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/*
* git-imap-send - drops patches into an imap Drafts folder
* derived from isync/mbsync - mailbox synchronizer
*
* Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
* Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
* Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
* Copyright (C) 2006 Mike McCormack
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

#include "cache.h"
#include "exec_cmd.h"
#include "run-command.h"
#include "prompt.h"
#ifdef NO_OPENSSL
typedef void *SSL;
#else
#include <openssl/evp.h>
#include <openssl/hmac.h>
#endif

struct store_conf {
char *name;
const char *path; /* should this be here? its interpretation is driver-specific */
char *map_inbox;
char *trash;
unsigned max_size; /* off_t is overkill */
unsigned trash_remote_new:1, trash_only_new:1;
};

/* For message->status */
#define M_RECENT (1<<0) /* unsyncable flag; maildir_* depend on this being 1<<0 */
#define M_DEAD (1<<1) /* expunged */
#define M_FLAGS (1<<2) /* flags fetched */

struct message {
struct message *next;
size_t size; /* zero implies "not fetched" */
int uid;
unsigned char flags, status;
};

struct store {
struct store_conf *conf; /* foreign */

/* currently open mailbox */
const char *name; /* foreign! maybe preset? */
char *path; /* own */
struct message *msgs; /* own */
int uidvalidity;
unsigned char opts; /* maybe preset? */
/* note that the following do _not_ reflect stats from msgs, but mailbox totals */
int count; /* # of messages */
int recent; /* # of recent messages - don't trust this beyond the initial read */
};

struct msg_data {
char *data;
int len;
unsigned char flags;
};

static const char imap_send_usage[] = "git imap-send < <mbox>";

#undef DRV_OK
#define DRV_OK 0
#define DRV_MSG_BAD -1
#define DRV_BOX_BAD -2
#define DRV_STORE_BAD -3

static int Verbose, Quiet;

__attribute__((format (printf, 1, 2)))
static void imap_info(const char *, ...);
__attribute__((format (printf, 1, 2)))
static void imap_warn(const char *, ...);

static char *next_arg(char **);

static void free_generic_messages(struct message *);

__attribute__((format (printf, 3, 4)))
static int nfsnprintf(char *buf, int blen, const char *fmt, ...);

static int nfvasprintf(char **strp, const char *fmt, va_list ap)
{
int len;
char tmp[8192];

len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
if (len < 0)
die("Fatal: Out of memory");
if (len >= sizeof(tmp))
die("imap command overflow!");
*strp = xmemdupz(tmp, len);
return len;
}

struct imap_server_conf {
char *name;
char *tunnel;
char *host;
int port;
char *user;
char *pass;
int use_ssl;
int ssl_verify;
int use_html;
char *auth_method;
};

static struct imap_server_conf server = {
NULL, /* name */
NULL, /* tunnel */
NULL, /* host */
0, /* port */
NULL, /* user */
NULL, /* pass */
0, /* use_ssl */
1, /* ssl_verify */
0, /* use_html */
NULL, /* auth_method */
};

struct imap_store_conf {
struct store_conf gen;
struct imap_server_conf *server;
};

#define NIL (void *)0x1
#define LIST (void *)0x2

struct imap_list {
struct imap_list *next, *child;
char *val;
int len;
};

struct imap_socket {
int fd[2];
SSL *ssl;
};

struct imap_buffer {
struct imap_socket sock;
int bytes;
int offset;
char buf[1024];
};

struct imap_cmd;

struct imap {
int uidnext; /* from SELECT responses */
struct imap_list *ns_personal, *ns_other, *ns_shared; /* NAMESPACE info */
unsigned caps, rcaps; /* CAPABILITY results */
/* command queue */
int nexttag, num_in_progress, literal_pending;
struct imap_cmd *in_progress, **in_progress_append;
struct imap_buffer buf; /* this is BIG, so put it last */
};

struct imap_store {
struct store gen;
int uidvalidity;
struct imap *imap;
const char *prefix;
unsigned /*currentnc:1,*/ trashnc:1;
};

struct imap_cmd_cb {
int (*cont)(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt);
void (*done)(struct imap_store *ctx, struct imap_cmd *cmd, int response);
void *ctx;
char *data;
int dlen;
int uid;
unsigned create:1, trycreate:1;
};

struct imap_cmd {
struct imap_cmd *next;
struct imap_cmd_cb cb;
char *cmd;
int tag;
};

#define CAP(cap) (imap->caps & (1 << (cap)))

enum CAPABILITY {
NOLOGIN = 0,
UIDPLUS,
LITERALPLUS,
NAMESPACE,
STARTTLS,
AUTH_CRAM_MD5
};

static const char *cap_list[] = {
"LOGINDISABLED",
"UIDPLUS",
"LITERAL+",
"NAMESPACE",
"STARTTLS",
"AUTH=CRAM-MD5",
};

