home *** CD-ROM | disk | FTP | other *** search
- #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);
- }
- }
-