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addr_util.c
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C/C++ Source or Header
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1991-11-26
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1,223 lines
static char rcsid[] = "@(#)$Id: addr_util.c,v 4.1.1.1 90/10/07 20:44:56 syd Exp $";
/*******************************************************************************
* The Elm Mail System - $Revision: 4.1.1.1 $ $State: Exp $
*
* Copyright (c) 1986, 1987 Dave Taylor
* Copyright (c) 1988, 1989, 1990 USENET Community Trust
*******************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
*
* Syd Weinstein, Elm Coordinator
* elm@DSI.COM dsinc!elm
*
*******************************************************************************
* $Log: addr_util.c,v $
* Revision 4.1.1.1 90/10/07 20:44:56 syd
* Make time to seconds
* From: rhg@cpscom
*
* Revision 4.1 90/04/28 22:42:21 syd
* checkin of Elm 2.3 as of Release PL0
*
*
******************************************************************************/
/** This file contains addressing utilities
**/
#include "headers.h"
#include <sys/types.h>
#include <sys/stat.h>
#ifdef PWDINSYS
# include <sys/pwd.h>
#else
# include <pwd.h>
#endif
#include <ctype.h>
#ifdef BSD
#undef tolower
#undef toupper
#endif
char *get_alias_address(), *get_token();
/* char *strtok(), *strcpy(), *strcat(), *strncpy(), *index(), *rindex(); */
#define SKIP_WS(p) while (isspace(*p)) p++
#define SKIP_ALPHA(p) while (isalpha(*p)) p++
#define SKIP_DIGITS(p) while (isdigit(*p)) p++
static char *day_name[8] = {
"sun", "mon", "tue", "wed", "thu", "fri", "sat", 0
};
static char *month_name[13] = {
"jan", "feb", "mar", "apr",
"may", "jun", "jul", "aug",
"sep", "oct", "nov", "dec", 0
};
static int month_len[12] = {
31, 28, 31, 30, 31, 30, 31,
31, 30, 31, 30, 31 };
/* The following time zones are taken from a variety of sources. They
* are by no means exhaustive, but seem to include most of those
* in common usage. A comprehensive list is impossible, since the same
* abbreviation is sometimes used to mean different things in different
* parts of the world.
*/
static struct tzone {
char *str;
int offset; /* offset, in minutes, EAST of GMT */
} tzone_info[] = {
/* the following are from rfc822 */
"ut", 0, "gmt", 0,
"est", -5*60, "edt", -4*60,
"cst", -6*60, "cdt", -5*60,
"mst", -7*60, "mdt", -6*60,
"pst", -8*60, "pdt", -7*60,
"z", 0, /* zulu time (the rest of the military codes are bogus) */
/* these are also popular in Europe */
"wet", 0*60, "wet dst", 1*60, /* western european */
"met", 1*60, "met dst", 2*60, /* middle european */
"eet", 2*60, "eet dst", 3*60, /* eastern european */
"bst", 1*60, /* ??? british summer time (=+0100) */
/* ... and Canada */
"ast", -4*60, "adt", -3*60, /* atlantic */
"nst", -3*60-30, "ndt", -2*60-30, /* newfoundland */
"yst", -9*60, "ydt", -8*60, /* yukon */
"hst", -10*60, /* hawaii (not really canada) */
/* ... and Asia */
"jst", 9*60, /* japan */
"sst", 8*60, /* singapore */
/* ... and the South Pacific */
"nzst", 12*60, "nzdt", 13*60, /* new zealand */
"wst", 8*60, "wdt", 9*60, /* western australia */
/* there's also central and eastern australia, but they insist on using
* cst, est, etc., which would be indistinguishable for the us zones */
(char *) 0, 0
};
char *
gcos_name(gcos_field, logname)
char *logname, *gcos_field;
{
/** Return the full name found in a passwd file gcos field **/
#ifdef BERKNAMES
static char fullname[SLEN];
register char *fncp, *gcoscp, *lncp, *end;
/* full name is all chars up to first ',' (or whole gcos, if no ',') */
/* replace any & with logname in upper case */
for(fncp = fullname, gcoscp= gcos_field, end = fullname + SLEN - 1;
(*gcoscp != ',' && *gcoscp != '\0' && fncp != end);
gcoscp++) {
if(*gcoscp == '&') {
for(lncp = logname; *lncp; fncp++, lncp++)
*fncp = toupper(*lncp);
} else {
*fncp++ = *gcoscp;
}
}
*fncp = '\0';
return(fullname);
#else
#ifdef USGNAMES
char *firstcp, *lastcp;
/* The last character of the full name is the one preceding the first
* '('. If there is no '(', then the full name ends at the end of the
* gcos field.
