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 41 #include <netinet/in.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <libgen.h> 46 #include <resolv.h> 47 #include <stdio.h> 48 #include <stdbool.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 extern int main_encode(int, char *[]); 54 extern int main_base64_encode(const char *, const char *); 55 56 static void encode(void); 57 static void base64_encode(void); 58 static int arg_to_col(const char *); 59 static void usage(void) __dead2; 60 61 static FILE *output; 62 static int mode; 63 static bool raw; 64 static char **av; 65 static int columns = 76; 66 67 int 68 main_base64_encode(const char *in, const char *w) 69 { 70 raw = 1; 71 if (in != NULL && freopen(in, "r", stdin) == NULL) 72 err(1, "%s", in); 73 output = stdout; 74 if (w != NULL) 75 columns = arg_to_col(w); 76 base64_encode(); 77 if (ferror(output)) 78 errx(1, "write error"); 79 exit(0); 80 } 81 82 int 83 main_encode(int argc, char *argv[]) 84 { 85 struct stat sb; 86 bool base64; 87 int ch; 88 const char *outfile; 89 90 base64 = false; 91 outfile = NULL; 92 93 if (strcmp(basename(argv[0]), "b64encode") == 0) 94 base64 = 1; 95 96 while ((ch = getopt(argc, argv, "mo:rw:")) != -1) { 97 switch (ch) { 98 case 'm': 99 base64 = true; 100 break; 101 case 'o': 102 outfile = optarg; 103 break; 104 case 'r': 105 raw = true; 106 break; 107 case 'w': 108 columns = arg_to_col(optarg); 109 break; 110 case '?': 111 default: 112 usage(); 113 } 114 } 115 argv += optind; 116 argc -= optind; 117 118 switch (argc) { 119 case 2: /* optional first argument is input file */ 120 if (!freopen(*argv, "r", stdin) || fstat(fileno(stdin), &sb)) 121 err(1, "%s", *argv); 122 #define RWX (S_IRWXU|S_IRWXG|S_IRWXO) 123 mode = sb.st_mode & RWX; 124 ++argv; 125 break; 126 case 1: 127 #define RW (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) 128 mode = RW & ~umask(RW); 129 break; 130 case 0: 131 default: 132 usage(); 133 } 134 135 av = argv; 136 137 if (outfile != NULL) { 138 output = fopen(outfile, "w+"); 139 if (output == NULL) 140 err(1, "unable to open %s for output", outfile); 141 } else 142 output = stdout; 143 if (base64) 144 base64_encode(); 145 else 146 encode(); 147 if (ferror(output)) 148 errx(1, "write error"); 149 exit(0); 150 } 151 152 /* ENC is the basic 1 character encoding function to make a char printing */ 153 #define ENC(c) ((c) ? ((c) & 077) + ' ': '`') 154 155 /* 156 * Copy from in to out, encoding in base64 as you go along. 157 */ 158 static void 159 base64_encode(void) 160 { 161 /* 162 * This buffer's length should be a multiple of 24 bits to avoid "=" 163 * padding. Once it reached ~1 KB, further expansion didn't improve 164 * performance for me. 165 */ 166 unsigned char buf[1023]; 167 char buf2[sizeof(buf) * 2 + 1]; 168 size_t n; 169 unsigned carry = 0; 170 int rv, written; 171 172 if (!raw) 173 fprintf(output, "begin-base64 %o %s\n", mode, *av); 174 while ((n = fread(buf, 1, sizeof(buf), stdin))) { 175 rv = b64_ntop(buf, n, buf2, nitems(buf2)); 176 if (rv == -1) 177 errx(1, "b64_ntop: error encoding base64"); 178 if (columns == 0) { 179 fputs(buf2, output); 180 continue; 181 } 182 for (int i = 0; i < rv; i += written) { 183 written = fprintf(output, "%.*s", columns - carry, 184 &buf2[i]); 185 186 carry = (carry + written) % columns; 187 if (carry == 0) 188 fputc('\n', output); 189 } 190 } 191 if (columns == 0 || carry != 0) 192 fputc('\n', output); 193 if (!raw) 194 fprintf(output, "====\n"); 195 } 196 197 /* 198 * Copy from in to out, encoding as you go along. 199 */ 200 static void 201 encode(void) 202 { 203 int ch, n; 204 char *p; 205 char buf[80]; 206 207 if (!raw) 208 (void)fprintf(output, "begin %o %s\n", mode, *av); 209 while ((n = fread(buf, 1, 45, stdin))) { 210 ch = ENC(n); 211 if (fputc(ch, output) == EOF) 212 break; 213 for (p = buf; n > 0; n -= 3, p += 3) { 214 /* Pad with nulls if not a multiple of 3. */ 215 if (n < 3) { 216 p[2] = '\0'; 217 if (n < 2) 218 p[1] = '\0'; 219 } 220 ch = *p >> 2; 221 ch = ENC(ch); 222 if (fputc(ch, output) == EOF) 223 break; 224 ch = ((*p << 4) & 060) | ((p[1] >> 4) & 017); 225 ch = ENC(ch); 226 if (fputc(ch, output) == EOF) 227 break; 228 ch = ((p[1] << 2) & 074) | ((p[2] >> 6) & 03); 229 ch = ENC(ch); 230 if (fputc(ch, output) == EOF) 231 break; 232 ch = p[2] & 077; 233 ch = ENC(ch); 234 if (fputc(ch, output) == EOF) 235 break; 236 } 237 if (fputc('\n', output) == EOF) 238 break; 239 } 240 if (ferror(stdin)) 241 errx(1, "read error"); 242 if (!raw) 243 (void)fprintf(output, "%c\nend\n", ENC('\0')); 244 } 245 246 static int 247 arg_to_col(const char *w) 248 { 249 char *ep; 250 long option; 251 252 errno = 0; 253 option = strtol(w, &ep, 10); 254 if (option > INT_MAX) 255 errno = ERANGE; 256 else if (ep[0] != '\0') 257 errno = EINVAL; 258 if (errno != 0) 259 err(2, NULL); 260 261 if (option < 0) { 262 errno = EINVAL; 263 err(2, "columns argument must be non-negative"); 264 } 265 return (option); 266 } 267 268 static void 269 usage(void) 270 { 271 (void)fprintf(stderr, 272 "usage: uuencode [-m] [-o outfile] [infile] remotefile\n" 273 " b64encode [-o outfile] [infile] remotefile\n"); 274 exit(1); 275 } 276