[PATCH/RFC] git-imap-send: use libcurl for implementation

[Bernhard Reiter <ockham@raz.or.at>]

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Use libcurl's high-level API functions to implement git-imap-send
instead of the previous low-level OpenSSL-based functions.

Signed-off-by: Bernhard Reiter <ockham@raz.or.at>
---
Since version 7.30.0, libcurl's API has been able to communicate with
IMAP servers. Using those high-level functions instead of the current
ones reduces imap-send.c by some 1200 lines of code.

As I don't have access to that many IMAP servers, I haven't been able to
test a variety of parameter combinations. I did test both secure and
insecure (imaps:// and imap://) connections -- this e-mail was generated
that way -- but could e.g. neither test the authMethod nor the tunnel
parameter.

As git-imap-send is one of the two instances OpenSSL is currently used
by git -- the other one being SHA1 -- it might be worthwhile considering
dropping it altogether as there's already a SHA1 library built into git
available as an alternative.

Kind regards
Bernhard
PS: Please CC!

 INSTALL     |   14 +-
 Makefile    |    4 +-
 git.spec.in |    5 +-
 imap-send.c | 1288
+++++------------------------------------------------------
 4 files changed, 111 insertions(+), 1200 deletions(-)



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diff --git a/INSTALL b/INSTALL
index 6ec7a24..2cd3a42 100644
--- a/INSTALL
+++ b/INSTALL
@@ -108,18 +108,16 @@ Issues of note:
 	  so you might need to install additional packages other than Perl
 	  itself, e.g. Time::HiRes.
 
-	- "openssl" library is used by git-imap-send to use IMAP over SSL.
-	  If you don't need it, use NO_OPENSSL.
-
-	  By default, git uses OpenSSL for SHA1 but it will use its own
+	- By default, git uses OpenSSL for SHA1 but it will use its own
 	  library (inspired by Mozilla's) with either NO_OPENSSL or
 	  BLK_SHA1.  Also included is a version optimized for PowerPC
 	  (PPC_SHA1).
 
-	- "libcurl" library is used by git-http-fetch and git-fetch.  You
-	  might also want the "curl" executable for debugging purposes.
-	  If you do not use http:// or https:// repositories, you do not
-	  have to have them (use NO_CURL).
+	- "libcurl" library is used by git-http-fetch, git-fetch, and
+	  git-impap-send.  You might also want the "curl" executable for
+	  debugging purposes. If you do not use http:// or https://
+	  repositories, and do not want to put patches into an IMAP
+	  mailbox, you do not have to have them (use NO_CURL).
 
 	- "expat" library; git-http-push uses it for remote lock
 	  management over DAV.  Similar to "curl" above, this is optional
diff --git a/Makefile b/Makefile
index 2320de5..7805603 100644
--- a/Makefile
+++ b/Makefile
@@ -2067,9 +2067,9 @@ endif
 git-%$X: %.o GIT-LDFLAGS $(GITLIBS)
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
 
-git-imap-send$X: imap-send.o GIT-LDFLAGS $(GITLIBS)
+git-imap-send$X: imap-send.o http.o GIT-LDFLAGS $(GITLIBS)
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
-		$(LIBS) $(OPENSSL_LINK) $(OPENSSL_LIBSSL) $(LIB_4_CRYPTO)
+		$(LIBS) $(CURL_LIBCURL)
 
 git-http-fetch$X: http.o http-walker.o http-fetch.o GIT-LDFLAGS $(GITLIBS)
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
diff --git a/git.spec.in b/git.spec.in
index d61d537..7d9230f 100644
--- a/git.spec.in
+++ b/git.spec.in
@@ -8,7 +8,7 @@ License: 	GPL
 Group: 		Development/Tools
 URL: 		http://kernel.org/pub/software/scm/git/
 Source: 	http://kernel.org/pub/software/scm/git/%{name}-%{version}.tar.gz
-BuildRequires:	zlib-devel >= 1.2, openssl-devel, curl-devel, expat-devel, gettext  %{!?_without_docs:, xmlto, asciidoc > 6.0.3}
+BuildRequires:	zlib-devel >= 1.2, openssl-devel, curl-devel >= 7.30.0, expat-devel, gettext  %{!?_without_docs:, xmlto, asciidoc > 6.0.3}
 BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 Requires:	perl-Git = %{version}-%{release}
@@ -214,6 +214,9 @@ rm -rf $RPM_BUILD_ROOT
 # No files for you!
 
 %changelog
+* Mon Aug 11 2014 Bernhard Reiter <ockham@raz.or.at>
+- Require version >= 7.30.0 of curl-devel for IMAP functions.
+
 * Sun Sep 18 2011 Jakub Narebski <jnareb@gmail.com>
 - Add gitweb manpages to 'gitweb' subpackage
 
diff --git a/imap-send.c b/imap-send.c
index 524fbab..0c4583f 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -22,47 +22,13 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#include "cache.h"
-#include "credential.h"
+#include "http.h"
 #include "exec_cmd.h"
 #include "run-command.h"
-#ifdef NO_OPENSSL
-typedef void *SSL;
-#endif
 
-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 **);
-
-__attribute__((format (printf, 3, 4)))
-static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
+#include <curl/curl.h>
 
-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;
-}
+static const char imap_send_usage[] = "git imap-send < <mbox>";
 
 struct imap_server_conf {
 	char *name;
@@ -90,1144 +56,6 @@ static struct imap_server_conf server = {
 	NULL,	/* auth_method */
 };
 
