Adding upstream version 1:2.43.0.upstream/1%2.43.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1595 insertions, 0 deletions

diff --git a/imap-send.c b/imap-send.c
new file mode 100644
index 0000000..996651e
--- /dev/null
+++ b/imap-send.c
@@ -0,0 +1,1595 @@
+/*
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "git-compat-util.h"
+#include "config.h"
+#include "credential.h"
+#include "exec-cmd.h"
+#include "gettext.h"
+#include "run-command.h"
+#include "parse-options.h"
+#include "setup.h"
+#include "strbuf.h"
+#if defined(NO_OPENSSL) && !defined(HAVE_OPENSSL_CSPRNG)
+typedef void *SSL;
+#endif
+#ifdef USE_CURL_FOR_IMAP_SEND
+#include "http.h"
+#endif
+
+#if defined(USE_CURL_FOR_IMAP_SEND)
+/* Always default to curl if it's available. */
+#define USE_CURL_DEFAULT 1
+#else
+/* We don't have curl, so continue to use the historical implementation */
+#define USE_CURL_DEFAULT 0
+#endif
+
+static int verbosity;
+static int use_curl = USE_CURL_DEFAULT;
+
+static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] [--[no-]curl] < <mbox>", NULL };
+
+static struct option imap_send_options[] = {
+	OPT__VERBOSITY(&verbosity),
+	OPT_BOOL(0, "curl", &use_curl, "use libcurl to communicate with the IMAP server"),
+	OPT_END()
+};
+
+#undef DRV_OK
+#define DRV_OK          0
+#define DRV_MSG_BAD     -1
+#define DRV_BOX_BAD     -2
+#define DRV_STORE_BAD   -3
+
+__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 **);
+
+__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 {
+	const char *name;
+	const char *tunnel;
+	const char *host;
+	int port;
+	const char *folder;
+	const char *user;
+	const char *pass;
+	int use_ssl;
+	int ssl_verify;
+	int use_html;
+	const char *auth_method;
+};
+
+static struct imap_server_conf server = {
+	.ssl_verify = 1,
+};
+
+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 */
+	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 {
+	/* currently open mailbox */
+	const char *name; /* foreign! maybe preset? */
+	int uidvalidity;
+	struct imap *imap;
+	const char *prefix;
+};
+
+struct imap_cmd_cb {
+	int (*cont)(struct imap_store *ctx, const char *prompt);
+	void *ctx;
+	char *data;
+	int dlen;
+};
+
+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);
+
+
+#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);
+	}
+	/* mark as used to appease -Wunused-parameter with NO_OPENSSL */
+	(void)sock;
+}
+
+#ifdef NO_OPENSSL
+static int ssl_socket_connect(struct imap_socket *sock UNUSED,
+			      int use_tls_only UNUSED,
+			      int verify UNUSED)
+{
+	fprintf(stderr, "SSL requested but SSL support not compiled in\n");
+	return -1;
+}
+
+#else
+
+static int host_matches(const char *host, const char *pattern)
+{
+	if (pattern[0] == '*' && pattern[1] == '.') {
+		pattern += 2;
+		if (!(host = strchr(host, '.')))
