| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2005 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | |
| 21 | |
| 22 | #include <config.h> |
| 23 | #include "types.h" |
| 24 | |
| 25 | #include <string.h> |
| 26 | #include <ctype.h> |
| 27 | |
| 28 | #include <stdio.h> |
| 29 | |
| 30 | #include "mem.h" |
| 31 | #include "mime.h" |
| 32 | #include "vector.h" |
| 33 | #include "hex.h" |
| 34 | |
| 35 | static int whitespace(int c) { |
| 36 | switch(c) { |
| 37 | case ' ': |
| 38 | case '\t': |
| 39 | case '\r': |
| 40 | case '\n': |
| 41 | return 1; |
| 42 | default: |
| 43 | return 0; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | static int tspecial(int c) { |
| 48 | switch(c) { |
| 49 | case '(': |
| 50 | case ')': |
| 51 | case '<': |
| 52 | case '>': |
| 53 | case '@': |
| 54 | case ',': |
| 55 | case ';': |
| 56 | case ':': |
| 57 | case '\\': |
| 58 | case '"': |
| 59 | case '/': |
| 60 | case '[': |
| 61 | case ']': |
| 62 | case '?': |
| 63 | case '=': |
| 64 | return 1; |
| 65 | default: |
| 66 | return 0; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static const char *skipwhite(const char *s) { |
| 71 | int c, depth; |
| 72 | |
| 73 | for(;;) { |
| 74 | switch(c = *s) { |
| 75 | case ' ': |
| 76 | case '\t': |
| 77 | case '\r': |
| 78 | case '\n': |
| 79 | ++s; |
| 80 | break; |
| 81 | case '(': |
| 82 | ++s; |
| 83 | depth = 1; |
| 84 | while(*s && depth) { |
| 85 | c = *s++; |
| 86 | switch(c) { |
| 87 | case '(': ++depth; break; |
| 88 | case ')': --depth; break; |
| 89 | case '\\': |
| 90 | if(!*s) return 0; |
| 91 | ++s; |
| 92 | break; |
| 93 | } |
| 94 | } |
| 95 | if(depth) return 0; |
| 96 | break; |
| 97 | default: |
| 98 | return s; |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | static const char *parsestring(const char *s, char **valuep) { |
| 104 | struct dynstr value; |
| 105 | int c; |
| 106 | |
| 107 | dynstr_init(&value); |
| 108 | ++s; |
| 109 | while((c = *s++) != '"') { |
| 110 | switch(c) { |
| 111 | case '\\': |
| 112 | if(!(c = *s++)) return 0; |
| 113 | default: |
| 114 | dynstr_append(&value, c); |
| 115 | break; |
| 116 | } |
| 117 | } |
| 118 | if(!c) return 0; |
| 119 | dynstr_terminate(&value); |
| 120 | *valuep = value.vec; |
| 121 | return s; |
| 122 | } |
| 123 | |
| 124 | int mime_content_type(const char *s, |
| 125 | char **typep, |
| 126 | char **parameternamep, |
| 127 | char **parametervaluep) { |
| 128 | struct dynstr type, parametername, parametervalue; |
| 129 | |
| 130 | dynstr_init(&type); |
| 131 | if(!(s = skipwhite(s))) return -1; |
| 132 | if(!*s) return -1; |
| 133 | while(*s && !tspecial(*s) && !whitespace(*s)) |
| 134 | dynstr_append(&type, tolower((unsigned char)*s++)); |
| 135 | if(!(s = skipwhite(s))) return -1; |
| 136 | if(*s++ != '/') return -1; |
| 137 | dynstr_append(&type, '/'); |
| 138 | if(!(s = skipwhite(s))) return -1; |
| 139 | while(*s && !tspecial(*s) && !whitespace(*s)) |
| 140 | dynstr_append(&type, tolower((unsigned char)*s++)); |
| 141 | if(!(s = skipwhite(s))) return -1; |
| 142 | |
| 143 | if(*s == ';') { |
| 144 | dynstr_init(¶metername); |
| 145 | ++s; |
| 146 | if(!(s = skipwhite(s))) return -1; |
| 147 | if(!*s) return -1; |
| 148 | while(*s && !tspecial(*s) && !whitespace(*s)) |
| 149 | dynstr_append(¶metername, tolower((unsigned char)*s++)); |
| 150 | if(!(s = skipwhite(s))) return -1; |
| 151 | if(*s++ != '=') return -1; |
| 152 | if(!(s = skipwhite(s))) return -1; |
| 153 | if(*s == '"') { |
| 154 | if(!(s = parsestring(s, parametervaluep))) return -1; |
| 155 | } else { |