#define RESP_OK 0
#define RESP_NO 1
#define RESP_BAD 2

static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);


static const char *Flags[] = {
"Draft",
"Flagged",
"Answered",
"Seen",
"Deleted",
};

#ifndef NO_OPENSSL
static void ssl_socket_perror(const char *func)
{
fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
}
#endif

static void socket_perror(const char *func, struct imap_socket *sock, int ret)
{
#ifndef NO_OPENSSL
if (sock->ssl) {
int sslerr = SSL_get_error(sock->ssl, ret);
switch (sslerr) {
case SSL_ERROR_NONE:
break;
case SSL_ERROR_SYSCALL:
perror("SSL_connect");
break;
default:
ssl_socket_perror("SSL_connect");
break;
}
} else
#endif
{
if (ret < 0)
perror(func);
else
fprintf(stderr, "%s: unexpected EOF\n", func);
}
}

static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
{
#ifdef NO_OPENSSL
fprintf(stderr, "SSL requested but SSL support not compiled in\n");
return -1;
#else
#if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
const SSL_METHOD *meth;
#else
SSL_METHOD *meth;
#endif
SSL_CTX *ctx;
int ret;

SSL_library_init();
SSL_load_error_strings();

if (use_tls_only)
meth = TLSv1_method();
else
meth = SSLv23_method();

if (!meth) {
ssl_socket_perror("SSLv23_method");
return -1;
}

ctx = SSL_CTX_new(meth);

if (verify)
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);

if (!SSL_CTX_set_default_verify_paths(ctx)) {
ssl_socket_perror("SSL_CTX_set_default_verify_paths");
return -1;
}
sock->ssl = SSL_new(ctx);
if (!sock->ssl) {
ssl_socket_perror("SSL_new");
return -1;
}
if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
ssl_socket_perror("SSL_set_rfd");
return -1;
}
if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
ssl_socket_perror("SSL_set_wfd");
return -1;
}

ret = SSL_connect(sock->ssl);
if (ret <= 0) {
socket_perror("SSL_connect", sock, ret);
return -1;
}

return 0;
#endif
}

static int socket_read(struct imap_socket *sock, char *buf, int len)
{
ssize_t n;
#ifndef NO_OPENSSL
if (sock->ssl)
n = SSL_read(sock->ssl, buf, len);
else
#endif
n = xread(sock->fd[0], buf, len);
if (n <= 0) {
socket_perror("read", sock, n);
close(sock->fd[0]);
close(sock->fd[1]);
sock->fd[0] = sock->fd[1] = -1;
}
return n;
}

static int socket_write(struct imap_socket *sock, const char *buf, int len)
{
int n;
#ifndef NO_OPENSSL
if (sock->ssl)
n = SSL_write(sock->ssl, buf, len);
else
#endif
n = write_in_full(sock->fd[1], buf, len);
if (n != len) {
socket_perror("write", sock, n);
close(sock->fd[0]);
close(sock->fd[1]);
sock->fd[0] = sock->fd[1] = -1;
}
return n;
}

static void socket_shutdown(struct imap_socket *sock)
{
#ifndef NO_OPENSSL
if (sock->ssl) {
SSL_shutdown(sock->ssl);
SSL_free(sock->ssl);
}
#endif
close(sock->fd[0]);
close(sock->fd[1]);
}

/* simple line buffering */
static int buffer_gets(struct imap_buffer *b, char **s)
{
int n;
int start = b->offset;

*s = b->buf + start;

for (;;) {
/* make sure we have enough data to read the \r\n sequence */
if (b->offset + 1 >= b->bytes) {
if (start) {
/* shift down used bytes */
*s = b->buf;

assert(start <= b->bytes);
n = b->bytes - start;

if (n)
memmove(b->buf, b->buf + start, n);
b->offset -= start;
b->bytes = n;
start = 0;
}

n = socket_read(&b->sock, b->buf + b->bytes,
sizeof(b->buf) - b->bytes);

if (n <= 0)
return -1;

b->bytes += n;
}

if (b->buf[b->offset] == '\r') {
assert(b->offset + 1 < b->bytes);
if (b->buf[b->offset + 1] == '\n') {
b->buf[b->offset] = 0; /* terminate the string */
b->offset += 2; /* next line */
if (Verbose)
puts(*s);
return 0;
}
}

b->offset++;
}
/* not reached */
}

static void imap_info(const char *msg, ...)
{
va_list va;

if (!Quiet) {
va_start(va, msg);
vprintf(msg, va);
va_end(va);
fflush(stdout);
}
}

static void imap_warn(const char *msg, ...)
{
va_list va;

