NeoMutt  2023-05-17-56-ga67199
Teaching an old dog new tricks
DOXYGEN
socket.c File Reference

Low-level socket handling. More...

#include "config.h"
#include <errno.h>
#include <stdbool.h>
#include <string.h>
#include <time.h>
#include "private.h"
#include "mutt/lib.h"
#include "config/lib.h"
#include "core/lib.h"
#include "socket.h"
#include "connaccount.h"
#include "connection.h"
#include "protos.h"
#include "ssl.h"
+ Include dependency graph for socket.c:

Go to the source code of this file.

Functions

static int socket_preconnect (void)
 Execute a command before opening a socket. More...
 
int mutt_socket_open (struct Connection *conn)
 Simple wrapper. More...
 
int mutt_socket_close (struct Connection *conn)
 Close a socket. More...
 
int mutt_socket_read (struct Connection *conn, char *buf, size_t len)
 Read from a Connection. More...
 
int mutt_socket_write (struct Connection *conn, const char *buf, size_t len)
 Write to a Connection. More...
 
int mutt_socket_write_d (struct Connection *conn, const char *buf, int len, int dbg)
 Write data to a socket. More...
 
int mutt_socket_poll (struct Connection *conn, time_t wait_secs)
 Checks whether reads would block. More...
 
int mutt_socket_readchar (struct Connection *conn, char *c)
 Simple read buffering to speed things up. More...
 
int mutt_socket_readln_d (char *buf, size_t buflen, struct Connection *conn, int dbg)
 Read a line from a socket. More...
 
struct Connectionmutt_socket_new (enum ConnectionType type)
 Allocate and initialise a new connection. More...
 
void mutt_socket_empty (struct Connection *conn)
 Clear out any queued data. More...
 
int mutt_socket_buffer_readln_d (struct Buffer *buf, struct Connection *conn, int dbg)
 Read a line from a socket into a Buffer. More...
 

Detailed Description

Low-level socket handling.

Authors
  • Michael R. Elkins
  • Brendan Cully
  • Tommi Komulainen

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/.

Definition in file socket.c.

Function Documentation

◆ socket_preconnect()

static int socket_preconnect ( void  )
static

Execute a command before opening a socket.

Return values
0Success
>0An errno, e.g. EPERM

Definition at line 51 of file socket.c.

52{
53 const char *const c_preconnect = cs_subset_string(NeoMutt->sub, "preconnect");
54 if (!c_preconnect)
55 return 0;
56
57 mutt_debug(LL_DEBUG2, "Executing preconnect: %s\n", c_preconnect);
58 const int rc = mutt_system(c_preconnect);
59 mutt_debug(LL_DEBUG2, "Preconnect result: %d\n", rc);
60 if (rc != 0)
61 {
62 const int save_errno = errno;
63 mutt_perror(_("Preconnect command failed"));
64
65 return save_errno;
66 }
67
68 return 0;
69}
const char * cs_subset_string(const struct ConfigSubset *sub, const char *name)
Get a string config item by name.
Definition: helpers.c:317
#define mutt_debug(LEVEL,...)
Definition: logging2.h:87
#define mutt_perror(...)
Definition: logging2.h:91
@ LL_DEBUG2
Log at debug level 2.
Definition: logging2.h:44
#define _(a)
Definition: message.h:28
int mutt_system(const char *cmd)
Run an external command.
Definition: system.c:52
Container for Accounts, Notifications.
Definition: neomutt.h:37
struct ConfigSubset * sub
Inherited config items.
Definition: neomutt.h:39
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◆ mutt_socket_open()

int mutt_socket_open ( struct Connection conn)

Simple wrapper.

Parameters
connConnection to a server
Return values
0Success
-1Error

Definition at line 77 of file socket.c.

78{
79 int rc;
80
82 return -1;
83
84 rc = conn->open(conn);
85
86 if (rc >= 0)
87 {
88 mutt_debug(LL_DEBUG2, "Connected to %s:%d on fd=%d\n", conn->account.host,
89 conn->account.port, conn->fd);
90 }
91
92 return rc;
93}
static int socket_preconnect(void)
Execute a command before opening a socket.
Definition: socket.c:51
char host[128]
Server to login to.
Definition: connaccount.h:54
unsigned short port
Port to connect to.
Definition: connaccount.h:58
struct ConnAccount account
Account details: username, password, etc.
Definition: connection.h:50
int(* open)(struct Connection *conn)
Definition: connection.h:67
int fd
Socket file descriptor.
Definition: connection.h:54
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◆ mutt_socket_close()

int mutt_socket_close ( struct Connection conn)

Close a socket.

Parameters
connConnection to a server
Return values
0Success
-1Error

Definition at line 101 of file socket.c.

