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common: Add stream interface to call-pgp.

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* common/call-gpg.c (struct writer_thread_parms): Add field 'stream'.
(writer_thread_main): Support reading from a stream.
(start_writer): Add stream argument.
(struct reader_thread_parms): Add field 'stream'.
(reader_thread_main): Support writing to a stream.
(start_reader): Add stream argument.
(_gpg_encrypt): Add stream api.
(gpg_encrypt_blob): Adapt accordingly.
(gpg_encrypt_stream): New function.
(_gpg_decrypt): Add stream api.
(gpg_decrypt_blob): Adapt accordingly.
(gpg_decrypt_stream): New function.
* common/call-gpg.h (gpg_encrypt_stream): New prototype.
(gpg_decrypt_stream): Likewise.

Signed-off-by: Justus Winter <justus@g10code.com>
This commit is contained in:
Justus Winter 2015-11-24 18:31:14 +01:00
parent cb18d80230
commit 03bf88f32c
2 changed files with 128 additions and 19 deletions
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135
common/call-gpg.c
View File

@ -151,6 +151,7 @@ struct writer_thread_parms
int fd;
const void *data;
size_t datalen;
estream_t stream;
gpg_error_t *err_addr;
};
@ -159,9 +160,27 @@ struct writer_thread_parms
static void *
writer_thread_main (void *arg)
{
gpg_error_t err = 0;
struct writer_thread_parms *parm = arg;
const char *buffer = parm->data;
size_t length = parm->datalen;
char _buffer[4096];
char *buffer;
size_t length;
if (parm->stream)
{
buffer = _buffer;
err = es_read (parm->stream, buffer, sizeof _buffer, &length);
if (err)
{
log_error ("reading stream failed: %s\n", gpg_strerror (err));
goto leave;
}
}
else
{
buffer = (char *) parm->data;
length = parm->datalen;
}
while (length)
{
@ -172,13 +191,33 @@ writer_thread_main (void *arg)
{
if (errno == EINTR)
continue;
*parm->err_addr = gpg_error_from_syserror ();
err = gpg_error_from_syserror ();
break; /* Write error. */
}
length -= nwritten;
buffer += nwritten;
if (parm->stream)
{
if (length == 0)
{
err = es_read (parm->stream, buffer, sizeof _buffer, &length);
if (err)
{
log_error ("reading stream failed: %s\n",
gpg_strerror (err));
break;
}
if (length == 0)
/* We're done. */
break;
}
}
else
buffer += nwritten;
}
leave:
*parm->err_addr = err;
if (close (parm->fd))
log_error ("closing writer fd %d failed: %s\n", parm->fd, strerror (errno));
xfree (parm);
@ -192,7 +231,7 @@ writer_thread_main (void *arg)
variable to receive a possible write error after the thread has
finished. */
static gpg_error_t
start_writer (int fd, const void *data, size_t datalen,
start_writer (int fd, const void *data, size_t datalen, estream_t stream,
npth_t *r_thread, gpg_error_t *err_addr)
{
gpg_error_t err;
@ -210,6 +249,7 @@ start_writer (int fd, const void *data, size_t datalen,
parm->fd = fd;
parm->data = data;
parm->datalen = datalen;
parm->stream = stream;
parm->err_addr = err_addr;
npth_attr_init (&tattr);
@ -239,6 +279,7 @@ struct reader_thread_parms
{
int fd;
membuf_t *mb;
estream_t stream;
gpg_error_t *err_addr;
};
@ -247,6 +288,7 @@ struct reader_thread_parms
static void *
