usr.bin/uuencode/uuencode.c

   1 /*-
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)uuencode.c       8.2 (Berkeley) 4/2/94
  31  * $FreeBSD: src/usr.bin/uuencode/uuencode.c,v 1.4.2.5 2002/10/21 11:52:15 fanf Exp $
  32  */
  33
  34 /*
  35  * uuencode [input] output
  36  *
  37  * Encode a file so it can be mailed to a remote system.
  38  */
  39 #include <sys/param.h>
  40 #include <sys/socket.h>
  41 #include <sys/stat.h>
  42
  43 #include <netinet/in.h>
  44
  45 #include <err.h>
  46 #include <libgen.h>
  47 #include <resolv.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 static void     encode(void);
  54 static void     base64_encode(void);
  55 static void     usage(void);
  56
  57 static FILE      *output;
  58 static int       mode;
  59 static char     **av;
  60
  61 int
  62 main(int argc, char *argv[])
  63 {
  64         struct stat sb;
  65         int base64;
  66         int ch;
  67         char *outfile;
  68
  69         base64 = 0;
  70         outfile = NULL;
  71
  72         if (strcmp(basename(argv[0]), "b64encode") == 0)
  73                 base64 = 1;
  74
  75         while ((ch = getopt(argc, argv, "mo:")) != -1) {
  76                 switch (ch) {
  77                 case 'm':
  78                         base64 = 1;
  79                         break;
  80                 case 'o':
  81                         outfile = optarg;
  82                         break;
  83                 case '?':
  84                 default:
  85                         usage();
  86                 }
  87         }
  88         argv += optind;
  89         argc -= optind;
  90
  91         switch(argc) {
  92         case 2:                 /* optional first argument is input file */
  93                 if (!freopen(*argv, "r", stdin) || fstat(fileno(stdin), &sb))
  94                         err(1, "%s", *argv);
  95 #define RWX     (S_IRWXU|S_IRWXG|S_IRWXO)
  96                 mode = sb.st_mode & RWX;
  97                 ++argv;
  98                 break;
  99         case 1:
 100 #define RW      (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
 101                 mode = RW & ~umask(RW);
 102                 break;
 103         case 0:
 104         default:
 105                 usage();
 106         }
 107
 108         av = argv;
 109
 110         if (outfile != NULL) {
 111                 output = fopen(outfile, "w+");
 112                 if (output == NULL)
 113                         err(1, "unable to open %s for output", outfile);
 114         } else
 115                 output = stdout;
 116         if (base64)
 117                 base64_encode();
 118         else
 119                 encode();
 120         if (ferror(output))
 121                 errx(1, "write error");
 122         exit(0);
 123 }
 124
 125 /* ENC is the basic 1 character encoding function to make a char printing */
 126 #define ENC(c) ((c) ? ((c) & 077) + ' ': '`')
 127
 128 /*
 129  * Copy from in to out, encoding in base64 as you go along.
 130  */
 131 static void
 132 base64_encode(void)
 133 {
 134         /*
 135          * Output must fit into 80 columns, chunks come in 4, leave 1.
 136          */
 137 #define GROUPS  ((80 / 4) - 1)
 138         unsigned char buf[3];
 139         char buf2[sizeof(buf) * 2 + 1];
 140         size_t n;
 141         int rv, sequence;
 142
 143         sequence = 0;
 144
 145         fprintf(output, "begin-base64 %o %s\n", mode, *av);
 146         while ((n = fread(buf, 1, sizeof(buf), stdin))) {
 147                 ++sequence;
 148                 rv = b64_ntop(buf, n, buf2, NELEM(buf2));
 149                 if (rv == -1)
 150                         errx(1, "b64_ntop: error encoding base64");
 151                 fprintf(output, "%s%s", buf2, (sequence % GROUPS) ? "" : "\n");
 152         }
 153         if (sequence % GROUPS)
 154                 fprintf(output, "\n");
 155         fprintf(output, "====\n");
 156 }
 157
 158 /*
 159  * Copy from in to out, encoding as you go along.
 160  */
 161 static void
 162 encode(void)
 163 {
 164         int ch, n;
 165         char *p;
 166         char buf[80];
 167
 168         (void)fprintf(output, "begin %o %s\n", mode, *av);
 169         while ((n = fread(buf, 1, 45, stdin))) {
 170                 ch = ENC(n);
 171                 if (fputc(ch, output) == EOF)
 172                         break;
 173                 for (p = buf; n > 0; n -= 3, p += 3) {
 174                         /* Pad with nulls if not a multiple of 3. */
 175                         if (n < 3) {
 176                                 p[2] = '\0';
 177                                 if (n < 2)
 178                                         p[1] = '\0';
 179                         }
 180                         ch = *p >> 2;
 181                         ch = ENC(ch);
 182                         if (fputc(ch, output) == EOF)
 183                                 break;
 184                         ch = ((*p << 4) & 060) | ((p[1] >> 4) & 017);
 185                         ch = ENC(ch);
 186                         if (fputc(ch, output) == EOF)
 187                                 break;
 188                         ch = ((p[1] << 2) & 074) | ((p[2] >> 6) & 03);
 189                         ch = ENC(ch);
 190                         if (fputc(ch, output) == EOF)
 191                                 break;
 192                         ch = p[2] & 077;
 193                         ch = ENC(ch);
 194                         if (fputc(ch, output) == EOF)
 195                                 break;
 196                 }
 197                 if (fputc('\n', output) == EOF)
 198                         break;
 199         }
 200         if (ferror(stdin))
 201                 errx(1, "read error");
 202         (void)fprintf(output, "%c\nend\n", ENC('\0'));
 203 }
 204
 205 static void
 206 usage(void)
 207 {
 208         (void)fprintf(stderr,
 209 "usage: uuencode [-m] [-o outfile] [infile] remotefile\n"
 210 "       b64encode [-o outfile] [infile] remotefile\n");
 211         exit(1);
 212 }