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msg format

more_to_read
Philippe PITTOLI 2016-12-21 01:26:47 +01:00
parent 0419ab4645
commit 1e44f3d00f
7 changed files with 249 additions and 99 deletions
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90
core/communication.c
View File

@ -1,20 +1,16 @@
#include "communication.h"
#include "usocket.h"
#include "msg-format.h"
#include "utils.h"
#include "error.h"
#include <assert.h>
#include <stdio.h>
#include <errno.h>
#define handle_error(msg) \
do { perror(msg); exit(EXIT_FAILURE); } while (0)
#define handle_err(fun,msg)\
fprintf (stderr, "%s: file %s line %d %s\n", fun, __FILE__, __LINE__, msg);
void service_path (char *path, const char *sname, int index, int version)
{
assert (path != NULL);
assert (sname != NULL);
memset (path, 0, PATH_MAX);
snprintf (path, PATH_MAX, "%s/%s-%d-%d", TMPDIR, sname, index, version);
}
@ -43,21 +39,24 @@ int srv_init (int argc, char **argv, char **env
return 0;
}
// TODO
int srv_accept (struct service *srv, struct process *p)
{
assert (srv != NULL);
assert (p != NULL);
usock_accept (srv->service_fd, &p->proc_fd);
char *buf = NULL;
size_t msgsize = BUFSIZ;
srv_read (p, &buf, &msgsize);
struct msg m_con;
memset (&m_con, 0, sizeof (struct msg));
srv_read (p, &m_con);
// TODO: handle the parameters in the first message
msg_free (&m_con);
msgsize = 0;
msg_format_ack (buf, NULL, &msgsize);
srv_write (p, buf, msgsize);
free (buf);
struct msg m_ack;
memset (&m_ack, 0, sizeof (struct msg));
msg_format_ack (&m_ack, NULL, 0);
srv_write (p, &m_ack);
msg_free (&m_ack);
return 0;
}
@ -70,17 +69,24 @@ int srv_close (struct service *srv)
int srv_close_proc (struct process *p)
{
struct msg m;
memset (&m, 0, sizeof (struct msg));
m.type = MSG_TYPE_DIS;
if (msg_write (p->proc_fd, &m) < 0) {
handle_err ("srv_close_proc", "msg_write < 0");
}
return usock_close (p->proc_fd);
}
int srv_read (const struct process *p, char **buf, size_t *msize)
int srv_read (const struct process *p, struct msg *m)
{
return usock_recv (p->proc_fd, buf, msize);
return msg_read (p->proc_fd, m);
}
int srv_write (const struct process *p, const char * buf, size_t msize)
int srv_write (const struct process *p, const struct msg *m)
{
return usock_send (p->proc_fd, buf, msize);
return msg_write (p->proc_fd, m);
}
int app_connection (int argc, char **argv, char **env
@ -103,40 +109,50 @@ int app_connection (int argc, char **argv, char **env
usock_connect (&srv->service_fd, srv->spath);
// TODO: connection algorithm
// send connection string and receive acknowledgement
char send_buffer [BUFSIZ];
memset (send_buffer, 0, BUFSIZ);
if (msg_format_con (send_buffer, connectionstr, &msize) < 0) {
struct msg m_con;
memset (&m_con, 0, sizeof (struct msg));
// format the connection msg
if (msg_format_con (&m_con, connectionstr, msize) < 0) {
handle_err ("app_connection", "msg_format_con");
return -1;
}
app_write (srv, send_buffer, msize);
char *buffer = NULL;
size_t read_msg_size = BUFSIZ;
// send connection msg
app_write (srv, &m_con);
msg_free (&m_con);
app_read (srv, &buffer, &read_msg_size);
// receive ack msg
struct msg m_ack;
memset (&m_ack, 0, sizeof (struct msg));
app_read (srv, &m_ack);
assert (buffer[0] == MSG_TYPE_ACK);
assert (read_msg_size == 3);
free (buffer);
assert (m_ack.type == MSG_TYPE_ACK);
assert (m_ack.valsize == 0);
msg_free (&m_ack);
return 0;
}
int app_close (struct service *srv)
{
struct msg m;
memset (&m, 0, sizeof (struct msg));
m.type = MSG_TYPE_DIS;
if (msg_write (srv->service_fd, &m) < 0) {
handle_err ("app_close", "msg_write < 0");
}
return usock_close (srv->service_fd);
}
int app_read (struct service *srv, char ** buf, size_t *msize)
int app_read (struct service *srv, struct msg *m)
{
return usock_recv (srv->service_fd, buf, msize);
return msg_read (srv->service_fd, m);
}
int app_write (struct service *srv, char * buf, size_t msize)
int app_write (struct service *srv, const struct msg *m)
{
return usock_send (srv->service_fd, buf, msize);
return msg_write (srv->service_fd, m);
}