if (Quiet < 2) {
va_start(va, msg);
vfprintf(stderr, msg, va);
va_end(va);
}
}

static char *next_arg(char **s)
{
char *ret;

if (!s || !*s)
return NULL;
while (isspace((unsigned char) **s))
(*s)++;
if (!**s) {
*s = NULL;
return NULL;
}
if (**s == '"') {
++*s;
ret = *s;
*s = strchr(*s, '"');
} else {
ret = *s;
while (**s && !isspace((unsigned char) **s))
(*s)++;
}
if (*s) {
if (**s)
*(*s)++ = 0;
if (!**s)
*s = NULL;
}
return ret;
}

static void free_generic_messages(struct message *msgs)
{
struct message *tmsg;

for (; msgs; msgs = tmsg) {
tmsg = msgs->next;
free(msgs);
}
}

static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
{
int ret;
va_list va;

va_start(va, fmt);
if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
die("Fatal: buffer too small. Please report a bug.");
va_end(va);
return ret;
}

static struct imap_cmd *v_issue_imap_cmd(struct imap_store *ctx,
struct imap_cmd_cb *cb,
const char *fmt, va_list ap)
{
struct imap *imap = ctx->imap;
struct imap_cmd *cmd;
int n, bufl;
char buf[1024];

cmd = xmalloc(sizeof(struct imap_cmd));
nfvasprintf(&cmd->cmd, fmt, ap);
cmd->tag = ++imap->nexttag;

if (cb)
cmd->cb = *cb;
else
memset(&cmd->cb, 0, sizeof(cmd->cb));

while (imap->literal_pending)
get_cmd_result(ctx, NULL);

if (!cmd->cb.data)
bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
else
bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
cmd->tag, cmd->cmd, cmd->cb.dlen,
CAP(LITERALPLUS) ? "+" : "");

if (Verbose) {
if (imap->num_in_progress)
printf("(%d in progress) ", imap->num_in_progress);
if (memcmp(cmd->cmd, "LOGIN", 5))
printf(">>> %s", buf);
else
printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
}
if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
free(cmd->cmd);
free(cmd);
if (cb)
free(cb->data);
return NULL;
}
if (cmd->cb.data) {
if (CAP(LITERALPLUS)) {
n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
free(cmd->cb.data);
if (n != cmd->cb.dlen ||
socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
free(cmd->cmd);
free(cmd);
return NULL;
}
cmd->cb.data = NULL;
} else
imap->literal_pending = 1;
} else if (cmd->cb.cont)
imap->literal_pending = 1;
cmd->next = NULL;
*imap->in_progress_append = cmd;
imap->in_progress_append = &cmd->next;
imap->num_in_progress++;
return cmd;
}

__attribute__((format (printf, 3, 4)))
static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
struct imap_cmd_cb *cb,
const char *fmt, ...)
{
struct imap_cmd *ret;
va_list ap;

va_start(ap, fmt);
ret = v_issue_imap_cmd(ctx, cb, fmt, ap);
va_end(ap);
return ret;
}

__attribute__((format (printf, 3, 4)))
static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
const char *fmt, ...)
{
va_list ap;
struct imap_cmd *cmdp;

va_start(ap, fmt);
cmdp = v_issue_imap_cmd(ctx, cb, fmt, ap);
va_end(ap);
if (!cmdp)
return RESP_BAD;

return get_cmd_result(ctx, cmdp);
}

__attribute__((format (printf, 3, 4)))
static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
const char *fmt, ...)
{
va_list ap;
struct imap_cmd *cmdp;

va_start(ap, fmt);
cmdp = v_issue_imap_cmd(ctx, cb, fmt, ap);
va_end(ap);
if (!cmdp)
return DRV_STORE_BAD;

switch (get_cmd_result(ctx, cmdp)) {
case RESP_BAD: return DRV_STORE_BAD;
case RESP_NO: return DRV_MSG_BAD;
default: return DRV_OK;
}
}

static int is_atom(struct imap_list *list)
{
return list && list->val && list->val != NIL && list->val != LIST;
}

static int is_list(struct imap_list *list)
{
return list && list->val == LIST;
}

static void free_list(struct imap_list *list)
{
struct imap_list *tmp;

for (; list; list = tmp) {
tmp = list->next;
if (is_list(list))
free_list(list->child);
else if (is_atom(list))
free(list->val);
free(list);
}
}

static int parse_imap_list_l(struct imap *imap, char **sp, struct imap_list **curp, int level)
{
struct imap_list *cur;
char *s = *sp, *p;
int n, bytes;

for (;;) {
while (isspace((unsigned char)*s))
s++;
if (level && *s == ')') {
s++;
break;
}
*curp = cur = xmalloc(sizeof(*cur));
curp = &cur->next;
cur->val = NULL; /* for clean bail */
if (*s == '(') {
/* sublist */
s++;
cur->val = LIST;
if (parse_imap_list_l(imap, &s, &cur->child, level + 1))
goto bail;
} else if (imap && *s == '{') {
/* literal */
bytes = cur->len = strtol(s + 1, &s, 10);
if (*s != '}')
goto bail;

s = cur->val = xmalloc(cur->len);

