/* $OpenBSD: lpr.c,v 1.38 2005/11/12 00:54:15 deraadt Exp $ */ /* $NetBSD: lpr.c,v 1.19 2000/10/11 20:23:52 is Exp $ */ /* * Copyright (c) 1983, 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * * 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. 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) 1983, 1989, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static const char sccsid[] = "@(#)lpr.c 8.4 (Berkeley) 4/28/95"; #else static const char rcsid[] = "$OpenBSD: lpr.c,v 1.38 2005/11/12 00:54:15 deraadt Exp $"; #endif #endif /* not lint */ /* * lpr -- off line print * * Allows multiple printers and printers on remote machines by * using information from a printer data base. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "lp.h" #include "lp.local.h" #include "pathnames.h" static char *cfname; /* daemon control files, linked from tf's */ static char *class = host; /* class title on header page */ static char *dfname; /* data files */ static char *fonts[4]; /* troff font names */ static char format = 'f'; /* format char for printing files */ static int hdr = 1; /* print header or not (default is yes) */ static int iflag; /* indentation wanted */ static int inchar; /* location to increment char in file names */ static int indent; /* amount to indent */ static char *jobname; /* job name on header page */ static int mailflg; /* send mail */ static int nact; /* number of jobs to act on */ static int ncopies = 1; /* # of copies to make */ static const char *person; /* user name */ static int qflag; /* q job, but don't exec daemon */ static int rflag; /* remove files upon completion */ static int sflag; /* symbolic link flag */ static int tfd; /* control file descriptor */ static char *tfname; /* tmp copy of cf before linking */ static char *title; /* pr'ing title */ static char *width; /* width for versatec printing */ static struct stat statb; volatile sig_atomic_t gotintr; static void card(int, const char *); static void chkprinter(char *); static void cleanup(int); static void copy(int, char *); static char *itoa(int); static char *linked(char *); static char *lmktemp(char *, int); static void mktemps(void); static int nfile(char *); static int test(char *); static __dead void usage(void); int main(int argc, char **argv) { struct passwd *pw; struct group *gptr; char *arg, *cp; char buf[MAXPATHLEN]; int i, f, ch; struct stat stb; /* * Simulate setuid daemon w/ PRIV_END called. * We don't want lpr to actually be setuid daemon since that * requires that the lpr binary be owned by user daemon, which * is potentially unsafe. */ if ((pw = getpwuid(DEFUID)) == NULL) errx(1, "daemon uid (%u) not in password file", DEFUID); effective_uid = pw->pw_uid; real_uid = getuid(); effective_gid = pw->pw_gid; real_gid = getgid(); setresgid(real_gid, real_gid, effective_gid); setresuid(real_uid, real_uid, effective_uid); if (signal(SIGHUP, SIG_IGN) != SIG_IGN) signal(SIGHUP, cleanup); if (signal(SIGINT, SIG_IGN) != SIG_IGN) signal(SIGINT, cleanup); if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) signal(SIGQUIT, cleanup); if (signal(SIGTERM, SIG_IGN) != SIG_IGN) signal(SIGTERM, cleanup); gethostname(host, sizeof (host)); openlog("lpr", 0, LOG_LPR); while ((ch = getopt(argc, argv, ":#:1:2:3:4:C:J:P:T:U:cdfghi:lmnpqrstvw:")) != -1) { switch (ch) { case '#': /* n copies */ if (isdigit(*optarg)) { i = atoi(optarg); if (i > 0) ncopies = i; } case '4': /* troff fonts */ case '3': case '2': case '1': fonts[ch - '1'] = optarg; break; case 'C': /* classification spec */ hdr++; class = optarg; break; case 'J': /* job name */ hdr++; jobname = optarg; break; case 'P': /* specifiy printer name */ printer = optarg; break; case 'T': /* pr's title line */ title = optarg; break; case 'U': /* user name */ hdr++; person = optarg; break; case 'c': /* print cifplot output */ case 'd': /* print tex output (dvi files) */ case 'g': /* print graph(1G) output */ case 'l': /* literal output */ case 'n': /* print ditroff output */ case 'p': /* print using ``pr'' */ case 't': /* print troff output (cat files) */ case 'v': /* print vplot output */ format = ch; break; case 'f': /* print fortran output */ format = 'r'; break; case 'h': /* toggle want of header page */ hdr = !hdr; break; case 'i': /* indent output */ iflag++; indent = atoi(optarg); if (indent < 0) indent = 8; break; case 'm': /* send mail when done */ mailflg++; break; case 'q': /* just q job */ qflag++; break; case 'r': /* remove file when done */ rflag++; break; case 's': /* try to link files */ sflag++; break; case 'w': /* versatec page width */ width = optarg; break; case ':': /* catch "missing argument" error */ if (optopt == 'i') { iflag++; /* -i without args is valid */ indent = 8; } else usage(); break; default: usage(); } } argc -= optind; argv += optind; if (printer == NULL && (printer = getenv("PRINTER")) == NULL) printer = DEFLP; chkprinter(printer); if (SC && ncopies > 1) errx(1, "multiple copies are not allowed"); if (MC > 0 && ncopies > MC) errx(1, "only %ld copies are allowed", MC); /* * Get the identity of the person doing the lpr using the same * algorithm as lprm. */ if (real_uid != DU || person == NULL) { if ((pw = getpwuid(real_uid)) == NULL) errx(1, "Who are you?"); if ((person = strdup(pw->pw_name)) == NULL) err(1, NULL); } /* * Check for restricted group access. */ if (RG != NULL && real_uid != DU) { if ((gptr = getgrnam(RG)) == NULL) errx(1, "Restricted group specified incorrectly"); if (gptr->gr_gid != getgid()) { while (*gptr->gr_mem != NULL) { if ((strcmp(person, *gptr->gr_mem)) == 0) break; gptr->gr_mem++; } if (*gptr->gr_mem == NULL) errx(1, "Not a member of the restricted group"); } } /* * Check to make sure queuing is enabled if real_uid is not root. */ (void)snprintf(buf, sizeof(buf), "%s/%s", SD, LO); if (real_uid && stat(buf, &stb) == 0 && (stb.st_mode & 010)) errx(1, "Printer queue is disabled"); /* * Initialize the control file. */ mktemps(); tfd = nfile(tfname); card('H', host); card('P', person); if (hdr) { if (jobname == NULL) { if (argc == 0) jobname = "stdin"; else jobname = (arg = strrchr(argv[0], '/')) ? arg + 1 : argv[0]; } card('J', jobname); card('C', class); if (!SH) card('L', person); } if (iflag) card('I', itoa(indent)); if (mailflg) card('M', person); if (format == 't' || format == 'n' || format == 'd') for (i = 0; i < 4; i++) if (fonts[i] != NULL) card('1'+i, fonts[i]); if (width != NULL) card('W', width); /* * Read the files and spool them. */ if (argc == 0) copy(0, " "); else while (argc--) { if (argv[0][0] == '-' && argv[0][1] == '\0') { /* use stdin */ copy(0, " "); argv++; continue; } if ((f = test(arg = *argv++)) < 0) continue; /* file unreasonable */ if (sflag && (cp = linked(arg)) != NULL) { (void)snprintf(buf, sizeof(buf), "%d %d", statb.st_dev, statb.st_ino); card('S', buf); if (format == 'p') card('T', title ? title : arg); for (i = 0; i < ncopies; i++) card(format, &dfname[inchar-2]); card('U', &dfname[inchar-2]); if (f) card('U', cp); card('N', arg); dfname[inchar]++; nact++; continue; } if (sflag) warnx("%s: not linked, copying instead", arg); if ((i = safe_open(arg, O_RDONLY, 0)) < 0) warn("%s", arg); else { copy(i, arg); (void)close(i); if (f && unlink(arg) < 0) warnx("%s: not removed", arg); } } if (nact) { (void)close(tfd); tfname[inchar]--; /* * Touch the control file to fix position in the queue. */ PRIV_START; if ((tfd = safe_open(tfname, O_RDWR|O_NOFOLLOW, 0)) >= 0) { char c; if (read(tfd, &c, 1) == 1 && lseek(tfd, (off_t)0, 0) == 0 && write(tfd, &c, 1) != 1) { warn("%s", tfname); tfname[inchar]++; cleanup(0); } (void)close(tfd); } if (link(tfname, cfname) < 0) { warn("cannot rename %s", cfname); tfname[inchar]++; cleanup(0); } unlink(tfname); PRIV_END; if (qflag) /* just q things up */ exit(0); if (!startdaemon(printer)) printf("jobs queued, but cannot start daemon.\n"); exit(0); } cleanup(0); return (1); /* NOTREACHED */ } /* * Create the file n and copy from file descriptor f. */ static void copy(int f, char *n) { int fd, i, nr, nc; char buf[BUFSIZ]; if (format == 'p') card('T', title ? title : n); for (i = 0; i < ncopies; i++) card(format, &dfname[inchar-2]); card('U', &dfname[inchar-2]); card('N', n); fd = nfile(dfname); nr = nc = 0; while ((i = read(f, buf, sizeof(buf))) > 0) { if (write(fd, buf, i) != i) { warn("%s", n); break; } nc += i; if (nc >= sizeof(buf)) { nc -= sizeof(buf); nr++; if (MX > 0 && nr > MX) { warnx("%s: copy file is too large", n); break; } } } (void)close(fd); if (nc==0 && nr==0) warnx("%s: empty input file", f ? n : "stdin"); else nact++; } /* * Try and link the file to dfname. Return a pointer to the full * path name if successful. */ static char * linked(char *file) { char *cp; static char buf[MAXPATHLEN]; int ret; if (*file != '/') { if (getcwd(buf, sizeof(buf)) == NULL) return(NULL); while (file[0] == '.') { switch (file[1]) { case '/': file += 2; continue; case '.': if (file[2] == '/') { if ((cp = strrchr(buf, '/')) != NULL) *cp = '\0'; file += 3; continue; } } break; } if (strlcat(buf, "/", sizeof(buf)) >= sizeof(buf) || strlcat(buf, file, sizeof(buf)) >= sizeof(buf)) return(NULL); file = buf; } PRIV_START; ret = symlink(file, dfname); PRIV_END; return(ret ? NULL : file); } /* * Put a line into the control file. */ static void card(int c, const char *p2) { char buf[BUFSIZ]; char *p1 = buf; int len = 2; if (strlen(p2) > sizeof(buf) - 2) errx(1, "Internal error: String longer than %ld", (long)sizeof(buf)); *p1++ = c; while ((c = *p2++) != '\0' && len < sizeof(buf)) { *p1++ = (c == '\n') ? ' ' : c; len++; } *p1++ = '\n'; write(tfd, buf, len); } /* * Create a new file in the spool directory. */ static int nfile(char *n) { int f; int oldumask = umask(0); /* should block signals */ PRIV_START; f = open(n, O_WRONLY|O_EXCL|O_CREAT, FILMOD); (void)umask(oldumask); if (f < 0) { warn("%s", n); cleanup(0); } PRIV_END; if (++n[inchar] > 'z') { if (++n[inchar-2] == 't') { warnx("too many files - break up the job"); cleanup(0); } n[inchar] = 'A'; } else if (n[inchar] == '[') n[inchar] = 'a'; return (f); } /* * Cleanup after interrupts and errors. */ static void cleanup(int signo) { int