mapiipc.c 5.38 KB
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <string.h>
#include <errno.h>

#include "mapiipc.h"
#include "debug.h"

#define HAVE_MSGHDR_MSG_CONTROL 1

// this file contains all the client-side IPC related functions

int sock;
int mapidaddr_len;
int fromaddr_len;
struct sockaddr_un mapidaddr;
struct sockaddr_un fromaddr;

void mapiipc_write(struct mapiipcbuf *qbuf)
//Sends an IPC message to mapid
{
  qbuf->uid=getuid();
  if(send(sock, qbuf, sizeof(struct mapiipcbuf), 0) == -1) {
    WARNING_CMD(printf("send: %s [%s:%d]\n",strerror(errno),__FILE__,__LINE__));
    //    exit(1);
  }
}

void mapiipc_read(struct mapiipcbuf *qbuf, long type)
//Reads an IPC message. Blocking call
{
  if(recv(sock, qbuf, MAX_SEND_SIZE, 0) == -1){
    ERROR_CMD(printf("recv: %s [%s:%d]\n",strerror(errno),__FILE__,__LINE__));
    exit(1);
  }
}

void mapiipc_client_init()
//Initializes IPC for mapi functions
{
  if ((sock = socket(AF_LOCAL, SOCK_STREAM, 0)) == -1) {
    ERROR_CMD(printf("socket: %s [%s:%d]\n",strerror(errno),__FILE__,__LINE__));
    exit(1);
  }

  // Construct name of mapid's socket
  mapidaddr.sun_family = AF_LOCAL;
  strcpy(mapidaddr.sun_path, MAPIDSOCK);
  mapidaddr_len = sizeof mapidaddr.sun_family + strlen(mapidaddr.sun_path);

  if (connect(sock, (struct sockaddr *)&mapidaddr, mapidaddr_len) < 0) {     
    ERROR_CMD(printf("connect: %s [%s:%d]\n",strerror(errno),__FILE__,__LINE__));
    exit(EXIT_FAILURE);
  }
}

void mapiipc_client_close()
//Releases socket resources
{
  close(sock);
}


// Helper functions for function arguments retrieval
int getargint(mapiFunctArg **pos){
	int i;
	i = *((int *)(*pos));
	//	printf("getint: %d\n", i);
	(*pos) += sizeof(int);
	return i;
}

char getargchar(mapiFunctArg **pos){
	char c;
	c = *((char *)(*pos));
	//printf("getchar: %c\n", c);
	(*pos) += sizeof(char);
	return c;
}

unsigned long long getargulonglong(mapiFunctArg **pos){
	unsigned long long l;
	l = *((unsigned long long *)(*pos));
	//printf("getulonglong: %lld\n", l);
	(*pos) += sizeof(unsigned long long);
	return l;
}

char * getargstr(mapiFunctArg **pos){
	char *s;
	s = *pos;
	//printf("getstr: %s\n", s);
	(*pos) += strlen(s)+1;
	return s;
}

void addarg(mapiFunctArg **pos, void *arg, int type)
// Helper function for mapi_apply_function()
// pos: current position in message's argument buffer.
// arg: argument to copy into buffer
// type: argument type
{
  switch(type){
    case INT:
      memcpy(*pos, arg, sizeof(int));
      //printf("add_arg: %d\n", *((int *)(*pos)));
      (*pos) += sizeof(int);
      break;
    case CHAR:
      memcpy(*pos, arg, sizeof(char));
      //printf("add_arg: %d\n", *((char *)(*pos)));
      (*pos) += sizeof(char);
      break;
    case UNSIGNED_LONG_LONG:
      memcpy(*pos, arg, sizeof(unsigned long long));
      //printf("add_arg: %llu\n", *((unsigned long long *)(*pos)));
      (*pos) += sizeof(unsigned long long);
      break;
    case STRING:
      memcpy(*pos, arg, strlen((char *)arg)+1);
      //printf("add_arg: %s\n", (char *)(*pos));
      (*pos) += strlen((char *)arg)+1;
      break;
    default:
      break;
  }
}

int mapiipc_send_fd(int sendfd)
{
  struct msghdr	msg;
  struct iovec	iov[1];
  char ptr[2];
  int ret;

#ifdef	HAVE_MSGHDR_MSG_CONTROL
  union {
    struct cmsghdr	cm;
    char control[CMSG_SPACE(sizeof(int))];
  } control_un;
  struct cmsghdr	*cmptr;
  
  msg.msg_control = control_un.control;
  msg.msg_controllen = sizeof(control_un.control);
  
  cmptr = CMSG_FIRSTHDR(&msg);
  cmptr->cmsg_len = CMSG_LEN(sizeof(int));
  cmptr->cmsg_level = SOL_SOCKET;
  cmptr->cmsg_type = SCM_RIGHTS;
  *((int *) CMSG_DATA(cmptr)) = sendfd;
#else
  msg.msg_accrights = (caddr_t) &sendfd;
  msg.msg_accrightslen = sizeof(int);
#endif
    
  iov[0].iov_base = ptr;
  iov[0].iov_len = 2;
  msg.msg_iov = iov;
  msg.msg_iovlen = 1;
  msg.msg_name = NULL;
  msg.msg_namelen = 0;

  ret=sendmsg(sock,&msg,0);
  return(ret);
}


int mapiipc_read_fd(int sock)
{
  struct msghdr	msg;
  struct iovec	iov[1];
  ssize_t n;
  int recvfd;
  char c[2];
  
#ifdef	HAVE_MSGHDR_MSG_CONTROL
  union {
    struct cmsghdr	cm;
    char				control[CMSG_SPACE(sizeof(int))];
  } control_un;
  struct cmsghdr	*cmptr;
  
  msg.msg_control = control_un.control;
  msg.msg_controllen = sizeof(control_un.control);
#else
  msg.msg_accrights = (caddr_t) &newfd;
  msg.msg_accrightslen = sizeof(int);
#endif
  
  iov[0].iov_base = &c;
  iov[0].iov_len = 2;
  msg.msg_iov = iov;
  msg.msg_iovlen = 1;
  msg.msg_name = NULL;
  msg.msg_namelen = 0;
  
  
  if ( (n = recvmsg(sock, &msg, 0)) <= 0)
    return(n);
  
#ifdef	HAVE_MSGHDR_MSG_CONTROL
  if ( (cmptr = CMSG_FIRSTHDR(&msg)) != NULL &&
       cmptr->cmsg_len == CMSG_LEN(sizeof(int))) {
    if (cmptr->cmsg_level != SOL_SOCKET) {
      // err_quit("control level != SOL_SOCKET");
      fprintf(stderr, "control level != SOL_SOCKET");
      return -1;
    }
    if (cmptr->cmsg_type != SCM_RIGHTS) {
      // err_quit("control type != SCM_RIGHTS");
      fprintf(stderr, "control type != SCM_RIGHTS");
      return -1;
    }
    recvfd = *((int *) CMSG_DATA(cmptr));
  } else
    recvfd = -1;		/* descriptor was not passed */
#else
  /* *INDENT-OFF* */
  if (msg.msg_accrightslen == sizeof(int))
    recvfd = newfd;
  else
    recvfd = -1;		/* descriptor was not passed */
  /* *INDENT-ON* */
#endif

  return recvfd;
}