[unix-history] / usr / src / usr.bin / ftp / main.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)main.c      5.2 (Berkeley) %G%";
#endif not lint

/*
* FTP User Program -- Command Interface.
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/ioctl.h>

#include <arpa/ftp.h>

#include <signal.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <netdb.h>
#include <pwd.h>

#include "ftp_var.h"

int     intr();
int     lostpeer();
extern  char *home;

main(argc, argv)
       char *argv[];
{
       register char *cp;
       int top;
       struct passwd *pw;
       char homedir[MAXPATHLEN];

       sp = getservbyname("ftp", "tcp");
       if (sp == 0) {
               fprintf(stderr, "ftp: ftp/tcp: unknown service\n");
               exit(1);
       }
       doglob = 1;
       interactive = 1;
       autologin = 1;
       argc--, argv++;
       while (argc > 0 && **argv == '-') {
               for (cp = *argv + 1; *cp; cp++)
                       switch (*cp) {

                       case 'd':
                               options |= SO_DEBUG;
                               debug++;
                               break;
                       
                       case 'v':
                               verbose++;
                               break;

                       case 't':
                               trace++;
                               break;

                       case 'i':
                               interactive = 0;
                               break;

                       case 'n':
                               autologin = 0;
                               break;

                       case 'g':
                               doglob = 0;
                               break;

                       default:
                               fprintf(stderr,
                                 "ftp: %c: unknown option\n", *cp);
                               exit(1);
                       }
               argc--, argv++;
       }
       fromatty = isatty(fileno(stdin));
       /*
        * Set up defaults for FTP.
        */
       strcpy(typename, "ascii"), type = TYPE_A;
       strcpy(formname, "non-print"), form = FORM_N;
       strcpy(modename, "stream"), mode = MODE_S;
       strcpy(structname, "file"), stru = STRU_F;
       strcpy(bytename, "8"), bytesize = 8;
       if (fromatty)
               verbose++;
       /*
        * Set up the home directory in case we're globbing.
        */
       pw = getpwnam(getlogin());
       if (pw == NULL)
               pw = getpwuid(getuid());
       if (pw != NULL) {
               home = homedir;
               strcpy(home, pw->pw_dir);
       }
       if (argc > 0) {
               if (setjmp(toplevel))
                       exit(0);
               signal(SIGINT, intr);
               signal(SIGPIPE, lostpeer);
               setpeer(argc + 1, argv - 1);
       }
       top = setjmp(toplevel) == 0;
       if (top) {
               signal(SIGINT, intr);
               signal(SIGPIPE, lostpeer);
       }
       for (;;) {
               cmdscanner(top);
               top = 1;
       }
}

intr()
{

       longjmp(toplevel, 1);
}

lostpeer()
{
       extern FILE *cout;
       extern int data;

       if (connected) {
               if (cout != NULL) {
                       shutdown(fileno(cout), 1+1);
                       fclose(cout);
                       cout = NULL;
               }
               if (data >= 0) {
                       shutdown(data, 1+1);
                       (void) close(data);
                       data = -1;
               }
               connected = 0;
       }
       longjmp(toplevel, 1);
}

char *
tail(filename)
       char *filename;
{
       register char *s;
       
       while (*filename) {
               s = rindex(filename, '/');
               if (s == NULL)
                       break;
               if (s[1])
                       return (s + 1);
               *s = '\0';
       }
       return (filename);
}

/*
* Command parser.
*/
cmdscanner(top)
       int top;
{
       register struct cmd *c;
       struct cmd *getcmd();
       extern struct cmd cmdtab[];
       extern int help();

       if (!top)
               putchar('\n');
       for (;;) {
               if (fromatty) {
                       printf("ftp> ");
                       fflush(stdout);
               }
               if (gets(line) == 0) {
                       if (feof(stdin))
                               quit();
                       break;
               }
               if (line[0] == 0)
                       break;
               makeargv();
               c = getcmd(margv[0]);
               if (c == (struct cmd *)-1) {
                       printf("?Ambiguous command\n");
                       continue;
               }
               if (c == 0) {
                       printf("?Invalid command\n");
                       continue;
               }
               if (c->c_conn && !connected) {
                       printf ("Not connected.\n");
                       continue;
               }
               (*c->c_handler)(margc, margv);
               if (bell && c->c_bell)
                       putchar(CTRL(g));
               if (c->c_handler != help)
                       break;
       }
       longjmp(toplevel, 0);
}