| 156 | dynstr_init(¶metervalue); |
| 157 | while(*s && !tspecial(*s) && !whitespace(*s)) |
| 158 | dynstr_append(¶metervalue, *s++); |
| 159 | dynstr_terminate(¶metervalue); |
| 160 | *parametervaluep = parametervalue.vec; |
| 161 | } |
| 162 | if(!(s = skipwhite(s))) return -1; |
| 163 | dynstr_terminate(¶metername); |
| 164 | *parameternamep = parametername.vec; |
| 165 | } else |
| 166 | *parametervaluep = *parameternamep = 0; |
| 167 | dynstr_terminate(&type); |
| 168 | *typep = type.vec; |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | static int iscrlf(const char *ptr) { |
| 173 | return ptr[0] == '\r' && ptr[1] == '\n'; |
| 174 | } |
| 175 | |
| 176 | const char *mime_parse(const char *s, |
| 177 | int (*callback)(const char *name, const char *value, |
| 178 | void *u), |
| 179 | void *u) { |
| 180 | struct dynstr name, value; |
| 181 | char *cte = 0, *p; |
| 182 | |
| 183 | while(*s && !iscrlf(s)) { |
| 184 | dynstr_init(&name); |
| 185 | dynstr_init(&value); |
| 186 | while(*s && !tspecial(*s) && !whitespace(*s)) |
| 187 | dynstr_append(&name, tolower((unsigned char)*s++)); |
| 188 | if(!(s = skipwhite(s))) return 0; |
| 189 | if(*s != ':') return 0; |
| 190 | ++s; |
| 191 | while(*s && !(*s == '\n' && !(s[1] == ' ' || s[1] == '\t'))) |
| 192 | dynstr_append(&value, *s++); |
| 193 | if(*s) ++s; |
| 194 | dynstr_terminate(&name); |
| 195 | dynstr_terminate(&value); |
| 196 | if(!strcmp(name.vec, "content-transfer-encoding")) { |
| 197 | cte = xstrdup(value.vec); |
| 198 | for(p = cte; *p; p++) |
| 199 | *p = tolower((unsigned char)*p); |
| 200 | } |
| 201 | if(callback(name.vec, value.vec, u)) return 0; |
| 202 | } |
| 203 | if(*s) s += 2; |
| 204 | if(cte) { |
| 205 | if(!strcmp(cte, "base64")) return mime_base64(s); |
| 206 | if(!strcmp(cte, "quoted-printable")) return mime_qp(s); |
| 207 | } |
| 208 | return s; |
| 209 | } |
| 210 | |
| 211 | static int isboundary(const char *ptr, const char *boundary, size_t bl) { |
| 212 | return (ptr[0] == '-' |
| 213 | && ptr[1] == '-' |
| 214 | && !strncmp(ptr + 2, boundary, bl) |
| 215 | && (iscrlf(ptr + bl + 2) |
| 216 | || (ptr[bl + 2] == '-' |
| 217 | && ptr[bl + 3] == '-' |
| 218 | && (iscrlf(ptr + bl + 4) || *(ptr + bl + 4) == 0)))); |
| 219 | } |
| 220 | |
| 221 | static int isfinal(const char *ptr, const char *boundary, size_t bl) { |
| 222 | return (ptr[0] == '-' |
| 223 | && ptr[1] == '-' |
| 224 | && !strncmp(ptr + 2, boundary, bl) |
| 225 | && ptr[bl + 2] == '-' |
| 226 | && ptr[bl + 3] == '-' |
| 227 | && (iscrlf(ptr + bl + 4) || *(ptr + bl + 4) == 0)); |
| 228 | } |
| 229 | |
| 230 | int mime_multipart(const char *s, |
| 231 | int (*callback)(const char *s, void *u), |
| 232 | const char *boundary, |
| 233 | void *u) { |
| 234 | size_t bl = strlen(boundary); |
| 235 | const char *start, *e; |
| 236 | int ret; |
| 237 | |
| 238 | /* We must start with a boundary string */ |
| 239 | if(!isboundary(s, boundary, bl)) |
| 240 | return -1; |
| 241 | /* Keep going until we hit a final boundary */ |
| 242 | while(!isfinal(s, boundary, bl)) { |
| 243 | s = strstr(s, "\r\n") + 2; |
| 244 | start = s; |
| 245 | while(!isboundary(s, boundary, bl)) { |
| 246 | if(!(e = strstr(s, "\r\n"))) |
| 247 | return -1; |
| 248 | s = e + 2; |
| 249 | } |
| 250 | if((ret = callback(xstrndup(start, |
| 251 | s == start ? 0 : s - start - 2), |
| 252 | u))) |
| 253 | return ret; |
| 254 | } |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | int mime_rfc2388_content_disposition(const char *s, |
| 259 | char **dispositionp, |
| 260 | char **parameternamep, |
