socket通信之http-server

冯卜鹰
2023-12-01
#include <stdarg.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <resolv.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <signal.h>
#include <getopt.h>

//#define DEFAULTIP "127.0.0.1"
#define DEFAULTIP "192.168.1.33"
#define DEFAULTPORT "80"
#define DEFAULTBACK "10"
#define DEFAULTDIR "/home"
#define DEFAULTLOG "/tmp/http-server.log"

void prterrmsg(char *msg);
#define prterrmsg(msg)        { perror(msg); abort(); }
void wrterrmsg(char *msg);
#define wrterrmsg(msg)        { fputs(msg, logfp); fputs(strerror(errno), logfp);fflush(logfp); abort(); }

void prtinfomsg(char *msg);
#define prtinfomsg(msg)        { fputs(msg, stdout);  }
void wrtinfomsg(char *msg);
#define wrtinfomsg(msg)        {  fputs(msg, logfp); fflush(logfp);}

#define MAXBUF        1024

char buffer[MAXBUF + 1];
char *host = 0;
char *port = 0;
char *back = 0;
char *dirroot = 0;
char *logdir = 0;
unsigned char daemon_y_n = 0;
FILE *logfp;

#define MAXPATH        150

char *dir_up(char *dirpath)
{
    static char Path[MAXPATH];
    int len;

    strcpy(Path, dirpath);
    len = strlen(Path);
    if (len > 1 && Path[len - 1] == '/')
        len--;
    while (Path[len - 1] != '/' && len > 1)
        len--;
    Path[len] = 0;
    return Path;
}

void AllocateMemory(char **s, int l, char *d)
{
    *s = malloc(l + 1);
    bzero(*s, l + 1);
    memcpy(*s, d, l);
}



void GiveResponse(FILE * client_sock, char *Path)
{
    struct dirent *dirent;
    struct stat info;
    char Filename[MAXPATH];
    DIR *dir;
    int fd, len, ret;
    char *p, *realPath, *realFilename, *nport;
 
    len = strlen(dirroot) + strlen(Path) + 1;
    realPath = malloc(len + 1);
    bzero(realPath, len + 1);
    sprintf(realPath, "%s/%s", dirroot, Path);
  
    len = strlen(port) + 1;
    nport = malloc(len + 1);
    bzero(nport, len + 1);
   sprintf(nport, ":%s", port);

   
    if (stat(realPath, &info)) {
        fprintf(client_sock,
                "HTTP/1.1 200 OK\r\nServer: DAS by Chengang\r\nConnection: close\r\n\r\n<html><head><title>%d - %s</title></head>"
                "<body><font size=+4>Linux 下目录访问服务器</font><br><hr width=\"100%%\"><br><center>"
                "<table border cols=3 width=\"100%%\">", errno,
                strerror(errno));
        fprintf(client_sock,
                "</table><font color=\"CC0000\" size=+2>请向管理员咨询为何出现如下错误提示：\n%s %s</font></body></html>",
                Path, strerror(errno));
        goto out;
    }
   
    if (S_ISREG(info.st_mode)) {
        fd = open(realPath, O_RDONLY);
        len = lseek(fd, 0, SEEK_END);
        p = (char *) malloc(len + 1);
        bzero(p, len + 1);
        lseek(fd, 0, SEEK_SET);
        ret = read(fd, p, len);
        close(fd);
        fprintf(client_sock,
                "HTTP/1.1 200 OK\r\nServer: DAS by Chengang\r\nConnection: keep-alive\r\nContent-type: application
        dir = opendir(realPath);
        fprintf(client_sock,
                "HTTP/1.1 200 OK\r\nServer: DAS by Chengang\r\nConnection: close\r\n\r\n<html><head><title>%s</title></head>"
                "<body><font size=+4>Linux 下目录访问服务器</font><br><hr width=\"100%%\"><br><center>"
                "<table border cols=3 width=\"100%%\">", Path);
        fprintf(client_sock,
                "<caption><font size=+3>目录 %s</font></caption>\n",
                Path);
        fprintf(client_sock,
                "<tr><td>名称</td><td>大小</td><td>修改时间</td></tr>\n");
        if (dir == 0) {
            fprintf(client_sock,
                    "</table><font color=\"CC0000\" size=+2>%s</font></body></html>",
                    strerror(errno));
            return;
        }
       
