--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pop3d.h	Tue Apr 01 20:19:43 2014 +0500
@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2014 Sunil Nimmagadda <sunil@nimmagadda.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/tree.h>
+
+#include <sha1.h>
+
+#include "imsgev.h"
+#include "iobuf.h"
+#include "ioev.h"
+
+#define	ARGLEN		40
+#define POP3S		0x01
+#define	F_DELE		0x01
+
+struct passwd;
+
+enum imsg_type {
+	IMSG_AUTH,
+	IMSG_MAILDROP_INIT,
+	IMSG_MAILDROP_RETR,
+	IMSG_MAILDROP_DELE,
+	IMSG_MAILDROP_RSET,
+	IMSG_MAILDROP_LIST,
+	IMSG_MAILDROP_LISTALL,
+	IMSG_MAILDROP_UIDLALL,
+	IMSG_MAILDROP_UPDATE
+};
+
+enum m_type {
+	M_MBOX,
+	M_MAILDIR
+};
+
+struct msg {
+	union {
+		SIMPLEQ_ENTRY(msg)	q_entry;
+		RB_ENTRY(msg)		t_entry;
+	}				e;
+	char				hash[SHA1_DIGEST_STRING_LENGTH];
+	size_t				sz;
+	size_t				nlines;
+	union {
+		long			offset;
+		const char		*fname;
+	}				u;
+	int				flags;
+};
+
+struct mdrop {
+	union {
+		SIMPLEQ_HEAD(, msg)	q_msgs;
+		RB_HEAD(msgtree, msg)	t_msgs;
+	}				e;
+	size_t				nmsgs;
+	size_t				sz;
+	struct msg			**msgs_index; /* random access to msgs */
+	int				fd;
+};
+
+struct stats {
+	size_t	nmsgs;
+	size_t	sz;
+};
+
+struct retr_req {
+	unsigned int	idx;
+	unsigned int	ntop;
+	int		top;
+};
+
+struct retr_res {
+	size_t		nlines;
+	long		offset;
+	unsigned int	ntop;
+	int		top;
+};
+
+struct list_req {
+	unsigned int	idx;
+	int		uidl;
+};
+
+struct list_res {
+	unsigned int	idx;
+	union {
+		size_t	sz;
+		char	hash[SHA1_DIGEST_STRING_LENGTH];
+	}		u;
+	int		uidl;
+};
+
+struct m_backend {
+	int (*init)(struct mdrop *, size_t *, size_t *);
+	int (*retr)(struct mdrop *, unsigned int, size_t *, size_t *);
+	int (*update)(struct mdrop *);
+};
+
+struct auth_req {
+	char	user[ARGLEN];
+	char	pass[ARGLEN];
+};
+
+struct listener {
+	struct sockaddr_storage	ss;
+	struct event		ev;
+	struct event		pause;
+	int			flags;
+	int			sock;
+};
+
+enum state {
+	AUTH,
+	TRANSACTION,
+	UPDATE
+};
+
+struct session {
+	SPLAY_ENTRY(session)	entry;
+	struct imsgev		iev_maildrop;
+	struct iobuf		iobuf;
+	struct io		io;
+	char			user[ARGLEN];
+	char			pass[ARGLEN];
+	size_t			m_sz;
+	size_t			nmsgs;
+	struct listener		*l;
+	uint32_t		id;
+	int			sock;
+	int			flags;
+	enum state		state;
+};
+
+/* pop3e.c */
+pid_t pop3_main(int [2], struct passwd *);
+
+/* session.c */
+void session_init(struct listener *, int);
+void session_close(struct session *, int);
+void session_reply(struct session *, char *, ...);
+void session_set_state(struct session *, enum state);
+void session_imsgev_init(struct session *, int);
+SPLAY_HEAD(session_tree, session);
+int session_cmp(struct session *, struct session *);
+SPLAY_PROTOTYPE(session_tree, session, entry, session_cmp);
+
+/* maildrop.c */
+pid_t maildrop_init(uint32_t, int [2], struct passwd *, int, const char *);
+
+/* util.c */
+void set_nonblocking(int);
+void log_init(int);
+void logit(int, const char *, ...);
+void vlog(int, const char *, va_list);
+void fatal(const char *);
+void fatalx(const char *);
+void *xcalloc(size_t, size_t, const char *);
+void iobuf_xfqueue(struct iobuf *, const char *, const char *, ...);
+void iobuf_xqueue(struct iobuf *, const char *, const void *, size_t);
+int imsgev_xcompose(struct imsgev *, u_int16_t, u_int32_t,
+    uint32_t, int, void *, u_int16_t, const char *);
+int get_index(struct session *, const char *, unsigned int *);
+void log_connect(uint32_t, struct sockaddr_storage *, socklen_t);