1 /*- 2 * Copyright (c) 2015 Baptiste Daroussin <bapt@FreeBSD.org> 3 * Copyright (c) 2015 Xin LI <delphij@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/capsicum.h> 32 #include <sys/types.h> 33 #include <sys/sbuf.h> 34 35 #include <capsicum_helpers.h> 36 #include <ctype.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <stdbool.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 #include <xlocale.h> 44 45 typedef enum { 46 /* state condition to transit to next state */ 47 INIT, /* '$' */ 48 DELIM_SEEN, /* letter */ 49 KEYWORD, /* punctuation mark */ 50 PUNC_SEEN, /* ':' -> _SVN; space -> TEXT */ 51 PUNC_SEEN_SVN, /* space */ 52 TEXT 53 } analyzer_states; 54 55 static int 56 scan(FILE *fp, const char *name, bool quiet) 57 { 58 int c; 59 bool hasid = false; 60 bool subversion = false; 61 analyzer_states state = INIT; 62 struct sbuf *id = sbuf_new_auto(); 63 locale_t l; 64 65 l = newlocale(LC_ALL_MASK, "C", NULL); 66 67 if (name != NULL) 68 printf("%s:\n", name); 69 70 while ((c = fgetc(fp)) != EOF) { 71 switch (state) { 72 case INIT: 73 if (c == '$') { 74 /* Transit to DELIM_SEEN if we see $ */ 75 state = DELIM_SEEN; 76 } else { 77 /* Otherwise, stay in INIT state */ 78 continue; 79 } 80 break; 81 case DELIM_SEEN: 82 if (isalpha_l(c, l)) { 83 /* Transit to KEYWORD if we see letter */ 84 sbuf_clear(id); 85 sbuf_putc(id, '$'); 86 sbuf_putc(id, c); 87 state = KEYWORD; 88 89 continue; 90 } else if (c == '$') { 91 /* Or, stay in DELIM_SEEN if more $ */ 92 continue; 93 } else { 94 /* Otherwise, transit back to INIT */ 95 state = INIT; 96 } 97 break; 98 case KEYWORD: 99 sbuf_putc(id, c); 100 101 if (isalpha_l(c, l)) { 102 /* 103 * Stay in KEYWORD if additional letter is seen 104 */ 105 continue; 106 } else if (c == ':') { 107 /* 108 * See ':' for the first time, transit to 109 * PUNC_SEEN. 110 */ 111 state = PUNC_SEEN; 112 subversion = false; 113 } else if (c == '$') { 114 /* 115 * Incomplete ident. Go back to DELIM_SEEN 116 * state because we see a '$' which could be 117 * the beginning of a keyword. 118 */ 119 state = DELIM_SEEN; 120 } else { 121 /* 122 * Go back to INIT state otherwise. 123 */ 124 state = INIT; 125 } 126 break; 127 case PUNC_SEEN: 128 case PUNC_SEEN_SVN: 129 sbuf_putc(id, c); 130 131 switch (c) { 132 case ':': 133 /* 134 * If we see '::' (seen : in PUNC_SEEN), 135 * activate subversion treatment and transit 136 * to PUNC_SEEN_SVN state. 137 * 138 * If more than two :'s were seen, the ident 139 * is invalid and we would therefore go back 140 * to INIT state. 141 */ 142 if (state == PUNC_SEEN) { 143 state = PUNC_SEEN_SVN; 144 subversion = true; 145 } else { 146 state = INIT; 147 } 148 break; 149 case ' ': 150 /* 151 * A space after ':' or '::' indicates we are at the 152 * last component of potential ident. 153 */ 154 state = TEXT; 155 break; 156 default: 157 /* All other characters are invalid */ 158 state = INIT; 159 break; 160 } 161 break; 162 case TEXT: 163 sbuf_putc(id, c); 164 165 if (iscntrl_l(c, l)) { 166 /* Control characters are not allowed in this state */ 167 state = INIT; 168 } else if (c == '$') { 169 sbuf_finish(id); 170 /* 171 * valid ident should end with a space. 172 * 173 * subversion extension uses '#' to indicate that 174 * the keyword expansion have exceeded the fixed 175 * width, so it is also permitted if we are in 176 * subversion mode. No length check is enforced 177 * because GNU RCS ident(1) does not do it either. 178 */ 179 c = sbuf_data(id)[sbuf_len(id) - 2]; 180 if (c == ' ' || (subversion && c == '#')) { 181 printf(" %s\n", sbuf_data(id)); 182 hasid = true; 183 } 184 state = INIT; 185 } 186 /* Other characters: stay in the state */ 187 break; 188 } 189 } 190 sbuf_delete(id); 191 freelocale(l); 192 193 if (!hasid) { 194 if (!quiet) 195 fprintf(stderr, "%s warning: no id keywords in %s\n", 196 getprogname(), name ? name : "standard input"); 197 198 return (EXIT_FAILURE); 199 } 200 201 return (EXIT_SUCCESS); 202 } 203 204 int 205 main(int argc, char **argv) 206 { 207 bool quiet = false; 208 int ch, i, *fds, fd; 209 int ret = EXIT_SUCCESS; 210 size_t nfds; 211 FILE *fp; 212 213 while ((ch = getopt(argc, argv, "qV")) != -1) { 214 switch (ch) { 215 case 'q': 216 quiet = true; 217 break; 218 case 'V': 219 /* Do nothing, compat with GNU rcs's ident */ 220 return (EXIT_SUCCESS); 221 default: 222 errx(EXIT_FAILURE, "usage: %s [-q] [-V] [file...]", 223 getprogname()); 224 } 225 } 226 227 argc -= optind; 228 argv += optind; 229 230 if (caph_limit_stdio() < 0) 231 err(EXIT_FAILURE, "unable to limit stdio"); 232 233 if (argc == 0) { 234 nfds = 1; 235 fds = malloc(sizeof(*fds)); 236 if (fds == NULL) 237 err(EXIT_FAILURE, "unable to allocate fds array"); 238 fds[0] = STDIN_FILENO; 239 } else { 240 nfds = argc; 241 fds = malloc(sizeof(*fds) * nfds); 242 if (fds == NULL) 243 err(EXIT_FAILURE, "unable to allocate fds array"); 244 245 for (i = 0; i < argc; i++) { 246 fds[i] = fd = open(argv[i], O_RDONLY); 247 if (fd < 0) { 248 warn("%s", argv[i]); 249 ret = EXIT_FAILURE; 250 continue; 251 } 252 if (caph_limit_stream(fd, CAPH_READ) < 0) 253 err(EXIT_FAILURE, 254 "unable to limit fcntls/rights for %s", 255 argv[i]); 256 } 257 } 258 259 /* Enter Capsicum sandbox. */ 260 if (cap_enter() < 0 && errno != ENOSYS) 261 err(EXIT_FAILURE, "unable to enter capability mode"); 262 263 for (i = 0; i < (int)nfds; i++) { 264 if (fds[i] < 0) 265 continue; 266 267 fp = fdopen(fds[i], "r"); 268 if (fp == NULL) { 269 warn("%s", argv[i]); 270 ret = EXIT_FAILURE; 271 continue; 272 } 273 if (scan(fp, argc == 0 ? NULL : argv[i], quiet) != EXIT_SUCCESS) 274 ret = EXIT_FAILURE; 275 fclose(fp); 276 } 277 278 return (ret); 279 } 280