        while ((dirent = readdir(dir)) != 0) {
            if (strcmp(Path, "/") == 0)
                sprintf(Filename, "/%s", dirent->d_name);
            else
                sprintf(Filename, "%s/%s", Path, dirent->d_name);
            fprintf(client_sock, "<tr>");
            len = strlen(dirroot) + strlen(Filename) + 1;
            realFilename = malloc(len + 1);
            bzero(realFilename, len + 1);
            sprintf(realFilename, "%s/%s", dirroot, Filename);
            if (stat(realFilename, &info) == 0) {
                if (strcmp(dirent->d_name, "..") == 0)
                    fprintf(client_sock,
                            "<td><a href=\"http://%s%s%s\">(parent)</a></td>",
                            host, atoi(port) == 80 ? "" : nport,
                            dir_up(Path));
                else
                    fprintf(client_sock,
                            "<td><a href=\"http://%s%s%s\">%s</a></td>",
                            host, atoi(port) == 80 ? "" : nport, Filename,
                            dirent->d_name);
               if (S_ISDIR(info.st_mode))
                    fprintf(client_sock, "<td>目录</td>");
                else if (S_ISREG(info.st_mode))
                    fprintf(client_sock, "<td>%d</td>", info.st_size);
                else if (S_ISLNK(info.st_mode))
                    fprintf(client_sock, "<td>链接</td>");
                else if (S_ISCHR(info.st_mode))
                    fprintf(client_sock, "<td>字符设备</td>");
                else if (S_ISBLK(info.st_mode))
                    fprintf(client_sock, "<td>块设备</td>");
                else if (S_ISFIFO(info.st_mode))
                    fprintf(client_sock, "<td>FIFO</td>");
                else if (S_ISSOCK(info.st_mode))
                    fprintf(client_sock, "<td>Socket</td>");
                else
                    fprintf(client_sock, "<td>(未知)</td>");
                fprintf(client_sock, "<td>%s</td>", ctime(&info.st_ctime));
            }
            fprintf(client_sock, "</tr>\n");
            free(realFilename);
        }
        fprintf(client_sock, "</table></center></body></html>");
    } else {
       
        fprintf(client_sock,
                "HTTP/1.1 200 OK\r\nServer: DAS by ZhouLifa\r\nConnection: close\r\n\r\n<html><head><title>permission denied</title></head>"
                "<body><font size=+4>Linux 下目录访问服务器</font><br><hr width=\"100%%\"><br><center>"
                "<table border cols=3 width=\"100%%\">");
        fprintf(client_sock,
                "</table><font color=\"CC0000\" size=+2>你访问的资源'%s'被禁止访问，请联系管理员解决！</font></body></html>",
                Path);
    }
  out:
    free(realPath);
    free(nport);
}

void getoption(int argc, char **argv)
{
    int c, len;
    char *p = 0;

    opterr = 0;
    while (1) {
        int option_index = 0;

  static struct option long_options[] = {
            {"host", 1, 0, 'H'},
            {"port", 1, 0, 'P'},
            {"back", 1, 0, 'B'},
            {"dir", 1, 0, 'D'},
            {"log", 1, 0, 'L'},
            {"daemon", 0, 0, 0},
            {0, 0, 0, 0}
        };
  

    c = getopt_long(argc, argv, "H:P:B:D:L",
                        long_options, &option_index);
        if (c == -1 || c == '?')
            break;

        if(optarg)        len = strlen(optarg);
        else        len = 0;

        if ((!c && !(strcasecmp(long_options[option_index].name, "host")))
            || c == 'H')
            p = host = malloc(len + 1);
        else if ((!c
                  &&
                  !(strcasecmp(long_options[option_index].name, "port")))
                 || c == 'P')
            p = port = malloc(len + 1);
        else if ((!c
                  &&
                  !(strcasecmp(long_options[option_index].name, "back")))
                 || c == 'B')
            p = back = malloc(len + 1);
        else if ((!c
                  && !(strcasecmp(long_options[option_index].name, "dir")))
                 || c == 'D')
            p = dirroot = malloc(len + 1);
        else if ((!c
                  && !(strcasecmp(long_options[option_index].name, "log")))
                 || c == 'L')
            p = logdir = malloc(len + 1);
        else if ((!c
                  &&
                  !(strcasecmp
                    (long_options[option_index].name, "daemon")))) {
            daemon_y_n = 1;
            continue;
        }
        else
            break;
        bzero(p, len + 1);
        memcpy(p, optarg, len);
    }
}