/* dump whats left over in the input buffer */
n = imap->buf.bytes - imap->buf.offset;

if (n > bytes)
/* the entire message fit in the buffer */
n = bytes;

memcpy(s, imap->buf.buf + imap->buf.offset, n);
s += n;
bytes -= n;

/* mark that we used part of the buffer */
imap->buf.offset += n;

/* now read the rest of the message */
while (bytes > 0) {
if ((n = socket_read(&imap->buf.sock, s, bytes)) <= 0)
goto bail;
s += n;
bytes -= n;
}

if (buffer_gets(&imap->buf, &s))
goto bail;
} else if (*s == '"') {
/* quoted string */
s++;
p = s;
for (; *s != '"'; s++)
if (!*s)
goto bail;
cur->len = s - p;
s++;
cur->val = xmemdupz(p, cur->len);
} else {
/* atom */
p = s;
for (; *s && !isspace((unsigned char)*s); s++)
if (level && *s == ')')
break;
cur->len = s - p;
if (cur->len == 3 && !memcmp("NIL", p, 3))
cur->val = NIL;
else
cur->val = xmemdupz(p, cur->len);
}

if (!level)
break;
if (!*s)
goto bail;
}
*sp = s;
*curp = NULL;
return 0;

bail:
*curp = NULL;
return -1;
}

static struct imap_list *parse_imap_list(struct imap *imap, char **sp)
{
struct imap_list *head;

if (!parse_imap_list_l(imap, sp, &head, 0))
return head;
free_list(head);
return NULL;
}

static struct imap_list *parse_list(char **sp)
{
return parse_imap_list(NULL, sp);
}

static void parse_capability(struct imap *imap, char *cmd)
{
char *arg;
unsigned i;

imap->caps = 0x80000000;
while ((arg = next_arg(&cmd)))
for (i = 0; i < ARRAY_SIZE(cap_list); i++)
if (!strcmp(cap_list[i], arg))
imap->caps |= 1 << i;
imap->rcaps = imap->caps;
}

static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
char *s)
{
struct imap *imap = ctx->imap;
char *arg, *p;

if (*s != '[')
return RESP_OK; /* no response code */
s++;
if (!(p = strchr(s, ']'))) {
fprintf(stderr, "IMAP error: malformed response code\n");
return RESP_BAD;
}
*p++ = 0;
arg = next_arg(&s);
if (!strcmp("UIDVALIDITY", arg)) {
if (!(arg = next_arg(&s)) || !(ctx->gen.uidvalidity = atoi(arg))) {
fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
return RESP_BAD;
}
} else if (!strcmp("UIDNEXT", arg)) {
if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
return RESP_BAD;
}
} else if (!strcmp("CAPABILITY", arg)) {
parse_capability(imap, s);
} else if (!strcmp("ALERT", arg)) {
/* RFC2060 says that these messages MUST be displayed
* to the user
*/
for (; isspace((unsigned char)*p); p++);
fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
} else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
if (!(arg = next_arg(&s)) || !(ctx->gen.uidvalidity = atoi(arg)) ||
!(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
return RESP_BAD;
}
}
return RESP_OK;
}

static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
{
struct imap *imap = ctx->imap;
struct imap_cmd *cmdp, **pcmdp, *ncmdp;
char *cmd, *arg, *arg1, *p;
int n, resp, resp2, tag;

for (;;) {
if (buffer_gets(&imap->buf, &cmd))
return RESP_BAD;

arg = next_arg(&cmd);
if (*arg == '*') {
arg = next_arg(&cmd);
if (!arg) {
fprintf(stderr, "IMAP error: unable to parse untagged response\n");
return RESP_BAD;
}