+			return 0;
+		host++;
+	}
+
+	return *host && *pattern && !strcasecmp(host, pattern);
+}
+
+static int verify_hostname(X509 *cert, const char *hostname)
+{
+	int len;
+	X509_NAME *subj;
+	char cname[1000];
+	int i, found;
+	STACK_OF(GENERAL_NAME) *subj_alt_names;
+
+	/* try the DNS subjectAltNames */
+	found = 0;
+	if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
+		int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
+		for (i = 0; !found && i < num_subj_alt_names; i++) {
+			GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
+			if (subj_alt_name->type == GEN_DNS &&
+			    strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
+			    host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
+				found = 1;
+		}
+		sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
+	}
+	if (found)
+		return 0;
+
+	/* try the common name */
+	if (!(subj = X509_get_subject_name(cert)))
+		return error("cannot get certificate subject");
+	if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
+		return error("cannot get certificate common name");
+	if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
+		return 0;
+	return error("certificate owner '%s' does not match hostname '%s'",
+		     cname, hostname);
+}
+
+static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
+{
+#if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
+	const SSL_METHOD *meth;
+#else
+	SSL_METHOD *meth;
+#endif
+	SSL_CTX *ctx;
+	int ret;
+	X509 *cert;
+
+	SSL_library_init();
+	SSL_load_error_strings();
+
+	meth = SSLv23_method();
+	if (!meth) {
+		ssl_socket_perror("SSLv23_method");
+		return -1;
+	}
+
+	ctx = SSL_CTX_new(meth);
+	if (!ctx) {
+		ssl_socket_perror("SSL_CTX_new");
+		return -1;
+	}
+
+	if (use_tls_only)
+		SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
+
+	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;
+	}
+
+#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
+	/*
+	 * SNI (RFC4366)
+	 * OpenSSL does not document this function, but the implementation
+	 * returns 1 on success, 0 on failure after calling SSLerr().
+	 */
+	ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
+	if (ret != 1)
+		warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
+#endif
+
+	ret = SSL_connect(sock->ssl);
+	if (ret <= 0) {
+		socket_perror("SSL_connect", sock, ret);
+		return -1;
+	}
+
+	if (verify) {
+		/* make sure the hostname matches that of the certificate */
+		cert = SSL_get_peer_certificate(sock->ssl);
+		if (!cert)
+			return error("unable to get peer certificate.");
+		if (verify_hostname(cert, server.host) < 0)
+			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 (0 < verbosity)
+					puts(*s);
+				return 0;
+			}
+		}
+
+		b->offset++;
+	}
+	/* not reached */
+}
+
+__attribute__((format (printf, 1, 2)))
+static void imap_info(const char *msg, ...)
+{
+	va_list va;
+
+	if (0 <= verbosity) {
+		va_start(va, msg);
+		vprintf(msg, va);
+		va_end(va);
+		fflush(stdout);
+	}
+}
+
+__attribute__((format (printf, 1, 2)))
+static void imap_warn(const char *msg, ...)
+{
+	va_list va;
+
+	if (-2 < verbosity) {
+		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;
+}
+
+__attribute__((format (printf, 3, 4)))
+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)
+		BUG("buffer too small. Please report a bug.");
+	va_end(va);
+	return ret;
+}
+
+static struct imap_cmd *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 (0 < verbosity) {
+		if (imap->num_in_progress)
+			printf("(%d in progress) ", imap->num_in_progress);
+		if (!starts_with(cmd->cmd, "LOGIN"))
+			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 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 = 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 = 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 skip_imap_list_l(char **sp, int level)
+{
+	char *s = *sp;
+
+	for (;;) {
+		while (isspace((unsigned char)*s))
+			s++;
+		if (level && *s == ')') {
+			s++;
+			break;
+		}
+		if (*s == '(') {
+			/* sublist */
+			s++;
+			if (skip_imap_list_l(&s, level + 1))
+				goto bail;
+		} else if (*s == '"') {
+			/* quoted string */
+			s++;
+			for (; *s != '"'; s++)
+				if (!*s)
+					goto bail;
+			s++;
+		} else {
+			/* atom */
+			for (; *s && !isspace((unsigned char)*s); s++)
+				if (level && *s == ')')
+					break;
+		}
+
+		if (!level)
+			break;
+		if (!*s)
+			goto bail;
+	}
+	*sp = s;
+	return 0;
+
+bail:
+	return -1;
+}
+
+static void skip_list(char **sp)
+{
+	skip_imap_list_l(sp, 0);
+}
+
+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 || *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 (!arg) {
+		fprintf(stderr, "IMAP error: empty response code\n");
+		return RESP_BAD;
+	}
+	if (!strcmp("UIDVALIDITY", arg)) {
+		if (!(arg = next_arg(&s)) || !(ctx->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->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;
+	char *cmd;
+	const char *arg, *arg1;
+	int n, resp, resp2, tag;
+
+	for (;;) {
+		if (buffer_gets(&imap->buf, &cmd))
+			return RESP_BAD;
+
+		arg = next_arg(&cmd);
+		if (!arg) {
+			fprintf(stderr, "IMAP error: empty response\n");
+			return RESP_BAD;
+		}
+		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)) {
+				/* rfc2342 NAMESPACE response. */
+				skip_list(&cmd); /* Personal mailboxes */
+				skip_list(&cmd); /* Others' mailboxes */
+				skip_list(&cmd); /* Shared mailboxes */
+			} 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))) {
+				; /*
+				   * Unhandled response-data with at least two words.
