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/* ISC license. */
#include <unistd.h>
#include <skalibs/gccattributes.h>
#include <skalibs/types.h>
#include <skalibs/buffer.h>
#include <skalibs/gol.h>
#include <skalibs/tai.h>
#include <skalibs/unix-timed.h>
#include "qmailr.h"
enum gola_e
{
GOLA_TIMEOUT,
GOLA_FDR,
GOLA_FDW,
GOLA_N
} ;
static inline unsigned int qgol_argv (char const *const *argv, gol_bool const *b, unsigned int bn, gol_arg const *a, unsigned int an, uint64_t *br, char const **ar)
{
int problem = 0 ;
int r = gol(argv, b, bn, a, an, br, ar, &problem) ;
if (r < 0)
{
if (problem > 0)
{
char s[2] = { argv[-r-1][problem], 0 } ;
qmailr_perm("qmail-remote-io: ", "unrecognized ", "short ", "option: ", s) ;
}
else if (!problem)
qmailr_perm("qmail-remote-io: ", "invalid ", "option: ", argv[-r-1]) ;
else if (problem == -1)
qmailr_perm("qmail-remote-io: ", "unrecognized ", "boolean ", "option: ", argv[-r-1]) ;
else
qmailr_perm("qmail-remote-io: ", "unrecognized ", "option with argument: ", argv[-r-1]) ;
}
else return r ;
}
static inline unsigned int qgol_main (int argc, char const *const *argv, gol_bool const *b, unsigned int bn, gol_arg const *a, unsigned int an, uint64_t *br, char const **ar)
{
if (argc < 1 || argv[argc]) qmailr_perm("qmail-remote-io: ", "invalid argc/argv") ;
if (argc == 1) return 1 ;
return 1 + qgol_argv(argv + 1, b, bn, a, an, br, ar) ;
}
static unsigned int read_answer_options (buffer *in, unsigned int timeout, char *buf, size_t buflen, char const *fmtip, unsigned int flags)
{
int r = qmailr_smtp_read_answer(in, buf, buflen, timeout) ;
if (r == -1) qmailr_tempsys("qmail-remote-io: ", "unable to ", "read SMTP answer from ", fmtip, flags & 1 ? " (Possible duplicate!)" : "") ;
if (!r) qmailr_tempsys("qmail-remote-io: ", fmtip, " closed the connection early", flags & 1 ? " (Possible duplicate!)" : "") ;
return r ;
}
static unsigned read_answer (buffer *in, unsigned int timeout, char *buf, size_t buflen, char const *fmtip)
{
return read_answer_options(in, timeout, buf, buflen, fmtip, 0) ;
}
static void put (buffer *out, char const *s)
{
if (buffer_puts(out, s) < 0)
qmailr_tempsys("qmail-remote-io: ", "unable to ", "queue SMTP command") ;
}
static void datachar (buffer *out, char c)
{
if (buffer_put(out, &c, 1) < 1)
qmailr_tempsys("qmail-remote-io: ", "unable to ", "send character after DATA") ;
}
/*
small DFA for blast() to quote dots and newlines
0 1 2 3
st\ev EOF . \n other
0 qp rp p
START END INLINE START INLINE
1 p rp p
INLINE X INLINE START INLINE
END=2 X=3
0x10 q quote with .
0x20 r quote with \r
0x40 p print char
*/
static inline uint8_t cclass (char c)
{
return c == '.' ? 1 : c == '\n' ? 2 : 3 ;
}
static void blast (buffer *out, unsigned int timeout)
{
static uint8_t const table[2][4] =
{
{ 0x02, 0x51, 0x60, 0x41 },
{ 0x03, 0x41, 0x60, 0x41 }
} ;
uint8_t state = 0 ;
while (state < 2)
{
char c ;
uint8_t val ;
ssize_t r = buffer_get(buffer_0, &c, 1) ;
if (r == -1) qmailr_tempsys("qmail-remote-io: ", "unable to ", "read message") ;
val = r ? table[state][cclass(c)] : table[state][0] ;
state = val & 3 ;
if (val & 0x10) datachar(out, '.') ;
if (val & 0x20) datachar(out, '\r') ;
if (val & 0x40) datachar(out, c) ;
}
if (state > 2) qmailr_perm("qmail-remote-io: ", "SMTP cannot transfer messages with partial final lines") ;
if (buffer_putflush(out, ".\r\n", 3) < 0) qmailr_tempsys("qmail-remote-io: ", "unable to ", "finalize message data") ;
}
static void smtp_body (buffer *in, buffer *out, char const *fmtip, char const *sender, char const *const *recip, unsigned int n, unsigned int timeout) gccattr_noreturn ;