*/
if(lastcp = index(gcos_field, '('))
*lastcp = '\0';
/* The first character of the full name is the one following the
* last '-' before that ending character. NOTE: that's why we
* establish the ending character first!
* If there is no '-' before the ending character, then the fullname
* begins at the beginning of the gcos field.
*/
if(firstcp = rindex(gcos_field, '-'))
firstcp++;
else
firstcp = gcos_field;
return(firstcp);
#else
/* use full gcos field */
return(gcos_field);
#endif
#endif
}
char *
get_full_name(logname)
char *logname;
{
/* return a pointer to the full user name for the passed logname
* or NULL if cannot be found
* If PASSNAMES get it from the gcos field, otherwise get it
* from ~/.fullname.
*/
#ifndef PASSNAMES
FILE *fp;
char fullnamefile[SLEN];
#endif
static char fullname[SLEN];
struct passwd *getpwnam(), *pass;
if((pass = getpwnam(logname)) == NULL)
return(NULL);
#ifdef PASSNAMES /* get full_username from gcos field */
strcpy(fullname, gcos_name(pass->pw_gecos, logname));
#else /* get full_username from ~/.fullname file */
sprintf(fullnamefile, "%s/.fullname", pass->pw_dir);
if(can_access(fullnamefile, READ_ACCESS) != 0)
return(NULL); /* fullname file not accessible to user */
if((fp = fopen(fullnamefile, "r")) == NULL)
return(NULL); /* fullname file cannot be opened! */
if(fgets(fullname, SLEN, fp) == NULL) {
fclose(fp);
return(NULL); /* fullname file empty! */
}
fclose(fp);
no_ret(fullname); /* remove trailing '\n' */
#endif
return(fullname);
}
int
talk_to(sitename)
char *sitename;
{
/** If we talk to the specified site, return true, else
we're going to have to expand this baby out, so
return false! **/
struct lsys_rec *sysname;
sysname = talk_to_sys;
if (sysname == NULL) {
dprint(2, (debugfile,
"Warning: talk_to_sys is currently set to NULL!\n"));
return(0);
}
while (sysname != NULL) {
if (strcmp(sysname->name, sitename) == 0)
return(1);
else
sysname = sysname->next;
}
return(0);
}
add_site(buffer, site, lastsite)
char *buffer, *site, *lastsite;
{
/** add site to buffer, unless site is 'uucp' or site is
the same as lastsite. If not, set lastsite to site.
**/
char local_buffer[SLEN], *stripped;
char *strip_parens();
stripped = strip_parens(site);
if (strcmp(stripped, "uucp") != 0)
if (strcmp(stripped, lastsite) != 0) {
if (buffer[0] == '\0')
strcpy(buffer, stripped); /* first in list! */
else {
sprintf(local_buffer,"%s!%s", buffer, stripped);
strcpy(buffer, local_buffer);
}
strcpy(lastsite, stripped); /* don't want THIS twice! */
}
}
#ifdef USE_EMBEDDED_ADDRESSES
get_address_from(prefix, line, buffer)
char *prefix, *line, *buffer;
{
/** This routine extracts the address from either a 'From:' line
or a 'Reply-To:' line. The strategy is as follows: if the
line contains a '<', then the stuff enclosed is returned.
Otherwise we go through the line and strip out comments
and return that. White space will be elided from the result.
**/
register char *s;
/** Skip start of line over prefix, e.g. "From:". **/
line += strlen(prefix);
/** If there is a '<' then copy from it to '>' into the buffer. **/
if ( (s = index(line,'<')) != NULL ) {
while ( ++s , *s != '\0' && *s != '>' ) {
if ( !isspace(*s) )
*buffer++ = *s;
}
*buffer = '\0';
return;
}
/** Otherwise, strip comments and get address with whitespace elided. **/
for ( s = strip_parens(line) ; *s != '\0' ; ++s ) {
if ( !isspace(*s) )
*buffer++ = *s;
}
*buffer = '\0';
}
#endif
translate_return(addr, ret_addr)
char *addr, *ret_addr;
{
/** Return ret_addr to be the same as addr, but with the login
of the person sending the message replaced by '%s' for
future processing...
Fixed to make "%xx" "%%xx" (dumb 'C' system!)
