X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/f3ebb786e451da973560f1c9d8cdb151d25108b5..2ead369f8435918f3f15408b9394e580bcaf0910:/src/src/smtp_out.c diff --git a/src/src/smtp_out.c b/src/src/smtp_out.c index ece79de10..06f6ce29c 100644 --- a/src/src/smtp_out.c +++ b/src/src/smtp_out.c @@ -3,6 +3,7 @@ *************************************************/ /* Copyright (c) University of Cambridge 1995 - 2018 */ +/* Copyright (c) The Exim Maintainers 2020 - 2021 */ /* See the file NOTICE for conditions of use and distribution. */ /* A number of functions for driving outgoing SMTP calls. */ @@ -26,7 +27,7 @@ Arguments: which case the function does nothing host_af AF_INET or AF_INET6 for the outgoing IP address addr the mail address being handled (for setting errors) - interface point this to the interface + interface point this to the interface if there is one defined msg to add to any error message Returns: TRUE on success, FALSE on failure, with error message @@ -63,13 +64,13 @@ if (is_tainted(expint)) return FALSE; } -while (isspace(*expint)) expint++; -if (*expint == 0) return TRUE; +Uskip_whitespace(&expint); +if (!*expint) return TRUE; -while ((iface = string_nextinlist(&expint, &sep, big_buffer, - big_buffer_size))) +while ((iface = string_nextinlist(&expint, &sep, NULL, 0))) { - if (string_is_ip_address(iface, NULL) == 0) + int if_af = string_is_ip_address(iface, NULL); + if (if_af == 0) { addr->transport_return = PANIC; addr->message = string_sprintf("\"%s\" is not a valid IP " @@ -78,11 +79,11 @@ while ((iface = string_nextinlist(&expint, &sep, big_buffer, return FALSE; } - if (((Ustrchr(iface, ':') == NULL)? AF_INET:AF_INET6) == host_af) + if ((if_af == 4 ? AF_INET : AF_INET6) == host_af) break; } -if (iface) *interface = string_copy(iface); +*interface = iface; return TRUE; } @@ -152,10 +153,50 @@ return TRUE; #ifdef TCP_FASTOPEN +/* Try to record if TFO was attmepted and if it was successfully used. */ + static void tfo_out_check(int sock) { -# if defined(TCP_INFO) && defined(EXIM_HAVE_TCPI_UNACKED) +static BOOL done_once = FALSE; + +if (done_once) return; +done_once = TRUE; + +# ifdef __FreeBSD__ +struct tcp_info tinfo; +socklen_t len = sizeof(tinfo); + +/* A getsockopt TCP_FASTOPEN unfortunately returns "was-used" for a TFO/R as +well as a TFO/C. Use what we can of the Linux hack below; reliability issues ditto. */ +switch (tcp_out_fastopen) + { + case TFO_ATTEMPTED_NODATA: + if ( getsockopt(sock, IPPROTO_TCP, TCP_INFO, &tinfo, &len) == 0 + && tinfo.tcpi_state == TCPS_SYN_SENT + && tinfo.__tcpi_unacked > 0 + ) + { + DEBUG(D_transport|D_v) + debug_printf("TCP_FASTOPEN tcpi_unacked %d\n", tinfo.__tcpi_unacked); + tcp_out_fastopen = TFO_USED_NODATA; + } + break; + /* + case TFO_ATTEMPTED_DATA: + case TFO_ATTEMPTED_DATA: + if (tinfo.tcpi_options & TCPI_OPT_SYN_DATA) XXX no equvalent as of 12.2 + */ + } + +switch (tcp_out_fastopen) + { + case TFO_ATTEMPTED_DATA: tcp_out_fastopen = TFO_USED_DATA; break; + default: break; /* compiler quietening */ + } + +# else /* Linux & Apple */ +# if defined(TCP_INFO) && defined(EXIM_HAVE_TCPI_UNACKED) struct tcp_info tinfo; socklen_t len = sizeof(tinfo); @@ -205,14 +246,24 @@ switch (tcp_out_fastopen) default: break; /* compiler quietening */ } -# endif +# endif +# endif /* Linux & Apple */ } #endif -/* Arguments as for smtp_connect(), plus - early_data if non-NULL, idenmpotent data to be sent - +/* Arguments: + host host item containing name and address and port + host_af AF_INET or AF_INET6 + port TCP port number + interface outgoing interface address or NULL + tb transport + timeout timeout value or 0 + early_data if non-NULL, idempotent data to be sent - preferably in the TCP SYN segment + Special case: non-NULL but with NULL blob.data - caller is + client-data-first (eg. TLS-on-connect) and a lazy-TCP-connect is + acceptable. Returns: connected socket number, or -1 with errno set */ @@ -235,7 +286,7 @@ const blob * fastopen_blob = NULL; #ifndef DISABLE_EVENT deliver_host_address = host->address; deliver_host_port = port; -if (event_raise(tb->event_action, US"tcp:connect", NULL)) return -1; +if (event_raise(tb->event_action, US"tcp:connect", NULL, &errno)) return -1; #endif if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return -1; @@ -282,23 +333,45 @@ early-data but no TFO support, send it after connecting. */ else { #ifdef TCP_FASTOPEN + /* See if TCP Fast Open usable. Default is a traditional 3WHS connect */ if (verify_check_given_host(CUSS &ob->hosts_try_fastopen, host) == OK) - fastopen_blob = early_data ? early_data : &tcp_fastopen_nodata; + { + if (!early_data) + fastopen_blob = &tcp_fastopen_nodata; /* TFO, with no data */ + else if (early_data->data) + fastopen_blob = early_data; /* TFO, with data */ +# ifdef TCP_FASTOPEN_CONNECT + else + { /* expecting client data */ + debug_printf(" set up lazy-connect\n"); + setsockopt(sock, IPPROTO_TCP, TCP_FASTOPEN_CONNECT, US &on, sizeof(on)); + /* fastopen_blob = NULL; lazy TFO, triggered by data write */ + } +# endif + } #endif if (ip_connect(sock, host_af, host->address, port, timeout, fastopen_blob) < 0) save_errno = errno; else if (early_data && !fastopen_blob && early_data->data && early_data->len) { + /* We had some early-data to send, but couldn't do TFO */ HDEBUG(D_transport|D_acl|D_v) debug_printf("sending %ld nonTFO early-data\n", (long)early_data->len); -#ifdef TCP_QUICKACK +#ifdef TCP_QUICKACK_notdef (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off)); #endif if (send(sock, early_data->data, early_data->len, 0) < 0) save_errno = errno; } +#ifdef TCP_QUICKACK_notdef + /* Under TFO (with openssl & pipe-conn; testcase 4069, as of + 5.10.8-100.fc32.x86_64) this seems to be inop. + Perhaps overwritten when we (client) go -> ESTABLISHED on seeing the 3rd-ACK? + For that case, added at smtp_reap_banner(). */ + (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off)); +#endif } /* Either bind() or connect() failed */ @@ -352,7 +425,7 @@ smtp_port_for_connect(host_item * host, int port) { if (host->port != PORT_NONE) { - HDEBUG(D_transport|D_acl|D_v) + HDEBUG(D_transport|D_acl|D_v) if (port != host->port) debug_printf_indent("Transport port=%d replaced by host-specific port=%d\n", port, host->port); port = host->port; @@ -373,6 +446,9 @@ host->address will always be an IPv4 address. Arguments: sc details for making connection: host, af, interface, transport early_data if non-NULL, data to be sent - preferably in the TCP SYN segment + Special case: non-NULL but with NULL blob.data - caller is + client-data-first (eg. TLS-on-connect) and a lazy-TCP-connect is + acceptable. Returns: connected socket number, or -1 with errno set */ @@ -451,13 +527,21 @@ flush_buffer(smtp_outblock * outblock, int mode) int rc; int n = outblock->ptr - outblock->buffer; BOOL more = mode == SCMD_MORE; +client_conn_ctx * cctx; HDEBUG(D_transport|D_acl) debug_printf_indent("cmd buf flush %d bytes%s\n", n, more ? " (more expected)" : ""); +if (!(cctx = outblock->cctx)) + { + log_write(0, LOG_MAIN|LOG_PANIC, "null conn-context pointer"); + errno = 0; + return FALSE; + } + #ifndef DISABLE_TLS -if (outblock->cctx->tls_ctx) - rc = tls_write(outblock->cctx->tls_ctx, outblock->buffer, n, more); +if (cctx->tls_ctx) /*XXX have seen a null cctx here, rvfy sending QUIT, hence check above */ + rc = tls_write(cctx->tls_ctx, outblock->buffer, n, more); else #endif @@ -471,21 +555,32 @@ else requirement: TFO with data can, in rare cases, replay the data to the receiver. */ - if ( (outblock->cctx->sock = smtp_connect(outblock->conn_args, &early_data)) + if ( (cctx->sock = smtp_connect(outblock->conn_args, &early_data)) < 0) return FALSE; outblock->conn_args = NULL; rc = n; } else - - rc = send(outblock->cctx->sock, outblock->buffer, n, + { + rc = send(cctx->sock, outblock->buffer, n, #ifdef MSG_MORE more ? MSG_MORE : 0 #else 0 #endif ); + +#if defined(__linux__) + /* This is a workaround for a current linux kernel bug: as of + 5.6.8-200.fc31.x86_64 small (sock, IPPROTO_TCP, TCP_CORK, &off, sizeof(off)); +#endif + } } if (rc <= 0) @@ -575,10 +670,12 @@ if (format) while (!isspace(*p)) p++; while (isspace(*p)) p++; } - while (*p != 0) *p++ = '*'; + while (*p) *p++ = '*'; } - HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> %s\n", big_buffer); + HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP%c> %s\n", + mode == SCMD_BUFFER ? '|' : mode == SCMD_MORE ? '+' : '>', + big_buffer); } if (mode != SCMD_BUFFER) @@ -609,7 +706,7 @@ Arguments: timelimit deadline for reading the lime, seconds past epoch Returns: length of a line that has been put in the buffer - -1 otherwise, with errno set + -1 otherwise, with errno set, and inblock->ptr adjusted */ static int @@ -650,6 +747,7 @@ for (;;) { *p = 0; /* Leave malformed line for error message */ errno = ERRNO_SMTPFORMAT; + inblock->ptr = ptr; return -1; } } @@ -675,6 +773,7 @@ for (;;) /* Get here if there has been some kind of recv() error; errno is set, but we ensure that the result buffer is empty before returning. */ +inblock->ptr = inblock->ptrend = inblock->buffer; *buffer = 0; return -1; } @@ -717,7 +816,7 @@ time_t timelimit = time(NULL) + timeout; errno = 0; /* Ensure errno starts out zero */ -#ifdef SUPPORT_PIPE_CONNECT +#ifndef DISABLE_PIPE_CONNECT if (sx->pending_BANNER || sx->pending_EHLO) { int rc; @@ -775,7 +874,7 @@ for (;;) } #ifdef TCP_FASTOPEN - tfo_out_check(sx->cctx.sock); +tfo_out_check(sx->cctx.sock); #endif /* Return a value that depends on the SMTP return code. On some systems a