102{
103 if (!conn)
104 return 0;
105
106 int rc = -1;
107
108 if (conn->fd < 0)
109 mutt_debug(LL_DEBUG1, "Attempt to close closed connection\n");
110 else
111 rc = conn->close(conn);
112
113 conn->fd = -1;
114 conn->ssf = 0;
115 conn->bufpos = 0;
116 conn->available = 0;
117
118 return rc;
119}
@ LL_DEBUG1
Log at debug level 1.
Definition: logging2.h:43
unsigned int ssf
Security strength factor, in bits (see notes)
Definition: connection.h:51
int bufpos
Current position in the buffer.
Definition: connection.h:53
int(* close)(struct Connection *conn)
Definition: connection.h:117
int available
Amount of data waiting to be read.
Definition: connection.h:55
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◆ mutt_socket_read()

int mutt_socket_read ( struct Connection conn,
char *  buf,
size_t  len 
)

Read from a Connection.

Parameters
connConnection a server
bufBuffer to store read data
lenlength of the buffer
Return values
>0Success, number of bytes read
-1Error, see errno

Definition at line 129 of file socket.c.

130{
131 return conn->read(conn, buf, len);
132}
int(* read)(struct Connection *conn, char *buf, size_t count)
Definition: connection.h:80
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◆ mutt_socket_write()

int mutt_socket_write ( struct Connection conn,
const char *  buf,
size_t  len 
)

Write to a Connection.

Parameters
connConnection to a server
bufBuffer with data to write
lenLength of data to write
Return values
>0Number of bytes written
-1Error

Definition at line 142 of file socket.c.

143{
144 return conn->write(conn, buf, len);
145}
int(* write)(struct Connection *conn, const char *buf, size_t count)
Definition: connection.h:93

◆ mutt_socket_write_d()

int mutt_socket_write_d ( struct Connection conn,
const char *  buf,
int  len,
int  dbg 
)

Write data to a socket.

Parameters
connConnection to a server
bufBuffer with data to write
lenLength of data to write
dbgDebug level for logging
Return values
>0Number of bytes written
-1Error

Definition at line 156 of file socket.c.

157{
158 int sent = 0;
159
160 mutt_debug(dbg, "%d> %s", conn->fd, buf);
161
162 if (conn->fd < 0)
163 {
164 mutt_debug(LL_DEBUG1, "attempt to write to closed connection\n");
165 return -1;
166 }
167
168 while (sent < len)
169 {
170 const int rc = conn->write(conn, buf + sent, len - sent);
171 if (rc < 0)
172 {
173 mutt_debug(LL_DEBUG1, "error writing (%s), closing socket\n", strerror(errno));
174 mutt_socket_close(conn);
175
176 return -1;
177 }
178
179 if (rc < len - sent)
180 mutt_debug(LL_DEBUG3, "short write (%d of %d bytes)\n", rc, len - sent);
181
182 sent += rc;
183 }
184
185 return sent;
186}
@ LL_DEBUG3
Log at debug level 3.
Definition: logging2.h:45
int mutt_socket_close(struct Connection *conn)
Close a socket.
Definition: socket.c:101
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◆ mutt_socket_poll()

int mutt_socket_poll ( struct Connection conn,
time_t  wait_secs 
)

Checks whether reads would block.

Parameters
connConnection to a server
wait_secsHow long to wait for a response
Return values
>0There is data to read
0Read would block
-1Connection doesn't support polling

Definition at line 196 of file socket.c.

197{
198 if (conn->bufpos < conn->available)
199 return conn->available - conn->bufpos;
200
201 if (conn->poll)
202 return conn->poll(conn, wait_secs);
203
204 return -1;
205}
int(* poll)(struct Connection *conn, time_t wait_secs)
Definition: connection.h:106
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◆ mutt_socket_readchar()

int mutt_socket_readchar ( struct Connection conn,
char *  c 
)

Simple read buffering to speed things up.

Parameters
[in]connConnection to a server
[out]cCharacter that was read
Return values
1Success
-1Error

Definition at line 214 of file socket.c.

215{
216 if (conn->bufpos >= conn->available)
217 {
218 if (conn->fd >= 0)
219 {
220 conn->available = conn->read(conn, conn->inbuf, sizeof(conn->inbuf));
221 }
222 else
223 {
224 mutt_debug(LL_DEBUG1, "attempt to read from closed connection\n");
225 return -1;
226 }
227 conn->bufpos = 0;
228 if (conn->available == 0)
229 {
230 mutt_error(_("Connection to %s closed"), conn->account.host);
231 }
232 if (conn->available <= 0)
233 {
234 mutt_socket_close(conn);
235 return -1;
236 }
237 }
238 *c = conn->inbuf[conn->bufpos];
239 conn->bufpos++;
240 return 1;
241}
#define mutt_error(...)
Definition: logging2.h:90
char inbuf[1024]
Buffer for incoming traffic.
Definition: connection.h:52
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◆ mutt_socket_readln_d()

int mutt_socket_readln_d ( char *  buf,
size_t  buflen,
struct Connection conn,
int  dbg 
)

Read a line from a socket.

Parameters
bufBuffer to store the line
buflenLength of data to write
connConnection to a server
dbgDebug level for logging
Return values
>0Success, number of bytes read
-1Error

Definition at line 252 of file socket.c.