reader_thread_main (void *arg)
{
gpg_error_t err = 0;
struct reader_thread_parms *parm = arg;
char buffer[4096];
int nread;
@ -257,13 +299,33 @@ reader_thread_main (void *arg)
{
if (errno == EINTR)
continue;
*parm->err_addr = gpg_error_from_syserror ();
err = gpg_error_from_syserror ();
break; /* Read error. */
}
put_membuf (parm->mb, buffer, nread);
if (parm->stream)
{
const char *p = buffer;
size_t nwritten;
while (nread)
{
err = es_write (parm->stream, p, nread, &nwritten);
if (err)
{
log_error ("writing stream failed: %s\n",
gpg_strerror (err));
goto leave;
}
nread -= nwritten;
p += nwritten;
}
}
else
put_membuf (parm->mb, buffer, nread);
}
leave:
*parm->err_addr = err;
if (close (parm->fd))
log_error ("closing reader fd %d failed: %s\n", parm->fd, strerror (errno));
xfree (parm);
@ -276,7 +338,8 @@ reader_thread_main (void *arg)
is stored at R_TID. After the thread has finished an error from
the thread will be stored at ERR_ADDR. */
static gpg_error_t
start_reader (int fd, membuf_t *mb, npth_t *r_thread, gpg_error_t *err_addr)
start_reader (int fd, membuf_t *mb, estream_t stream,
npth_t *r_thread, gpg_error_t *err_addr)
{
gpg_error_t err;
struct reader_thread_parms *parm;
@ -292,6 +355,7 @@ start_reader (int fd, membuf_t *mb, npth_t *r_thread, gpg_error_t *err_addr)
return gpg_error_from_syserror ();
parm->fd = fd;
parm->mb = mb;
parm->stream = stream;
parm->err_addr = err_addr;
npth_attr_init (&tattr);
@ -324,8 +388,10 @@ start_reader (int fd, membuf_t *mb, npth_t *r_thread, gpg_error_t *err_addr)
static gpg_error_t
_gpg_encrypt (ctrl_t ctrl, const char *gpg_program,
const void *plain, size_t plainlen,
estream_t plain_stream,
strlist_t keys,
membuf_t *reader_mb)
membuf_t *reader_mb,
estream_t cipher_stream)
{
gpg_error_t err;
assuan_context_t ctx = NULL;
@ -338,6 +404,11 @@ _gpg_encrypt (ctrl_t ctrl, const char *gpg_program,
strlist_t sl;
int ret;
/* Make sure that either the stream interface xor the buffer
interface is used. */
assert ((plain == NULL) != (plain_stream == NULL));
assert ((reader_mb == NULL) != (cipher_stream == NULL));
/* Create two pipes. */
err = gnupg_create_outbound_pipe (outbound_fds);
if (!err)
@ -356,7 +427,7 @@ _gpg_encrypt (ctrl_t ctrl, const char *gpg_program,
close (inbound_fds[1]); inbound_fds[1] = -1;
/* Start a writer thread to feed the INPUT command of the server. */
err = start_writer (outbound_fds[1], plain, plainlen,
err = start_writer (outbound_fds[1], plain, plainlen, plain_stream,
&writer_thread, &writer_err);
if (err)
return err;
@ -364,7 +435,7 @@ _gpg_encrypt (ctrl_t ctrl, const char *gpg_program,
/* Start a reader thread to eat from the OUTPUT command of the
server. */
err = start_reader (inbound_fds[0], reader_mb,
err = start_reader (inbound_fds[0], reader_mb, cipher_stream,
&reader_thread, &reader_err);
if (err)
return err;
@ -458,9 +529,9 @@ gpg_encrypt_blob (ctrl_t ctrl, const char *gpg_program,
init_membuf (&reader_mb, 4096);
err = _gpg_encrypt (ctrl, gpg_program,
plain, plainlen,
plain, plainlen, NULL,
keys,
&reader_mb);
&reader_mb, NULL);
if (! err)
{
