6 #define UTMP_FILE _PATH_UTMP
8 #define UTMP_FILE "/etc/utmp"
11 #include "readwrite.h"
18 #include "headerbody.h"
24 char bufutmp[sizeof(struct utmp) * 16];
31 char line[sizeof(ut.ut_line) + 1];
33 stralloc tofrom = {0};
36 void doit(s,n) char *s; int n;
38 if (!stralloc_catb(&text,s,n)) _exit(0);
39 if (text.len > 78) text.len = 78;
41 void dobody(h) stralloc *h; { doit(h->s,h->len); }
42 void doheader(h) stralloc *h;
45 if (hfield_known(h->s,h->len) == H_SUBJECT)
47 i = hfield_skipname(h->s,h->len);
48 doit(h->s + i,h->len - i);
51 void finishheader() { ; }
61 if (chdir("/dev") == -1) _exit(0);
63 if (!(user = env_get("USER"))) _exit(0);
64 if (!(sender = env_get("SENDER"))) _exit(0);
65 if (!(userext = env_get("LOCAL"))) _exit(0);
66 if (str_len(user) > sizeof(ut.ut_name)) _exit(0);
68 if (!stralloc_copys(&tofrom,"*** TO <")) _exit(0);
69 if (!stralloc_cats(&tofrom,userext)) _exit(0);
70 if (!stralloc_cats(&tofrom,"> FROM <")) _exit(0);
71 if (!stralloc_cats(&tofrom,sender)) _exit(0);
72 if (!stralloc_cats(&tofrom,">")) _exit(0);
74 for (i = 0;i < tofrom.len;++i)
75 if ((tofrom.s[i] < 32) || (tofrom.s[i] > 126))
78 if (!stralloc_copys(&text," ")) _exit(0);
79 if (headerbody(subfdin,doheader,finishheader,dobody) == -1) _exit(0);
81 for (i = 0;i < text.len;++i)
82 if ((text.s[i] < 32) || (text.s[i] > 126))
85 if (!stralloc_copys(&woof,"\015\n\007")) _exit(0);
86 if (!stralloc_cat(&woof,&tofrom)) _exit(0);
87 if (!stralloc_cats(&woof,"\015\n")) _exit(0);
88 if (!stralloc_cat(&woof,&text)) _exit(0);
89 if (!stralloc_cats(&woof,"\015\n")) _exit(0);
91 fdutmp = open_read(UTMP_FILE);
92 if (fdutmp == -1) _exit(0);
93 substdio_fdbuf(&ssutmp,read,fdutmp,bufutmp,sizeof(bufutmp));
95 while (substdio_get(&ssutmp,&ut,sizeof(ut)) == sizeof(ut))
96 if (!str_diffn(ut.ut_name,user,sizeof(ut.ut_name)))
98 byte_copy(line,sizeof(ut.ut_line),ut.ut_line);
99 line[sizeof(ut.ut_line)] = 0;
100 if (line[0] == '/') continue;
101 if (!line[0]) continue;
102 if (line[str_chr(line,'.')]) continue;
103 fdtty = open_append(line);
104 if (fdtty == -1) continue;
105 if (fstat(fdtty,&st) == -1) { close(fdtty); continue; }
106 if (!(st.st_mode & 0100)) { close(fdtty); continue; }
107 if (st.st_uid != getuid()) { close(fdtty); continue; }
108 substdio_fdbuf(&sstty,write,fdtty,buftty,sizeof(buftty));
109 substdio_putflush(&sstty,woof.s,woof.len);