**/
register int loc, loc2, iindex = 0;
loc2 = chloc(addr,'@');
if ((loc = chloc(addr, '%')) < loc2)
loc2 = loc;
if (loc2 != -1) { /* ARPA address. */
/* algorithm is to get to '@' sign and move backwards until
we've hit the beginning of the word or another metachar.
*/
for (loc = loc2 - 1; loc > -1 && addr[loc] != '!'; loc--)
;
}
else { /* usenet address */
/* simple algorithm - find last '!' */
loc2 = strlen(addr); /* need it anyway! */
for (loc = loc2; loc > -1 && addr[loc] != '!'; loc--)
;
}
/** now copy up to 'loc' into destination... **/
while (iindex <= loc) {
ret_addr[iindex] = addr[iindex];
iindex++;
}
/** now append the '%s'... **/
ret_addr[iindex++] = '%';
ret_addr[iindex++] = 's';
/** and, finally, if anything left, add that **/
loc = strlen(addr);
while (loc2 < loc) {
ret_addr[iindex++] = addr[loc2++];
if (addr[loc2-1] == '%') /* tweak for "printf" */
ret_addr[iindex++] = '%';
}
ret_addr[iindex] = '\0';
}
int
build_address(to, full_to)
char *to, *full_to;
{
/** loop on all words in 'to' line...append to full_to as
we go along, until done or length > len. Modified to
know that stuff in parens are comments...Returns non-zero
if it changed the information as it copied it across...
**/
register int i, j, changed = 0, in_parens = 0, expanded_information = 0;
char word[SLEN], next_word[SLEN], *ptr, buffer[SLEN];
char new_to_list[SLEN];
char *strpbrk(), *strcat(), *gecos;
#ifndef DONT_TOUCH_ADDRESSES
char *expand_system();
#endif
new_to_list[0] = '\0';
i = get_word(to, 0, word);
full_to[0] = '\0';
while (i > 0) {
j = get_word(to, i, next_word);
try_new_word:
if(word[0] == '(')
in_parens++;
if (in_parens) {
if(word[strlen(word)-1] == ')')
in_parens--;
strcat(full_to, " ");
strcat(full_to, word);
}
else if (strpbrk(word,"!@:") != NULL) {
#ifdef DONT_TOUCH_ADDRESSES
sprintf(full_to, "%s%s%s", full_to,
full_to[0] != '\0'? ", " : "", word);
#else
sprintf(full_to, "%s%s%s", full_to,
full_to[0] != '\0'? ", " : "", expand_system(word, 1));
#endif
}
else if ((ptr = get_alias_address(word, TRUE)) != NULL) {
sprintf(full_to, "%s%s%s", full_to,
full_to[0] != '\0'? ", " : "", ptr);
expanded_information++;
}
else if (strlen(word) > 0) {
if (valid_name(word)) {
if (j > 0 && next_word[0] == '(') /* already has full name */
gecos = NULL;
else /* needs a full name */
gecos=get_full_name(word);
#if defined(INTERNET) & defined(USE_DOMAIN)
sprintf(full_to, "%s%s%s@%s%s%s%s",
full_to,
(full_to[0] != '\0'? ", " : ""),
word,
hostfullname,
(gecos ? " (" : ""),
(gecos ? gecos : ""),
(gecos ? ")" : ""));
#else /* INTERNET and USE_DOMAIN */
sprintf(full_to, "%s%s%s%s%s%s",
full_to,
(full_to[0] != '\0'? ", " : ""),
word,
(gecos ? " (" : ""),
(gecos ? gecos : ""),
(gecos ? ")" : ""));
#endif /* INTERNET and USE_DOMAIN */
} else if (check_only) {
printf("(alias \"%s\" is unknown)\n\r", word);
changed++;
}
else if (! isatty(fileno(stdin)) ) { /* batch mode error! */
fprintf(stderr,"Cannot expand alias '%s'!\n\r", word);
fprintf(stderr,"Use \"checkalias\" to find valid addresses!\n\r");
dprint(1, (debugfile,
"Can't expand alias %s - bailing out of build_address\n",
word));
leave(0);
}
else {
dprint(2,(debugfile,"Entered unknown address %s\n", word));
sprintf(buffer, "'%s' is an unknown address. Replace with: ",
word);
word[0] = '\0';
changed++;
PutLine0(LINES, 0, buffer);
(void)optionally_enter(word, LINES, strlen(buffer), FALSE, FALSE);
clear_error();
if (strlen(word) > 0) {
dprint(3,(debugfile, "Replaced with %s in build_address\n",
word));
goto try_new_word;
}
else
dprint(3,(debugfile,
"Address removed from TO list by build_address\n"));
continue;
}
}
/* and this word to the new to list */
if(*new_to_list != '\0')
strcat(new_to_list, " ");
strcat(new_to_list, word);
if((i = j) > 0)
strcpy(word, next_word);
}
/* if new to list is different from original, update original */
if (changed)
strcpy(to, new_to_list);
return( expanded_information > 0 ? 1 : 0 );
}
int
real_from(buffer, entry)
char *buffer;
struct header_rec *entry;
{
/***** Returns true iff 's' has the seven 'from' fields, (or
8 - some machines include the TIME ZONE!!!)