static void smtp_body (buffer *in, buffer *out, char const *fmtip, char const *sender, char const *const *recip, unsigned int n, unsigned int timeout)
{
tain deadline ;
unsigned int code ;
int flagbother = 0 ;
char buf[4096] ;
put(out, "MAIL FROM:<") ;
put(out, sender) ;
put(out, ">\r\n") ;
tain_addsec_g(&deadline, timeout) ;
if (!buffer_timed_flush_g(out, &deadline))
qmailr_tempsys("qmail-remote-io: ", "unable to ", "send command to ", fmtip) ;
code = read_answer(in, timeout, buf, 4096, fmtip) ;
if (code >= 500)
{
qmailr_smtp_quit(out, timeout) ;
qmailr_perm("qmail-remote-io: ", "connected to ", fmtip, " but sender was rejected") ;
}
else if (code >= 400)
{
qmailr_smtp_quit(out, timeout) ;
qmailr_temp("qmail-remote-io: ", "connected to ", fmtip, " but sender was rejected") ;
}
for (unsigned int i = 0 ; i < n ; i++)
{
put(out, "RCPT TO:<") ;
put(out, recip[i]) ;
put(out, ">\r\n") ;
tain_addsec_g(&deadline, timeout) ;
if (!buffer_timed_flush_g(out, &deadline))
qmailr_tempsys("qmail-remote-io: ", "unable to ", "send command to ", fmtip) ;
code = read_answer(in, timeout, buf, 4096, fmtip) ;
if (code >= 500)
{
qmailr_smtp_quit(out, timeout) ;
qmailr_die('h', fmtip, " does not like recipient.\n", "Remote host said: ", buf+4) ;
}
else if (code >= 400)
{
qmailr_smtp_quit(out, timeout) ;
qmailr_die('s', fmtip, " does not like recipient.\n", "Remote host said: ", buf+4) ;
}
else
{
buffer_put(buffer_1, "r", 2) ;
flagbother = 1 ;
}
}
if (!flagbother)
{
qmailr_smtp_quit(out, timeout) ;
qmailr_perm("Giving up on ", fmtip) ;
}
put(out, "DATA\r\n") ;
tain_addsec_g(&deadline, timeout) ;
if (!buffer_timed_flush_g(out, &deadline))
qmailr_tempsys("qmail-remote-io: ", "unable to ", "send command to ", fmtip) ;
code = read_answer(in, timeout, buf, 4096, fmtip) ;
if (code >= 500)
{
qmailr_smtp_quit(out, timeout) ;
qmailr_perm(fmtip, " failed on DATA command") ;
}
else if (code >= 400)
{
qmailr_smtp_quit(out, timeout) ;
qmailr_temp(fmtip, " failed on DATA command") ;
}
blast(out, timeout) ;
code = read_answer_options(in, timeout, buf, 4096, fmtip, 1) ;
if (code >= 500)
{
qmailr_smtp_quit(out, timeout) ;
qmailr_perm(fmtip, " failed after I sent the message") ;
}
else if (code >= 400)
{
qmailr_smtp_quit(out, timeout) ;
qmailr_temp(fmtip, " failed after I sent the message") ;
}
qmailr_smtp_quit(out, timeout) ;
qmailr_die('K', fmtip, " accepted message") ;
}
int main (int argc, char const *const *argv)
{
static gol_arg const rgola[] =
{
{ .so = 't', .lo = "timeoutremote", .i = GOLA_TIMEOUT },
{ .so = '6', .lo = "fdr", .i = GOLA_FDR },
{ .so = '7', .lo = "fdw", .i = GOLA_FDW },
} ;
char const *wgola[GOLA_N] = { 0 } ;
unsigned int fdr = 6, fdw = 7 ;
unsigned int timeoutremote = 1200 ;
buffer in, out ;
char inbuf[1024] ;
char outbuf[BUFFER_OUTSIZE] ;
unsigned int golc = qgol_main(argc, argv, 0, 0, rgola, 3, 0, wgola) ;
argc -= golc ; argv += golc ;
if (argc < 3) qmailr_perm("qmail-remote-io: ", "too few arguments") ;
if (wgola[GOLA_TIMEOUT] && !uint0_scan(wgola[GOLA_TIMEOUT], &timeoutremote))
qmailr_perm("qmail-remote-io: ", "invalid timeoutremote") ;
if (wgola[GOLA_FDR] && !uint0_scan(wgola[GOLA_FDR], &fdr))
qmailr_perm("qmail-remote-io: ", "invalid fdr") ;
if (wgola[GOLA_FDW] && !uint0_scan(wgola[GOLA_FDW], &fdw))
qmailr_perm("qmail-remote-io: ", "invalid fdw") ;
buffer_init(&in, &buffer_read, fdr, inbuf, 1024) ;
buffer_init(&out, &buffer_write, fdw, outbuf, BUFFER_OUTSIZE) ;
tain_now_set_stopwatch_g() ;
smtp_body(&in, &out, argv[0], argv[1], argv + 2, argc - 2, timeoutremote) ;
}
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