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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)uuencode.c       8.2 (Berkeley) 4/2/94
  35  * $FreeBSD: src/usr.bin/uuencode/uuencode.c,v 1.4.2.5 2002/10/21 11:52:15 fanf Exp $
  36  * $DragonFly: src/usr.bin/uuencode/uuencode.c,v 1.3 2004/12/24 15:13:56 liamfoy Exp $
  37  */
  38
  39 /*
  40  * uuencode [input] output
  41  *
  42  * Encode a file so it can be mailed to a remote system.
  43  */
  44 #include <sys/param.h>
  45 #include <sys/socket.h>
  46 #include <sys/stat.h>
  47
  48 #include <netinet/in.h>
  49
  50 #include <err.h>
  51 #include <libgen.h>
  52 #include <resolv.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <unistd.h>
  57
  58 static void     encode(void);
  59 static void     base64_encode(void);
  60 static void     usage(void);
  61
  62 static FILE      *output;
  63 static int       mode;
  64 static char     **av;
  65
  66 int
  67 main(int argc, char *argv[])
  68 {
  69         struct stat sb;
  70         int base64;
  71         int ch;
  72         char *outfile;
  73
  74         base64 = 0;
  75         outfile = NULL;
  76
  77         if (strcmp(basename(argv[0]), "b64encode") == 0)
  78                 base64 = 1;
  79
  80         while ((ch = getopt(argc, argv, "mo:")) != -1) {
  81                 switch (ch) {
  82                 case 'm':
  83                         base64 = 1;
  84                         break;
  85                 case 'o':
  86                         outfile = optarg;
  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         fprintf(output, "begin-base64 %o %s\n", mode, *av);
 151         while ((n = fread(buf, 1, sizeof(buf), stdin))) {
 152                 ++sequence;
 153                 rv = b64_ntop(buf, n, buf2, (sizeof(buf2) / sizeof(buf2[0])));
 154                 if (rv == -1)
 155                         errx(1, "b64_ntop: error encoding base64");
 156                 fprintf(output, "%s%s", buf2, (sequence % GROUPS) ? "" : "\n");
 157         }
 158         if (sequence % GROUPS)
 159                 fprintf(output, "\n");
 160         fprintf(output, "====\n");
 161 }
 162
 163 /*
 164  * Copy from in to out, encoding as you go along.
 165  */
 166 static void
 167 encode(void)
 168 {
 169         int ch, n;
 170         char *p;
 171         char buf[80];
 172
 173         (void)fprintf(output, "begin %o %s\n", mode, *av);
 174         while ((n = fread(buf, 1, 45, stdin))) {
 175                 ch = ENC(n);
 176                 if (fputc(ch, output) == EOF)
 177                         break;
 178                 for (p = buf; n > 0; n -= 3, p += 3) {
 179                         /* Pad with nulls if not a multiple of 3. */
 180                         if (n < 3) {
 181                                 p[2] = '\0';
 182                                 if (n < 2)
 183                                         p[1] = '\0';
 184                         }
 185                         ch = *p >> 2;
 186                         ch = ENC(ch);
 187                         if (fputc(ch, output) == EOF)
 188                                 break;
 189                         ch = ((*p << 4) & 060) | ((p[1] >> 4) & 017);
 190                         ch = ENC(ch);
 191                         if (fputc(ch, output) == EOF)
 192                                 break;
 193                         ch = ((p[1] << 2) & 074) | ((p[2] >> 6) & 03);
 194                         ch = ENC(ch);
 195                         if (fputc(ch, output) == EOF)
 196                                 break;
 197                         ch = p[2] & 077;
 198                         ch = ENC(ch);
 199                         if (fputc(ch, output) == EOF)
 200                                 break;
 201                 }
 202                 if (fputc('\n', output) == EOF)
 203                         break;
 204         }
 205         if (ferror(stdin))
 206                 errx(1, "read error");
 207         (void)fprintf(output, "%c\nend\n", ENC('\0'));
 208 }
 209
 210 static void
 211 usage(void)
 212 {
 213         (void)fprintf(stderr,
 214 "usage: uuencode [-m] [-o outfile] [infile] remotefile\n"
 215 "       b64encode [-o outfile] [infile] remotefile\n");
 216         exit(1);
 217 }