Initialize the date and from entries in the record
and also the message received date/time if 'entry'
is not NULL. *****/
struct header_rec temp_rec, *rec_ptr;
char junk[STRING], timebuff[STRING], holding_from[SLEN], hold_tz[12];
char mybuf[BUFSIZ], *p, *q;
int eight_fields = 0;
int mday, month, year, minutes, seconds, tz, i;
long gmttime;
/* set rec_ptr according to whether the data is to be returned
* in the second argument */
rec_ptr = (entry == NULL ? &temp_rec : entry);
rec_ptr->year[0] = '\0';
timebuff[0] = '\0';
junk[0] = '\0';
hold_tz[0] = '\0';
/* From <user> <day> <month> <day> <hr:min:sec> <year> */
sscanf(buffer, "%*s %*s %*s %*s %*s %s %*s %s", timebuff, junk);
if (strlen(timebuff) < 3) {
dprint(3,(debugfile,
"Real_from returns FAIL [no time field] on\n-> %s\n",
buffer));
return(FALSE);
}
if (timebuff[1] != ':' && timebuff[2] != ':') {
dprint(3,(debugfile,
"Real_from returns FAIL [bad time field] on\n-> %s\n",
buffer));
return(FALSE);
}
if (junk[0] != '\0') { /* try for 8 field entry */
junk[0] = '\0';
sscanf(buffer, "%*s %*s %*s %*s %*s %s %*s %*s %s", timebuff, junk);
if (junk[0] != '\0') {
dprint(3, (debugfile,
"Real_from returns FAIL [too many fields] on\n-> %s\n",
buffer));
return(FALSE);
}
eight_fields++;
}
/** now get the info out of the record! **/
if (eight_fields)
sscanf(buffer, "%s %s %s %s %s %s %s %s",
junk, holding_from, rec_ptr->dayname, rec_ptr->month,
rec_ptr->day, rec_ptr->time, hold_tz, rec_ptr->year);
else
sscanf(buffer, "%s %s %s %s %s %s %s",
junk, holding_from, rec_ptr->dayname, rec_ptr->month,
rec_ptr->day, rec_ptr->time, rec_ptr->year);
strncpy(rec_ptr->from, holding_from, STRING-1);
rec_ptr->from[STRING-1] = '\0';
resolve_received(rec_ptr);
/* first get everything into lower case */
for (p=mybuf, q=mybuf+sizeof mybuf;
*buffer && p<q;
p++, buffer++) {
*p = isupper(*buffer) ? tolower(*buffer) : *buffer;
}
*p = 0;
p = mybuf;
while (!isspace(*p)) p++; /* skip "from" */
SKIP_WS(p);
while (!isspace(*p)) p++; /* skip from address */
SKIP_WS(p);
while (!isspace(*p)) p++; /* skip day of week */
SKIP_WS(p);
month = prefix(month_name, p);
get_unix_date(p,&year, &mday, &minutes, &seconds, &tz);
month_len[1] = (year%4) ? 28 : 29;
if (mday < 0 || mday>month_len[month]) {
dprint(5,(debugfile, "ridiculous day %d of month %d\n",mday,month));
}
minutes -= tz;
if (tz > 0) { /* east of Greenwich */
if (minutes < 0) {
if (--mday < 0) {
if (--month < 0) {
year--; /* don't worry about 1900! */
month = 11;
}
mday = month_len[month];
}
minutes += 24*60;
}
}
if (tz < 0) { /* west of Greenwich */
if (minutes <= 24*60) {
if (++mday > month_len[month]) {
if (++month >= 12) {
year++; /* don't worry about 1999! yet?? */
month = 0;
}
mday = 0;
}
minutes -= 24*60;
}
}
gmttime = year - 70; /* make base year */
if (gmttime < 0)
gmttime += 100;
gmttime = gmttime * 365 + (gmttime + 1) / 4; /* now we have days adjusted for leap years */
for (i = 0; i < month; i++)
gmttime += month_len[i];
if (month > 1 && (year % 4) == 0)
gmttime++; /* now to month adjusted for leap year if after feb */
gmttime += mday - 1; /* and now to the day */
gmttime *= 24 * 60; /* convert to minutes */
gmttime += minutes;
rec_ptr->time_sent = gmttime * 60 + seconds; /* now unix seconds since 1/1/70 00:00 GMT */
return(rec_ptr->year[0] != '\0');
}
forwarded(buffer, entry)
char *buffer;
struct header_rec *entry;
{
/** Change 'from' and date fields to reflect the ORIGINATOR of
the message by iteratively parsing the >From fields...