253{
254 char ch;
255 int i;
256
257 for (i = 0; i < buflen - 1; i++)
258 {
259 if (mutt_socket_readchar(conn, &ch) != 1)
260 {
261 buf[i] = '\0';
262 return -1;
263 }
264
265 if (ch == '\n')
266 break;
267 buf[i] = ch;
268 }
269
270 /* strip \r from \r\n termination */
271 if (i && (buf[i - 1] == '\r'))
272 i--;
273 buf[i] = '\0';
274
275 mutt_debug(dbg, "%d< %s\n", conn->fd, buf);
276
277 /* number of bytes read, not strlen */
278 return i + 1;
279}
int mutt_socket_readchar(struct Connection *conn, char *c)
Simple read buffering to speed things up.
Definition: socket.c:214
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◆ mutt_socket_new()

struct Connection * mutt_socket_new ( enum ConnectionType  type)

Allocate and initialise a new connection.

Parameters
typeType of the new Connection
Return values
ptrNew Connection

Definition at line 286 of file socket.c.

287{
288 struct Connection *conn = mutt_mem_calloc(1, sizeof(struct Connection));
289 conn->fd = -1;
290
291 if (type == MUTT_CONNECTION_TUNNEL)
292 {
294 }
295 else if (type == MUTT_CONNECTION_SSL)
296 {
297 int rc = mutt_ssl_socket_setup(conn);
298 if (rc < 0)
299 FREE(&conn);
300 }
301 else
302 {
303 conn->read = raw_socket_read;
304 conn->write = raw_socket_write;
305 conn->open = raw_socket_open;
306 conn->close = raw_socket_close;
307 conn->poll = raw_socket_poll;
308 }
309
310 return conn;
311}
void mutt_tunnel_socket_setup(struct Connection *conn)
Sets up tunnel connection functions.
Definition: tunnel.c:240
int mutt_ssl_socket_setup(struct Connection *conn)
Set up SSL socket mulitplexor.
Definition: gnutls.c:1120
int raw_socket_close(struct Connection *conn)
Close a socket - Implements Connection::close() -.
Definition: raw.c:378
int raw_socket_open(struct Connection *conn)
Open a socket - Implements Connection::open() -.
Definition: raw.c:129
int raw_socket_poll(struct Connection *conn, time_t wait_secs)
Checks whether reads would block - Implements Connection::poll() -.
Definition: raw.c:340
int raw_socket_read(struct Connection *conn, char *buf, size_t len)
Read data from a socket - Implements Connection::read() -.
Definition: raw.c:280
int raw_socket_write(struct Connection *conn, const char *buf, size_t count)
Write data to a socket - Implements Connection::write() -.
Definition: raw.c:310
void * mutt_mem_calloc(size_t nmemb, size_t size)
Allocate zeroed memory on the heap.
Definition: memory.c:50
#define FREE(x)
Definition: memory.h:43
@ MUTT_CONNECTION_SSL
SSL/TLS-encrypted connection.
Definition: socket.h:39
@ MUTT_CONNECTION_TUNNEL
Tunnelled connection.
Definition: socket.h:38
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◆ mutt_socket_empty()

void mutt_socket_empty ( struct Connection conn)

Clear out any queued data.

Parameters
connConnection to a server

The internal buffer is emptied and any data that has already arrived at this machine (in kernel buffers) is read and dropped.

Definition at line 320 of file socket.c.

321{
322 if (!conn)
323 return;
324
325 char buf[1024] = { 0 };
326 int bytes;
327
328 while ((bytes = mutt_socket_poll(conn, 0)) > 0)
329 {
330 mutt_socket_read(conn, buf, MIN(bytes, sizeof(buf)));
331 }
332}
#define MIN(a, b)
Definition: memory.h:31
int mutt_socket_poll(struct Connection *conn, time_t wait_secs)
Checks whether reads would block.
Definition: socket.c:196
int mutt_socket_read(struct Connection *conn, char *buf, size_t len)
Read from a Connection.
Definition: socket.c:129
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◆ mutt_socket_buffer_readln_d()

int mutt_socket_buffer_readln_d ( struct Buffer buf,
struct Connection conn,
int  dbg 
)

Read a line from a socket into a Buffer.

Parameters
bufBuffer to store the line
connConnection to a server
dbgDebug level for logging
Return values
>0Success, number of bytes read
-1Error

Definition at line 342 of file socket.c.

343{
344 char ch;
345 bool has_cr = false;
346
347 buf_reset(buf);
348
349 while (true)
350 {
351 if (mutt_socket_readchar(conn, &ch) != 1)
352 return -1;
353
354 if (ch == '\n')
355 break;
356
357 if (has_cr)
358 {
359 buf_addch(buf, '\r');
360 has_cr = false;
361 }
362
363 if (ch == '\r')
364 has_cr = true;
365 else
366 buf_addch(buf, ch);
367 }
368
369 mutt_debug(dbg, "%d< %s\n", conn->fd, buf_string(buf));
370 return 0;
371}
void buf_reset(struct Buffer *buf)
Reset an existing Buffer.
Definition: buffer.c:88
size_t buf_addch(struct Buffer *buf, char c)
Add a single character to a Buffer.
Definition: buffer.c:253
static const char * buf_string(const struct Buffer *buf)
Convert a buffer to a const char * "string".
Definition: buffer.h:90
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