bin/uuencode/uuencode.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * uuencode [input] output
  34  *
  35  * Encode a file so it can be mailed to a remote system.
  36  */
  37 #include <sys/param.h>
  38 #include <sys/socket.h>
  39 #include <sys/stat.h>
  40 #include <sys/sysmacros.h>
  41
  42 #include <netinet/in.h>
  43
  44 #include <err.h>
  45 #include <libgen.h>
  46 #include <resolv.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 #define nitems(x)       (sizeof((x)) / sizeof((x)[0]))
  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 raw = 0;
  61 static char **av;
  62
  63 int
  64 main(int argc, char *argv[])
  65 {
  66         struct stat sb;
  67         int base64;
  68         int ch;
  69         char *outfile;
  70
  71         base64 = 0;
  72         outfile = NULL;
  73
  74         if (strcmp(basename(argv[0]), "b64encode") == 0)
  75                 base64 = 1;
  76
  77         while ((ch = getopt(argc, argv, "mo:r")) != -1) {
  78                 switch (ch) {
  79                 case 'm':
  80                         base64 = 1;
  81                         break;
  82                 case 'o':
  83                         outfile = optarg;
  84                         break;
  85                 case 'r':
  86                         raw = 1;
  87                         break;
  88                 case '?':
  89                 default:
  90                         usage();
  91                 }
  92         }
  93         argv += optind;
  94         argc -= optind;
  95
  96         switch(argc) {
  97         case 2:                 /* optional first argument is input file */
  98                 if (!freopen(*argv, "r", stdin) || fstat(fileno(stdin), &sb))
  99                         err(1, "%s", *argv);
 100 #define RWX     (S_IRWXU|S_IRWXG|S_IRWXO)
 101                 mode = sb.st_mode & RWX;
 102                 ++argv;
 103                 break;
 104         case 1:
 105 #define RW      (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
 106                 mode = RW & ~umask(RW);
 107                 break;
 108         case 0:
 109         default:
 110                 usage();
 111         }
 112
 113         av = argv;
 114
 115         if (outfile != NULL) {
 116                 output = fopen(outfile, "w+");
 117                 if (output == NULL)
 118                         err(1, "unable to open %s for output", outfile);
 119         } else
 120                 output = stdout;
 121         if (base64)
 122                 base64_encode();
 123         else
 124                 encode();
 125         if (ferror(output))
 126                 errx(1, "write error");
 127         exit(0);
 128 }
 129
 130 /* ENC is the basic 1 character encoding function to make a char printing */
 131 #define ENC(c) ((c) ? ((c) & 077) + ' ': '`')
 132
 133 /*
 134  * Copy from in to out, encoding in base64 as you go along.
 135  */
 136 static void
 137 base64_encode(void)
 138 {
 139         /*
 140          * Output must fit into 80 columns, chunks come in 4, leave 1.
 141          */
 142 #define GROUPS  ((80 / 4) - 1)
 143         unsigned char buf[3];
 144         char buf2[sizeof(buf) * 2 + 1];
 145         size_t n;
 146         int rv, sequence;
 147
 148         sequence = 0;
 149
 150         if (!raw)
 151                 fprintf(output, "begin-base64 %o %s\n", mode, *av);
 152         while ((n = fread(buf, 1, sizeof(buf), stdin))) {
 153                 ++sequence;
 154                 rv = b64_ntop(buf, n, buf2, nitems(buf2));
 155                 if (rv == -1)
 156                         errx(1, "b64_ntop: error encoding base64");
 157                 fprintf(output, "%s%s", buf2, (sequence % GROUPS) ? "" : "\n");
 158         }
 159         if (sequence % GROUPS)
 160                 fprintf(output, "\n");
 161         if (!raw)
 162                 fprintf(output, "====\n");
 163 }
 164
 165 /*
 166  * Copy from in to out, encoding as you go along.
 167  */
 168 static void
 169 encode(void)
 170 {
 171         register int ch, n;
 172         register char *p;
 173         char buf[80];
 174
 175         if (!raw)
 176                 (void)fprintf(output, "begin %o %s\n", mode, *av);
 177         while ((n = fread(buf, 1, 45, stdin))) {
 178                 ch = ENC(n);
 179                 if (fputc(ch, output) == EOF)
 180                         break;
 181                 for (p = buf; n > 0; n -= 3, p += 3) {
 182                         /* Pad with nulls if not a multiple of 3. */
 183                         if (n < 3) {
 184                                 p[2] = '\0';
 185                                 if (n < 2)
 186                                         p[1] = '\0';
 187                         }
 188                         ch = *p >> 2;
 189                         ch = ENC(ch);
 190                         if (fputc(ch, output) == EOF)
 191                                 break;
 192                         ch = ((*p << 4) & 060) | ((p[1] >> 4) & 017);
 193                         ch = ENC(ch);
 194                         if (fputc(ch, output) == EOF)
 195                                 break;
 196                         ch = ((p[1] << 2) & 074) | ((p[2] >> 6) & 03);
 197                         ch = ENC(ch);
 198                         if (fputc(ch, output) == EOF)
 199                                 break;
 200                         ch = p[2] & 077;
 201                         ch = ENC(ch);
 202                         if (fputc(ch, output) == EOF)
 203                                 break;
 204                 }
 205                 if (fputc('\n', output) == EOF)
 206                         break;
 207         }
 208         if (ferror(stdin))
 209                 errx(1, "read error");
 210         if (!raw)
 211                 (void)fprintf(output, "%c\nend\n", ENC('\0'));
 212 }
 213
 214 static void
 215 usage(void)
 216 {
 217         (void)fprintf(stderr,
 218 "usage: uuencode [-m] [-o outfile] [infile] remotefile\n"
 219 "       b64encode [-o outfile] [infile] remotefile\n");
 220         exit(1);
 221 }