Modified to deal with headers that include the time zone
of the originating machine... **/
char machine[SLEN], buff[SLEN], holding_from[SLEN];
machine[0] = holding_from[0] = '\0';
sscanf(buffer, "%*s %s %s %s %s %s %s %*s %*s %s",
holding_from, entry->dayname, entry->month,
entry->day, entry->time, entry->year, machine);
if (isdigit(entry->month[0])) { /* try for veeger address */
sscanf(buffer, "%*s %s %s%*c %s %s %s %s %*s %*s %s",
holding_from, entry->dayname, entry->day, entry->month,
entry->year, entry->time, machine);
}
if (isalpha(entry->year[0])) { /* try for address including tz */
sscanf(buffer, "%*s %s %s %s %s %s %*s %s %*s %*s %s",
holding_from, entry->dayname, entry->month,
entry->day, entry->time, entry->year, machine);
}
/* the following fix is to deal with ">From xyz ... forwarded by xyz"
which occasionally shows up within AT&T. Thanks to Bill Carpenter
for the fix! */
if (strcmp(machine, holding_from) == 0)
machine[0] = '\0';
if (machine[0] == '\0')
strcpy(buff, holding_from[0] ? holding_from : "anonymous");
else
sprintf(buff,"%s!%s", machine, holding_from);
strncpy(entry->from, buff, STRING-1);
entry->from[STRING-1] = '\0';
}
parse_arpa_who(buffer, newfrom, is_really_a_to)
char *buffer, *newfrom;
int is_really_a_to;
{
/** try to parse the 'From:' line given... It can be in one of
two formats:
From: Dave Taylor <hplabs!dat>
or From: hplabs!dat (Dave Taylor)
Added: removes quotes if name is quoted (12/12)
Added: only copies STRING characters...
Added: if no comment part, copy address instead!
Added: if is_really_a_to, this is really a 'to' line
and treat as if we allow embedded addresses
**/
int use_embedded_addresses;
char temp_buffer[SLEN], *temp;
register int i, j = 0, in_parens;
temp = (char *) temp_buffer;
temp[0] = '\0';
no_ret(buffer); /* blow away '\n' char! */
if (lastch(buffer) == '>') {
for (i=strlen("From: "); buffer[i] != '\0' && buffer[i] != '<' &&
buffer[i] != '('; i++)
temp[j++] = buffer[i];
temp[j] = '\0';
}
else if (lastch(buffer) == ')') {
in_parens = 1;
for (i=strlen(buffer)-2; buffer[i] != '\0' && buffer[i] != '<'; i--) {
switch(buffer[i]) {
case ')': in_parens++;
break;
case '(': in_parens--;
break;
}
if(!in_parens) break;
temp[j++] = buffer[i];
}
temp[j] = '\0';
reverse(temp);
}
#ifdef USE_EMBEDDED_ADDRESSES
use_embedded_addresses = TRUE;
#else
use_embedded_addresses = FALSE;
#endif
if(use_embedded_addresses || is_really_a_to) {
/** if we have a null string at this point, we must just have a
From: line that contains an address only. At this point we
can have one of a few possibilities...
