1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463
|
/************************************************************************
* Environment and variable handling routines used by procmail *
* *
* Copyright (c) 1990-1999, S.R. van den Berg, The Netherlands *
* Copyright (c) 2000-2001, Philip Guenther, The United States *
* of America *
* #include "../README" *
************************************************************************/
#ifdef RCS
static /*const*/char rcsid[]=
"$Id: variables.c,v 1.22 2001/08/27 08:53:15 guenther Exp $";
#endif
#include "procmail.h"
#include "acommon.h" /* for hostname() */
#include "common.h" /* for ultstr() */
#include "cstdio.h"
#include "robust.h"
#include "shell.h"
#include "authenticate.h"
#include "goodies.h"
#include "misc.h"
#include "locking.h" /* for lockit() */
#include "comsat.h"
#include "sublib.h"
#include "variables.h"
struct varval strenvvar[]={{"LOCKSLEEP",DEFlocksleep},
{"LOCKTIMEOUT",DEFlocktimeout},{"SUSPEND",DEFsuspend},
{"NORESRETRY",DEFnoresretry},{"TIMEOUT",DEFtimeout},{"VERBOSE",DEFverbose},
{"LOGABSTRACT",DEFlogabstract}};
struct varstr strenstr[]={{"SHELLMETAS",DEFshellmetas},{"LOCKEXT",DEFlockext},
{"MSGPREFIX",DEFmsgprefix},{"TRAP",empty},
{"SHELLFLAGS",DEFshellflags},{"DEFAULT",DEFdefault},{"SENDMAIL",DEFsendmail},
{"SENDMAILFLAGS",DEFflagsendmail},{"PROCMAIL_VERSION",PM_VERSION}};
#define MAXvarvals maxindex(strenvvar)
#define MAXvarstrs maxindex(strenstr)
const char lastfolder[]="LASTFOLDER",maildir[]="MAILDIR",scomsat[]="COMSAT",
offvalue[]="no";
int didchd;
long Stdfilled;
char*Stdout;
static void asenvtext P((const char*const chp)); /* needed by retStdout */
static const char slinebuf[]="LINEBUF",pmoverflow[]="PROCMAIL_OVERFLOW=yes",
exitcode[]="EXITCODE";
static int setxit;
static struct dynstring*myenv;
static char**lastenv;
/* smart putenv, the way it was supposed to be */
const char*sputenv(a)const char*const a;
{ static int alloced;size_t eq,i;int remove;const char*split;char**preenv;
struct dynstring*curr,**last;
yell("Assigning",a);remove=0;
if(!(split=strchr(a,'='))) /* assignment or removal? */
remove=1,split=strchr(a,'\0');
eq=split-a; /* is it */
for(curr= *(last= &myenv);curr;curr= *(last= &curr->enext)) /* one I made */
if(!strncmp(a,curr->ename,eq)&&((char*)curr->ename)[eq]=='=')
{ split=curr->ename;*last=curr->enext;free(curr); /* earlier? */
for(preenv=environ;*preenv!=split;preenv++);
goto wipenv;
}
for(preenv=environ;*preenv;preenv++) /* is it in the standard */
if(!strncmp(a,*preenv,eq)&&(*preenv)[eq]=='=') /* environment? */
wipenv:
{ while(*preenv=preenv[1]) /* wipe this entry out of the environment */
preenv++;
break;
}
i=(preenv-environ+2)*sizeof*environ;
if(alloced) /* have we ever alloced the environ array before? */
environ=realloc(environ,i);
else
alloced=1,environ=tmemmove(malloc(i),environ,i-sizeof*environ);
if(!remove) /* if not remove, then add it to both environments */
{ for(preenv=environ;*preenv;preenv++);
preenv[1]=0;*(lastenv=preenv)=(char*)(split=newdynstring(&myenv,a));
return split+eq+1;
}
return empty;
}
/* between calling primeStdout() and retStdout() *no* environment */
void primeStdout(varname)const char*const varname; /* changes are allowed! */
{ if(!Stdout)
