qmail-getpw.c

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#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <unistd.h>
#include "error.h"
#include "buffer.h"
#include "exit.h"
#include "byte.h"
#include "str.h"
#include "case.h"
#include "fmt.h"
#include "auto_usera.h"
#include "auto_break.h"
#include "qlx.h"
 
#define GETPW_USERLEN 32
 
char *local;
struct passwd *pw;
char *dash;
char *extension;
 
static int userext()
{
  char username[GETPW_USERLEN];
  struct stat st;
 
  extension = local + str_len(local);
  for (;;) {
    if (extension - local < sizeof(username))
      if (!*extension || (*extension == *auto_break)) {
        byte_copy(username,extension - local,local);
        username[extension - local] = 0;
        case_lowers(username);
        errno = 0;
        pw = getpwnam(username);
        if (errno == ETXTBSY) _exit(QLX_SYS);
        if (pw)
          if (pw->pw_uid)
            if (stat(pw->pw_dir,&st) == 0) {
              if (st.st_uid == pw->pw_uid) {
                dash = "";
                if (*extension) { ++extension; dash = "-"; }
                return 1;
              }
            } else {
              if (errno) _exit(QLX_NFS);
            }
      }
    if (extension == local) return 0;
    --extension;
  }
}
 
char num[FMT_ULONG];
 
int main(int argc,char * const *argv)
{
  local = argv[1];
  if (!local) _exit(100);
 
  if (!userext()) {
    extension = local;
    dash = "-";
    pw = getpwnam(auto_usera);
  }
 
  if (!pw) _exit(QLX_NOALIAS);
 
  buffer_puts(buffer_1small,pw->pw_name);
  buffer_put(buffer_1small,"",1);
  buffer_put(buffer_1small,num,fmt_ulong(num,(long) pw->pw_uid));
  buffer_put(buffer_1small,"",1);
  buffer_put(buffer_1small,num,fmt_ulong(num,(long) pw->pw_gid));
  buffer_put(buffer_1small,"",1);
  buffer_puts(buffer_1small,pw->pw_dir);
  buffer_put(buffer_1small,"",1);
  buffer_puts(buffer_1small,dash);
  buffer_put(buffer_1small,"",1);
  buffer_puts(buffer_1small,extension);
  buffer_put(buffer_1small,"",1);
  buffer_flush(buffer_1small);
 
  _exit(0);
}