From: address
From: <address>
From: address ()
**/
if (strlen(temp) == 0) {
if (lastch(buffer) != '>') {
for (i=strlen("From:");buffer[i] != '\0' && buffer[i] != '('; i++)
temp[j++] = buffer[i];
temp[j] = '\0';
}
else { /* get outta '<>' pair, please! */
for (i=strlen(buffer)-2;buffer[i] != '<' && buffer[i] != ':';i--)
temp[j++] = buffer[i];
temp[j] = '\0';
reverse(temp);
}
}
}
if (strlen(temp) > 0) { /* mess with buffer... */
/* remove leading spaces and quotes... */
while (whitespace(temp[0]) || quote(temp[0]))
temp = (char *) (temp + 1); /* increment address! */
/* remove trailing spaces and quotes... */
i = strlen(temp) - 1;
while (whitespace(temp[i]) || quote(temp[i]))
temp[i--] = '\0';
/* if anything is left, let's change 'from' value! */
if (strlen(temp) > 0) {
strncpy(newfrom, temp, STRING-1);
newfrom[STRING-1] = '\0';
}
}
}
/*
Quoting from RFC 822:
5. DATE AND TIME SPECIFICATION
5.1. SYNTAX
date-time = [ day "," ] date time ; dd mm yy
; hh:mm:ss zzz
day = "Mon" / "Tue" / "Wed" / "Thu"
/ "Fri" / "Sat" / "Sun"
date = 1*2DIGIT month 2DIGIT ; day month year
; e.g. 20 Jun 82
month = "Jan" / "Feb" / "Mar" / "Apr"
/ "May" / "Jun" / "Jul" / "Aug"
/ "Sep" / "Oct" / "Nov" / "Dec"
time = hour zone ; ANSI and Military
hour = 2DIGIT ":" 2DIGIT [":" 2DIGIT]
; 00:00:00 - 23:59:59
zone = "UT" / "GMT" ; Universal Time
; North American : UT
/ "EST" / "EDT" ; Eastern: - 5/ - 4
/ "CST" / "CDT" ; Central: - 6/ - 5
/ "MST" / "MDT" ; Mountain: - 7/ - 6
/ "PST" / "PDT" ; Pacific: - 8/ - 7
/ 1ALPHA ; Military: Z = UT;
; A:-1; (J not used)
; M:-12; N:+1; Y:+12
/ ( ("+" / "-") 4DIGIT ) ; Local differential
; hours+min. (HHMM)
*/
/* Translate a symbolic timezone name (e.g. EDT or NZST) to a number of
* minutes *east* of gmt (if the local time is t, the gmt equivalent is
* t - tz_lookup(zone)).
* Return 0 if the timezone is not recognized.
*/
static int tz_lookup(str)
char *str;
{
struct tzone *p;
for (p = tzone_info; p->str; p++) {
if (strcmp(p->str,str)==0) return p->offset;
}
dprint(5,(debugfile,"unknown time zone %s\n",str));
return 0;
}
/* Return smallest i such that table[i] is a prefix of str. Return -1 if not
* found.
*/
static int prefix(table, str)
char **table;
char *str;
{
int i;
for (i=0;table[i];i++)
if (strncmp(table[i],str,strlen(*table))==0)
return i;
return -1;
}
/* The following routines, get_XXX(p,...), expect p to point to a string
* of the appropriate syntax. They return decoded values in result parameters,
* and return p updated to point past the parsed substring (also stripping
* trailing whitespace).
* Return 0 on syntax errors.
*/
/* Parse a year: ['1' '9'] digit digit WS
*/
static char *
get_year(p, result)
char *p;
int *result;
{
int year;
if (!isdigit(*p)) {
dprint(5,(debugfile,"missing year: %s\n",p));
return 0;
}
year = atoi(p);
/* be nice and allow 19xx, althought that's not really kosher */
if (year>=1900 && year <=1999) year -= 1900;
if (year<0 || year>99) {
dprint(5,(debugfile,"ridiculous year %d\n",year));
return 0;
}
SKIP_DIGITS(p);
SKIP_WS(p);
*result = year;
return p;
}
/* Parse a time: hours ':' minutes [ ':' seconds ] WS
* Check that 0<=hours<24, 0<=minutes,seconds<60.
* Also allow the syntax "digit digit digit digit" with implied ':' in the
* middle.
* Convert to minutes and seconds, with results in (*m,*s).
*/
static char *
get_time(p,m,s)
char *p;
int *m, *s;
{
int hours, minutes, seconds;
/* hour */
if (!isdigit(*p)) {
dprint(5,(debugfile,"missing time: %s\n",p));
return 0;
}
hours = atoi(p);
SKIP_DIGITS(p);
if (*p++ != ':') {
/* perhaps they just wrote hhmm instead of hh:mm */
minutes = hours % 60;
hours /= 60;
}
else {
if (hours<0 || hours>23) {
dprint(5,(debugfile,"ridiculous hour: %d\n",hours));
return 0;
}
minutes = atoi(p);
if (minutes<0 || minutes>59) {
dprint(5,(debugfile,"ridiculous minutes: %d\n",minutes));
return 0;
}
}
SKIP_DIGITS(p);
if (*p == ':') {
p++;
seconds = atoi(p);
if (seconds<0 || seconds>59) {
dprint(5,(debugfile,"ridiculous seconds: %d\n",seconds));
return 0;
}
SKIP_DIGITS(p);
}
else seconds = 0;
minutes += hours*60;
SKIP_WS(p);
*m = minutes;
*s = seconds;
return p;
}
/* Parse a Unix date from which the leading week-day has been stripped.
