text: /*
   * 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 "config.h"
  #include "credential.h"
  #include "exec_cmd.h"
  #include "run-command.h"
  #include "parse-options.h"
  #ifdef NO_OPENSSL
  typedef void *SSL;
  #endif
  #ifdef USE_CURL_FOR_IMAP_SEND
  #include "http.h"
  #endif
  
  #if defined(USE_CURL_FOR_IMAP_SEND) && defined(NO_OPENSSL)
  /* only available option */
  #define USE_CURL_DEFAULT 1
  #else
  /* strictly opt in */
  #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 {
  	char *name;
  	char *tunnel;
  	char *host;
  	int port;
  	char *folder;
  	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,	/* folder */
  	NULL,	/* user */
  	NULL,	/* pass */
  	0,   	/* use_ssl */
  	1,   	/* ssl_verify */
  	0,   	/* use_html */
  	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;
  };
  
  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();
  
  	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 */
  }
  
  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);
  	}
  }
  
  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;
  }
  
  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("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 != '[')
  		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;
  	char *cmd, *arg, *arg1;
  	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_AND_NULL(cmdp->cb.data);
  				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))
  					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;
  			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;
  	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, 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, char *folder)
  {
  	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(1, sizeof(*imap));
  	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);
  
  		argv_array_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");
  		if (!srvc->user || !srvc->pass) {
  			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);
  		}
  
  		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;
  	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 = xmallocz(j);
  
  	/*
  	 * 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;
  	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;
  }
  
  #define CHUNKSIZE 0x1000
  
  static int read_message(FILE *f, struct strbuf *all_msgs)
  {
  	do {
  		if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
  			break;
  	} while (!feof(f));
  
  	return ferror(f) ? -1 : 0;
  }
  
  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 void git_imap_config(void)
  {
  	const char *val = NULL;
  
  	git_config_get_bool("imap.sslverify", &server.ssl_verify);
  	git_config_get_bool("imap.preformattedhtml", &server.use_html);
  	git_config_get_string("imap.folder", &server.folder);
  
  	if (!git_config_get_value("imap.host", &val)) {
  		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);
  		}
  	}
  
  	git_config_get_string("imap.user", &server.user);
  	git_config_get_string("imap.pass", &server.pass);
  	git_config_get_int("imap.port", &server.port);
  	git_config_get_string("imap.tunnel", &server.tunnel);
  	git_config_get_string("imap.authmethod", &server.auth_method);
  }
  
  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)
  {
  	CURL *curl;
  	struct strbuf path = STRBUF_INIT;
  
  	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");
  
  	curl_easy_setopt(curl, CURLOPT_USERNAME, server.user);
  	curl_easy_setopt(curl, CURLOPT_PASSWORD, server.pass);
  
  	strbuf_addstr(&path, server.use_ssl ? "imaps://" : "imap://");
  	strbuf_addstr(&path, server.host);
  	if (!path.len || path.buf[path.len - 1] != '/')
  		strbuf_addch(&path, '/');
  	strbuf_addstr(&path, server.folder);
  
  	curl_easy_setopt(curl, CURLOPT_URL, path.buf);
  	strbuf_release(&path);
  	curl_easy_setopt(curl, CURLOPT_PORT, server.port);
  
  	if (server.auth_method) {
  #if LIBCURL_VERSION_NUM < 0x072200
  		warning("No LOGIN_OPTIONS support in this cURL version");
  #else
  		struct strbuf auth = STRBUF_INIT;
  		strbuf_addstr(&auth, "AUTH=");
  		strbuf_addstr(&auth, server.auth_method);
  		curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
  		strbuf_release(&auth);
  #endif
  	}
  
  	if (!server.use_ssl)
  		curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
  
  	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_UPLOAD, 1L);
  
  	if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
  		curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
  	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;
  
  	curl = setup_curl(server);
  	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();
  
  	return 0;
  }
  #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_imap_config();
  
  	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 (read_message(stdin, &all_msgs)) {
  		fprintf(stderr, "error reading input\n");
  		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);
  }
  