| 261 | char **parametervaluep) { |
| 262 | struct dynstr disposition, parametername, parametervalue; |
| 263 | |
| 264 | dynstr_init(&disposition); |
| 265 | if(!(s = skipwhite(s))) return -1; |
| 266 | if(!*s) return -1; |
| 267 | while(*s && !tspecial(*s) && !whitespace(*s)) |
| 268 | dynstr_append(&disposition, tolower((unsigned char)*s++)); |
| 269 | if(!(s = skipwhite(s))) return -1; |
| 270 | |
| 271 | if(*s == ';') { |
| 272 | dynstr_init(¶metername); |
| 273 | ++s; |
| 274 | if(!(s = skipwhite(s))) return -1; |
| 275 | if(!*s) return -1; |
| 276 | while(*s && !tspecial(*s) && !whitespace(*s)) |
| 277 | dynstr_append(¶metername, tolower((unsigned char)*s++)); |
| 278 | if(!(s = skipwhite(s))) return -1; |
| 279 | if(*s++ != '=') return -1; |
| 280 | if(!(s = skipwhite(s))) return -1; |
| 281 | if(*s == '"') { |
| 282 | if(!(s = parsestring(s, parametervaluep))) return -1; |
| 283 | } else { |
| 284 | dynstr_init(¶metervalue); |
| 285 | while(*s && !tspecial(*s) && !whitespace(*s)) |
| 286 | dynstr_append(¶metervalue, *s++); |
| 287 | dynstr_terminate(¶metervalue); |
| 288 | *parametervaluep = parametervalue.vec; |
| 289 | } |
| 290 | if(!(s = skipwhite(s))) return -1; |
| 291 | dynstr_terminate(¶metername); |
| 292 | *parameternamep = parametername.vec; |
| 293 | } else |
| 294 | *parametervaluep = *parameternamep = 0; |
| 295 | dynstr_terminate(&disposition); |
| 296 | *dispositionp = disposition.vec; |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | char *mime_qp(const char *s) { |
| 301 | struct dynstr d; |
| 302 | int c, a, b; |
| 303 | const char *t; |
| 304 | |
| 305 | dynstr_init(&d); |
| 306 | while((c = *s++)) { |
| 307 | switch(c) { |
| 308 | case '=': |
| 309 | if((a = unhexdigitq(s[0])) != -1 |
| 310 | && (b = unhexdigitq(s[1])) != -1) { |
| 311 | dynstr_append(&d, a * 16 + b); |
| 312 | s += 2; |
| 313 | } else { |
| 314 | t = s; |
| 315 | while(*t == ' ' || *t == '\t') ++t; |
| 316 | if(iscrlf(t)) { |
| 317 | /* soft line break */ |
| 318 | s = t + 2; |
| 319 | } else |
| 320 | return 0; |
| 321 | } |
| 322 | break; |
| 323 | case ' ': |
| 324 | case '\t': |
| 325 | t = s; |
| 326 | while(*t == ' ' || *t == '\t') ++t; |
| 327 | if(iscrlf(t)) |
| 328 | /* trailing space is always eliminated */ |
| 329 | s = t; |
| 330 | else |
| 331 | dynstr_append(&d, c); |
| 332 | break; |
| 333 | default: |
| 334 | dynstr_append(&d, c); |
| 335 | break; |
| 336 | } |
| 337 | } |
| 338 | dynstr_terminate(&d); |
| 339 | return d.vec; |
| 340 | } |
| 341 | |
| 342 | char *mime_base64(const char *s) { |
| 343 | struct dynstr d; |
| 344 | const char *t; |
| 345 | int b[4], n, c; |
| 346 | static const char table[] = |
| 347 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| 348 | |
| 349 | dynstr_init(&d); |
| 350 | n = 0; |
| 351 | while((c = (unsigned char)*s++)) { |
| 352 | if((t = strchr(table, c))) { |
| 353 | b[n++] = t - table; |
| 354 | if(n == 4) { |
| 355 | dynstr_append(&d, (b[0] << 2) + (b[1] >> 4)); |
| 356 | dynstr_append(&d, (b[1] << 4) + (b[2] >> 2)); |
| 357 | dynstr_append(&d, (b[2] << 6) + b[3]); |
| 358 | n = 0; |
| 359 | } |
| 360 | } else if(c == '=') { |
| 361 | if(n >= 2) { |
| 362 | dynstr_append(&d, (b[0] << 2) + (b[1] >> 4)); |
| 363 | if(n == 3) |
| 364 | dynstr_append(&d, (b[1] << 4) + (b[2] >> 2)); |
| 365 | } |
| 366 | break; |
| 367 | } |
| 368 | } |
| 369 | dynstr_terminate(&d); |
| 370 | return d.vec; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | Local Variables: |
| 375 | c-basic-offset:2 |
| 376 | comment-column:40 |
| 377 | fill-column:79 |
| 378 | End: |
| 379 | */ |