+				   * Ignore it.
+				   *
+				   * NEEDSWORK: Previously this case handled '<num> EXISTS'
+				   * and '<num> RECENT' but as a probably-unintended side
+				   * effect it ignores other unrecognized two-word
+				   * responses.  imap-send doesn't ever try to read
+				   * messages or mailboxes these days, so consider
+				   * eliminating this case.
+				   */
+			} 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_AND_NULL(cmdp->cb.data);
+				if (n != (int)cmdp->cb.dlen)
+					return RESP_BAD;
+			} else if (cmdp->cb.cont) {
+				if (cmdp->cb.cont(ctx, 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 (!arg)
+				arg = "";
+			if (!strcmp("OK", arg))
+				resp = DRV_OK;
+			else {
+				if (!strcmp("NO", arg))
+					resp = RESP_NO;
+				else /*if (!strcmp("BAD", arg))*/
+					resp = RESP_BAD;
+				fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
+					!starts_with(cmdp->cmd, "LOGIN") ?
+							cmdp->cmd : "LOGIN <user> <pass>",
+							arg, cmd ? cmd : "");
+			}
+			if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
+				resp = resp2;
+			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(imap);
+}
+
+static void imap_close_store(struct imap_store *ctx)
+{
+	imap_close_server(ctx);
+	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 * DIV_ROUND_UP((n), 3))
+static char *cram(const char *challenge_64, const char *user, const char *pass)
+{
+	int i, resp_len, encoded_len, decoded_len;
+	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);
+	if (!HMAC(EVP_md5(), pass, strlen(pass), (unsigned char *)challenge, decoded_len, hash, NULL))
+		die("HMAC error");
+
+	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>" */
+	response = xstrfmt("%s %s", user, hex);
+	resp_len = strlen(response);
+
+	response_64 = xmallocz(ENCODED_SIZE(resp_len));
+	encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
+				      (unsigned char *)response, resp_len);
+	if (encoded_len < 0)
+		die("EVP_EncodeBlock error");
+	return (char *)response_64;
+}
+
+#else
+
+static char *cram(const char *challenge_64 UNUSED,
+		  const char *user UNUSED,
+		  const char *pass UNUSED)
+{
+	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, 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 void server_fill_credential(struct imap_server_conf *srvc, struct credential *cred)
+{
+	if (srvc->user && srvc->pass)
+		return;
+
+	cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
+	cred->host = xstrdup(srvc->host);
+
+	cred->username = xstrdup_or_null(srvc->user);
+	cred->password = xstrdup_or_null(srvc->pass);
+
+	credential_fill(cred);
+
+	if (!srvc->user)
+		srvc->user = xstrdup(cred->username);
+	if (!srvc->pass)
+		srvc->pass = xstrdup(cred->password);
+}
+
+static struct imap_store *imap_open_store(struct imap_server_conf *srvc, const char *folder)
+{
+	struct credential cred = CREDENTIAL_INIT;
+	struct imap_store *ctx;
+	struct imap *imap;
+	char *arg, *rsp;
+	int s = -1, preauth;
+
+	CALLOC_ARRAY(ctx, 1);
+
+	ctx->imap = CALLOC_ARRAY(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) {
+		struct child_process tunnel = CHILD_PROCESS_INIT;
+
+		imap_info("Starting tunnel '%s'... ", srvc->tunnel);
+
+		strvec_push(&tunnel.args, srvc->tunnel);
+		tunnel.use_shell = 1;
+		tunnel.in = -1;
+		tunnel.out = -1;
+		if (start_command(&tunnel))
+			die("cannot start proxy %s", srvc->tunnel);
+
+		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];
+
+		xsnprintf(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");