if (!strcmp("NAMESPACE", arg)) {
imap->ns_personal = parse_list(&cmd);
imap->ns_other = parse_list(&cmd);
imap->ns_shared = parse_list(&cmd);
} else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
!strcmp("NO", arg) || !strcmp("BYE", arg)) {
if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
return resp;
} else if (!strcmp("CAPABILITY", arg))
parse_capability(imap, cmd);
else if ((arg1 = next_arg(&cmd))) {
if (!strcmp("EXISTS", arg1))
ctx->gen.count = atoi(arg);
else if (!strcmp("RECENT", arg1))
ctx->gen.recent = atoi(arg);
} else {
fprintf(stderr, "IMAP error: unable to parse untagged response\n");
return RESP_BAD;
}
} else if (!imap->in_progress) {
fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
return RESP_BAD;
} else if (*arg == '+') {
/* This can happen only with the last command underway, as
it enforces a round-trip. */
cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
offsetof(struct imap_cmd, next));
if (cmdp->cb.data) {
n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
free(cmdp->cb.data);
cmdp->cb.data = NULL;
if (n != (int)cmdp->cb.dlen)
return RESP_BAD;
} else if (cmdp->cb.cont) {
if (cmdp->cb.cont(ctx, cmdp, cmd))
return RESP_BAD;
} else {
fprintf(stderr, "IMAP error: unexpected command continuation request\n");
return RESP_BAD;
}
if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
return RESP_BAD;
if (!cmdp->cb.cont)
imap->literal_pending = 0;
if (!tcmd)
return DRV_OK;
} else {
tag = atoi(arg);
for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
if (cmdp->tag == tag)
goto gottag;
fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
return RESP_BAD;
gottag:
if (!(*pcmdp = cmdp->next))
imap->in_progress_append = pcmdp;
imap->num_in_progress--;
if (cmdp->cb.cont || cmdp->cb.data)
imap->literal_pending = 0;
arg = next_arg(&cmd);
if (!strcmp("OK", arg))
resp = DRV_OK;
else {
if (!strcmp("NO", arg)) {
if (cmdp->cb.create && cmd && (cmdp->cb.trycreate || !memcmp(cmd, "[TRYCREATE]", 11))) { /* SELECT, APPEND or UID COPY */
p = strchr(cmdp->cmd, '"');
if (!issue_imap_cmd(ctx, NULL, "CREATE \"%.*s\"", (int)(strchr(p + 1, '"') - p + 1), p)) {
resp = RESP_BAD;
goto normal;
}
/* not waiting here violates the spec, but a server that does not
grok this nonetheless violates it too. */
cmdp->cb.create = 0;
if (!(ncmdp = issue_imap_cmd(ctx, &cmdp->cb, "%s", cmdp->cmd))) {
resp = RESP_BAD;
goto normal;
}
free(cmdp->cmd);
free(cmdp);
if (!tcmd)
return 0; /* ignored */
if (cmdp == tcmd)
tcmd = ncmdp;
continue;
}
resp = RESP_NO;
} else /*if (!strcmp("BAD", arg))*/
resp = RESP_BAD;
fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
memcmp(cmdp->cmd, "LOGIN", 5) ?
cmdp->cmd : "LOGIN <user> <pass>",
arg, cmd ? cmd : "");
}
if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
resp = resp2;
normal:
if (cmdp->cb.done)
cmdp->cb.done(ctx, cmdp, resp);
free(cmdp->cb.data);
free(cmdp->cmd);
free(cmdp);
if (!tcmd || tcmd == cmdp)
return resp;
}
}
/* not reached */
}

static void imap_close_server(struct imap_store *ictx)
{
struct imap *imap = ictx->imap;

if (imap->buf.sock.fd[0] != -1) {
imap_exec(ictx, NULL, "LOGOUT");
socket_shutdown(&imap->buf.sock);
}
free_list(imap->ns_personal);
free_list(imap->ns_other);
free_list(imap->ns_shared);
free(imap);
}

static void imap_close_store(struct store *ctx)
{
imap_close_server((struct imap_store *)ctx);
free_generic_messages(ctx->msgs);
free(ctx);
}

#ifndef NO_OPENSSL

/*
* hexchar() and cram() functions are based on the code from the isync
* project (http://isync.sf.net/).
*/
static char hexchar(unsigned int b)
{
return b < 10 ? '0' + b : 'a' + (b - 10);
}

#define ENCODED_SIZE(n) (4*((n+2)/3))
static char *cram(const char *challenge_64, const char *user, const char *pass)
{
int i, resp_len, encoded_len, decoded_len;
HMAC_CTX hmac;
unsigned char hash[16];
char hex[33];
char *response, *response_64, *challenge;

/*
* length of challenge_64 (i.e. base-64 encoded string) is a good
* enough upper bound for challenge (decoded result).
*/
encoded_len = strlen(challenge_64);
challenge = xmalloc(encoded_len);
decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
(unsigned char *)challenge_64, encoded_len);
if (decoded_len < 0)
die("invalid challenge %s", challenge_64);
HMAC_Init(&hmac, (unsigned char *)pass, strlen(pass), EVP_md5());
HMAC_Update(&hmac, (unsigned char *)challenge, decoded_len);
HMAC_Final(&hmac, hash, NULL);
HMAC_CTX_cleanup(&hmac);

hex[32] = 0;
for (i = 0; i < 16; i++) {
hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
hex[2 * i + 1] = hexchar(hash[i] & 0xf);
}

