diff options
Diffstat (limited to 'src/macro.c')
| -rw-r--r-- | src/macro.c | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/src/macro.c b/src/macro.c new file mode 100644 index 0000000..0f31d11 --- /dev/null +++ b/src/macro.c @@ -0,0 +1,457 @@ +/* + * Copyright (c) 1983, 1995-1997 Eric P. Allman + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)macro.c 8.18 (Berkeley) 2/1/97"; +#endif /* not lint */ + +# include "sendmail.h" + +char *MacroName[256]; /* macro id to name table */ +int NextMacroId = 0240; /* codes for long named macros */ + + +/* +** EXPAND -- macro expand a string using $x escapes. +** +** Parameters: +** s -- the string to expand. +** buf -- the place to put the expansion. +** bufsize -- the size of the buffer. +** e -- envelope in which to work. +** +** Returns: +** none. +** +** Side Effects: +** none. +*/ + +void +expand(s, buf, bufsize, e) + register char *s; + register char *buf; + size_t bufsize; + register ENVELOPE *e; +{ + register char *xp; + register char *q; + bool skipping; /* set if conditionally skipping output */ + bool recurse = FALSE; /* set if recursion required */ + int i; + int skiplev; /* skipping nesting level */ + int iflev; /* if nesting level */ + char xbuf[BUFSIZ]; + static int explevel = 0; + + if (tTd(35, 24)) + { + printf("expand("); + xputs(s); + printf(")\n"); + } + + skipping = FALSE; + skiplev = 0; + iflev = 0; + if (s == NULL) + s = ""; + for (xp = xbuf; *s != '\0'; s++) + { + int c; + + /* + ** Check for non-ordinary (special?) character. + ** 'q' will be the interpolated quantity. + */ + + q = NULL; + c = *s; + switch (c & 0377) + { + case CONDIF: /* see if var set */ + iflev++; + c = *++s; + if (skipping) + skiplev++; + else + skipping = macvalue(c, e) == NULL; + continue; + + case CONDELSE: /* change state of skipping */ + if (iflev == 0) + break; + if (skiplev == 0) + skipping = !skipping; + continue; + + case CONDFI: /* stop skipping */ + if (iflev == 0) + break; + iflev--; + if (skiplev == 0) + skipping = FALSE; + if (skipping) + skiplev--; + continue; + + case MACROEXPAND: /* macro interpolation */ + c = *++s & 0377; + if (c != '\0') + q = macvalue(c, e); + else + { + s--; + q = NULL; + } + if (q == NULL) + continue; + break; + } + + /* + ** Interpolate q or output one character + */ + + if (skipping || xp >= &xbuf[sizeof xbuf - 1]) + continue; + if (q == NULL) + *xp++ = c; + else + { + /* copy to end of q or max space remaining in buf */ + while ((c = *q++) != '\0' && xp < &xbuf[sizeof xbuf - 1]) + { + /* check for any sendmail metacharacters */ + if ((c & 0340) == 0200) + recurse = TRUE; + *xp++ = c; + } + } + } + *xp = '\0'; + + if (tTd(35, 24)) + { + printf("expand ==> "); + xputs(xbuf); + printf("\n"); + } + + /* recurse as appropriate */ + if (recurse) + { + if (explevel < MaxMacroRecursion) + { + explevel++; + expand(xbuf, buf, bufsize, e); + explevel--; + return; + } + syserr("expand: recursion too deep (%d max)", + MaxMacroRecursion); + } + + /* copy results out */ + i = xp - xbuf; + if (i >= bufsize) + i = bufsize - 1; + bcopy(xbuf, buf, i); + buf[i] = '\0'; +} + /* +** DEFINE -- define a macro. +** +** this would be better done using a #define macro. +** +** Parameters: +** n -- the macro name. +** v -- the macro value. +** e -- the envelope to store the definition in. +** +** Returns: +** none. +** +** Side Effects: +** e->e_macro[n] is defined. +** +** Notes: +** There is one macro for each ASCII character, +** although they are not all used. The currently +** defined macros are: +** +** $a date in ARPANET format (preferring the Date: line +** of the message) +** $b the current date (as opposed to the date as found +** the message) in ARPANET format +** $c hop count +** $d (current) date in UNIX (ctime) format +** $e the SMTP entry message+ +** $f raw from address +** $g translated from address +** $h to host +** $i queue id +** $j official SMTP hostname, used in messages+ +** $k UUCP node name +** $l UNIX-style from line+ +** $m The domain part of our full name. +** $n name of sendmail ("MAILER-DAEMON" on local +** net typically)+ +** $o delimiters ("operators") for