+		server_fill_credential(srvc, &cred);
+
+		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 (CAP(NOLOGIN)) {
+				fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n",
+					srvc->user, srvc->host);
+				goto bail;
+			}
+			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 */
+
+	if (cred.username)
+		credential_approve(&cred);
+	credential_clear(&cred);
+
+	/* check the target mailbox exists */
+	ctx->name = folder;
+	switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
+	case RESP_OK:
+		/* ok */
+		break;
+	case RESP_BAD:
+		fprintf(stderr, "IMAP error: could not check mailbox\n");
+		goto out;
+	case RESP_NO:
+		if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
+			imap_info("Created missing mailbox\n");
+		} else {
+			fprintf(stderr, "IMAP error: could not create missing mailbox\n");
+			goto out;
+		}
+		break;
+	}
+
+	ctx->prefix = "";
+	return ctx;
+
+bail:
+	if (cred.username)
+		credential_reject(&cred);
+	credential_clear(&cred);
+
+ out:
+	imap_close_store(ctx);
+	return NULL;
+}
+
+/*
+ * Insert CR characters as necessary in *msg to ensure that every LF
+ * character in *msg is preceded by a CR.
+ */
+static void lf_to_crlf(struct strbuf *msg)
+{
+	char *new_msg;
+	size_t i, j;
+	char lastc;
+
+	/* First pass: tally, in j, the size of the new_msg string: */
+	for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
+		if (msg->buf[i] == '\n' && lastc != '\r')
+			j++; /* a CR will need to be added here */
+		lastc = msg->buf[i];
+		j++;
+	}
+
+	new_msg = xmallocz(j);
+
+	/*
+	 * Second pass: write the new_msg string.  Note that this loop is
+	 * otherwise identical to the first pass.
+	 */
+	for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
+		if (msg->buf[i] == '\n' && lastc != '\r')
+			new_msg[j++] = '\r';
+		lastc = new_msg[j++] = msg->buf[i];
+	}
+	strbuf_attach(msg, new_msg, j, j + 1);
+}
+
+/*
+ * Store msg to IMAP.  Also detach and free the data from msg->data,
+ * leaving msg->data empty.
+ */
+static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
+{
+	struct imap *imap = ctx->imap;
+	struct imap_cmd_cb cb;
+	const char *prefix, *box;
+	int ret;
+
+	lf_to_crlf(msg);
+	memset(&cb, 0, sizeof(cb));
+
+	cb.dlen = msg->len;
+	cb.data = strbuf_detach(msg, NULL);
+
+	box = ctx->name;
+	prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
+	ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
+	imap->caps = imap->rcaps;
+	if (ret != DRV_OK)
+		return ret;
+
+	return DRV_OK;
+}
+
+static void wrap_in_html(struct strbuf *msg)
+{
+	struct strbuf buf = STRBUF_INIT;
+	static char *content_type = "Content-Type: text/html;\n";
+	static char *pre_open = "<pre>\n";
+	static char *pre_close = "</pre>\n";
+	const char *body = strstr(msg->buf, "\n\n");
+
+	if (!body)
+		return; /* Headers but no body; no wrapping needed */
+
+	body += 2;
+
+	strbuf_add(&buf, msg->buf, body - msg->buf - 1);
+	strbuf_addstr(&buf, content_type);
+	strbuf_addch(&buf, '\n');
+	strbuf_addstr(&buf, pre_open);
+	strbuf_addstr_xml_quoted(&buf, body);
+	strbuf_addstr(&buf, pre_close);
+
+	strbuf_release(msg);
+	*msg = buf;
+}
+
+static int count_messages(struct strbuf *all_msgs)
+{
+	int count = 0;
+	char *p = all_msgs->buf;
+
+	while (1) {
+		if (starts_with(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;
+}
+
+/*
+ * Copy the next message from all_msgs, starting at offset *ofs, to
+ * msg.  Update *ofs to the start of the following message.  Return
+ * true iff a message was successfully copied.
