Initial lp.
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457
src/cmd/lp/lpdaemon.c
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457
src/cmd/lp/lpdaemon.c
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#include <u.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <signal.h>
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#include <errno.h>
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#include <time.h>
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#include <string.h>
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#include <stdarg.h>
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#include <libc.h>
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#undef ctime
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#undef wait
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/* for Plan 9 */
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#ifdef PLAN9
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#define LP "/bin/lp"
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#define TMPDIR "/var/tmp"
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#define LPDAEMONLOG unsharp("#9/lp/log/lpdaemonl")
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#endif
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/* for Tenth Edition systems */
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#ifdef V10
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#define LP "/usr/bin/lp"
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#define TMPDIR "/tmp"
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#define LPDAEMONLOG "/tmp/lpdaemonl"
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#endif
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/* for System V or BSD systems */
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#if defined(SYSV) || defined(BSD)
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#define LP "/v/bin/lp"
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#define TMPDIR "/tmp"
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#define LPDAEMONLOG "/tmp/lpdaemonl"
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#endif
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#define ARGSIZ 4096
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#define NAMELEN 30
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unsigned char argvstr[ARGSIZ]; /* arguments after parsing */
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unsigned char *argvals[ARGSIZ/2+1]; /* pointers to arguments after parsing */
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int ascnt = 0, argcnt = 0; /* number of arguments parsed */
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/* for 'stuff' gleened from lpr cntrl file */
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struct jobinfo {
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char user[NAMELEN+1];
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char host[NAMELEN+1];
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} *getjobinfo();
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#define MIN(a,b) ((a<b)?a:b)
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#define CPYFIELD(src, dst) { while (*(src)!=' ' && *(src)!='\t' && *(src)!='\r' && *(src)!='\n' && *(src)!='\0') *(dst)++ = *(src)++; }
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#define ACK() write(1, "", 1)
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#define NAK() write(1, "\001", 1)
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#define LNBFSZ 4096
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unsigned char lnbuf[LNBFSZ];
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#define RDSIZE 512
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unsigned char jobbuf[RDSIZE];
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int datafd[400], cntrlfd = -1;
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int dbgstate = 0;
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char *dbgstrings[] = {
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"",
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"sendack1",
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"send",
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"rcvack",
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"sendack2",
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"done"
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};
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void
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error(char *s1, ...)
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{
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FILE *fp;
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long thetime;
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char *chartime;
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va_list ap;
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char *args[8];
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int argno = 0;
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if((fp=fopen(LPDAEMONLOG, "a"))==NULL) {
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fprintf(stderr, "cannot open %s in append mode\n", LPDAEMONLOG);
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return;
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}
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time(&thetime);
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chartime = ctime(&thetime);
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fprintf(fp, "%.15s [%5.5d] ", &(chartime[4]), getpid());
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va_start(ap, s1);
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while((args[argno++] = va_arg(ap, char*)) && argno<8);
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va_end(ap);
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fprintf(fp, s1, args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7]);
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fflush(fp);
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fclose(fp);
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return;
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}
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void
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forklp(int inputfd)
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{
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int i, cpid;
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unsigned char *bp, *cp;
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unsigned char logent[LNBFSZ];
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/* log this call to lp */
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cp = logent;
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for (i=1; i<argcnt; i++) {
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bp = argvals[i];
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if (cp+strlen((const char *)bp)+1 < logent+LNBFSZ-1) {
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CPYFIELD(bp, cp);
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*cp++ = ' ';
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}
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}
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*--cp = '\n';
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*++cp = '\0';
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error(logent);
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switch((cpid=fork())){
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case -1:
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error("fork error\n");
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exit(2);
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case 0:
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if (inputfd != 0)
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dup2(inputfd, 0);
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dup2(1, 2);
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lseek(0, 0L, 0);
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execvp(LP, (char**)argvals);
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error("exec failed\n");
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exit(3);
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default:
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while(wait((int *)0) != cpid);
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}
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}
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int
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tempfile(void)
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{
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int tindx = 0;
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char tmpf[sizeof(TMPDIR)+64];
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int crtfd, tmpfd;
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sprintf(tmpf, "%s/lp%d.%d", TMPDIR, getpid(), tindx++);
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if((crtfd=creat(tmpf, 0666)) < 0) {
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error("cannot create temp file %s\n", tmpf);
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NAK();
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exit(3);
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}
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if((tmpfd=open(tmpf, 2)) < 0) {
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error("cannot open temp file %s\n", tmpf);
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NAK();
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exit(3);
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}