* The syntax is "Jun 21 06:45:44 CDT 1989" with timezone optional.
* i.e., month day time [ zone ] year
* where day::=digit*, year and time are as defined above,
* and month and zone are alpha strings starting with a known 3-char prefix.
* The month has already been processed by the caller, so we just skip over
* a leading alpha* WS.
*
* Unlike the preceding routines, the result is not an updated pointer, but
* simply 1 for success and 0 for failure.
*/
static int
get_unix_date(p,y,d,m,s,t)
char *p;
int *y, *d, *m, *s, *t;
{
SKIP_ALPHA(p);
SKIP_WS(p);
if (!isdigit(*p)) return 0;
*d = atoi(p); /* check the value for sanity after we know the month */
SKIP_DIGITS(p);
SKIP_WS(p);
p = get_time(p,m,s);
if (!p) return 0;
if (isalpha(*p)) {
*t = tz_lookup(p);
SKIP_ALPHA(p);
SKIP_WS(p);
}
else *t = 0;
p = get_year(p,y);
if (!p) return 0;
return 1;
}
/* Parse an rfc822 (with extensions) date. Return 1 on success, 0 on failure.
*/
parse_arpa_date(string, entry)
char *string;
struct header_rec *entry;
{
char buffer[BUFSIZ], *p, *q;
int mday, month, year, minutes, seconds, tz, i;
long gmttime;
/* first get everything into lower case */
for (p=buffer, q=buffer+sizeof buffer; *string && p<q; p++, string++) {
*p = isupper(*string) ? tolower(*string) : *string;
}
*p = 0;
p = buffer;
SKIP_WS(p);
if (prefix(day_name,p)>=0) {
/* accept anything that *starts* with a valid day name */
/* also, don't check whether it's right! */
(void)strncpy(entry->dayname, p, 3);
entry->dayname[3] = 0;
SKIP_ALPHA(p);
SKIP_WS(p);
if (*p==',') {
p++;
SKIP_WS(p);
}
/* A comma is required here, but we'll be nice guys and look the other
* way if it's missing.
*/
}
/* date */
/* day of the month */
if (!isdigit(*p)) {
/* Missing day. Maybe this is a Unix date?
*/
month = prefix(month_name,p);
if (month >= 0 &&
get_unix_date(p, &year, &mday, &minutes, &seconds, &tz)) {
goto got_date;
}
dprint(5,(debugfile,"missing day: %s\n",p));
return 0;
}
mday = atoi(p); /* check the value for sanity after we know the month */
SKIP_DIGITS(p);
SKIP_WS(p);
/* month name */
month = prefix(month_name,p);
if (month < 0) {
dprint(5,(debugfile,"missing month: %s\n",p));
return 0;
}
SKIP_ALPHA(p);
SKIP_WS(p);
/* year */
if (!(p = get_year(p,&year))) return 0;
/* time */
if (!(p = get_time(p,&minutes,&seconds))) return 0;
/* zone */
for (q=p; *q && !isspace(*q); q++) continue;
*q = 0;
if (*p=='-' || *p=='+') {
char sign = *p++;
if (isdigit(*p)) {
for (i=0; i<4; i++) {
if (!isdigit(p[i])) {
dprint(5,(debugfile,"ridiculous numeric timezone: %s\n",p));
return 0;
}
p[i] -= '0';
}
tz = (p[0]*10 + p[1])*60 + p[2]*10 + p[3];
if (sign=='-') tz = -tz;
sprintf(entry->time_zone, "%d", tz);
}
else {
/* some brain-damaged dates use a '-' before a symbolic time zone */
SKIP_WS(p);
strncpy(entry->time_zone, p, sizeof(entry->time_zone) - 1);
tz = tz_lookup(p);
}
}
else {
tz = tz_lookup(p);
strncpy(entry->time_zone, p, sizeof(entry->time_zone) - 1);
}
got_date:
month_len[1] = (year%4) ? 28 : 29;
if (mday<0 || mday>month_len[month]) {
dprint(5,(debugfile,"ridiculous day %d of month %d\n",mday,month));
return 0;
}
/* convert back to symbolic form (silly, but the rest of the program
* expects it and I'm not about to change all that!)
