From 68bf9602059968fea6bfa657fe3ff4410ad8f85f Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Mon, 10 Feb 1997 18:14:22 +0000
Subject: Initial revision

svn path=/trunk/; revision=860
---
 etrn.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 etrn.c

diff --git a/etrn.c b/etrn.c
new file mode 100644
index 00000000..5f54eebe
--- /dev/null
+++ b/etrn.c
@@ -0,0 +1,133 @@
+/*
+ * etrn.c -- ETRN protocol methods
+ *
+ * For license terms, see the file COPYING in this directory.
+ */
+
+#include  <config.h>
+#include  <stdio.h>
+#include  "fetchmail.h"
+#include  "smtp.h"
+#include  "socket.h"
+
+static int etrn_ok (FILE *sockfp, char *argbuf)
+/* parse command response */
+{
+    int ok;
+    char buf [POPBUFSIZE+1];
+
+    ok = SMTP_ok(sockfp);
+    if (ok == SM_UNRECOVERABLE)
+	return(PS_PROTOCOL);
+    else
+	return(ok);
+}
+
+static int etrn_getrange(FILE *sockfp, struct query *ctl, int*countp, int*newp)
+/* send ETRN and interpret the response */
+{
+    int ok, opts;
+    char buf [POPBUFSIZE+1];
+
+    if ((ok = SMTP_ehlo(sockfp, ctl->server.names->id, &opts)))
+    {
+	error(0, 0, "%s's SMTP listener does not support ESMTP",
+	      ctl->server.names->id);
+	return(ok);
+    }
+    else if (!(opts & ESMTP_ETRN))
+    {
+	error(0, 0, "%s's SMTP listener does not support ETRN",
+	      ctl->server.names->id);
+	return(PS_PROTOCOL);
+    }
+
+    *countp = *newp = -1;	/* make sure we don't enter the fetch loop */
+
+    /* ship the actual poll and get the response */
+    gen_send(sockfp, "ETRN %s", ctl->server.names->id);
+    if (ok = gen_recv(sockfp, buf, sizeof(buf)))
+	return(ok);
+
+    /* this switch includes all the response codes described in RFC1985 */
+    switch(atoi(buf))
+    {
+    case 250:	/* OK, queuing for node <x> started */
+	error(0, 0, "Queuing for %s started", ctl->server.names->id);
+	break;
+
+    case 251:	/* OK, no messages waiting for node <x> */
+	error(0, 0, "No messages waiting for %s", ctl->server.names->id);
+	return(PS_NOMAIL);
+
+    case 252:	/* OK, pending messages for node <x> started */
+    case 253:	/* OK, <n> pending messages for node <x> started */
+	error(0, 0, "Pending messages for %s started");
+	break;
+
+    case 458:	/* Unable to queue messages for node <x> */
+	error(0, 0, "Unable to queue messages for node %s",
+	      ctl->server.names->id);
+	return(PS_PROTOCOL);
+
+    case 459:	/* Node <x> not allowed: <reason> */
+	error(0, 0, "Node %s not allowed: %s", ctl->server.names->id, buf);
+	return(PS_AUTHFAIL);
+
+    case 500:	/* Syntax Error */
+	error(0, 0, "ETRN syntax error");
+	return(PS_PROTOCOL);
+
+    case 501:	/* Syntax Error in Parameters */
+	error(0, 0, "ETRN syntax error in parameters");
+	return(PS_PROTOCOL);
+
+    default:
+	error(0, 0, "Unknown ETRN error");
+	return(PS_PROTOCOL);
+    }
+
+    return(0);
+}
+
+const static struct method etrn =
+{
+    "ETRN",		/* ESMTP ETRN extension */
+    25,			/* standard SMTP port */
+    FALSE,		/* this is not a tagged protocol */
+    FALSE,		/* this does not use a message delimiter */
+    etrn_ok,		/* parse command response */
+    NULL,		/* no need to get authentication */
+    etrn_getrange,	/* initialize message sending */
+    NULL,		/* we cannot get a list of sizes */
+    NULL,		/* how do we tell a message is old? */
+    NULL,		/* request given message */
+    NULL,		/* no message trailer */
+    NULL,		/* how to delete a message */
+    "QUIT",		/* the ETRN exit command */
+};
+
+int doETRN (struct query *ctl)
+/* retrieve messages using ETRN */
+{
+    if (ctl->keep) {
+	fprintf(stderr, "Option --keep is not supported with ETRN\n");
+	return(PS_SYNTAX);
+    }
+    if (ctl->flush) {
+	fprintf(stderr, "Option --flush is not supported with ETRN\n");
+	return(PS_SYNTAX);
+    }
+    if (ctl->mailbox) {
+	fprintf(stderr, "Option --remote is not supported with ETRN\n");
+	return(PS_SYNTAX);
+    }
+    if (check_only) {
+	fprintf(stderr, "Option --check is not supported with ETRN\n");
+	return(PS_SYNTAX);
+    }
+    peek_capable = FALSE;
+    return(do_protocol(ctl, &etrn));
+}
+
+/* etrn.c ends here */
-- 
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