sputenv(varname);
Stdout=(char*)myenv;
Stdfilled=ioffsetof(struct dynstring,ename[0])+strlen(varname);
}
void retStdout(newmyenv,fail,unset) /* see note on primeStdout() */
char*const newmyenv;const int fail,unset;
{ char*var,*p;
if(fail&&unset) /* on second thought... */
{ myenv=((struct dynstring*)newmyenv)->enext; /* pull it back out */
free(newmyenv);*lastenv=Stdout=0;
return;
}
else if(!fail&&newmyenv[Stdfilled-1]=='\n') /* strip one trailing newline */
Stdfilled--;
retbStdout(newmyenv);
var=newmyenv+ioffsetof(struct dynstring,ename[0]); /* setup to copy */
p=strchr(var,'='); /* the variable name into buf */
tmemmove(buf,var,p-var); /* so that we can check */
buf[p-var]='\0'; /* for magic */
if(fail)
asenvtext(p+1); /* we always have to update the pointers for these */
else
asenv(p+1); /* invoke any magic */
}
void retbStdout(newmyenv)char*const newmyenv; /* see note on primeStdout() */
{ newmyenv[Stdfilled]='\0';*lastenv=(myenv=(struct dynstring*)newmyenv)->ename;
Stdout=0;
}
/* Append a space and then `value' to the last variable set */
void appendlastvar(value)const char*const value;
{ size_t len;char*p;
Stdout=(char*)value;primeStdout(empty);
len=Stdfilled+strlen(Stdout+Stdfilled); /* Skip over the header */
p=realloc(Stdout,(Stdfilled=len+1+strlen(value))+1);
p[len]=' ';strcpy(p+len+1,buf);retbStdout(p); /* WARNING: no magic here! */
}
const char*eputenv(src,dst)const char*const src;char*const dst;
{ sgetcp=src;
return readparse(dst,sgetc,2,0)?0:sputenv(buf);
}
void setdef(name,value)const char*const name,*const value;
{ char*p;
strcpy(buf,name); /* insert the variable name */
p=strchr(buf,'\0'); /* (find the end) */
*p++='='; /* then the = */
eputenv(value,p); /* expand the value and call sputenv */
}
const char*tgetenv(a)const char*const a;
{ const char*b;
return (b=getenv(a))?b:empty;
}
void setoverflow P((void))
{ sputenv(pmoverflow);
}
void cleanupenv(preserve)int preserve;
{ static const char*const keepenv[]=KEEPENV,*const ld_[]=LDENV;
const char**emax=(const char**)environ,**ep,*const*pp;
register const char*p;
size_t len;
if(!preserve) /* drop the environment */
{ for(pp=keepenv;*pp;pp++) /* preserve a happy few */
{ len=strlen(*pp);
for(ep=emax;p= *ep;ep++) /* scan for this keeper */
if(!strncmp(*pp,p,len)&&(p[len]=='='||p[len-1]=='_'))
{ *ep= *emax; /* it's fine, swap 'em */
*emax++=p;
if(p[len-1]!='_') /* if this wasn't a wildcard match */
break; /* then go on to next keepenv entry */
}
}
*emax=0; /* drop the rest */
}
else
{ while(*emax) /* find the end of the environment */
emax++;
}
ep=(const char**)environ;
while(*ep) /* check for evil entries */
{ p=strchr(*ep,'=');
if(!p) /* malformed (no '=')? */
drop: { *ep= *--emax;*emax=0; /* copy from the end */
continue; /* check the swapped entry */
}
len=p-*ep+1; /* mark how long the actual name is */
for(pp=(const char*const*)environ;pp!=ep;pp++) /* duplicate entry? */
if(!strncmp(*ep,*pp,len))
goto drop;
for(pp=ld_;p= *pp;pp++) /* does it start with LD_ or similar? */
if(!strncmp(*ep,p,strlen(p)))
goto drop;
ep++;
}
}
void initdefenv(pass,fallback,do_presets)auth_identity*pass;
const char*fallback;int do_presets;
{ const char*p;
if(pass)
{ p=auth_username(pass);
if(!p||!*p)
p=fallback;
setdef(lgname,p);
