comsat.c revision 37297
1251538Srpaulo/* 2251538Srpaulo * Copyright (c) 1980, 1993 3251538Srpaulo * The Regents of the University of California. All rights reserved. 4251538Srpaulo * 5264912Skevlo * Redistribution and use in source and binary forms, with or without 6292176Savos * modification, are permitted provided that the following conditions 7251538Srpaulo * are met: 8251538Srpaulo * 1. Redistributions of source code must retain the above copyright 9251538Srpaulo * notice, this list of conditions and the following disclaimer. 10251538Srpaulo * 2. Redistributions in binary form must reproduce the above copyright 11251538Srpaulo * notice, this list of conditions and the following disclaimer in the 12251538Srpaulo * documentation and/or other materials provided with the distribution. 13251538Srpaulo * 3. All advertising materials mentioning features or use of this software 14251538Srpaulo * must display the following acknowledgement: 15251538Srpaulo * This product includes software developed by the University of 16251538Srpaulo * California, Berkeley and its contributors. 17251538Srpaulo * 4. Neither the name of the University nor the names of its contributors 18251538Srpaulo * may be used to endorse or promote products derived from this software 19251538Srpaulo * without specific prior written permission. 20251538Srpaulo * 21251538Srpaulo * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22251538Srpaulo * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23251538Srpaulo * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24251538Srpaulo * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25264912Skevlo * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26251538Srpaulo * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27251538Srpaulo * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28288353Sadrian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29288353Sadrian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30251538Srpaulo * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31251538Srpaulo * SUCH DAMAGE. 32251538Srpaulo */ 33251538Srpaulo 34251538Srpaulo#ifndef lint 35291902Skevlostatic const char copyright[] = 36251538Srpaulo"@(#) Copyright (c) 1980, 1993\n\ 37251538Srpaulo The Regents of the University of California. All rights reserved.\n"; 38251538Srpaulo#endif /* not lint */ 39251538Srpaulo 40251538Srpaulo#ifndef lint 41251538Srpaulo#if 0 42251538Srpaulostatic char sccsid[] = "@(#)comsat.c 8.1 (Berkeley) 6/4/93"; 43251538Srpaulo#endif 44251538Srpaulostatic const char rcsid[] = 45251538Srpaulo "$Id: comsat.c,v 1.11 1997/11/20 07:23:44 charnier Exp $"; 46251538Srpaulo#endif /* not lint */ 47251538Srpaulo 48251538Srpaulo#include <sys/param.h> 49251538Srpaulo#include <sys/socket.h> 50251538Srpaulo#include <sys/stat.h> 51251538Srpaulo#include <sys/file.h> 52251538Srpaulo#include <sys/wait.h> 53251538Srpaulo 54257176Sglebius#include <netinet/in.h> 55251538Srpaulo 56251538Srpaulo#include <ctype.h> 57251538Srpaulo#include <err.h> 58251538Srpaulo#include <errno.h> 59251538Srpaulo#include <netdb.h> 60251538Srpaulo#include <paths.h> 61251538Srpaulo#include <pwd.h> 62251538Srpaulo#include <termios.h> 63251538Srpaulo#include <signal.h> 64251538Srpaulo#include <stdio.h> 65251538Srpaulo#include <stdlib.h> 