1 /* 2 * Copyright (c) 1980, 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)head.c 8.2 (Berkeley) 4/20/95 30 * $FreeBSD: src/usr.bin/mail/head.c,v 1.1.1.1.14.5 2003/06/17 04:25:07 mikeh Exp $ 31 * $DragonFly: src/usr.bin/mail/head.c,v 1.5 2004/09/08 03:01:11 joerg Exp $ 32 */ 33 34 #include "rcv.h" 35 #include "extern.h" 36 37 /* 38 * Mail -- a mail program 39 * 40 * Routines for processing and detecting headlines. 41 */ 42 43 /* 44 * See if the passed line buffer is a mail header. 45 * Return true if yes. Note the extreme pains to 46 * accomodate all funny formats. 47 */ 48 int 49 ishead(char *linebuf) 50 { 51 struct headline hl; 52 char parbuf[BUFSIZ]; 53 54 if (strncmp(linebuf, "From ", 5) != 0) 55 return (0); 56 parse(linebuf, &hl, parbuf); 57 if (hl.l_date == NULL) { 58 fail(linebuf, "No date field"); 59 return (0); 60 } 61 if (!isdate(hl.l_date)) { 62 fail(linebuf, "Date field not legal date"); 63 return (0); 64 } 65 /* 66 * I guess we got it! 67 */ 68 return (1); 69 } 70 71 /*ARGSUSED*/ 72 void 73 fail(const char *linebuf, const char *reason) 74 { 75 /* 76 if (value("debug") == NULL) 77 return; 78 fprintf(stderr, "\"%s\"\nnot a header because %s\n", linebuf, reason); 79 */ 80 } 81 82 /* 83 * Split a headline into its useful components. 84 * Copy the line into dynamic string space, then set 85 * pointers into the copied line in the passed headline 86 * structure. Actually, it scans. 87 */ 88 void 89 parse(char *line, struct headline *hl, char *pbuf) 90 { 91 char *cp, *sp; 92 char word[LINESIZE]; 93 94 hl->l_from = NULL; 95 hl->l_tty = NULL; 96 hl->l_date = NULL; 97 cp = line; 98 sp = pbuf; 99 /* 100 * Skip over "From" first. 101 */ 102 cp = nextword(cp, word); 103 /* 104 * Check for missing return-path. 105 */ 106 if (isdate(cp)) { 107 hl->l_date = copyin(cp, &sp); 108 return; 109 } 110 cp = nextword(cp, word); 111 if (strlen(word) > 0) 112 hl->l_from = copyin(word, &sp); 113 if (cp != NULL && strncmp(cp, "tty", 3) == 0) { 114 cp = nextword(cp, word); 115 hl->l_tty = copyin(word, &sp); 116 } 117 if (cp != NULL) 118 hl->l_date = copyin(cp, &sp); 119 } 120 121 /* 122 * Copy the string on the left into the string on the right 123 * and bump the right (reference) string pointer by the length. 124 * Thus, dynamically allocate space in the right string, copying 125 * the left string into it. 126 */ 127 char * 128 copyin(char *src, char **space) 129 { 130 char *cp, *top; 131 132 top = cp = *space; 133 while ((*cp++ = *src++) != '\0') 134 ; 135 *space = cp; 136 return (top); 137 } 138 139 /* 140 * Test to see if the passed string is a ctime(3) generated 141 * date string as documented in the manual. The template 142 * below is used as the criterion of correctness. 143 * Also, we check for a possible trailing time zone using 144 * the tmztype template. 145 * 146 * If the mail file is created by Sys V (Solaris), there are 147 * no seconds in the time. If the mail is created by another 148 * program such as imapd, it might have timezone as 149 * <-|+>nnnn (-0800 for instance) at the end. 150 */ 151 152 /* 153 * 'A' An upper case char 154 * 'a' A lower case char 155 * ' ' A space 156 * '0' A digit 157 * 'O' A digit or space 158 * 'p' A punctuation char 159 * 'P' A punctuation char or space 160 * ':' A colon 161 * 'N' A new line 162 */ 163 164 static char *date_formats[] = { 165 "Aaa Aaa O0 00:00:00 0000", /* Mon Jan 01 23:59:59 2001 */ 166 "Aaa Aaa O0 00:00:00 AAA 0000", /* Mon Jan 01 23:59:59 PST 2001 */ 167 "Aaa Aaa O0 00:00:00 0000 p0000", /* Mon Jan 01 23:59:59 2001 -0800 */ 168 "Aaa Aaa O0 00:00 0000", /* Mon Jan 01 23:59 2001 */ 169 "Aaa Aaa O0 00:00 AAA 0000", /* Mon Jan 01 23:59 PST 2001 */ 170 "Aaa Aaa O0 00:00 0000 p0000", /* Mon Jan 01 23:59 2001 -0800 */ 171 NULL 172 }; 173 174 int 175 isdate(char *date) 176 { 177 int i; 178 179 for(i = 0; date_formats[i] != NULL; i++) { 180 if (cmatch(date, date_formats[i])) 181 return (1); 182 } 183 return (0); 184 } 185 186 /* 187 * Match the given string (cp) against the given template (tp). 188 * Return 1 if they match, 0 if they don't 189 */ 190 int 191 cmatch(char *cp, char *tp) 192 { 193 194 while (*cp != '\0' && *tp != '\0') 195 switch (*tp++) { 196 case 'a': 197 if (!islower((unsigned char)*cp++)) 198 return (0); 199 break; 200 case 'A': 201 if (!isupper((unsigned char)*cp++)) 202 return (0); 203 break; 204 case ' ': 205 if (*cp++ != ' ') 206 return (0); 207 break; 208 case '0': 209 if (!isdigit((unsigned char)*cp++)) 210 return (0); 211 break; 212 case 'O': 213 if (*cp != ' ' && !isdigit((unsigned char)*cp)) 214 return (0); 215 cp++; 216 break; 217 case 'p': 218 if (!ispunct((unsigned char)*cp++)) 219 return (0); 220 break; 221 case 'P': 222 if (*cp != ' ' && !ispunct((unsigned char)*cp)) 223 return (0); 224 cp++; 225 break; 226 case ':': 227 if (*cp++ != ':') 228 return (0); 229 break; 230 case 'N': 231 if (*cp++ != '\n') 232 return (0); 233 break; 234 } 235 if (*cp != '\0' || *tp != '\0') 236 return (0); 237 return (1); 238 } 239 240 /* 241 * Collect a liberal (space, tab delimited) word into the word buffer 242 * passed. Also, return a pointer to the next word following that, 243 * or NULL if none follow. 244 */ 245 char * 246 nextword(char *wp, char *wbuf) 247 { 248 int c; 249 250 if (wp == NULL) { 251 *wbuf = '\0'; 252 return (NULL); 253 } 254 while ((c = *wp++) != '\0' && c != ' ' && c != '\t') { 255 *wbuf++ = c; 256 if (c == '"') { 257 while ((c = *wp++) != '\0' && c != '"') 258 *wbuf++ = c; 259 if (c == '"') 260 *wbuf++ = c; 261 else 262 wp--; 263 } 264 } 265 *wbuf = '\0'; 266 for (; c == ' ' || c == '\t'; c = *wp++) 267 ; 268 if (c == '\0') 269 return (NULL); 270 return (wp - 1); 271 } 272