質問編集履歴

書式の改善

2016/07/02 07:53

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monamona154

スコア13

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@@ -6,10 +6,12 @@
 回答お願いします。
+追記 tcpを使用したチャットプログラムを書きました 参考にして修正してもらいたいです
 ```C言語
-コード
 #include <stdio.h>
 #include <stdlib.h>
@@ -434,4 +436,6 @@
     exit(0);
+}
-}```
+```

ふ

2016/07/02 07:53

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monamona154

スコア13

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@@ -434,4 +434,4 @@
     exit(0);
-}
+}```

プログラム

2016/07/02 07:47

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monamona154

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@@ -6,7 +6,9 @@
 回答お願いします。
+```C言語
+コード
 #include <stdio.h>

tcpを使いチャットをできるようにしたプログラムを追記

2016/07/02 07:46

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monamona154

スコア13

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@@ -5,3 +5,431 @@
 1~9の数字を打つと九九を表示する簡単なプログラムは出来るのですが、これをクライアントとサーバ間でやる方法がわかりません。
 回答お願いします。
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#define PORT 20007
+#define BUF_SIZE 0x1000
+ static void server(int port){
+    struct sockaddr_in sin;
+    fd_set rfds;
+    int ld, sd[5], len, max,x,y;
+    char *buf, str[256];
+    if ((buf = malloc(BUF_SIZE)) == NULL) {
+	perror("malloc");
+	return;
+    }
+for(x=0;x<5;x++) sd[x] =  -1;
+    if ((ld = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
+	perror("socket");
+	goto close_and_end;
+    }
+    memset(&sin, 0, sizeof(sin));
+    sin.sin_family = AF_INET;
+    sin.sin_port = htons(port);
+    if (bind(ld, (struct sockaddr*)&sin, sizeof(sin)) < 0) {
+	perror("bind");
+	goto close_and_end;
+    }
+    if (listen(ld, 3) < 0) {
+	perror("listen");
+	goto close_and_end;
+    }
+ loop:
+    FD_ZERO(&rfds);
+    FD_SET(ld, &rfds);
+    max = ld;
+for(x=0;x<5;x++){
+    if (sd[x] >= 0) {
+	FD_SET(sd[x], &rfds);
+	if (max < sd[x]) max = sd[x];
+    }
+ }
+    select(max + 1, &rfds, NULL, NULL, NULL);
+for(x=0;x<5;x++){
+    if (sd[x] > 0 && FD_ISSET(sd[x], &rfds)) {
+	if ((len = read(sd[x], buf, BUF_SIZE)) > 0) {
+	    if (write(sd[x], buf, len) < 0) {
+		close(sd[x]);
+		sd[x] = -1;
+	    }
+for(y=0;y<5;y++){
+  if(x!=y){
+	    if (sd[y] > 0) {
+		if (write(sd[y], buf, len) < 0) {
+		    close(sd[y]);
+		    sd[y] = -1;
+		}
+	    }
+  }
+ }
+	}
+	 else {
+	    if (len < 0) perror("read");
+	    close(sd[x]);
+	    sd[x] = -1;
+	}
+    }
+ }
+    if (FD_ISSET(ld, &rfds)) {
+	int tmpd;
+	len = sizeof(sin);
+	if ((tmpd = accept(ld, (struct sockaddr*)&sin,   (socklen_t*)&len))
+	    < 0) {
+	    perror("accept");
+	    goto close_and_end;
+	}
+	inet_ntop(AF_INET, &sin.sin_addr.s_addr, str, sizeof (str));
+	printf("connected from %s\n", str);
+	if(sd[0]<0)
+	  sd[0]=tmpd;
+	else if(sd[1]<0)
+	  sd[1]=tmpd;
+	else if(sd[2]<0)
+	  sd[2]=tmpd;
+	else if(sd[3]<0)
+	  sd[3]=tmpd;
+	else if(sd[4]<0)
+	  sd[4]=tmpd;
+	else if(sd[5]<0)
+	  sd[5]=tmpd;
+	else{
+	  strcpy(buf, "Server too busy\n");
+	  send(tmpd, buf, strlen(buf), 0);
+	  close(tmpd);
+	}
+    }
+    goto loop;
+ close_and_end:
+    for(x=0;x<5;x++){
+    if (sd[x] >= 0) close(sd[x]);
+    if (ld >= 0) close(ld);
+    }
+    free(buf);
+}
+ static void client(unsigned int ip, int port){
+    struct sockaddr_in sin;
+    char *buf;
+    int sd, len, i;
+    fd_set rfds;
+    int max;
+    if ((buf = malloc(BUF_SIZE)) == NULL) {
+	perror("malloc");
+	return;
+    }
+    if ((sd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
+	perror("socket");
+	goto close_and_end;
+    }
+    memset(&sin, 0, sizeof(sin));
+    sin.sin_family = AF_INET;
+    sin.sin_port = htons(port);
+    sin.sin_addr.s_addr = htonl(ip);
+    if (connect(sd, (struct sockaddr*)&sin, sizeof(sin)) < 0) {
+	perror("connect");
+	goto close_and_end;
+    }
+loop:
+    FD_ZERO(&rfds);
+    max=1;
+    if (0 < sd){
+      FD_SET(sd, &rfds);
+      if(max<sd) max = sd;
+    }
+    FD_SET(0, &rfds);
+    select(max + 1, &rfds, NULL, NULL, NULL);
+    if(FD_ISSET(0, &rfds)){
+        if (fgets(buf, BUF_SIZE, stdin) <= 0)
+	    goto close_and_end;
+        len = strlen(buf);
+        if (send(sd, buf, len, 0) < 0) {
+	    perror("send");
+	    goto close_and_end;
+        }
+    }
+    if(FD_ISSET(sd, &rfds)){
+        len = recv(sd, buf, BUF_SIZE, 0);
+        if (len <= 0) {
+	    if (len < 0) perror("send");
+	    goto close_and_end;
+        }
+        for (i = 0; i < len; i++) putchar(buf[i]);
+    }
+    goto loop;
+ close_and_end:
+    if (sd >= STDIN_FILENO) close(sd);
+    if (sd >= 0) close(sd);
+    free(buf);
+}
+ static void usage(void){
+    printf("server mode: tcp2 -s\n");
+    printf("client mode: tcp2 -c\n");
+    exit(0);
+}
+ int main(int argc, char **argv, char **env){
+    if (argc != 2) usage();
+    if (argv[1][0] != '-') usage();
+    switch (argv[1][1]) {
+    case 's':
+	server(PORT);
+	break;
+    case 'c':
+    {
+	struct hostent *ent;
+	ent = gethostbyname("localhost");
+	client(ntohl(*(int*)ent->h_addr_list[0]), PORT);
+	break;
+    }
+    default:
+	usage();
+    }
+    exit(0);
+}