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qbiff.c (2625B)

      1 #include <sys/types.h>
      2 #include <sys/stat.h>
      3 #include "qtmp.h"
      4 #include "readwrite.h"
      5 #include "stralloc.h"
      6 #include "substdio.h"
      7 #include "subfd.h"
      8 #include "open.h"
      9 #include "byte.h"
     10 #include "str.h"
     11 #include "headerbody.h"
     12 #include "hfield.h"
     13 #include "env.h"
     14 #include "exit.h"
     15 
     16 substdio sstty;
     17 char buftty[1024];
     18 int fdtty;
     19 
     20 UTMP_INIT;
     21 char line[sizeof(ut->ut_line) + 1];
     22 stralloc woof = {0};
     23 stralloc tofrom = {0};
     24 stralloc text = {0};
     25 
     26 void doit(s,n) char *s; int n;
     27 {
     28  if (!stralloc_catb(&text,s,n)) _exit(0);
     29  if (text.len > 78) text.len = 78;
     30 }
     31 void dobody(h) stralloc *h; { doit(h->s,h->len); }
     32 void doheader(h) stralloc *h;
     33 {
     34  int i;
     35  if (hfield_known(h->s,h->len) == H_SUBJECT)
     36   {
     37    i = hfield_skipname(h->s,h->len);
     38    doit(h->s + i,h->len - i);
     39   }
     40 }
     41 void finishheader() { ; }
     42 
     43 int main(void)
     44 {
     45  char *user;
     46  char *sender;
     47  char *userext;
     48  struct stat st;
     49  int i;
     50 
     51  if (chdir("/dev") == -1) return 0;
     52 
     53  if (!(user = env_get("USER"))) return 0;
     54  if (!(sender = env_get("SENDER"))) return 0;
     55  if (!(userext = env_get("LOCAL"))) return 0;
     56  if (str_len(user) > sizeof(ut->UTMP_USER)) return 0;
     57 
     58  if (!stralloc_copys(&tofrom,"*** TO <")) return 0;
     59  if (!stralloc_cats(&tofrom,userext)) return 0;
     60  if (!stralloc_cats(&tofrom,"> FROM <")) return 0;
     61  if (!stralloc_cats(&tofrom,sender)) return 0;
     62  if (!stralloc_cats(&tofrom,">")) return 0;
     63 
     64  for (i = 0;i < tofrom.len;++i)
     65    if ((tofrom.s[i] < 32) || (tofrom.s[i] > 126))
     66      tofrom.s[i] = '_';
     67 
     68  if (!stralloc_copys(&text,"    ")) return 0;
     69  if (headerbody(subfdin,doheader,finishheader,dobody) == -1) return 0;
     70 
     71  for (i = 0;i < text.len;++i)
     72    if ((text.s[i] < 32) || (text.s[i] > 126))
     73      text.s[i] = '/';
     74 
     75  if (!stralloc_copys(&woof,"\015\n\007")) return 0;
     76  if (!stralloc_cat(&woof,&tofrom)) return 0;
     77  if (!stralloc_cats(&woof,"\015\n")) return 0;
     78  if (!stralloc_cat(&woof,&text)) return 0;
     79  if (!stralloc_cats(&woof,"\015\n")) return 0;
     80 
     81  UTMP_OPEN;
     82 
     83  while (UTMP_READ_MORE)
     84    if (UTMP_TYPE_MATCHES && !str_diffn(ut->UTMP_USER,user,sizeof(ut->UTMP_USER)))
     85     {
     86      byte_copy(line,sizeof(ut->ut_line),ut->ut_line);
     87      line[sizeof(ut->ut_line)] = 0;
     88      if (line[0] == '/') continue;
     89      if (!line[0]) continue;
     90      if (line[str_chr(line,'.')]) continue;
     91      fdtty = open_append(line);
     92      if (fdtty == -1) continue;
     93      if (fstat(fdtty,&st) == -1) { close(fdtty); continue; }
     94      if (!(st.st_mode & 0100)) { close(fdtty); continue; }
     95      if (st.st_uid != getuid()) { close(fdtty); continue; }
     96      substdio_fdbuf(&sstty,write,fdtty,buftty,sizeof(buftty));
     97      substdio_putflush(&sstty,woof.s,woof.len);
     98      close(fdtty);
     99     }
    100  return 0;
    101 }