+ */
+static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
+{
+	char *p, *data;
+	size_t len;
+
+	if (*ofs >= all_msgs->len)
+		return 0;
+
+	data = &all_msgs->buf[*ofs];
+	len = all_msgs->len - *ofs;
+
+	if (len < 5 || !starts_with(data, "From "))
+		return 0;
+
+	p = strchr(data, '\n');
+	if (p) {
+		p++;
+		len -= p - data;
+		*ofs += p - data;
+		data = p;
+	}
+
+	p = strstr(data, "\nFrom ");
+	if (p)
+		len = &p[1] - data;
+
+	strbuf_add(msg, data, len);
+	*ofs += len;
+	return 1;
+}
+
+static int git_imap_config(const char *var, const char *val,
+			   const struct config_context *ctx, void *cb)
+{
+
+	if (!strcmp("imap.sslverify", var))
+		server.ssl_verify = git_config_bool(var, val);
+	else if (!strcmp("imap.preformattedhtml", var))
+		server.use_html = git_config_bool(var, val);
+	else if (!strcmp("imap.folder", var))
+		return git_config_string(&server.folder, var, val);
+	else if (!strcmp("imap.user", var))
+		return git_config_string(&server.user, var, val);
+	else if (!strcmp("imap.pass", var))
+		return git_config_string(&server.pass, var, val);
+	else if (!strcmp("imap.tunnel", var))
+		return git_config_string(&server.tunnel, var, val);
+	else if (!strcmp("imap.authmethod", var))
+		return git_config_string(&server.auth_method, var, val);
+	else if (!strcmp("imap.port", var))
+		server.port = git_config_int(var, val, ctx->kvi);
+	else if (!strcmp("imap.host", var)) {
+		if (!val) {
+			git_die_config("imap.host", "Missing value for 'imap.host'");
+		} else {
+			if (starts_with(val, "imap:"))
+				val += 5;
+			else if (starts_with(val, "imaps:")) {
+				val += 6;
+				server.use_ssl = 1;
+			}
+			if (starts_with(val, "//"))
+				val += 2;
+			server.host = xstrdup(val);
+		}
+	} else
+		return git_default_config(var, val, ctx, cb);
+
+	return 0;
+}
+
+static int append_msgs_to_imap(struct imap_server_conf *server,
+			       struct strbuf* all_msgs, int total)
+{
+	struct strbuf msg = STRBUF_INIT;
+	struct imap_store *ctx = NULL;
+	int ofs = 0;
+	int r;
+	int n = 0;
+
+	ctx = imap_open_store(server, server->folder);
+	if (!ctx) {
+		fprintf(stderr, "failed to open store\n");
+		return 1;
+	}
+	ctx->name = server->folder;
+
+	fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
+	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;
+}
+
+#ifdef USE_CURL_FOR_IMAP_SEND
+static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
+{
+	CURL *curl;
+	struct strbuf path = STRBUF_INIT;
+	char *uri_encoded_folder;
+
+	if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
+		die("curl_global_init failed");
+
+	curl = curl_easy_init();
+
+	if (!curl)
+		die("curl_easy_init failed");
+
+	server_fill_credential(srvc, cred);
+	curl_easy_setopt(curl, CURLOPT_USERNAME, srvc->user);
+	curl_easy_setopt(curl, CURLOPT_PASSWORD, srvc->pass);
+
+	strbuf_addstr(&path, srvc->use_ssl ? "imaps://" : "imap://");
+	strbuf_addstr(&path, srvc->host);
+	if (!path.len || path.buf[path.len - 1] != '/')
+		strbuf_addch(&path, '/');
+
+	uri_encoded_folder = curl_easy_escape(curl, srvc->folder, 0);
+	if (!uri_encoded_folder)
+		die("failed to encode server folder");
+	strbuf_addstr(&path, uri_encoded_folder);
+	curl_free(uri_encoded_folder);
+
+	curl_easy_setopt(curl, CURLOPT_URL, path.buf);
+	strbuf_release(&path);
+	curl_easy_setopt(curl, CURLOPT_PORT, srvc->port);
+
+	if (srvc->auth_method) {