struct cmd *
getcmd(name)
       register char *name;
{
       register char *p, *q;
       register struct cmd *c, *found;
       register int nmatches, longest;

       longest = 0;
       nmatches = 0;
       found = 0;
       for (c = cmdtab; p = c->c_name; c++) {
               for (q = name; *q == *p++; q++)
                       if (*q == 0)            /* exact match? */
                               return (c);
               if (!*q) {                      /* the name was a prefix */
                       if (q - name > longest) {
                               longest = q - name;
                               nmatches = 1;
                               found = c;
                       } else if (q - name == longest)
                               nmatches++;
               }
       }
       if (nmatches > 1)
               return ((struct cmd *)-1);
       return (found);
}

/*
* Slice a string up into argc/argv.
*/
makeargv()
{
       char **argp;
       char *slurpstring();

       margc = 0;
       argp = margv;
       stringbase = line;              /* scan from first of buffer */
       argbase = argbuf;               /* store from first of buffer */
       while (*argp++ = slurpstring())
               margc++;
}

/*
* Parse string into argbuf;
* implemented with FSM to
* handle quoting and strings
*/
char *
slurpstring()
{
       int got_one = 0;
       register char *sb = stringbase;
       register char *ap = argbase;
       char *tmp = argbase;            /* will return this if token found */

       if (*sb == '!') {               /* recognize ! as a token for shell */
               stringbase++;
               return ("!");
       }
S0:
       switch (*sb) {

       case '\0':
               goto OUT;

       case ' ':
       case '\t':
               sb++; goto S0;

       default:
               goto S1;
       }

S1:
       switch (*sb) {

       case ' ':
       case '\t':
       case '\0':
               goto OUT;       /* end of token */

       case '\\':
               sb++; goto S2;  /* slurp next character */

       case '"':
               sb++; goto S3;  /* slurp quoted string */

       default:
               *ap++ = *sb++;  /* add character to token */
               got_one = 1;
               goto S1;
       }

S2:
       switch (*sb) {

       case '\0':
               goto OUT;

       default:
               *ap++ = *sb++;
               got_one = 1;
               goto S1;
       }

S3:
       switch (*sb) {

       case '\0':
               goto OUT;

       case '"':
               sb++; goto S1;

       default:
               *ap++ = *sb++;
               got_one = 1;
               goto S3;
       }

OUT:
       if (got_one)
               *ap++ = '\0';
       argbase = ap;                   /* update storage pointer */
       stringbase = sb;                /* update scan pointer */
       if (got_one)
               return(tmp);
       return((char *)0);
}

#define HELPINDENT (sizeof ("directory"))

/*
* Help command.
* Call each command handler with argc == 0 and argv[0] == name.
*/
help(argc, argv)
       int argc;
       char *argv[];
{
       register struct cmd *c;

       if (argc == 1) {
               register int i, j, w;
               int columns, width = 0, lines;
               extern int NCMDS;

               printf("Commands may be abbreviated.  Commands are:\n\n");
               for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
                       int len = strlen(c->c_name);

                       if (len > width)
                               width = len;
               }
               width = (width + 8) &~ 7;
               columns = 80 / width;
               if (columns == 0)
                       columns = 1;
               lines = (NCMDS + columns - 1) / columns;
               for (i = 0; i < lines; i++) {
                       for (j = 0; j < columns; j++) {
                               c = cmdtab + j * lines + i;
                               printf("%s", c->c_name);
                               if (c + lines >= &cmdtab[NCMDS]) {
                                       printf("\n");
                                       break;
                               }
                               w = strlen(c->c_name);
                               while (w < width) {
                                       w = (w + 8) &~ 7;
                                       putchar('\t');
                               }
                       }
               }
               return;
       }
       while (--argc > 0) {
               register char *arg;
               arg = *++argv;
               c = getcmd(arg);
               if (c == (struct cmd *)-1)
                       printf("?Ambiguous help command %s\n", arg);
               else if (c == (struct cmd *)0)
                       printf("?Invalid help command %s\n", arg);
               else
                       printf("%-*s\t%s\n", HELPINDENT,
                               c->c_name, c->c_help);
       }
}

/*
* Call routine with argc, argv set from args (terminated by 0).
*/
/* VARARGS2 */
call(routine, args)
       int (*routine)();
       int args;
{
       register int *argp;
       register int argc;

       for (argc = 0, argp = &args; *argp++ != 0; argc++)
               ;
       (*routine)(argc, &args);
}