclose(fi); +} |