/* response: "<user> <digest in hex>" */
resp_len = strlen(user) + 1 + strlen(hex) + 1;
response = xmalloc(resp_len);
sprintf(response, "%s %s", user, hex);

response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
(unsigned char *)response, resp_len);
if (encoded_len < 0)
die("EVP_EncodeBlock error");
response_64[encoded_len] = '\0';
return (char *)response_64;
}

#else

static char *cram(const char *challenge_64, const char *user, const char *pass)
{
die("If you want to use CRAM-MD5 authenticate method, "
"you have to build git-imap-send with OpenSSL library.");
}

#endif

static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
{
int ret;
char *response;

response = cram(prompt, server.user, server.pass);

ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
if (ret != strlen(response))
return error("IMAP error: sending response failed");

free(response);

return 0;
}

static struct store *imap_open_store(struct imap_server_conf *srvc)
{
struct imap_store *ctx;
struct imap *imap;
char *arg, *rsp;
int s = -1, preauth;

ctx = xcalloc(sizeof(*ctx), 1);

ctx->imap = imap = xcalloc(sizeof(*imap), 1);
imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
imap->in_progress_append = &imap->in_progress;

/* open connection to IMAP server */

if (srvc->tunnel) {
const char *argv[] = { srvc->tunnel, NULL };
struct child_process tunnel = {NULL};

imap_info("Starting tunnel '%s'... ", srvc->tunnel);

tunnel.argv = argv;
tunnel.use_shell = 1;
tunnel.in = -1;
tunnel.out = -1;
if (start_command(&tunnel))
die("cannot start proxy %s", argv[0]);

imap->buf.sock.fd[0] = tunnel.out;
imap->buf.sock.fd[1] = tunnel.in;

imap_info("ok\n");
} else {
#ifndef NO_IPV6
struct addrinfo hints, *ai0, *ai;
int gai;
char portstr[6];

snprintf(portstr, sizeof(portstr), "%d", srvc->port);

memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;

imap_info("Resolving %s... ", srvc->host);
gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
if (gai) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
goto bail;
}
imap_info("ok\n");

for (ai0 = ai; ai; ai = ai->ai_next) {
char addr[NI_MAXHOST];

s = socket(ai->ai_family, ai->ai_socktype,
ai->ai_protocol);
if (s < 0)
continue;

getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
sizeof(addr), NULL, 0, NI_NUMERICHOST);
imap_info("Connecting to [%s]:%s... ", addr, portstr);

if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
close(s);
s = -1;
perror("connect");
continue;
}

break;
}
freeaddrinfo(ai0);
#else /* NO_IPV6 */
struct hostent *he;
struct sockaddr_in addr;

memset(&addr, 0, sizeof(addr));
addr.sin_port = htons(srvc->port);
addr.sin_family = AF_INET;

imap_info("Resolving %s... ", srvc->host);
he = gethostbyname(srvc->host);
if (!he) {
perror("gethostbyname");
goto bail;
}
imap_info("ok\n");

addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);

s = socket(PF_INET, SOCK_STREAM, 0);

imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
close(s);
s = -1;
perror("connect");
}
#endif
if (s < 0) {
fputs("Error: unable to connect to server.\n", stderr);
goto bail;
}

imap->buf.sock.fd[0] = s;
imap->buf.sock.fd[1] = dup(s);

if (srvc->use_ssl &&
ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
close(s);
goto bail;
}
imap_info("ok\n");
}

/* read the greeting string */
if (buffer_gets(&imap->buf, &rsp)) {
fprintf(stderr, "IMAP error: no greeting response\n");
goto bail;
}
arg = next_arg(&rsp);
if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
fprintf(stderr, "IMAP error: invalid greeting response\n");
goto bail;
}
preauth = 0;
if (!strcmp("PREAUTH", arg))
preauth = 1;
else if (strcmp("OK", arg) != 0) {
fprintf(stderr, "IMAP error: unknown greeting response\n");
goto bail;
}
parse_response_code(ctx, NULL, rsp);
if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
goto bail;

if (!preauth) {
#ifndef NO_OPENSSL
if (!srvc->use_ssl && CAP(STARTTLS)) {
if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
goto bail;
if (ssl_socket_connect(&imap->buf.sock, 1,
srvc->ssl_verify))
goto bail;
/* capabilities may have changed, so get the new capabilities */
if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
goto bail;
}
#endif
imap_info("Logging in...\n");
if (!srvc->user) {
fprintf(stderr, "Skipping server %s, no user\n", srvc->host);
goto bail;
}
if (!srvc->pass) {
struct strbuf prompt = STRBUF_INIT;
strbuf_addf(&prompt, "Password (%s@%s): ", srvc->user, srvc->host);
arg = git_getpass(prompt.buf);
strbuf_release(&prompt);
if (!*arg) {
fprintf(stderr, "Skipping account %s@%s, no password\n", srvc->user, srvc->host);
goto bail;
}
/*
* getpass() returns a pointer to a static buffer. make a copy
* for long term storage.
*/
srvc->pass = xstrdup(arg);
}
if (CAP(NOLOGIN)) {
fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host);
goto bail;
}