int main(int argc, char **argv)
{
    struct sockaddr_in addr;
    int sock_fd, addrlen;
 
    getoption(argc, argv);

    if (!host) {
        addrlen = strlen(DEFAULTIP);
        AllocateMemory(&host, addrlen, DEFAULTIP);
    }
    if (!port) {
        addrlen = strlen(DEFAULTPORT);
        AllocateMemory(&port, addrlen, DEFAULTPORT);
    }
    if (!back) {
        addrlen = strlen(DEFAULTBACK);
        AllocateMemory(&back, addrlen, DEFAULTBACK);
    }
    if (!dirroot) {
        addrlen = strlen(DEFAULTDIR);
        AllocateMemory(&dirroot, addrlen, DEFAULTDIR);
    }
    if (!logdir) {
        addrlen = strlen(DEFAULTLOG);
        AllocateMemory(&logdir, addrlen, DEFAULTLOG);
    }

    printf
        ("host=%s port=%s back=%s dirroot=%s logdir=%s %s  backgroud mode(process ID:%d)\n",
         host, port, back, dirroot, logdir, daemon_y_n?"":"not", getpid());
  

    if (daemon_y_n) {
        if (fork())
            exit(0);
        if (fork())
            exit(0);
        close(0), close(1), close(2);
        logfp = fopen(logdir, "a+");
        if (!logfp)
            exit(0);
    }
  
    signal(SIGCHLD, SIG_IGN);
 
    if ((sock_fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
        if (!daemon_y_n) {
            prterrmsg("socket()");
        } else {
            wrterrmsg("socket()");
        }
    }
 
    addrlen = 1;
    setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &addrlen,
               sizeof(addrlen));

    addr.sin_family = AF_INET;
    addr.sin_port = htons(atoi(port));
    addr.sin_addr.s_addr = inet_addr(host);
    addrlen = sizeof(struct sockaddr_in);
 
    if (bind(sock_fd, (struct sockaddr *) &addr, addrlen) < 0) {
        if (!daemon_y_n) {
            prterrmsg("bind()");
        } else {
            wrterrmsg("bind()");
        }
    }
 
    if (listen(sock_fd, atoi(back)) < 0) {
        if (!daemon_y_n) {
            prterrmsg("listen()");
        } else {
            wrterrmsg("listen()");
        }
    }
    while (1) {
        int len;
        int new_fd;
        addrlen = sizeof(struct sockaddr_in);
  
        new_fd = accept(sock_fd, (struct sockaddr *) &addr, &addrlen);
        if (new_fd < 0) {
            if (!daemon_y_n) {
                prterrmsg("accept()");
            } else {
                wrterrmsg("accept()");
            }
            break;
        }
        bzero(buffer, MAXBUF + 1);
        sprintf(buffer, "Connection comes from:\n %s:%d\n",
                inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
        if (!daemon_y_n) {
            prtinfomsg(buffer);
        } else {
            wrtinfomsg(buffer);
        }
  
        if (!fork()) {
            bzero(buffer, MAXBUF + 1);
            if ((len = recv(new_fd, buffer, MAXBUF, 0)) > 0) {
                FILE *ClientFP = fdopen(new_fd, "w");
                if (ClientFP == NULL) {
                    if (!daemon_y_n) {
                        prterrmsg("fdopen()");
                    } else {
                        prterrmsg("fdopen()");
                    }
                } else {
                    char Req[MAXPATH + 1] = "";
                    sscanf(buffer, "GET %s HTTP", Req);  //取buffer内容到Req中（以字符串的形式）
                    bzero(buffer, MAXBUF + 1);
                    sprintf(buffer, "Request acquire files: \"%s\"\n", Req);//以字符串的形式将Req的内容传到buffer中
                    if (!daemon_y_n) {
                        prtinfomsg(buffer);
                    } else {
                        wrtinfomsg(buffer);
                    }
                
                    GiveResponse(ClientFP, Req);
                    fclose(ClientFP);
                }
            }
            exit(0);
        }
        close(new_fd);
    }
    close(sock_fd);
    return 0;
}
socket通信之http-server

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