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close(crtfd);
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unlink(tmpf); /* comment out for debugging */
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return(tmpfd);
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}
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int
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readfile(int outfd, int bsize)
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{
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int rv;
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dbgstate = 1;
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alarm(60);
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ACK();
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dbgstate = 2;
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for(; bsize > 0; bsize -= rv) {
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alarm(60);
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if((rv=read(0, jobbuf, MIN(bsize,RDSIZE))) < 0) {
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error("error reading input, %d unread\n", bsize);
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exit(4);
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} else if (rv == 0) {
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error("connection closed prematurely\n");
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exit(4);
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} else if((write(outfd, jobbuf, rv)) != rv) {
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error("error writing temp file, %d unread\n", bsize);
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exit(5);
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}
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}
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dbgstate = 3;
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alarm(60);
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if (((rv=read(0, jobbuf, 1))==1) && (*jobbuf=='\0')) {
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alarm(60);
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ACK();
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dbgstate = 4;
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alarm(0);
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return(outfd);
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}
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alarm(0);
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error("received bad status <%d> from sender\n", *jobbuf);
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error("rv=%d\n", rv);
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NAK();
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return(-1);
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}
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/* reads a line from the input into lnbuf
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* if there is no error, it returns
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* the number of characters in the buffer
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* if there is an error and there where characters
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* read, it returns the negative value of the
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* number of characters read
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* if there is an error and no characters were read,
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* it returns the negative value of 1 greater than
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* the size of the line buffer
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*/
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int
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readline(int inpfd)
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{
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unsigned char *ap;
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int i, rv;
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ap = lnbuf;
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lnbuf[0] = '\0';
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i = 0;
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alarm(60);
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do {
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rv = read(inpfd, ap, 1);
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} while (rv==1 && ++i && *ap != '\n' && ap++ && (i < LNBFSZ - 2));
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alarm(0);
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if (i != 0 && *ap != '\n') {
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*++ap = '\n';
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i++;
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}
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*++ap = '\0';
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if (rv < 0) {
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error("read error; lost connection\n");
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if (i==0) i = -(LNBFSZ+1);
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else i = -i;
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}
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return(i);
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}
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int
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getfiles(void)
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{
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unsigned char *ap;
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int filecnt, bsize, rv;
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filecnt = 0;
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/* get a line, hopefully containing a ctrl char, size, and name */
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for(;;) {
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ap = lnbuf;
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if ((rv=readline(0)) < 0) NAK();
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if (rv <= 0) {
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return(filecnt);
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}
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switch(*ap++) {
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case '\1': /* cleanup - data sent was bad (whatever that means) */
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break;
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case '\2': /* read control file */
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bsize = atoi(ap);
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cntrlfd = tempfile();
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if (readfile(cntrlfd, bsize) < 0) {
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close(cntrlfd);
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NAK();
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return(0);
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}
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break;
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case '\3': /* read data file */
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bsize = atoi(ap);
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datafd[filecnt] = tempfile();
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if (readfile(datafd[filecnt], bsize) < 0) {
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close(datafd[filecnt]);
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NAK();
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return(0);
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}
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filecnt++;
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break;
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default:
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error("protocol error <%d>\n", *(ap-1));
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NAK();
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}
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}
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return(filecnt);
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}
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struct jobinfo *
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getjobinfo(int fd)
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{
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unsigned char *ap;
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int rv;
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static struct jobinfo info;
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if (fd < 0) error("getjobinfo: bad file descriptor\n");
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if (lseek(fd, 0L, 0) < 0) {
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error("error seeking in temp file\n");
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exit(7);
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}
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/* the following strings should be < NAMELEN or else they will not
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* be null terminated.
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*/
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strncpy(info.user, "daemon", NAMELEN);
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strncpy(info.host, "nowhere", NAMELEN);
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/* there may be a space after the name and host. It will be filtered out
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* by CPYFIELD.