if (srvc->auth_method) {
struct imap_cmd_cb cb;

if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
if (!CAP(AUTH_CRAM_MD5)) {
fprintf(stderr, "You specified"
"CRAM-MD5 as authentication method, "
"but %s doesn't support it.\n", srvc->host);
goto bail;
}
/* CRAM-MD5 */

memset(&cb, 0, sizeof(cb));
cb.cont = auth_cram_md5;
if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
goto bail;
}
} else {
fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
goto bail;
}
} else {
if (!imap->buf.sock.ssl)
imap_warn("*** IMAP Warning *** Password is being "
"sent in the clear\n");
if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
fprintf(stderr, "IMAP error: LOGIN failed\n");
goto bail;
}
}
} /* !preauth */

ctx->prefix = "";
ctx->trashnc = 1;
return (struct store *)ctx;

bail:
imap_close_store(&ctx->gen);
return NULL;
}

static int imap_make_flags(int flags, char *buf)
{
const char *s;
unsigned i, d;

for (i = d = 0; i < ARRAY_SIZE(Flags); i++)
if (flags & (1 << i)) {
buf[d++] = ' ';
buf[d++] = '\\';
for (s = Flags[i]; *s; s++)
buf[d++] = *s;
}
buf[0] = '(';
buf[d++] = ')';
return d;
}

static void lf_to_crlf(struct msg_data *msg)
{
char *new;
int i, j, lfnum = 0;

if (msg->data[0] == '\n')
lfnum++;
for (i = 1; i < msg->len; i++) {
if (msg->data[i - 1] != '\r' && msg->data[i] == '\n')
lfnum++;
}

new = xmalloc(msg->len + lfnum);
if (msg->data[0] == '\n') {
new[0] = '\r';
new[1] = '\n';
i = 1;
j = 2;
} else {
new[0] = msg->data[0];
i = 1;
j = 1;
}
for ( ; i < msg->len; i++) {
if (msg->data[i] != '\n') {
new[j++] = msg->data[i];
continue;
}
if (msg->data[i - 1] != '\r')
new[j++] = '\r';
/* otherwise it already had CR before */
new[j++] = '\n';
}
msg->len += lfnum;
free(msg->data);
msg->data = new;
}

static int imap_store_msg(struct store *gctx, struct msg_data *data)
{
struct imap_store *ctx = (struct imap_store *)gctx;
struct imap *imap = ctx->imap;
struct imap_cmd_cb cb;
const char *prefix, *box;
int ret, d;
char flagstr[128];

lf_to_crlf(data);
memset(&cb, 0, sizeof(cb));

cb.dlen = data->len;
cb.data = xmalloc(cb.dlen);
memcpy(cb.data, data->data, data->len);

d = 0;
if (data->flags) {
d = imap_make_flags(data->flags, flagstr);
flagstr[d++] = ' ';
}
flagstr[d] = 0;

box = gctx->name;
prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
cb.create = 0;
ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" %s", prefix, box, flagstr);
imap->caps = imap->rcaps;
if (ret != DRV_OK)
return ret;
gctx->count++;

return DRV_OK;
}

static void encode_html_chars(struct strbuf *p)
{
int i;
for (i = 0; i < p->len; i++) {
if (p->buf[i] == '&')
strbuf_splice(p, i, 1, "&amp;", 5);
if (p->buf[i] == '<')
strbuf_splice(p, i, 1, "&lt;", 4);
if (p->buf[i] == '>')
strbuf_splice(p, i, 1, "&gt;", 4);
if (p->buf[i] == '"')
strbuf_splice(p, i, 1, "&quot;", 6);
}
}
static void wrap_in_html(struct msg_data *msg)
{
struct strbuf buf = STRBUF_INIT;
struct strbuf **lines;
struct strbuf **p;
static char *content_type = "Content-Type: text/html;\n";
static char *pre_open = "<pre>\n";
static char *pre_close = "</pre>\n";
int added_header = 0;

strbuf_attach(&buf, msg->data, msg->len, msg->len);
lines = strbuf_split(&buf, '\n');
strbuf_release(&buf);
for (p = lines; *p; p++) {
if (! added_header) {
if ((*p)->len == 1 && *((*p)->buf) == '\n') {
strbuf_addstr(&buf, content_type);
strbuf_addbuf(&buf, *p);
strbuf_addstr(&buf, pre_open);
added_header = 1;
continue;
}
}
else
encode_html_chars(*p);
strbuf_addbuf(&buf, *p);
}
strbuf_addstr(&buf, pre_close);
strbuf_list_free(lines);
msg->len = buf.len;
msg->data = strbuf_detach(&buf, NULL);
}