address tokens+ +** $p my process id in decimal +** $q the string that becomes an address -- this is +** normally used to combine $g & $x. +** $r protocol used to talk to sender +** $s sender's host name +** $t the current time in seconds since 1/1/1970 +** $u to user +** $v version number of sendmail +** $w our host name (if it can be determined) +** $x signature (full name) of from person +** $y the tty id of our terminal +** $z home directory of to person +** $_ RFC1413 authenticated sender address +** +** Macros marked with + must be defined in the +** configuration file and are used internally, but +** are not set. +** +** There are also some macros that can be used +** arbitrarily to make the configuration file +** cleaner. In general all upper-case letters +** are available. +*/ + +void +define(n, v, e) + int n; + char *v; + register ENVELOPE *e; +{ + if (tTd(35, 9)) + { + printf("%sdefine(%s as ", + (e->e_macro[n & 0377] == NULL) ? "" : "re", macname(n)); + xputs(v); + printf(")\n"); + } + e->e_macro[n & 0377] = v; +} + /* +** MACVALUE -- return uninterpreted value of a macro. +** +** Parameters: +** n -- the name of the macro. +** +** Returns: +** The value of n. +** +** Side Effects: +** none. +*/ + +char * +macvalue(n, e) + int n; + register ENVELOPE *e; +{ + n &= 0377; + while (e != NULL) + { + register char *p = e->e_macro[n]; + + if (p != NULL) + return (p); + e = e->e_parent; + } + return (NULL); +} + /* +** MACNAME -- return the name of a macro given its internal id +** +** Parameter: +** n -- the id of the macro +** +** Returns: +** The name of n. +** +** Side Effects: +** none. +*/ + +char * +macname(n) + int n; +{ + static char mbuf[2]; + + n &= 0377; + if (bitset(0200, n)) + { + char *p = MacroName[n]; + + if (p != NULL) + return p; + return "***UNDEFINED MACRO***"; + } + mbuf[0] = n; + mbuf[1] = '\0'; + return mbuf; +} + /* +** MACID -- return id of macro identified by its name +** +** Parameters: +** p -- pointer to name string -- either a single +** character or {name}. +** ep -- filled in with the pointer to the byte +** after the name. +** +** Returns: +** The internal id code for this macro. This will +** fit into a single byte. +** +** Side Effects: +** If this is a new macro name, a new id is allocated. +*/ + +int +macid(p, ep) + register char *p; + char **ep; +{ + int mid; + register char *bp; + char mbuf[21]; + + if (tTd(35, 14)) + { + printf("macid("); + xputs(p); + printf(") => "); + } + + if (*p == '\0' || (p[0] == '{' && p[1] == '}')) + { + syserr("Name required for macro/class"); + if (ep != NULL) + *ep = p; + if (tTd(35, 14)) + printf("NULL\n"); + return '\0'; + } + if (*p != '{') + { + /* the macro is its own code */ + if (ep != NULL) + *ep = p + 1; + if (tTd(35, 14)) + printf("%c\n", *p); + return *p; + } + bp = mbuf; + while (*++p != '\0' && *p != '}' && bp < &mbuf[sizeof mbuf]) + { + if (isascii(*p) && (isalnum(*p) || *p == '_')) + *bp++ = *p; + else + syserr("Invalid macro/class character %c", *p); + } + *bp = '\0'; + mid = -1; + if (*p == '\0') + { + syserr("Unbalanced { on %s", mbuf); /* missing } */ + } + else if (*p != '}') + { + syserr("Macro/class name ({%s}) too long (%d chars max)", + mbuf, sizeof mbuf - 1); + } + else if (mbuf[1] == '\0') + { + /* ${x} == $x */ + mid = mbuf[0]; + p++; + } + else + { + register STAB *s; + + s = stab(mbuf, ST_MACRO, ST_ENTER); + if (s->s_macro != 0) + mid = s->s_macro; + else + { + if (NextMacroId > 0377) + { + syserr("Macro/class {%s}: too many long names", mbuf); + s->s_macro = -1; + } + else + { + MacroName[NextMacroId] = s->s_name; + s->s_macro = mid = NextMacroId++; + } + } + p++; + } + if (ep != NULL) + *ep = p; + if (tTd(35, 14)) + printf("0x%x\n", mid); + return mid; +} + /* +** WORDINCLASS -- tell if a word is in a specific class +** +** Parameters: +** str -- the name of the word to look up. +** cl -- the class name. +** +** Returns: +** TRUE if str can be found in cl. +** FALSE otherwise. +*/ + +bool +wordinclass(str, cl) + char *str; + int cl; +{ + register STAB *s; + + s = stab(str, ST_CLASS, ST_FIND); + return s != NULL && bitnset(cl & 0xff, s->s_class); +} |