-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, 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);
-
-
-#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);
-	}
-}
-
-#ifdef NO_OPENSSL
-static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
-{
-	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();
-
-	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;
-	}
-
-#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 (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 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 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 != '[')
-		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->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, *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)) {
-				/* 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(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(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*((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 imap_store *imap_open_store(struct imap_server_conf *srvc)
-{
-	struct credential cred = CREDENTIAL_INIT;
-	struct imap_store *ctx;
-	struct imap *imap;
-	char *arg, *rsp;
-	int s = -1, preauth;
-
-	ctx = xcalloc(1, sizeof(*ctx));
-
-	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 || !srvc->pass) {
-			cred.protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
-			cred.host = xstrdup(srvc->host);
-
-			if (srvc->user)
-				cred.username = xstrdup(srvc->user);
-			if (srvc->pass)
-				cred.password = xstrdup(srvc->pass);
-
-			credential_fill(&cred);
-
-			if (!srvc->user)
-				srvc->user = xstrdup(cred.username);
-			if (!srvc->pass)
-				srvc->pass = xstrdup(cred.password);
-		}
-
-		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 */
-
-	if (cred.username)
-		credential_approve(&cred);
-	credential_clear(&cred);
-
-	ctx->prefix = "";
-	return ctx;
-
-bail:
-	if (cred.username)
-		credential_reject(&cred);
-	credential_clear(&cred);
-
-	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;
-	size_t i, j;
-	char lastc;
-
-	/* First pass: tally, in j, the size of the new 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 = xmalloc(j + 1);
-
-	/*
-	 * Second pass: write the new 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[j++] = '\r';
-		lastc = new[j++] = msg->buf[i];
-	}
-	strbuf_attach(msg, new, 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;
-	cb.create = 0;
-	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;
@@ -1324,6 +152,28 @@ static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
 	return 1;
 }
 
+static curl_socket_t opensocket(void *clientp, curlsocktype purpose,
+								struct curl_sockaddr *address)
+{
+	curl_socket_t sockfd;
+	(void)purpose;
+	(void)address;
+	sockfd = *(curl_socket_t *)clientp;
+	/* the actual externally set socket is passed in via the OPENSOCKETDATA
+	   option */
+	return sockfd;
+}
+
+static int sockopt_callback(void *clientp, curl_socket_t curlfd,
+							curlsocktype purpose)
+{
+	(void)clientp;
+	(void)curlfd;
+	(void)purpose;
+	/* This return code was added in libcurl 7.21.5 */
+	return CURL_SOCKOPT_ALREADY_CONNECTED;
+}
+
 static char *imap_folder;
 
 static int git_imap_config(const char *key, const char *val, void *cb)
@@ -1368,12 +218,14 @@ static int git_imap_config(const char *key, const char *val, void *cb)
 int main(int argc, char **argv)
 {
 	struct strbuf all_msgs = STRBUF_INIT;
-	struct strbuf msg = STRBUF_INIT;
-	struct imap_store *ctx = NULL;
+	struct buffer msg = { STRBUF_INIT, 0 };
 	int ofs = 0;
-	int r;
 	int total, n = 0;
 	int nongit_ok;
+	char path[8192];
+	int pathlen;
+	CURL *curl;
+	CURLcode r = CURLE_OK;
 
 	git_extract_argv0_path(argv[0]);
 
@@ -1417,31 +269,89 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
-	/* write it to the imap server */
-	ctx = imap_open_store(&server);
-	if (!ctx) {
-		fprintf(stderr, "failed to open store\n");
+	curl_global_init(CURL_GLOBAL_ALL);
+	curl = curl_easy_init();
+
+	if (!curl) {
+		fprintf(stderr, "failed to init curl\n");
 		return 1;
 	}
 
+	curl_easy_setopt(curl, CURLOPT_USERNAME, server.user);
+	curl_easy_setopt(curl, CURLOPT_PASSWORD, server.pass);
+
+	if (ends_with(server.host, "/"))
+		pathlen = snprintf (path, sizeof(path), "%s%s", server.host, imap_folder);
+	else
+		pathlen = snprintf (path, sizeof(path), "%s/%s", server.host, imap_folder);
+
+	if (pathlen < 0)
+		die("Fatal: Out of memory");
+	if (pathlen >= sizeof(path))
+		die("imap URL overflow!");
+
+	curl_easy_setopt(curl, CURLOPT_URL, path);
+	curl_easy_setopt(curl, CURLOPT_PORT, server.port);
+	curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, server.auth_method);
+
+	if (server.tunnel) {
+		const char *argv[] = { server.tunnel, NULL };
+		struct child_process tunnel = {NULL};
+
+		fprintf(stderr, "Starting tunnel '%s'... ", server.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]);
+
+		curl_socket_t sockfd = tunnel.out; // what about tunnel.in ?
+
+		/* call this function to get a socket */
+		curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket);
+		curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sockfd);
+
+		/* call this function to set options for the socket */
+		curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
+	}
+
+	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, server.ssl_verify);
+	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, server.ssl_verify);
+
+	curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
+	curl_easy_setopt(curl, CURLOPT_READDATA, &msg);
+	curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+
+	/* curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); */
+
 	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))
+		int prev_len = msg.buf.len;
+		if (!split_msg(&all_msgs, &msg.buf, &ofs))
 			break;
 		if (server.use_html)
-			wrap_in_html(&msg);
-		r = imap_store_msg(ctx, &msg);
-		if (r != DRV_OK)
+			wrap_in_html(&msg.buf);
+
+		curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)(msg.buf.len-prev_len));
+
+		r = curl_easy_perform(curl);
+
+		if(r != CURLE_OK) {
+			fprintf(stderr, "curl_easy_perform() failed: %s\n",
+					curl_easy_strerror(r));
 			break;
+		}
 		n++;
 	}
 	fprintf(stderr, "\n");
 
-	imap_close_store(ctx);
-
+	curl_easy_cleanup(curl);
+	curl_global_cleanup();
 	return 0;
 }