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  * $DragonFly: src/usr.bin/uuencode/uuencode.c,v 1.3 2004/12/24 15:13:56 liamfoy Exp $
  33  */
  34
  35 /*
  36  * uuencode [input] output
  37  *
  38  * Encode a file so it can be mailed to a remote system.
  39  */
  40 #include <sys/param.h>
  41 #include <sys/socket.h>
  42 #include <sys/stat.h>
  43
  44 #include <netinet/in.h>
  45
  46 #include <err.h>
  47 #include <libgen.h>
  48 #include <resolv.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53
  54 static void     encode(void);
  55 static void     base64_encode(void);
  56 static void     usage(void);
  57
  58 static FILE      *output;
  59 static int       mode;
  60 static char     **av;
  61
  62 int
  63 main(int argc, char *argv[])
  64 {
  65         struct stat sb;
  66         int base64;
  67         int ch;
  68         char *outfile;
  69
  70         base64 = 0;
  71         outfile = NULL;
  72
  73         if (strcmp(basename(argv[0]), "b64encode") == 0)
  74                 base64 = 1;
  75
  76         while ((ch = getopt(argc, argv, "mo:")) != -1) {
  77                 switch (ch) {
  78                 case 'm':
  79                         base64 = 1;
  80                         break;
  81                 case 'o':
  82                         outfile = optarg;
  83                         break;
  84                 case '?':
  85                 default:
  86                         usage();
  87                 }
  88         }
  89         argv += optind;
  90         argc -= optind;
  91
  92         switch(argc) {
  93         case 2:                 /* optional first argument is input file */
  94                 if (!freopen(*argv, "r", stdin) || fstat(fileno(stdin), &sb))
  95                         err(1, "%s", *argv);
  96 #define RWX     (S_IRWXU|S_IRWXG|S_IRWXO)
  97                 mode = sb.st_mode & RWX;
  98                 ++argv;
  99                 break;
 100         case 1:
 101 #define RW      (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
 102                 mode = RW & ~umask(RW);
 103                 break;
 104         case 0:
 105         default:
 106                 usage();
 107         }
 108
 109         av = argv;
 110
 111         if (outfile != NULL) {
 112                 output = fopen(outfile, "w+");
 113                 if (output == NULL)
 114                         err(1, "unable to open %s for output", outfile);
 115         } else
 116                 output = stdout;
 117         if (base64)
 118                 base64_encode();
 119         else
 120                 encode();
 121         if (ferror(output))
 122                 errx(1, "write error");
 123         exit(0);
 124 }
 125
 126 /* ENC is the basic 1 character encoding function to make a char printing */
 127 #define ENC(c) ((c) ? ((c) & 077) + ' ': '`')
 128
 129 /*
 130  * Copy from in to out, encoding in base64 as you go along.
 131  */
 132 static void
 133 base64_encode(void)
 134 {
 135         /*
 136          * Output must fit into 80 columns, chunks come in 4, leave 1.
 137          */
 138 #define GROUPS  ((80 / 4) - 1)
 139         unsigned char buf[3];
 140         char buf2[sizeof(buf) * 2 + 1];
 141         size_t n;
 142         int rv, sequence;
 143
 144         sequence = 0;
 145
 146         fprintf(output, "begin-base64 %o %s\n", mode, *av);
 147         while ((n = fread(buf, 1, sizeof(buf), stdin))) {
 148                 ++sequence;
 149                 rv = b64_ntop(buf, n, buf2, (sizeof(buf2) / sizeof(buf2[0])));
 150                 if (rv == -1)
 151                         errx(1, "b64_ntop: error encoding base64");
 152                 fprintf(output, "%s%s", buf2, (sequence % GROUPS) ? "" : "\n");
 153         }
 154         if (sequence % GROUPS)
 155                 fprintf(output, "\n");
 156         fprintf(output, "====\n");
 157 }
 158
 159 /*
 160  * Copy from in to out, encoding as you go along.
 161  */
 162 static void
 163 encode(void)
 164 {
 165         int ch, n;
 166         char *p;
 167         char buf[80];
 168
 169         (void)fprintf(output, "begin %o %s\n", mode, *av);
 170         while ((n = fread(buf, 1, 45, stdin))) {
 171                 ch = ENC(n);
 172                 if (fputc(ch, output) == EOF)
 173                         break;
 174                 for (p = buf; n > 0; n -= 3, p += 3) {
 175                         /* Pad with nulls if not a multiple of 3. */
 176                         if (n < 3) {
 177                                 p[2] = '\0';
 178                                 if (n < 2)
 179                                         p[1] = '\0';
 180                         }
 181                         ch = *p >> 2;
 182                         ch = ENC(ch);
 183                         if (fputc(ch, output) == EOF)
 184                                 break;
 185                         ch = ((*p << 4) & 060) | ((p[1] >> 4) & 017);
 186                         ch = ENC(ch);
 187                         if (fputc(ch, output) == EOF)
 188                                 break;
 189                         ch = ((p[1] << 2) & 074) | ((p[2] >> 6) & 03);
 190                         ch = ENC(ch);
 191                         if (fputc(ch, output) == EOF)
 192                                 break;
 193                         ch = p[2] & 077;
 194                         ch = ENC(ch);
 195                         if (fputc(ch, output) == EOF)
 196                                 break;
 197                 }
 198                 if (fputc('\n', output) == EOF)
 199                         break;
 200         }
 201         if (ferror(stdin))
 202                 errx(1, "read error");
 203         (void)fprintf(output, "%c\nend\n", ENC('\0'));
 204 }
 205
 206 static void
 207 usage(void)
 208 {
 209         (void)fprintf(stderr,
 210 "usage: uuencode [-m] [-o outfile] [infile] remotefile\n"
 211 "       b64encode [-o outfile] [infile] remotefile\n");
 212         exit(1);
 213 }