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*/
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while ((rv=readline(fd)) > 0) {
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ap = lnbuf;
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ap[rv-1] = '\0'; /* remove newline from string */
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switch (*ap) {
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case 'H':
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if (ap[1] == '\0')
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strncpy(info.host, "unknown", NAMELEN);
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else
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strncpy(info.host, (const char *)&ap[1], NAMELEN);
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info.host[strlen(info.host)] = '\0';
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break;
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case 'P':
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if (ap[1] == '\0')
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strncpy(info.user, "unknown", NAMELEN);
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else
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strncpy(info.user, (const char *)&ap[1], NAMELEN);
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info.user[strlen(info.user)] = '\0';
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break;
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}
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}
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return(&info);
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}
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void
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alarmhandler(int sig) {
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signal(sig, alarmhandler);
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error("alarm at %d - %s\n", dbgstate, dbgstrings[dbgstate]);
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}
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void
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main(int argc, char **argv)
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{
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unsigned char *ap, *bp, *cp, *savbufpnt;
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int i, blen, rv, saveflg, savargcnt;
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struct jobinfo *jinfop;
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USED(argc);
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USED(argv);
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signal(SIGHUP, SIG_IGN);
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signal(SIGALRM, alarmhandler);
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cp = argvstr;
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/* setup argv[0] for exec */
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argvals[argcnt++] = cp;
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for (bp = (unsigned char *)LP, i = 0; (*bp != '\0') && (i < ARGSIZ-1); *cp++ = *bp++, i++);
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*cp++ = '\0';
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/* get the first line sent and parse it as arguments for lp */
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if ((rv=readline(0)) < 0)
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exit(1);
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bp = lnbuf;
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/* setup the remaining arguments */
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/* check for BSD style request */
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/* ^A, ^B, ^C, ^D, ^E (for BSD lpr) */
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switch (*bp) {
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case '\001':
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case '\003':
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case '\004':
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bp++; /* drop the ctrl character from the input */
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argvals[argcnt++] = cp;
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*cp++ = '-'; *cp++ = 'q'; *cp++ = '\0'; /* -q */
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argvals[argcnt++] = cp;
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*cp++ = '-'; *cp++ = 'd'; /* -d */
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CPYFIELD(bp, cp); /* printer */
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*cp++ = '\0';
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break;
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case '\002':
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bp++; /* drop the ctrl character from the input */
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argvals[argcnt++] = cp;
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*cp++ = '-'; *cp++ = 'd'; /* -d */
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CPYFIELD(bp, cp); /* printer */
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*cp++ = '\0';
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ACK();
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savargcnt = argcnt;
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savbufpnt = cp;
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while ((rv=getfiles())) {
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jinfop = getjobinfo(cntrlfd);
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close(cntrlfd);
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argcnt = savargcnt;
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cp = savbufpnt;
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argvals[argcnt++] = cp;
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*cp++ = '-'; *cp++ = 'M'; /* -M */
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bp = (unsigned char *)jinfop->host;
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CPYFIELD(bp, cp); /* host name */
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*cp++ = '\0';
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argvals[argcnt++] = cp;
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*cp++ = '-'; *cp++ = 'u'; /* -u */
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bp = (unsigned char *)jinfop->user;
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CPYFIELD(bp, cp); /* user name */
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*cp++ = '\0';
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for(i=0;i<rv;i++)
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forklp(datafd[i]);
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}
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exit(0);
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case '\005':
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bp++; /* drop the ctrl character from the input */
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argvals[argcnt++] = cp;
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*cp++ = '-'; *cp++ = 'k'; *cp++ = '\0'; /* -k */
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argvals[argcnt++] = cp;
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*cp++ = '-'; *cp++ = 'd'; /* -d */
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CPYFIELD(bp, cp); /* printer */
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*cp++ = '\0';
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argvals[argcnt++] = cp;
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*cp++ = '-'; ap = cp; *cp++ = 'u'; /* -u */
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CPYFIELD(bp, cp); /* username */
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/* deal with bug in lprng where the username is not supplied
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*/
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if (ap == (cp-1)) {
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ap = (unsigned char *)"none";
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CPYFIELD(ap, cp);
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}
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*cp++ = '\0';
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datafd[0] = tempfile();
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blen = strlen((const char *)bp);
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if (write(datafd[0], bp, blen) != blen) {
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error("write error\n");
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exit(6);
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}
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if (write(datafd[0], "\n", 1) != 1) {
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error("write error\n");
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exit(6);
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}
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break;
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default:
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/* otherwise get my lp arguments */
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do {
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/* move to next non-white space */
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while (*bp==' '||*bp=='\t')
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++bp;
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if (*bp=='\n') continue;
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/* only accept arguments beginning with -
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* this is done to prevent the printing of
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* local files from the destination host
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*/
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if (*bp=='-') {
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argvals[argcnt++] = cp;
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saveflg = 1;
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} else
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saveflg = 0;
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/* move to next white space copying text to argument buffer */
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while (*bp!=' ' && *bp!='\t' && *bp!='\n'
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&& *bp!='\0') {
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*cp = *bp++;
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cp += saveflg;
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}
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*cp = '\0';
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cp += saveflg;
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} while (*bp!='\n' && *bp!='\0');
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if (readline(0) < 0) exit(7);
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datafd[0] = tempfile();
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if(readfile(datafd[0], atoi((char *)lnbuf)) < 0) {
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error("readfile failed\n");
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exit(8);
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}
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}
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forklp(datafd[0]);
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exit(0);
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}
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