Linux C言語 簡易HTTPサーバープログラム例

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>/* struct hostent,gethostbynameのため */
#include <fcntl.h>
#include <sys/stat.h>
#define Err(x) {fprintf(stderr,"error ");perror(x);exit(0);}
#define print_ip(a) {printf("%d.%d.%d.%d\n",(0x0ff&(a>>24)),(0x0ff&(a>>16)),(0x0ff&(a>>8)),(0x0ff&a));}
int server_fd;/* ソケット識別子 */
char hostname[256];
struct hostent *phost;
struct in_addr **addrptr;/* IPアドレス配列のポインタ管理用 */
struct sockaddr_in server_adr;
int client_fd;
struct sockaddr_in client_adr;

struct stat sbuf;

main(){
        int yes=1;

        /* ソケットの生成 */
        server_fd=socket(AF_INET, SOCK_STREAM, 0);
        if(server_fd < 0) Err("socket");

        /* サーバホスト名取得 */
        printf("socket handle:%u\n",server_fd);
        if(gethostname(hostname,sizeof(hostname)) < 0) Err("gethostname");
        printf("host name:%s\n", hostname);

        /* ホスト名からID取得 */
        phost = gethostbyname(hostname);
        if(phost == NULL)Err("gethostbyname");
        int n = 0;
        while(phost->h_addr_list[n] != NULL){
                addrptr=(struct in_addr **)phost->h_addr_list;
                printf("%s\n", inet_ntoa(*addrptr[n]));
                n++;
        }
/*      setsockopt(server_fd,
   SOL_SOCKET, SO_REUSEADDR, (const char *)&yes, sizeof(yes));
*/

        /* ソケットへの割り当て */
        memset((char *) &server_adr, sizeof(server_adr),0);
        server_adr.sin_family = AF_INET;
        server_adr.sin_port = htons(8888);
        server_adr.sin_addr = *addrptr[0];
        server_adr.sin_addr.s_addr = inet_addr("192.168.253.3");
        if(bind(server_fd, (struct sockaddr *)&server_adr, sizeof(server_adr)) < 0) Err("bind");

        if(listen(server_fd, 5) == -1) Err("listen");

        while(1){
                int status;
                int len = sizeof(client_adr);
                client_fd = accept(server_fd,(struct sockaddr*)&client_adr, &len);
                if(client_fd < 0) Err("accept");
                if(fork()==0) client_proc();
                close(client_fd);
                wait(&status);
        }
}

int client_proc(){
        char buf[12048];
        char path[256]=".";
        int pathlen;
        int numb = 0;
        int len = 0;
        int bin_flag = 1;
        int n;
        while(len < sizeof(buf)){
                n = recv(client_fd, buf+len, 1, 0);
                if(n < 0) break;
                //printf("%d", len);
                //putchar(buf[len]);
                if(buf[len++]!=0x0a){
                        continue;
                }
                buf[len]='\0';
                fputs(buf,stdout);
                if(buf[1]==0x0a && len==2) break;
                len=0;
                numb++;
                if(numb == 1){
                        char *s = strchr(buf, '/');
                        if(s != NULL) strcpy(path+1,s);
                        s = strchr(path, ' ');
                        if(s != NULL) *s = '\0';
                }
        }
        pathlen=strlen(path);
        if(pathlen>5){
                if(strcmp(path+pathlen-5,".html") == 0) bin_flag=0;
                if(strcmp(path+pathlen-4,".htm") == 0) bin_flag=0;
                if(strcmp(path+pathlen-4,".txt") == 0) bin_flag=0;

        }
        if(strcmp(path,"./")==0 || stat(path,&sbuf) < 0){
                sprintf(buf,"HTTP/1.0 404 Not Found\r\n\r\n");
                printf("%s",buf);
                if(send(client_fd,buf,strlen(buf),0) < 0) Err("not found send");
        } else {
                FILE *fp=fopen(path,"r");
                int c;
                if(fp==NULL)Err("fopen");
                printf("file path===%d=====%s===%dbyte\n",bin_flag,path, sbuf.st_size);
                len = sprintf(buf,"HTTP/1.0 200 OK\r\n");
                len += sprintf(buf+len,"Server: suzuki test/1.0\r\n");
                len += sprintf(buf+len,"Accept-Ranges: bytes\r\n");
                len += sprintf(buf+len,"Content-Length: %d\r\n",sbuf.st_size);
                if(bin_flag==1){
                        len += sprintf(buf+len,"Content-Type: application/octet-stream\r\n");
                } else {
                        len += sprintf(buf+len,"Content-Type: text/html\r\n");
                }
                len += sprintf(buf+len,"\r\n");
                printf("%s",buf);
                if(send(client_fd,buf,len,0) < 0) Err("not found send");
                len=0;
                while((c=fgetc(fp)) != EOF){
                        buf[len++]=c;
                }
                printf("%dbyte\n",len);
                fclose(fp);
                if(send(client_fd,buf,len,0) < 0) Err("send html");
        }

        if( shutdown(client_fd, 2) < 0) Err("shutdown");
        close(client_fd);
        exit(0);
}