*/
sprintf(entry->year, "%02d", year);
sprintf(entry->month, "%s", month_name[month]);
entry->month[0] = toupper(entry->month[0]);
sprintf(entry->day, "%d", mday);
sprintf(entry->time, "%02d:%02d:%02d",minutes/60,minutes%60,seconds);
/* shift everything to UTC (aka GMT) before making long time for sorting */
minutes -= tz;
if (tz > 0) { /* east of Greenwich */
if (minutes < 0) {
if (--mday < 0) {
if (--month < 0) {
year--; /* don't worry about 1900! */
month = 11;
}
mday = month_len[month];
}
minutes += 24*60;
}
}
if (tz < 0) { /* west of Greenwich */
if (minutes >= 24*60) {
if (++mday > month_len[month]) {
if (++month >= 12) {
year++; /* don't worry about 1999! */
month = 0;
}
mday = 0;
}
minutes -= 24*60;
}
}
gmttime = year - 70; /* make base year */
if (gmttime < 0)
gmttime += 100;
gmttime = gmttime * 365 + (gmttime + 1) / 4; /* now we have days adjusted for leap years */
for (i = 0; i < month; i++)
gmttime += month_len[i];
if (month > 1 && (year % 4) == 0)
gmttime++; /* now to month adjusted for leap year if after feb */
gmttime += mday - 1; /* and now to the day */
gmttime *= 24 * 60; /* convert to minutes */
gmttime += minutes;
entry->time_sent = gmttime * 60; /* now unix seconds since 1/1/70 00:00 GMT */
return 1;
}
fix_arpa_address(address)
char *address;
{
/** Given a pure ARPA address, try to make it reasonable.
This means that if you have something of the form a@b@b make
it a@b. If you have something like a%b%c%b@x make it a%b@x...
**/
register int host_count = 0, i;
char hosts[MAX_HOPS][NLEN]; /* array of machine names */
char *host, *addrptr;
/* break down into a list of machine names, checking as we go along */
addrptr = (char *) address;
while ((host = get_token(addrptr, "%@", 2)) != NULL) {
for (i = 0; i < host_count && ! equal(hosts[i], host); i++)
;
if (i == host_count) {
strcpy(hosts[host_count++], host);
if (host_count == MAX_HOPS) {
dprint(2, (debugfile,
"Can't build return address - hit MAX_HOPS in fix_arpa_address\n"));
error("Can't build return address - hit MAX_HOPS limit!");
return(1);
}
}
else
host_count = i + 1;
addrptr = NULL;
}
/** rebuild the address.. **/
address[0] = '\0';
for (i = 0; i < host_count; i++)
sprintf(address, "%s%s%s", address,
address[0] == '\0'? "" :
(i == host_count - 1 ? "@" : "%"),
hosts[i]);
return(0);
}
figure_out_addressee(buffer, mail_to)
char *buffer;
char *mail_to;
{
/** This routine steps through all the addresses in the "To:"
list, initially setting it to the first entry (if mail_to
is NULL) or, if the user is found (eg "alternatives") to
the current "username".
Modified to know how to read quoted names...
also modified to look for a comma or eol token and then
try to give the maximal useful information when giving the
default "to" entry (e.g. "Dave Taylor <taylor@hpldat>"
will now give "Dave Taylor" rather than just "Dave")
**/
char *address, *bufptr, mybuf[SLEN];
register int index2 = 0;
if (equal(mail_to, username)) return; /* can't be better! */
bufptr = (char *) buffer; /* use the string directly */
if (index(buffer,'"') != NULL) { /* we have a quoted string */
while (*bufptr != '"')
bufptr++;
bufptr++; /* skip the leading quote */
while (*bufptr != '"' && *bufptr)
mail_to[index2++] = *bufptr++;
mail_to[index2] = '\0';
}
else {
while ((address = strtok(bufptr, ",\t\n\r")) != NULL) {
if (! okay_address(address, "don't match me!")) {
strcpy(mail_to, username); /* it's to YOU! */
return;
}
else if (strlen(mail_to) == 0) { /* it's SOMEthing! */
/** this next bit is kinda gory, but allows us to use the
existing routines to parse the address - by pretending
it's a From: line and going from there...
Ah well - you get what you pay for, right?
**/
if (strlen(address) > (sizeof mybuf) - 7) /* ensure it ain't */
address[(sizeof mybuf)-7] = '\0'; /* too long mon! */
sprintf(mybuf, "From: %s", address);
parse_arpa_who(mybuf, mail_to, TRUE);
/**
get_return_name(address, mail_to, FALSE);
**/
}
bufptr = (char *) NULL; /* set to null */
}
}
return;
}