66251538Srpaulo#include <string.h> 67251538Srpaulo#include <syslog.h> 68288088Sadrian#include <unistd.h> 69251538Srpaulo#include <utmp.h> 70251538Srpaulo 71251538Srpauloint debug = 0; 72251538Srpaulo#define dsyslog if (debug) syslog 73251538Srpaulo 74251538Srpaulo#define MAXIDLE 120 75291902Skevlo 76251538Srpaulochar hostname[MAXHOSTNAMELEN]; 77251538Srpaulostruct utmp *utmp = NULL; 78251538Srpaulotime_t lastmsgtime; 79251538Srpauloint nutmp, uf; 80251538Srpaulo 81289167Sadrianvoid jkfprintf __P((FILE *, char[], char[], off_t)); 82251538Srpaulovoid mailfor __P((char *)); 83251538Srpaulovoid notify __P((struct utmp *, char[], off_t, int)); 84294471Savosvoid onalrm __P((int)); 85294471Savosvoid reapchildren __P((int)); 86294471Savos 87294471Savosint 88294471Savosmain(argc, argv) 89294471Savos int argc; 90294471Savos char *argv[]; 91294471Savos{ 92294471Savos struct sockaddr_in from; 93294471Savos register int cc; 94294471Savos int fromlen; 95294471Savos char msgbuf[256]; 96294471Savos 97294471Savos /* verify proper invocation */ 98294471Savos fromlen = sizeof(from); 99251538Srpaulo if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) 100294471Savos err(1, "getsockname"); 101294471Savos openlog("comsat", LOG_PID, LOG_DAEMON); 102294471Savos if (chdir(_PATH_MAILDIR)) { 103294471Savos syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR); 104294471Savos (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0); 105294471Savos exit(1); 106294471Savos } 107251538Srpaulo if ((uf = open(_PATH_UTMP, O_RDONLY, 0)) < 0) { 108251538Srpaulo syslog(LOG_ERR, "open: %s: %m", _PATH_UTMP); 109288088Sadrian (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0); 110251538Srpaulo exit(1); 111251538Srpaulo } 112251596Srpaulo (void)time(&lastmsgtime); 113251538Srpaulo (void)gethostname(hostname, sizeof(hostname)); 114264912Skevlo onalrm(0); 115264912Skevlo (void)signal(SIGALRM, onalrm); 116264912Skevlo (void)signal(SIGTTOU, SIG_IGN); 117251538Srpaulo (void)signal(SIGCHLD, reapchildren); 118251538Srpaulo for (;;) { 119251538Srpaulo cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0); 120251538Srpaulo if (cc <= 0) { 121266721Skevlo if (errno != EINTR) 122251538Srpaulo sleep(1); 123251538Srpaulo errno = 0; 124251538Srpaulo continue; 125251538Srpaulo } 126251538Srpaulo if (!nutmp) /* no one has logged in yet */ 127251538Srpaulo continue; 128251538Srpaulo sigblock(sigmask(SIGALRM)); 129251538Srpaulo msgbuf[cc] = '\0'; 130251538Srpaulo (void)time(&lastmsgtime); 131251538Srpaulo mailfor(msgbuf); 132251538Srpaulo sigsetmask(0L); 133251538Srpaulo } 134251538Srpaulo} 135251538Srpaulo 136251538Srpaulovoid 137251538Srpauloreapchildren(signo) 138252196Skevlo int signo; 139251538Srpaulo{ 140251538Srpaulo while (wait3(NULL, WNOHANG, NULL) > 0); 141251538Srpaulo} 142251538Srpaulo 143251538Srpaulovoid 144251538Srpauloonalrm(signo) 145251538Srpaulo int signo; 146251538Srpaulo{ 147251538Srpaulo static u_int utmpsize; /* last malloced size for utmp */ 148251538Srpaulo static u_int utmpmtime; /* last modification time for utmp */ 149251538Srpaulo struct stat statbf; 150251538Srpaulo 151251538Srpaulo if (time(NULL) - lastmsgtime >= MAXIDLE) 152251538Srpaulo exit(0); 153251538Srpaulo (void)alarm((u_int)15); 154251538Srpaulo (void)fstat(uf, &statbf); 