File: qmail-popup.c

package info (click to toggle)
qmail 1.01-5
  • links: PTS
  • area: non-free
  • in suites: hamm
  • size: 2,188 kB
  • ctags: 1,711
  • sloc: ansic: 13,993; makefile: 1,914; perl: 448; sh: 377
file content (219 lines) | stat: -rw-r--r-- 4,838 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
#include <sys/types.h>
#include <sys/stat.h>
#include "fd.h"
#include "sig.h"
#include "getln.h"
#include "stralloc.h"
#include "substdio.h"
#include "subfd.h"
#include "alloc.h"
#include "datetime.h"
#include "error.h"
#include "wait.h"
#include "str.h"
#include "now.h"
#include "fmt.h"
#include "exit.h"
#include "readwrite.h"

int timeout = 1200;

int timeoutread(fd,buf,n) int fd; char *buf; int n;
{
 int r; int saveerrno;
 alarm(timeout);
 r = read(fd,buf,n); saveerrno = errno;
 alarm(0);
 errno = saveerrno; return r;
}

char ssinbuf[128];
substdio ssin = SUBSTDIO_FDBUF(timeoutread,0,ssinbuf,sizeof(ssinbuf));


void die() { _exit(1); }
void out(s) char *s;
{
 if (substdio_puts(subfdoutsmall,s) == -1) die();
}
void outflush(s) char *s; 
{
 out(s);
 if (substdio_flush(subfdoutsmall) == -1) die();
}
void err(s) char *s;
{
 if (substdio_puts(subfdoutsmall,"-ERR ") == -1) die();
 if (substdio_puts(subfdoutsmall,s) == -1) die();
 if (substdio_puts(subfdoutsmall,"\r\n") == -1) die();
 if (substdio_flush(subfdoutsmall) == -1) die();
}
void die_usage() { err("usage: popup hostname subprogram"); die(); }
void die_nomem() { err("out of memory"); die(); }
void die_pipe() { err("unable to open pipe"); die(); }
void die_write() { err("unable to write pipe"); die(); }
void die_fork() { err("unable to fork"); die(); }
void die_childcrashed() { err("aack, child crashed"); }
void die_badauth() { err("authorization failed"); }

void err_syntax() { err("syntax error"); }
void err_wantuser() { err("USER first"); }
void err_authoriz() { err("authorization first"); }

void okay() { outflush("+OK \r\n"); }


char unique[FMT_ULONG + FMT_ULONG + 3];
char *hostname;
stralloc username = {0};
int seenuser = 0;
char **childargs;
substdio ssup;
char upbuf[128];


void doanddie(user,userlen,pass)
char *user;
unsigned int userlen; /* including 0 byte */
char *pass;
{
 int child;
 int wstat;
 int pi[2];
 int i;

 if (fd_copy(2,1) == -1) die_pipe();
 close(3);
 if (pipe(pi) == -1) die_pipe();
 if (pi[0] != 3) die_pipe();
 switch(child = fork())
  {
   case -1:
     die_fork();
   case 0:
     close(pi[1]);
     sig_pipedefault();
     execvp(*childargs,childargs);
     _exit(1);
  }
 close(pi[0]);
 substdio_fdbuf(&ssup,write,pi[1],upbuf,sizeof(upbuf));
 if (substdio_put(&ssup,user,userlen) == -1) die_write();
 if (substdio_put(&ssup,pass,str_len(pass) + 1) == -1) die_write();
 if (substdio_puts(&ssup,"<") == -1) die_write();
 if (substdio_puts(&ssup,unique) == -1) die_write();
 if (substdio_puts(&ssup,hostname) == -1) die_write();
 if (substdio_put(&ssup,">",2) == -1) die_write();
 if (substdio_flush(&ssup) == -1) die_write();
 close(pi[1]);
 for (i = 0;pass[i];++i) pass[i] = 0;
 for (i = 0;i < sizeof(upbuf);++i) upbuf[i] = 0;
 if (wait_pid(&wstat,child) == -1) die();
 if (wait_crashed(wstat)) die_childcrashed();
 if (wait_exitcode(wstat)) die_badauth();
 die();
}
void pop3_greet()
{
 char *s;
 s = unique;
 s += fmt_uint(s,getpid());
 *s++ = '.';
 s += fmt_ulong(s,(unsigned long) now());
 *s++ = '@';
 *s++ = 0;

 out("+OK <");
 out(unique);
 out(hostname);
 outflush(">\r\n");
}
void pop3_user(arg) char *arg;
{
 if (!arg) { err_syntax(); return; }
 okay();
 seenuser = 1;
 if (!stralloc_copys(&username,arg)) die_nomem(); 
 if (!stralloc_0(&username)) die_nomem(); 
}
void pop3_pass(arg) char *arg;
{
 if (!seenuser) { err_wantuser(); return; }
 if (!arg) { err_syntax(); return; }
 doanddie(username.s,username.len,arg);
}
void pop3_apop(arg) char *arg;
{
 char *space;
 if (!arg) { err_syntax(); return; }
 space = arg + str_chr(arg,' ');
 if (!*space) { err_syntax(); return; }
 *space++ = 0;
 doanddie(arg,space - arg,space);
}

void pop3_quit() { okay(); die(); }

static struct { void (*fun)(); char *text; } pop3cmd[] = {
  { pop3_user, "user" }
, { pop3_pass, "pass" }
, { pop3_apop, "apop" }
, { pop3_quit, "quit" }
, { okay, "noop" }
, { 0, 0 }
};

void doit(cmd)
char *cmd;
{
 int i;
 int j;
 char ch;

 for (i = 0;pop3cmd[i].fun;++i)
  {
   for (j = 0;ch = pop3cmd[i].text[j];++j)
     if ((cmd[j] != ch) && (cmd[j] != ch - 32))
       break;
   if (!ch)
     if (!cmd[j] || (cmd[j] == ' '))
      {
       while (cmd[j] == ' ') ++j;
       if (!cmd[j])
         pop3cmd[i].fun((char *) 0);
       else
         pop3cmd[i].fun(cmd + j);
       return;
      }
  }
 err_authoriz();
}

void main(argc,argv)
int argc;
char **argv;
{
 static stralloc cmd = {0};
 int match;

 sig_alarmcatch(die);
 sig_pipeignore();

 hostname = argv[1];
 if (!hostname) die_usage();
 childargs = argv + 2;
 if (!*childargs) die_usage();

 pop3_greet();

 for (;;)
  {
   if (getln(&ssin,&cmd,&match,'\n') == -1) die();
   if (!match) die();
   if (cmd.len == 0) die();
   if (cmd.s[--cmd.len] != '\n') die();
   if ((cmd.len > 0) && (cmd.s[cmd.len - 1] == '\r')) --cmd.len;
   cmd.s[cmd.len++] = 0;
   doit(cmd.s);
  }
}