15
core/communication.h
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@ -5,17 +5,12 @@
#include <stdlib.h>
#include <string.h>
#include <errno.h> // error numbers
#include "msg.h"
#include "process.h"
#define COMMUNICATION_VERSION 1
#define ER_FILE_OPEN 1
#define ER_FILE_CLOSE 2
#define ER_FILE_READ 3
#define ER_FILE_WRITE 4
#define ER_FILE_WRITE_PARAMS 5
#define ER_MEM_ALLOC 100
#define ER_PARAMS 101
@ -41,8 +36,8 @@ int srv_close (struct service *srv);
int srv_close_proc (struct process *p);
int srv_accept (struct service *srv, struct process *p);
int srv_read (const struct process *, char **buf, size_t *msize);
int srv_write (const struct process *, const char * buf, size_t);
int srv_read (const struct process *, struct msg *m);
int srv_write (const struct process *, const struct msg *m);
// APPLICATION
@ -53,7 +48,7 @@ int app_connection (int argc, char **argv, char **env
, struct service *, const char *, const char *, size_t);
int app_close (struct service *);
int app_read (struct service *srv, char ** buf, size_t *msize);
int app_write (struct service *, char * buf, size_t msize);
int app_read (struct service *srv, struct msg *m);
int app_write (struct service *, const struct msg *m);
#endif

10
core/error.h Normal file
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@ -0,0 +1,10 @@
#ifndef __ERROR_H__
#define __ERROR_H__
#define handle_error(msg) \
do { perror(msg); exit(EXIT_FAILURE); } while (0)
#define handle_err(fun,msg)\
fprintf (stderr, "%s: file %s line %d %s\n", fun, __FILE__, __LINE__, msg);
#endif

39
core/msg-format.c
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@ -1,39 +0,0 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "msg-format.h"
#define handle_err(fun,msg)\
fprintf (stderr, "%s: file %s line %d %s\n", fun, __FILE__, __LINE__, msg);
// [type] [len] [val]
// 3 valsize constr
int msg_format_con (char *buf, const char *constr, size_t *msgsize)
{
assert (buf != NULL);
assert (*msgsize + 3 <= BUFSIZ);
if (*msgsize + 3 > BUFSIZ) {
handle_err ("msg_format_con", "msgsize > BUFSIZ");
return 1;
}
buf[0] = MSG_TYPE_CON;
short final_size = (short) *msgsize;
memcpy (buf + 1, &final_size, 2);
memcpy (buf + 3, constr, *msgsize);
*msgsize += 3;
return 0;
}
// [type] [len]
// 4 0
int msg_format_ack (char *buf, const char *constr, size_t *msgsize)
{
assert (buf != NULL);
memset(buf, 0, 3);
buf[0] = MSG_TYPE_ACK;
*msgsize += 3;
return 0;
}

13
core/msg-format.h
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@ -1,13 +0,0 @@
#ifndef __MSG_FORMAT_H__
#define __MSG_FORMAT_H__
#include <assert.h>
#define MSG_TYPE_CON 1
#define MSG_TYPE_ERR 2
#define MSG_TYPE_ACK 4
int msg_format_con (char *buf, const char *constr, size_t *msgsize);
int msg_format_ack (char *buf, const char *constr, size_t *msgsize);
#endif

