qmail-newu.c

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#include <unistd.h>
#include <sys/stat.h>
#include <stdio.h> // rename
#include "stralloc.h"
#include "getln.h"
#include "buffer.h"
#include "cdbmake.h"
#include "exit.h"
#include "open.h"
#include "logmsg.h"
#include "case.h"
#include "byte.h"
#include "auto_qmail.h"
 
#define WHO "qmail-newu"
 
int rename(const char *,const char *); // stdio.h
 
void die_chdir()
{
  logmsg(WHO,110,ERROR,"unable to chdir");
}
void die_nomem()
{
  logmsg(WHO,111,FATAL,"fatal: out of memory");
}
void die_opena()
{
  logmsg(WHO,112,ERROR,"unable to open users/assign");
}
void die_reada()
{
  logmsg(WHO,110,ERROR,"unable to read users/assign");
}
void die_format()
{
  logmsg(WHO,112,ERROR,"bad format in users/assign");
}
void die_opent()
{
  logmsg(WHO,112,ERROR,"unable to open users/assign.cdb.tmp");
}
void die_writet()
{
  logmsg(WHO,112,ERROR,"unable to write users/assign.cdb.tmp");
}
void die_rename()
{
  logmsg(WHO,112,ERROR,"unable to move users/cdb.tmp to users/assign.cdb");
}
 
struct cdb_make cdb;
stralloc key = {0};
stralloc data = {0};
 
char inbuf[1024];
buffer bi;
 
int fd;
int fdtemp;
 
stralloc line = {0};
int match;
 
stralloc wildchars = {0};
 
int main()
{
  int i;
  int numcolons;
 
  umask(033);
  if (chdir(auto_qmail) == -1) die_chdir();
 
  fd = open_read("users/assign");
  if (fd == -1) die_opena();
 
  buffer_init(&bi,read,fd,inbuf,sizeof(inbuf));
 
  fdtemp = open_trunc("users/assign.cdb.tmp");
  if (fdtemp == -1) die_opent();
 
  if (cdb_make_start(&cdb,fdtemp) == -1) die_writet();
 
  if (!stralloc_copys(&wildchars,"")) die_nomem();
 
  for (;;) {
    if (getln(&bi,&line,&match,'\n') != 0) die_reada();
    if (line.len && (line.s[0] == '.')) break;
    if (!match) die_format();
 
    if (byte_chr(line.s,line.len,'\0') < line.len) die_format();
    i = byte_chr(line.s,line.len,':');
    if (i == line.len) die_format();
    if (i == 0) die_format();
    if (!stralloc_copys(&key,"!")) die_nomem();
    if (line.s[0] == '+') {
      if (!stralloc_catb(&key,line.s + 1,i - 1)) die_nomem();
      case_lowerb(key.s,key.len);
      if (i >= 2)
        if (byte_chr(wildchars.s,wildchars.len,line.s[i - 1]) == wildchars.len)
      if (!stralloc_append(&wildchars,line.s + i - 1)) die_nomem();
    }
    else {
      if (!stralloc_catb(&key,line.s + 1,i - 1)) die_nomem();
      if (!stralloc_0(&key)) die_nomem();
      case_lowerb(key.s,key.len);
    }
 
    if (!stralloc_copyb(&data,line.s + i + 1,line.len - i - 1)) die_nomem();
 
    numcolons = 0;
    for (i = 0; i < data.len; ++i)
      if (data.s[i] == ':') {
        data.s[i] = 0;
        if (++numcolons == 6) break;
      }
    if (numcolons < 6) die_format();
    data.len = i;
 
    if (cdb_make_add(&cdb,key.s,key.len,data.s,data.len) == -1) die_writet();
  }
 
  if (cdb_make_add(&cdb,"",0,wildchars.s,wildchars.len) == -1) die_writet();
 
  if (cdb_make_finish(&cdb) == -1) die_writet();
  if (fsync(fdtemp) == -1) die_writet();
  if (close(fdtemp) == -1) die_writet(); /* NFS stupidity */
  if (rename("users/assign.cdb.tmp","users/assign.cdb") == -1) die_rename();
 
  _exit(0);
}