generic-conf.c

   1 #include <unistd.h>
   2 #include <sys/types.h>
   3 #include <sys/stat.h>
   4 #include "strerr.h"
   5 #include "buffer.h"
   6 #include "open.h"
   7 #include "generic-conf.h"
   8
   9 static const char *fatal;
  10 static const char *dir;
  11 static const char *fn;
  12
  13 static int fd;
  14 static char buf[1024];
  15 static buffer ss;
  16
  17 void init(const char *d,const char *f)
  18 {
  19   dir = d;
  20   fatal = f;
  21   umask(022);
  22   if (mkdir(dir,0700) == -1)
  23     strerr_die4sys(111,fatal,"unable to create ",dir,": ");
  24   if (chmod(dir,03755) == -1)
  25     strerr_die4sys(111,fatal,"unable to set mode of ",dir,": ");
  26   if (chdir(dir) == -1)
  27     strerr_die4sys(111,fatal,"unable to switch to ",dir,": ");
  28 }
  29
  30 void fail(void)
  31 {
  32   strerr_die6sys(111,fatal,"unable to create ",dir,"/",fn,": ");
  33 }
  34
  35 void makedir(const char *s)
  36 {
  37   fn = s;
  38   if (mkdir(fn,0700) == -1) fail();
  39 }
  40
  41 void start(const char *s)
  42 {
  43   fn = s;
  44   fd = open_trunc(fn);
  45   if (fd == -1) fail();
  46   buffer_init(&ss,buffer_unixwrite,fd,buf,sizeof buf);
  47 }
  48
  49 void outs(const char *s)
  50 {
  51   if (buffer_puts(&ss,s) == -1) fail();
  52 }
  53
  54 void out(const char *s,unsigned int len)
  55 {
  56   if (buffer_put(&ss,s,len) == -1) fail();
  57 }
  58
  59 void copyfrom(buffer *b)
  60 {
  61   if (buffer_copy(&ss,b) < 0) fail();
  62 }
  63
  64 void finish(void)
  65 {
  66   if (buffer_flush(&ss) == -1) fail();
  67   if (fsync(fd) == -1) fail();
  68   close(fd);
  69 }
  70
  71 void perm(int mode)
  72 {
  73   if (chmod(fn,mode) == -1) fail();
  74 }
  75
  76 void owner(int uid,int gid)
  77 {
  78   if (chown(fn,uid,gid) == -1) fail();
  79 }
  80
  81 void makelog(const char *user,int uid,int gid)
  82 {
  83   makedir("log");
  84   perm(02755);
  85   makedir("log/main");
  86   owner(uid,gid);
  87   perm(02755);
  88   start("log/status");
  89   finish();
  90   owner(uid,gid);
  91   perm(0644);
  92
  93   start("log/run");
  94   outs("#!/bin/sh\nexec");
  95   outs(" setuidgid "); outs(user);
  96   outs(" multilog t ./main\n");
  97   finish();
  98   perm(0755);
  99 }