#define CHUNKSIZE 0x1000

static int read_message(FILE *f, struct msg_data *msg)
{
struct strbuf buf = STRBUF_INIT;

memset(msg, 0, sizeof(*msg));

do {
if (strbuf_fread(&buf, CHUNKSIZE, f) <= 0)
break;
} while (!feof(f));

msg->len = buf.len;
msg->data = strbuf_detach(&buf, NULL);
return msg->len;
}

static int count_messages(struct msg_data *msg)
{
int count = 0;
char *p = msg->data;

while (1) {
if (!prefixcmp(p, "From ")) {
p = strstr(p+5, "\nFrom: ");
if (!p) break;
p = strstr(p+7, "\nDate: ");
if (!p) break;
p = strstr(p+7, "\nSubject: ");
if (!p) break;
p += 10;
count++;
}
p = strstr(p+5, "\nFrom ");
if (!p)
break;
p++;
}
return count;
}

static int split_msg(struct msg_data *all_msgs, struct msg_data *msg, int *ofs)
{
char *p, *data;

memset(msg, 0, sizeof *msg);
if (*ofs >= all_msgs->len)
return 0;

data = &all_msgs->data[*ofs];
msg->len = all_msgs->len - *ofs;

if (msg->len < 5 || prefixcmp(data, "From "))
return 0;

p = strchr(data, '\n');
if (p) {
p = &p[1];
msg->len -= p-data;
*ofs += p-data;
data = p;
}

p = strstr(data, "\nFrom ");
if (p)
msg->len = &p[1] - data;

msg->data = xmemdupz(data, msg->len);
*ofs += msg->len;
return 1;
}

static char *imap_folder;

static int git_imap_config(const char *key, const char *val, void *cb)
{
char imap_key[] = "imap.";

if (strncmp(key, imap_key, sizeof imap_key - 1))
return 0;

key += sizeof imap_key - 1;

/* check booleans first, and barf on others */
if (!strcmp("sslverify", key))
server.ssl_verify = git_config_bool(key, val);
else if (!strcmp("preformattedhtml", key))
server.use_html = git_config_bool(key, val);
else if (!val)
return config_error_nonbool(key);

if (!strcmp("folder", key)) {
imap_folder = xstrdup(val);
} else if (!strcmp("host", key)) {
if (!prefixcmp(val, "imap:"))
val += 5;
else if (!prefixcmp(val, "imaps:")) {
val += 6;
server.use_ssl = 1;
}
if (!prefixcmp(val, "//"))
val += 2;
server.host = xstrdup(val);
} else if (!strcmp("user", key))
server.user = xstrdup(val);
else if (!strcmp("pass", key))
server.pass = xstrdup(val);
else if (!strcmp("port", key))
server.port = git_config_int(key, val);
else if (!strcmp("tunnel", key))
server.tunnel = xstrdup(val);
else if (!strcmp("authmethod", key))
server.auth_method = xstrdup(val);

return 0;
}

int main(int argc, char **argv)
{
struct msg_data all_msgs, msg;
struct store *ctx = NULL;
int ofs = 0;
int r;
int total, n = 0;
int nongit_ok;

git_extract_argv0_path(argv[0]);

git_setup_gettext();

if (argc != 1)
usage(imap_send_usage);

setup_git_directory_gently(&nongit_ok);
git_config(git_imap_config, NULL);

if (!server.port)
server.port = server.use_ssl ? 993 : 143;

if (!imap_folder) {
fprintf(stderr, "no imap store specified\n");
return 1;
}
if (!server.host) {
if (!server.tunnel) {
fprintf(stderr, "no imap host specified\n");
return 1;
}
server.host = "tunnel";
}

/* read the messages */
if (!read_message(stdin, &all_msgs)) {
fprintf(stderr, "nothing to send\n");
return 1;
}

total = count_messages(&all_msgs);
if (!total) {
fprintf(stderr, "no messages to send\n");
return 1;
}

/* write it to the imap server */
ctx = imap_open_store(&server);
if (!ctx) {
fprintf(stderr, "failed to open store\n");
return 1;
}

fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
ctx->name = imap_folder;
while (1) {
unsigned percent = n * 100 / total;
fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
if (!split_msg(&all_msgs, &msg, &ofs))
break;
if (server.use_html)
wrap_in_html(&msg);
r = imap_store_msg(ctx, &msg);
if (r != DRV_OK)
break;
n++;
}
fprintf(stderr, "\n");

imap_close_store(ctx);

return 0;
}
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