String/argument error in my test-server

Firstly, i'm really new to all this C/bash/unix stuff so i will probably get some word meanings wrong here, but anyway:

Im trying to make a client pass simple shell commands to the server, which executes them. They communicate locally on the same machine through a socket.

I can make the server perform "ls -l" and "mkdir test" for example, but not "ls", e.g just one argument.

If i only send one command like "ls", the server will try "ls ¤"#"#%" <-- random data. So i think it's really a string problem. I've tried different ideas for a week now, but i am not closer to a solution, and my C-programming skills are not that good at all, so i thought i try asking for some help.


Server:

	#include <unistd.h>

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>

#define SOCK_PATH "echo_socket"

int main(void)
{
	int s, s2, t, len;
	struct sockaddr_un local, remote;
	char str[100];
	char* arg_list[222];
	char str1[100], str2[100];

	if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
		perror("socket");
		exit(1);
	}

	local.sun_family = AF_UNIX;
	strcpy(local.sun_path, SOCK_PATH);
	unlink(local.sun_path);
	len = strlen(local.sun_path) + sizeof(local.sun_family);
	if (bind(s, (struct sockaddr *)&local, len) == -1) {
		perror("bind");
		exit(1);
	}

	if (listen(s, 5) == -1) {
		perror("listen");
		exit(1);
	}

	for(;;)/>/> {
		int active,done, sent, n;
		printf("Waiting for a connection...\n");
		t = sizeof(remote);
		if ((s2 = accept(s, (struct sockaddr *)&remote, &t)) == -1) {
			perror("accept");
			exit(1);
		}

		printf("Connected.\n");
		active = 0;
		done = 0;
		sent = 0;
		do {
			n = recv(s2, str, 100, 0);
			if (n <= 0) {
				if (n < 0) perror("recv");
				done = 1;
			}


			str[strcspn ( str, "\n" )] = '\0';
			strcpy(str1,str);

			int i=0,k=0;

			while (str1[i] != ' ')
				i++;

			while (str1[i] != '\0'){
				str2[k] = str1[i+1];
				k++;
				i++;
			}

			i=0;

			while (str1[i] != ' ')
				i++;

			str1[i] = '\0';


			int spawn (char* program, char** arg_list)
			{
				pid_t child_pid;
				child_pid = fork ();
				if (child_pid != 0)
					return child_pid;

				else{
					execvp (program, arg_list);
				}
				fprintf (stderr, "an error occurred in execvp\n");
				abort ();




				char* arg_list[222];
				char kommando[222];
				char * tmp;

				i=0;

				tmp = strtok (kommando," ");
				arg_list[0] = tmp;
				while (tmp != NULL)
				{
					tmp = strtok (NULL, " ");
					arg_list[i+1] = tmp;
					i++;
				}

				char* arg[] = {
						str1,
						str2,
						NULL
				};


				spawn (str1, arg);


				if (!done && sent == 0 && active == 0)
					if (send(s2, str, n, 0) < 0) {
						perror("send");
						sent = 1;
					}

				if (!done && sent == 0 && active == 1)
					if (send(s2, str, n, 0) < 0) {
						perror("send");
						sent = 1;
					}
				sent = 0;
			} while (!done);

			close(s2);
		}

		return 0;
	}

Client:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>

#define SOCK_PATH "echo_socket"

int main(void)
{
	int s, t, len;
	struct sockaddr_un remote;
	char str[100];

	if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
		perror("socket");
		exit(1);
	}

	printf("Trying to connect...\n");

	remote.sun_family = AF_UNIX;
	strcpy(remote.sun_path, SOCK_PATH);
	len = strlen(remote.sun_path) + sizeof(remote.sun_family);
	if (connect(s, (struct sockaddr *)&remote, len) == -1) {
		perror("connect");
		exit(1);
	}

	printf("Connected.\n");

	while(printf("> "), fgets(str, 100, stdin), !feof(stdin)) {
		if (send(s, str, strlen(str), 0) == -1) {
			perror("send");
			exit(1);
		}

		if ((t=recv(s, str, 100, 0)) > 0) {
			str[t] = '\0';
			printf("echo> %s", str);
		} else {
			if (t < 0) perror("recv");
			else printf("Server closed connection\n");
			exit(1);
		}
	}

	close(s);

	return 0;
}