p=auth_shell(pass);
if(!p||!*p)
p=binsh;
setdef(shell,p);
setdef(home,auth_homedir(pass));setdef(orgmail,auth_mailboxname(pass));
}
else
{ setdef(lgname,fallback);setdef(shell,binsh);
setdef(home,ROOT_DIR);setdef(orgmail,DEAD_LETTER);
}
setlgcs(tgetenv(lgname)); /* make sure sendcomsat has a copy */
if(do_presets)
{ static const char*const prestenv[]=PRESTENV;
const char*const*pp;
int i=MAXvarstrs;
do /* initialise all non-empty string variables into the environment */
if(*strenstr[i].sval)
setdef(strenstr[i].sname,strenstr[i].sval);
while(i--);
setdef(host,hostname()); /* the other standard presets */
sputenv(lastfolder);
sputenv(exitcode);
eputenv(defpath,buf);
for(pp=prestenv;*pp;pp++) /* non-standard presets */
eputenv(*pp,buf);
}
}
int alphanum(c)const unsigned c;
{ switch(c)
{ case '0':case '1':case '2':case '3':case '4':
case '5':case '6':case '7':case '8':case '9':
return 2;
case 'A':case 'B':case 'C':case 'D':case 'E':case 'F':case 'G':case 'H':
case 'I':case 'J':case 'K':case 'L':case 'M':case 'N':case 'O':case 'P':
case 'Q':case 'R':case 'S':case 'T':case 'U':case 'V':case 'W':case 'X':
case 'Y':case 'Z':
case 'a':case 'b':case 'c':case 'd':case 'e':case 'f':case 'g':case 'h':
case 'i':case 'j':case 'k':case 'l':case 'm':case 'n':case 'o':case 'p':
case 'q':case 'r':case 's':case 't':case 'u':case 'v':case 'w':case 'x':
case 'y':case 'z':
case '_':
return 1;
default:
return 0;
}
}
void setmaildir(newdir)const char*const newdir; /* destroys buf2 */
{ char*chp;
didchd=1;*(chp=strcpy(buf2,maildir)+STRLEN(maildir))='=';
strcpy(++chp,newdir);sputenv(buf2);
}
void setlastfolder(folder)const char*const folder;
{ char*chp;size_t len;
setlfcs(folder);
len=STRLEN(lastfolder)+2+strlen(folder);
strcpy(chp=malloc(len),lastfolder);
strlcat(chp,"=",len);
strlcat(chp,folder,len);
sputenv(chp);free(chp);
}
int setexitcode(trapisset)int trapisset;
{ char*p;int forceret;
if(setxit&&(p=getenv(exitcode))) /* user specified exitcode? */
{ if((forceret=renvint(-2L,p))>=0) /* yes, is it positive? */
retval=forceret; /* then override it */
}
else
{ forceret= -1;
if(trapisset) /* no EXITCODE set, TRAP found, provide one */
{ p=buf2+STRLEN(exitcode);
strcpy(buf2,exitcode);*p='=';
ultstr(0,(unsigned long)retval,p+1);sputenv(buf2);
}
}
return forceret;
}
char*gobenv(chp,end)char*chp,*end;
{ int found,i;
found=0;end--;
if(alphanum(i=getb())==1)
for(found=1;*chp++=i,chp<end&&alphanum(i=getb()););
*chp='\0';ungetb(i);
if(chp==end) /* overflow */
{ nlog(exceededlb);setoverflow();
return end+1;
}
switch(i)
{ case ' ':case '\t':case '\n':case '=':
if(found)
return chp;
}
return 0;
}
int asenvcpy(src)char*src;
{ const char*chp;
if(chp=strchr(src,'=')) /* is it an assignment? */
/*
* really change the uid now, since it would not be safe to
* evaluate the extra command line arguments otherwise
*/
{ size_t len=chp++-src+1; /* variable name + '=' */
erestrict=1;setids(); /* always do this */
if(len>linebuf-XTRAlinebuf-1) /* too long of name? */
{ setoverflow();
nlog("Assignment to variable with excessively long name skipped\n");
}
else
{ memcpy(buf,src,len);
src=buf+len;
if(chp=eputenv(chp,src))
{ src[-1]='\0';
asenv(chp);
}
}
return 1;
}
return 0;
}
void allocbuffers(lineb,setenv)size_t lineb;int setenv;
{ if(buf)