@ -478,6 +549,17 @@ gpg_encrypt_blob (ctrl_t ctrl, const char *gpg_program,
return err;
}
gpg_error_t
gpg_encrypt_stream (ctrl_t ctrl, const char *gpg_program,
estream_t plain_stream,
strlist_t keys,
estream_t cipher_stream)
{
return _gpg_encrypt (ctrl, gpg_program,
NULL, 0, plain_stream,
keys,
NULL, cipher_stream);
}
/* Call GPG to decrypt a block of data.
@ -486,7 +568,9 @@ gpg_encrypt_blob (ctrl_t ctrl, const char *gpg_program,
static gpg_error_t
_gpg_decrypt (ctrl_t ctrl, const char *gpg_program,
const void *ciph, size_t ciphlen,
membuf_t *reader_mb)
estream_t cipher_stream,
membuf_t *reader_mb,
estream_t plain_stream)
{
gpg_error_t err;
assuan_context_t ctx = NULL;
@ -497,6 +581,11 @@ _gpg_decrypt (ctrl_t ctrl, const char *gpg_program,
gpg_error_t writer_err, reader_err;
int ret;
/* Make sure that either the stream interface xor the buffer
interface is used. */
assert ((ciph == NULL) != (cipher_stream == NULL));
assert ((reader_mb == NULL) != (plain_stream == NULL));
/* Create two pipes. */
err = gnupg_create_outbound_pipe (outbound_fds);
if (!err)
@ -515,7 +604,7 @@ _gpg_decrypt (ctrl_t ctrl, const char *gpg_program,
close (inbound_fds[1]); inbound_fds[1] = -1;
/* Start a writer thread to feed the INPUT command of the server. */
err = start_writer (outbound_fds[1], ciph, ciphlen,
err = start_writer (outbound_fds[1], ciph, ciphlen, cipher_stream,
&writer_thread, &writer_err);
if (err)
return err;
@ -523,7 +612,7 @@ _gpg_decrypt (ctrl_t ctrl, const char *gpg_program,
/* Start a reader thread to eat from the OUTPUT command of the
server. */
err = start_reader (inbound_fds[0], reader_mb,
err = start_reader (inbound_fds[0], reader_mb, plain_stream,
&reader_thread, &reader_err);
if (err)
return err;
@ -602,8 +691,8 @@ gpg_decrypt_blob (ctrl_t ctrl, const char *gpg_program,
init_membuf_secure (&reader_mb, 1024);
err = _gpg_decrypt (ctrl, gpg_program,
ciph, ciphlen,
&reader_mb);
ciph, ciphlen, NULL,
&reader_mb, NULL);
if (! err)
{
@ -620,3 +709,13 @@ gpg_decrypt_blob (ctrl_t ctrl, const char *gpg_program,
xfree (get_membuf (&reader_mb, NULL));
return err;
}
gpg_error_t
gpg_decrypt_stream (ctrl_t ctrl, const char *gpg_program,
estream_t cipher_stream,
estream_t plain_stream)
{
return _gpg_decrypt (ctrl, gpg_program,
NULL, 0, cipher_stream,
NULL, plain_stream);
}

12
common/call-gpg.h
View File

@ -20,6 +20,8 @@
#ifndef G13_CALL_GPG_H
#define G13_CALL_GPG_H
#include <gpg-error.h>
#include "strlist.h"
typedef struct server_control_s *ctrl_t;
@ -28,10 +30,18 @@ gpg_error_t gpg_encrypt_blob (ctrl_t ctrl, const char *gpg_program,
const void *plain, size_t plainlen,
strlist_t keys,
void **r_ciph, size_t *r_ciphlen);
gpg_error_t gpg_encrypt_stream (ctrl_t ctrl, const char *gpg_program,
estream_t plain_stream,
strlist_t keys,
estream_t cipher_stream);
gpg_error_t gpg_decrypt_blob (ctrl_t ctrl, const char *gpg_program,
const void *ciph, size_t ciphlen,
void **r_plain, size_t *r_plainlen);
gpg_error_t gpg_decrypt_stream (ctrl_t ctrl, const char *gpg_program,
estream_t cipher_stream,
estream_t plain_stream);
#endif /*G13_CALL_GPG_H*/