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/* ISC license. */
#include <strings.h>
#include <errno.h>
#include <skalibs/types.h>
#include <skalibs/buffer.h>
#include <skalibs/tai.h>
#include <skalibs/unix-timed.h>
#include "qmailr.h"
#include <skalibs/posixishard.h>
int qmailr_smtp_read_line (buffer *in, char *line, size_t max, unsigned int *code, tain const *deadline)
{
unsigned int c ;
size_t w = 0 ;
ssize_t r = timed_getlnmax_g(in, line, max, &w, '\n', deadline) ;
if (r <= 0) return r ;
if (w < 4) return (errno = EPROTO, -1) ;
line[--w] = 0 ;
if (line[w-1] == '\r') line[--w] = 0 ;
while (w >= 3 && line[w-1] == ' ') line[--w] = 0 ;
if (uint_scan(line, &c) != 3) return (errno = EPROTO, -1) ;
*code = c ;
return 1 + (line[3] == '-') ;
}
int qmailr_smtp_read_answer (buffer *in, char *line, size_t max, unsigned int timeout)
{
unsigned int code = 1000 ;
tain deadline ;
qdeadline(&deadline, timeout) ;
for (;;)
{
unsigned int c ;
int r = qmailr_smtp_read_line(in, line, max, &c, &deadline) ;
if (r <= 0) return r ;
if (code == 1000) code = c ;
else if (code != c) return (errno = EPROTO, -1) ;
if (r == 1) break ;
}
return code ;
}
void qmailr_smtp_quit (buffer *out, unsigned int timeout)
{
tain deadline ;
buffer_puts(out, "QUIT\r\n") ;
qdeadline(&deadline, timeout) ;
buffer_timed_flush_g(out, &deadline) ;
}
int qmailr_smtp_ehlo (buffer *in, buffer *out, char const *helohost, unsigned int timeout)
{
int hastls = 0 ;
tain deadline ;
char line[1024] ;
buffer_putnoflush(out, "EHLO ", 5) ;
buffer_putsnoflush(out, helohost) ;
buffer_putnoflush(out, "\r\n", 2) ;
qdeadline(&deadline, timeout) ;
if (!buffer_timed_flush_g(out, &deadline)) return -1 ;
qdeadline(&deadline, timeout) ;
for (;;)
{
unsigned int code = 250 ;
int r = qmailr_smtp_read_line(in, line, 1024, &code, &deadline) ;
if (r == -1) return -1 ;
if (!r) return (errno = EPIPE, -1) ;
if (code != 250) return (errno = EPROTO, -1) ;
if (!strcasecmp(line + 4, "STARTTLS")) hastls = 1 ;
if (r == 1) break ;
}
return hastls ;
}
int qmailr_smtp_start (buffer *in, buffer *out, char const *helohost, unsigned int timeout)
{
char line[1024] ;
int r = qmailr_smtp_read_answer(in, line, 1024, timeout) ;
if (r == -1) return -1 ;
if (!r) return (errno = EPIPE, -1) ;
if (r != 220)
{
qmailr_smtp_quit(out, timeout) ;
return (errno = EPROTO, -1) ;
}
return qmailr_smtp_ehlo(in, out, helohost, timeout) ;
}
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