145
core/msg.c Normal file
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@ -0,0 +1,145 @@
#include "msg.h"
#include "error.h"
#include "usocket.h"
#include <assert.h>
int msg_format_read (struct msg *m, const char *buf, size_t msize)
{
assert (m != NULL);
assert (buf != NULL);
assert (msize >= 3);
assert (msize <= BUFSIZ - 3);
if (m == NULL)
return -1;
m->type = buf[0];
memcpy (&m->valsize, buf+1, 2);
assert (m->valsize <= BUFSIZ -3);
if (m->val != NULL)
free (m->val), m->val = NULL;
if (m->val == NULL) {
m->val = malloc (m->valsize);
memcpy (m->val, buf+3, m->valsize);
}
return 0;
}
int msg_format_write (struct msg *m, char **buf, size_t *msize)
{
assert (m != NULL);
assert (buf != NULL);
assert (msize != NULL);
assert (m->valsize <= BUFSIZ -3);
if (m == NULL)
return -1;
if (buf == NULL)
return -2;
if (msize == NULL)
return -3;
char *buffer = *buf;
buffer[0] = m->type;
memcpy (buffer + 1, &m->valsize, 2);
memcpy (buffer + 3, &m->val, (m->valsize <= BUFSIZ) ? m->valsize : BUFSIZ);
return 0;
}
int msg_read (int fd, struct msg *m)
{
assert (m != NULL);
char *buf = NULL;
size_t msize = 0;
int ret = usock_recv (fd, &buf, &msize);
if (ret < 0) {
handle_err ("msg_read", "usock_recv");
return ret;
}
if (msg_format_read (m, buf, msize) < 0) {
return -1;
}
free (buf);
return 0;
}
int msg_write (int fd, const struct msg *m)
{
assert (m != NULL);
char *buf = NULL;
size_t msize = 0;
msg_format_write (m, &buf, &msize);
int ret = usock_send (fd, buf, msize);
if (ret < 0) {
handle_err ("msg_write", "usock_send");
return ret;
}
if (buf != NULL)
free (buf);
return 0;
}
// MSG FORMAT
int msg_format (struct msg *m, char type, const char *val, size_t valsize)
{
assert (m != NULL);
assert (valsize + 3 <= BUFSIZ);
assert (valsize == 0 && val == NULL || valsize > 0 && val != NULL);
if (valsize + 3 > BUFSIZ) {
handle_err ("msg_format_con", "msgsize > BUFSIZ");
return -1;
}
m->type = type;
m->valsize = (short) valsize;
memcpy (m->val, val, valsize);
return 0;
}
int msg_format_con (struct msg *m, const char *val, size_t valsize)
{
return msg_format (m, MSG_TYPE_CON, val, valsize);
}
int msg_format_data (struct msg *m, const char *val, size_t valsize)
{
return msg_format (m, MSG_TYPE_DATA, val, valsize);
}
int msg_format_ack (struct msg *m, const char *val, size_t valsize)
{
return msg_format (m, MSG_TYPE_ACK, val, valsize);
}
int msg_free (struct msg *m)
{
assert (m != NULL);
if (m == NULL)
return -1;
if (m->val != NULL)
free (m->val);
return 0;
}

36
core/msg.h Normal file
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@ -0,0 +1,36 @@
#ifndef __MSG_H__
#define __MSG_H__
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MSG_TYPE_CON 1
#define MSG_TYPE_DIS 2
#define MSG_TYPE_ERR 3
#define MSG_TYPE_ACK 4
#define MSG_TYPE_DATA 5
struct msg {
char type;
short valsize;
char *val;
};
// used to create msg structure from buffer
int msg_format_read (struct msg *m, const char *buf, size_t msize);
// used to create buffer from msg structure
int msg_format_write (struct msg *m, char **buf, size_t *msize);
// read a structure msg from fd
int msg_read (int fd, struct msg *m);
// write a structure msg to fd
int msg_write (int fd, const struct msg *m);
int msg_format_con (struct msg *m, const char *val, size_t valsize);
int msg_format_data (struct msg *m, const char *val, size_t valsize);
int msg_format_ack (struct msg *m, const char *val, size_t valsize);
int msg_free (struct msg *m);
#endif