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Annotation of OpenXM/src/ox_toolkit/mysocket.c, Revision 1.6

1.1       ohara       1: /* -*- mode: C; coding: euc-japan -*- */
1.6     ! ohara       2: /* $OpenXM: OpenXM/src/ox_toolkit/mysocket.c,v 1.5 2000/11/30 16:07:35 ohara Exp $ */
1.5       ohara       3: /*
1.3       ohara       4: Q: How to get a local port number?
                      5: A: You do setsockopt() to set options and do socket(), bind().
                      6: An OS set a local port for you.
                      7: In order to get the local port, you need to do getsockname().
                      8: (See [1] pp. 91, pp. 187 for detail)
                      9:
                     10: Reference
1.5       ohara      11: [1] W. Richard Stevens, "UNIX Network Programming", 2nd ed. Vol. 1 (Japanese version)
1.1       ohara      12: */
                     13:
                     14: #include <stdio.h>
                     15: #include <stdlib.h>
                     16: #include <unistd.h>
                     17: #include <errno.h>
                     18: #include <netdb.h>
1.4       ohara      19: #include <string.h>
1.1       ohara      20: #include <netinet/in.h>
                     21: #include <sys/types.h>
                     22: #include <sys/socket.h>
                     23: #include <fcntl.h>
                     24:
                     25: #if defined(__sun__)
                     26: #include <arpa/inet.h>
                     27: #endif
                     28:
                     29: #include "mysocket.h"
                     30:
1.5       ohara      31: typedef struct ox_sockopt {
                     32:     int       level;
                     33:     int       option_name;
                     34:     void*     option_value;
1.6     ! ohara      35:     int       option_len;
1.5       ohara      36: } ox_sockopt;
                     37:
                     38: static int getsocket(struct sockaddr_in *mp, char *host, int port)
1.1       ohara      39: {
                     40:     struct hostent *ent = gethostbyname(host);
1.5       ohara      41:
1.1       ohara      42:     memset(mp, '\0', sizeof(struct sockaddr_in));
                     43:     mp->sin_family = AF_INET;
1.5       ohara      44:     mp->sin_port = htons((short)port);
1.1       ohara      45:     memcpy((char *)&mp->sin_addr, ent->h_addr, ent->h_length);
                     46:
                     47:     return socket(AF_INET, SOCK_STREAM, 0);
                     48: }
                     49:
1.5       ohara      50: static int ox_connect(char *hostname, int port, ox_sockopt *opt)
1.1       ohara      51: {
1.5       ohara      52:     struct sockaddr_in serv;
                     53:     int s = getsocket(&serv, hostname, port);
                     54:     if (connect(s, (struct sockaddr *)&serv, sizeof(serv)) != 0) {
                     55:         fprintf(stderr, "ox_connect: failed. socket = %d, errno = %d\n", s, errno);
                     56:         return -1;
                     57:     }
                     58:     return s;
1.1       ohara      59: }
                     60:
1.5       ohara      61: static int ox_listen(char *hostname, int *port, int backlog, ox_sockopt *opt)
1.1       ohara      62: {
                     63:     struct sockaddr_in me;
1.5       ohara      64:     int s_waiting = getsocket(&me, hostname, *port);
1.1       ohara      65:
1.5       ohara      66:     setsockopt(s_waiting, opt->level, opt->option_name,
                     67:                opt->option_value, opt->option_len);
                     68:     if (bind(s_waiting, (struct sockaddr *)&me, sizeof(me)) < 0
                     69:         || listen(s_waiting, backlog) < 0) {
                     70:         fprintf(stderr, "ox_listen: failed.\n");
                     71:         return -1;
                     72:     }
                     73:     return s_waiting;
                     74: }
1.1       ohara      75:
1.5       ohara      76: static int ox_getport(int s_waiting)
                     77: {
                     78:     struct sockaddr_in me;
                     79:     int len = sizeof(me);
                     80:     if (getsockname(s_waiting, (struct sockaddr *)&me, &len) < 0) {
                     81:         fprintf(stderr, "ox_getport: failed.\n");
                     82:         return -1;
1.1       ohara      83:     }
1.5       ohara      84:     return ntohs(me.sin_port);
                     85: }
1.1       ohara      86:
1.5       ohara      87: int mysocketAccept(int s_waiting)
                     88: {
                     89:     /* return ox_accept(s_waiting); */
                     90:     return accept(s_waiting, NULL, NULL);
                     91: }
1.1       ohara      92:
1.5       ohara      93: int mysocketListen(char *hostname, int *port)
                     94: {
                     95:     int option     = 1;
                     96:     ox_sockopt opt = {SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)};
                     97:     int s_waiting  = ox_listen(hostname, port, 1, &opt);
1.1       ohara      98:
1.5       ohara      99:     if (*port == 0) {
                    100:         *port = ox_getport(s_waiting);
                    101:     }
1.1       ohara     102:     return s_waiting;
                    103: }
                    104:
1.5       ohara     105: int mysocketOpen(char* hostname, int port)
1.1       ohara     106: {
1.5       ohara     107:     return ox_connect(hostname, port, NULL);
1.1       ohara     108: }
                    109:
                    110: #if 0
                    111: int mypipe(char *program, int fd1, int fd2)
                    112: {
                    113:     int sockfd[2];
                    114:     if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockfd) < 0) {
                    115:         fprintf(stderr, "socketpair: fail! errno = %d\n", errno);
                    116:     }
                    117:     if (fork() == 0) {
1.2       ohara     118:         /* child process */
1.1       ohara     119:         close(sockfd[0]);
                    120:         dup2(sockfd[1], fd1);
                    121:         dup2(sockfd[1], fd2);
                    122:         execl(program, program, NULL);
                    123:   }
1.2       ohara     124:   /* parent process */
1.1       ohara     125:     close(sockfd[1]);
                    126:     return sockfd[0];
                    127: }
                    128: #endif