+#ifndef GIT_CURL_HAVE_CURLOPT_LOGIN_OPTIONS
+		warning("No LOGIN_OPTIONS support in this cURL version");
+#else
+		struct strbuf auth = STRBUF_INIT;
+		strbuf_addstr(&auth, "AUTH=");
+		strbuf_addstr(&auth, srvc->auth_method);
+		curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
+		strbuf_release(&auth);
+#endif
+	}
+
+	if (!srvc->use_ssl)
+		curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
+
+	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, srvc->ssl_verify);
+	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, srvc->ssl_verify);
+
+	curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
+
+	curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+
+	if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
+		http_trace_curl_no_data();
+	setup_curl_trace(curl);
+
+	return curl;
+}
+
+static int curl_append_msgs_to_imap(struct imap_server_conf *server,
+				    struct strbuf* all_msgs, int total)
+{
+	int ofs = 0;
+	int n = 0;
+	struct buffer msgbuf = { STRBUF_INIT, 0 };
+	CURL *curl;
+	CURLcode res = CURLE_OK;
+	struct credential cred = CREDENTIAL_INIT;
+
+	curl = setup_curl(server, &cred);
+	curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
+
+	fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
+	while (1) {
+		unsigned percent = n * 100 / total;
+		int prev_len;
+
+		fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
+
+		prev_len = msgbuf.buf.len;
+		if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
+			break;
+		if (server->use_html)
+			wrap_in_html(&msgbuf.buf);
+		lf_to_crlf(&msgbuf.buf);
+
+		curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
+				 (curl_off_t)(msgbuf.buf.len-prev_len));
+
+		res = curl_easy_perform(curl);
+
+		if(res != CURLE_OK) {
+			fprintf(stderr, "curl_easy_perform() failed: %s\n",
+					curl_easy_strerror(res));
+			break;
+		}
+
+		n++;
+	}
+	fprintf(stderr, "\n");
+
+	curl_easy_cleanup(curl);
+	curl_global_cleanup();
+
+	if (cred.username) {
+		if (res == CURLE_OK)
+			credential_approve(&cred);
+		else if (res == CURLE_LOGIN_DENIED)
+			credential_reject(&cred);
+	}
+
+	credential_clear(&cred);
+
+	return res != CURLE_OK;
+}
+#endif
+
+int cmd_main(int argc, const char **argv)
+{
+	struct strbuf all_msgs = STRBUF_INIT;
+	int total;
+	int nongit_ok;
+
+	setup_git_directory_gently(&nongit_ok);
+	git_config(git_imap_config, NULL);
+
+	argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
+
+	if (argc)
+		usage_with_options(imap_send_usage, imap_send_options);
+
+#ifndef USE_CURL_FOR_IMAP_SEND
+	if (use_curl) {
+		warning("--curl not supported in this build");
+		use_curl = 0;
+	}
+#elif defined(NO_OPENSSL)
+	if (!use_curl) {
+		warning("--no-curl not supported in this build");
+		use_curl = 1;
+	}
+#endif
+
+	if (!server.port)
+		server.port = server.use_ssl ? 993 : 143;
+
+	if (!server.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 (strbuf_read(&all_msgs, 0, 0) < 0) {
+		error_errno(_("could not read from stdin"));
+		return 1;
+	}
+
+	if (all_msgs.len == 0) {
+		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 */
+
+	if (server.tunnel)
+		return append_msgs_to_imap(&server, &all_msgs, total);
+
+#ifdef USE_CURL_FOR_IMAP_SEND
+	if (use_curl)
+		return curl_append_msgs_to_imap(&server, &all_msgs, total);
+#endif
+
+	return append_msgs_to_imap(&server, &all_msgs, total);
+}