155251538Srpaulo if (statbf.st_mtime > utmpmtime) { 156251538Srpaulo utmpmtime = statbf.st_mtime; 157251538Srpaulo if (statbf.st_size > utmpsize) { 158251538Srpaulo utmpsize = statbf.st_size + 10 * sizeof(struct utmp); 159251538Srpaulo if ((utmp = realloc(utmp, utmpsize)) == NULL) { 160251538Srpaulo syslog(LOG_ERR, "%s", strerror(errno)); 161251538Srpaulo exit(1); 162282119Skevlo } 163251538Srpaulo } 164251538Srpaulo (void)lseek(uf, (off_t)0, L_SET); 165251538Srpaulo nutmp = read(uf, utmp, (int)statbf.st_size)/sizeof(struct utmp); 166251538Srpaulo } 167272410Shselasky} 168251538Srpaulo 169251538Srpaulovoid 170251538Srpaulomailfor(name) 171251538Srpaulo char *name; 172251538Srpaulo{ 173251538Srpaulo register struct utmp *utp = &utmp[nutmp]; 174251538Srpaulo register char *cp; 175251538Srpaulo char *file; 176251538Srpaulo off_t offset; 177264912Skevlo int folder; 178273589Skevlo char buf[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1]; 179270191Skevlo char buf2[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1]; 180273589Skevlo 181264912Skevlo if (!(cp = strchr(name, '@'))) 182264912Skevlo return; 183264912Skevlo *cp = '\0'; 184251538Srpaulo offset = atoi(cp + 1); 185251538Srpaulo if (!(cp = strchr(cp + 1, ':'))) 186251538Srpaulo file = name; 187251538Srpaulo else 188251538Srpaulo file = cp + 1; 189251538Srpaulo sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utmp[0].ut_name), 190251538Srpaulo name); 191251538Srpaulo if (*file != '/') { 192251538Srpaulo sprintf(buf2, "%s/%.*s", _PATH_MAILDIR, 193251538Srpaulo (int)sizeof(utmp[0].ut_name), file); 194294471Savos file = buf2; 195294471Savos } 196287197Sglebius folder = strcmp(buf, file); 197287197Sglebius while (--utp >= utmp) 198251538Srpaulo if (!strncmp(utp->ut_name, name, sizeof(utmp[0].ut_name))) 199251538Srpaulo notify(utp, file, offset, folder); 200251538Srpaulo} 201251538Srpaulo 202251538Srpaulostatic char *cr; 203292207Savos 204292207Savosvoid 205292207Savosnotify(utp, file, offset, folder) 206292207Savos register struct utmp *utp; 207292207Savos char file[]; 208292167Savos off_t offset; 209292167Savos int folder; 210292207Savos{ 211292207Savos FILE *tp; 212289891Savos struct stat stb; 213289891Savos struct termios tio; 214281069Srpaulo char tty[20], name[sizeof(utmp[0].ut_name) + 1]; 215251538Srpaulo 216251538Srpaulo (void)snprintf(tty, sizeof(tty), "%s%.*s", 217251538Srpaulo _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line); 218251538Srpaulo if (strchr(tty + sizeof(_PATH_DEV) - 1, '/')) { 219251538Srpaulo /* A slash is an attempt to break security... */ 220289066Skevlo syslog(LOG_AUTH | LOG_NOTICE, "'/' in \"%s\"", tty); 221289066Skevlo return; 222251538Srpaulo } 223251538Srpaulo if (stat(tty, &stb) || !(stb.st_mode & S_IEXEC)) { 224291698Savos dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_name, tty); 225251538Srpaulo return; 226291698Savos } 227291698Savos dsyslog(LOG_DEBUG, "notify %s on %s\n", utp->ut_name, tty); 228291698Savos if (fork()) 229291698Savos return; 230251538Srpaulo (void)signal(SIGALRM, SIG_DFL); 231251538Srpaulo (void)alarm((u_int)30); 232251538Srpaulo if ((tp = fopen(tty, "w")) == NULL) { 233251538Srpaulo dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno)); 234281069Srpaulo _exit(1); 235251538Srpaulo } 