{ char*p=buf;
buf=0; /* make sure buf is either valid or NULL */
free(buf2);
free(p);
}
buf=malloc(lineb+XTRAlinebuf);buf2=malloc(lineb+XTRAlinebuf);
if(setenv)
{ char*chp;
*(chp=strcpy(buf,slinebuf)+STRLEN(slinebuf))='=';
ultstr(0,lineb,chp+1);
sputenv(buf);
}
}
static void asenvtext(chp)const char*const chp;
{ int i=MAXvarstrs;
do /* several text assignments */
if(!strcmp(buf,strenstr[i].sname))
strenstr[i].sval=chp;
while(i--);
}
void asenv(chp)const char*const chp;
{ static const char logfile[]="LOGFILE",Log[]="LOG",sdelivered[]="DELIVERED",
includerc[]="INCLUDERC",eumask[]="UMASK",dropprivs[]="DROPPRIVS",
shift[]="SHIFT",switchrc[]="SWITCHRC";
if(!strcmp(buf,slinebuf))
{ long lineb; /* signed to catch negative numbers */
if((lineb=renvint(0L,chp))<MINlinebuf)
lineb=MINlinebuf; /* check minimum size */
allocbuffers(linebuf=lineb,0);
}
else if(!strcmp(buf,maildir))
{ if(chdir(chp))
{ chderr(chp);
setmaildir(curdir);
}
else
didchd=1;
}
else if(!strcmp(buf,logfile))
opnlog(chp);
else if(!strcmp(buf,Log))
elog(chp);
else if(!strcmp(buf,exitcode))
setxit=1;
else if(!strcmp(buf,lgname))
setlgcs(chp);
else if(!strcmp(buf,lastfolder))
setlfcs(chp);
else if(!strcmp(buf,scomsat))
{ if(!setcomsat(chp))
setdef(scomsat,offvalue); /* set it to "no" on failure */
}
else if(!strcmp(buf,shift))
{ int i;
if((i=renvint(0L,chp))>0)
{ if(i>crestarg)
i=crestarg;
crestarg-=i;restargv+=i; /* shift away arguments */
}
}
else if(!strcmp(buf,dropprivs)) /* drop privileges */
{ if(renvint(0L,chp))
{ if(verbose)
nlog("Assuming identity of the recipient, VERBOSE=off\n");
setids();
}
}
else if(!strcmp(buf,sdelivered)) /* fake delivery */
{ if(renvint(0L,chp)) /* is it really? */
{ onguard();
if((thepid=sfork())>0)
_exit(retvl2); /* parent: do not pass go */
if(!forkerr(thepid,procmailn))
fakedelivery=1;
newid();offguard();
}
}
else if(!strcmp(buf,lockfile))
{ if(!lockit(tstrdup((char*)chp),&globlock))
sputenv(lockfile); /* unset it on failure */
}
else if(!strcmp(buf,eumask))
doumask((mode_t)strtol(chp,(char**)0,8));
else if(!strcmp(buf,includerc))
{ if(rc>=0) /* INCLUDERC and SWITCHRC only work */
pushrc(chp); /* inside rcfiles */
} /* and not on the command line */
else if(!strcmp(buf,switchrc))
{ if(rc>=0)
changerc(chp);
}
else if(!strcmp(buf,host))
{ const char*name;
if(strcmp(chp,name=hostname()))
{ yell("HOST mismatched",name);
if(rc<0) /* if no rcfile opened yet */
retval=EXIT_SUCCESS,Terminate(); /* exit gracefully as well */
closerc();
}
}
else
{ int i=MAXvarvals;
do /* several numeric assignments */
if(!strcmp(buf,strenvvar[i].name))
strenvvar[i].val=renvint(strenvvar[i].val,chp);
while(i--);
asenvtext(chp); /* delegate the text assignments */
}
}
long renvint(i,env)const long i;const char*const env;
{ const char*p;long t;
t=strtol(env,(char**)&p,10); /* parse like a decimal nr */
if(p==env)
for(;;p++)
{ switch(*p)
{ case ' ':case '\t':case '\n':case '\v':case '\f':case '\r':
continue; /* skip leading whitespace */
case 'o':case 'O':
if(!strncasecmp(p+1,"n",1))
case 'y':case 'Y':case 't':case 'T':case 'e':case 'E':
t=1;
else if(!strncasecmp(p+1,"ff",2))
case 'n':case 'N':case 'f':case 'F':case 'd':case 'D':
t=0;
else
default:
t=i;
break;
case 'a':case 'A':t=2;
break;
}
break;
}
return t;
}
|