1 /* $OpenBSD: head.c,v 1.13 2023/03/08 04:43:11 guenther Exp $ */ 2 /* $NetBSD: head.c,v 1.6 1996/12/28 07:11:03 tls Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "rcv.h" 34 #include "extern.h" 35 36 /* 37 * Mail -- a mail program 38 * 39 * Routines for processing and detecting headlines. 40 */ 41 42 /* 43 * See if the passed line buffer is a mail header. 44 * Return true if yes. Note the extreme pains to 45 * accommodate all funny formats. 46 */ 47 int 48 ishead(char *linebuf) 49 { 50 char *cp; 51 struct headline hl; 52 char parbuf[BUFSIZ]; 53 54 cp = linebuf; 55 if (*cp++ != 'F' || *cp++ != 'r' || *cp++ != 'o' || *cp++ != 'm' || 56 *cp++ != ' ') 57 return(0); 58 parse(linebuf, &hl, parbuf); 59 if (hl.l_from == NULL || hl.l_date == NULL) { 60 fail(linebuf, "No from or date field"); 61 return(0); 62 } 63 if (!isdate(hl.l_date)) { 64 fail(linebuf, "Date field not legal date"); 65 return(0); 66 } 67 /* 68 * I guess we got it! 69 */ 70 return(1); 71 } 72 73 void 74 fail(char *linebuf, char *reason) 75 { 76 77 /* 78 if (value("debug") == NULL) 79 return; 80 fprintf(stderr, "\"%s\"\nnot a header because %s\n", linebuf, reason); 81 */ 82 } 83 84 /* 85 * Split a headline into its useful components. 86 * Copy the line into dynamic string space, then set 87 * pointers into the copied line in the passed headline 88 * structure. Actually, it scans. 89 */ 90 void 91 parse(char *line, struct headline *hl, char *pbuf) 92 { 93 char *cp, *sp; 94 char word[LINESIZE]; 95 96 hl->l_from = NULL; 97 hl->l_tty = NULL; 98 hl->l_date = NULL; 99 cp = line; 100 sp = pbuf; 101 /* 102 * Skip over "From" first. 103 */ 104 cp = nextword(cp, word); 105 cp = nextword(cp, word); 106 if (*word) 107 hl->l_from = copyin(word, &sp); 108 if (cp != NULL && strncmp(cp, "tty", 3) == 0) { 109 cp = nextword(cp, word); 110 hl->l_tty = copyin(word, &sp); 111 } 112 if (cp != NULL) 113 hl->l_date = copyin(cp, &sp); 114 } 115 116 /* 117 * Copy the string on the left into the string on the right 118 * and bump the right (reference) string pointer by the length. 119 * Thus, dynamically allocate space in the right string, copying 120 * the left string into it. 121 */ 122 char * 123 copyin(char *src, char **space) 124 { 125 char *cp, *top; 126 127 top = cp = *space; 128 while ((*cp++ = *src++) != '\0') 129 ; 130 *space = cp; 131 return(top); 132 } 133 134 /* 135 * Test to see if the passed string is a ctime(3) generated 136 * date string as documented in the manual. The template 137 * below is used as the criterion of correctness. 138 * Also, we check for a possible trailing time zone using 139 * the tmztype template. 140 */ 141 142 /* 143 * 'A' An upper case char 144 * 'a' A lower case char 145 * ' ' A space 146 * '0' A digit 147 * 'O' A digit or space 148 * 'p' A punctuation char 149 * 'P' A punctuation char or space 150 * ':' A colon 151 * 'N' A new line 152 */ 153 154 /* 155 * Yuck. If the mail file is created by Sys V (Solaris), 156 * there are no seconds in the time... 157 */ 158 159 /* 160 * If the mail is created by another program such as imapd, it might 161 * have timezone as <-|+>nnnn (-0800 for instance) at the end. 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 "" 172 }; 173 174 int 175 isdate(char *date) 176 { 177 int i; 178 179 for(i = 0; *date_formats[i]; 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 && *tp) 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 || *tp) 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 = (unsigned char)*wp++) && c != ' ' && c != '\t') { 255 *wbuf++ = c; 256 if (c == '"') { 257 while ((c = (unsigned char)*wp++) && 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 = (unsigned char)*wp++) 267 ; 268 if (c == 0) 269 return(NULL); 270 return(wp - 1); 271 } 272