236292174Savos (void)tcgetattr(fileno(tp), &tio); 237292174Savos cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r"; 238292174Savos (void)strncpy(name, utp->ut_name, sizeof(utp->ut_name)); 239264912Skevlo name[sizeof(name) - 1] = '\0'; 240264912Skevlo (void)fprintf(tp, "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s", 241281069Srpaulo cr, name, (int)sizeof(hostname), hostname, 242264912Skevlo folder ? cr : "", folder ? "to " : "", folder ? file : "", 243251538Srpaulo cr, cr); 244281069Srpaulo jkfprintf(tp, name, file, offset); 245251538Srpaulo (void)fclose(tp); 246291264Savos _exit(0); 247291264Savos} 248291264Savos 249294471Savosvoid 250291264Savosjkfprintf(tp, user, file, offset) 251291264Savos register FILE *tp; 252291264Savos char user[]; 253291264Savos char file[]; 254291264Savos off_t offset; 255291698Savos{ 256251538Srpaulo register unsigned char *cp, ch; 257291264Savos register FILE *fi; 258291264Savos register int linecnt, charcnt, inheader; 259251538Srpaulo register struct passwd *p; 260290631Savos unsigned char line[BUFSIZ]; 261290631Savos 262290631Savos /* Set effective uid to user in case mail drop is on nfs */ 263290631Savos if ((p = getpwnam(user)) != NULL) 264290631Savos (void) setuid(p->pw_uid); 265290631Savos 266290631Savos if ((fi = fopen(file, "r")) == NULL) 267292175Savos return; 268292175Savos 269292175Savos (void)fseek(fi, offset, L_SET); 270292175Savos /* 271292175Savos * Print the first 7 lines or 560 characters of the new mail 272292175Savos * (whichever comes first). Skip header crap other than 273292175Savos * From, Subject, To, and Date. 274292175Savos */ 275292175Savos linecnt = 7; 276292175Savos charcnt = 560; 277292175Savos inheader = 1; 278290651Savos while (fgets(line, sizeof(line), fi) != NULL) { 279290631Savos if (inheader) { 280290631Savos if (line[0] == '\n') { 281292203Savos inheader = 0; 282251538Srpaulo continue; 283289811Savos } 284290651Savos if (line[0] == ' ' || line[0] == '\t' || 285290651Savos (strncmp(line, "From:", 5) && 286290651Savos strncmp(line, "Subject:", 8))) 287281069Srpaulo continue; 288251538Srpaulo } 289294473Savos if (linecnt <= 0 || charcnt <= 0) { 290294473Savos (void)fprintf(tp, "...more...%s", cr); 291294473Savos (void)fclose(fi); 292251538Srpaulo return; 293251538Srpaulo } 294251538Srpaulo /* strip weird stuff so can't trojan horse stupid terminals */ 295264912Skevlo for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) { 296290630Savos /* disable upper controls and enable all other 297251538Srpaulo 8bit codes due to lack of locale knowledge 298251538Srpaulo */ 299292221Savos if (((ch & 0x80) && ch < 0xA0) || 300292221Savos (!(ch & 0x80) && !isprint(ch) && 301292221Savos !isspace(ch) && ch != '\a' && ch != '\b') 302292221Savos ) { 303290630Savos if (ch & 0x80) { 304290630Savos ch &= ~0x80; 305287197Sglebius (void)fputs("M-", tp); 306287197Sglebius } 307287197Sglebius if (iscntrl(ch)) { 308264912Skevlo ch ^= 0x40; 309264912Skevlo (void)fputc('^', tp); 310251538Srpaulo } 311251538Srpaulo } 312264912Skevlo (void)fputc(ch, tp); 313281069Srpaulo } 314251538Srpaulo (void)fputs(cr, tp); 315251538Srpaulo --linecnt; 316291902Skevlo } 317291698Savos (void)fprintf(tp, "----%s\n", cr); 318251538Srpaulo (void)fclose(fi); 319251538Srpaulo} 320251538Srpaulo