i; signal(SIGHUP, SIG_IGN); signal(SIGINT, SIG_IGN); signal(SIGQUIT, SIG_IGN); signal(SIGTERM, SIG_IGN); i = inchar; PRIV_START; if (tfname) do unlink(tfname); while (tfname[i]-- != 'A'); if (cfname) do unlink(cfname); while (cfname[i]-- != 'A'); if (dfname) do { do unlink(dfname); while (dfname[i]-- != 'A'); dfname[i] = 'z'; } while (dfname[i-2]-- != 'd'); _exit(1); } /* * Test to see if this is a printable file. * Return -1 if it is not, 0 if its printable, and 1 if * we should remove it after printing. */ static int test(char *file) { int fd; char *cp; if ((fd = open(file, O_RDONLY|O_NONBLOCK)) < 0) { warn("cannot open %s", file); goto bad; } if (fstat(fd, &statb) < 0) { warn("cannot stat %s", file); goto bad; } if (S_ISDIR(statb.st_mode)) { warnx("%s is a directory", file); goto bad; } if (!S_ISREG(statb.st_mode)) { warnx("%s is not a regular file", file); goto bad; } if (statb.st_size == 0) { warnx("%s is an empty file", file); goto bad; } (void)close(fd); if (rflag) { if ((cp = strrchr(file, '/')) == NULL) { if (access(".", 2) == 0) return(1); } else { if (cp == file) { fd = access("/", 2); } else { *cp = '\0'; fd = access(file, 2); *cp = '/'; } if (fd == 0) return(1); } warnx("%s is not removable by you", file); } return(0); bad: return(-1); } /* * itoa - integer to string conversion */ static char * itoa(int i) { static char b[10] = "########"; char *p; p = &b[8]; do *p-- = i%10 + '0'; while (i /= 10) ; return(++p); } /* * Perform lookup for printer name or abbreviation -- */ static void chkprinter(char *s) { int status; if ((status = cgetent(&bp, printcapdb, s)) == -2) errx(1, "cannot open printer description file"); else if (status == -1) errx(1, "%s: unknown printer", s); if (cgetstr(bp, "sd", &SD) == -1) SD = _PATH_DEFSPOOL; if (cgetstr(bp, "lo", &LO) == -1) LO = DEFLOCK; cgetstr(bp, "rg", &RG); if (cgetnum(bp, "mx", &MX) < 0) MX = DEFMX; if (cgetnum(bp,"mc", &MC) < 0) MC = DEFMAXCOPIES; if (cgetnum(bp, "du", &DU) < 0) DU = DEFUID; SC = (cgetcap(bp, "sc", ':') != NULL); SH = (cgetcap(bp, "sh", ':') != NULL); } /* * Make the temp files. */ static void mktemps(void) { int len, fd, n; char *cp; char buf[BUFSIZ]; struct stat stb; if (snprintf(buf, sizeof(buf), "%s/.seq", SD) >= sizeof(buf)) errx(1, "%s/.seq: %s", SD, strerror(ENAMETOOLONG)); PRIV_START; if ((fd = safe_open(buf, O_RDWR|O_CREAT|O_NOFOLLOW, 0661)) < 0) err(1, "cannot open %s", buf); if (flock(fd, LOCK_EX)) err(1, "cannot lock %s", buf); PRIV_END; n = 0; if ((len = read(fd, buf, sizeof(buf))) > 0) { for (cp = buf; len--; ) { if (*cp < '0' || *cp > '9') break; n = n * 10 + (*cp++ - '0'); } } do { tfname = lmktemp("tf", n); cfname = lmktemp("cf", n); dfname = lmktemp("df", n); n = (n + 1) % 1000; } while (stat(tfname, &stb) == 0 || stat(cfname, &stb) == 0 || stat(dfname, &stb) == 0); inchar = strlen(SD) + 3; (void)lseek(fd, (off_t)0, 0); snprintf(buf, sizeof(buf), "%03d\n", n); (void)write(fd, buf, strlen(buf)); (void)close(fd); /* unlocks as well */ } /* * Make a temp file name. */ static char * lmktemp(char *id, int num) { char *s; if (asprintf(&s, "%s/%sA%03d%s", SD, id, num, host) == -1) err(1, NULL); return(s); } static __dead void usage(void) { extern char *__progname; fprintf(stderr, "usage: %s [-cdfghlmnpqrstv] [-Pprinter] [-#num] [-C class] " "[-J job] [-T title]\n [-U user] [-i [numcols]] " "[-1234 font] [-wnum] [name ...]\n", __progname); exit(1); }