init

.gitignore

@@ -50,3 +50,5 @@ modules.order
 Module.symvers
 Mkfile.old
 dkms.conf
+
+build

CMakeLists.txt

@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 2.6)
+project(simple-http-server C)
+SET(CMAKE_BUILD_TYPE "Release")
+
+add_definitions(-DLISTEN_ON_IPV6)
+IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
+    add_definitions("-DCPUBIT64")
+ELSE()
+    add_definitions("-DCPUBIT32")
+ENDIF()
+
+include_directories("/usr/local/include")
+link_directories("/usr/local/lib")
+
+add_executable(simple-http-server server.c)
+target_link_libraries(simple-http-server pthread)
+
+INSTALL(TARGETS simple-http-server RUNTIME DESTINATION bin)

README.md

@@ -1,2 +1,35 @@
 # simple-http-server
 A variant of Tinyhttpd.
+
+Created November 1999 by J. David Blackstone.
+
+Modified June 2021 by Fumiama(源文雨)
+
+# Features
+
+1. Serve files
+2. CGI
+3. Listen on `ipv6`
+4. Multi-thread
+
+# Compile
+
+```bash
+git clone https://github.com/fumiama/simple-http-server.git
+cd simple-http-server
+mkdir build
+cd build
+cmake ..
+make
+make install
+```
+
+# Command line usage
+
+```bash
+simple-http-server -d port chdir
+```
+
+- **-d** - run as daemon
+- **port** - bind server on this port (0 for a random one)
+- **chdir** - change root dir to here

server.c

@@ -0,0 +1,540 @@
+/* J. David's webserver */
+/* This is a simple webserver.
+ * Created November 1999 by J. David Blackstone.
+ * CSE 4344 (Network concepts), Prof. Zeigler
+ * University of Texas at Arlington
+ *
+ * Modified June 2021 by Fumiama(源文雨)
+ */
+#include <stdio.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <strings.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+#define ISspace(x) isspace((int)(x))
+
+#define SERVER_STRING "Server: tinyhttpd edited by fumiama/0.1.0\r\n"
+
+void accept_request(void *);
+void bad_request(int);
+void cat(int, FILE *);
+void cannot_execute(int);
+void error_die(const char *);
+void execute_cgi(int, const char *, const char *, const char *);
+off_t get_file_size(const char *);
+int get_line(int, char *, int);
+void headers(int, const char *);
+void not_found(int);
+void serve_file(int, const char *);
+int startup(u_short *);
+void unimplemented(int);
+
+/**********************************************************************/
+/* A request has caused a call to accept() on the server port to
+ * return.  Process the request appropriately.
+ * Parameters: the socket connected to the client */
+/**********************************************************************/
+void accept_request(void *cli) {
+    pthread_detach(pthread_self());
+    int client = (int)cli;
+    char buf[1024];
+    int numchars;
+    char method[255];
+    char url[255];
+    char path[512];
+    size_t i, j;
+    struct stat st;
+    int cgi = 0; /* becomes true if server decides this is a CGI
+                    * program */
+    char *query_string = NULL;
+
+    numchars = get_line(client, buf, sizeof(buf));
+    i = 0;
+    j = 0;
+    while (!ISspace(buf[j]) && (i < sizeof(method) - 1)) {
+        method[i] = buf[j];
+        i++;
+        j++;
+    }
+    method[i] = '\0';
+
+    if (strcasecmp(method, "GET") && strcasecmp(method, "POST")) {
+        unimplemented(client);
+        return;
+    }
+
+    if (strcasecmp(method, "POST") == 0)
+        cgi = 1;
+
+    i = 0;
+    while (ISspace(buf[j]) && (j < sizeof(buf)))
+        j++;
+    while (!ISspace(buf[j]) && (i < sizeof(url) - 1) && (j < sizeof(buf))) {
+        url[i] = buf[j];
+        i++;
+        j++;
+    }
+    url[i] = '\0';
+
+    if (strcasecmp(method, "GET") == 0) {
+        query_string = url;
+        while ((*query_string != '?') && (*query_string != '\0')) query_string++;
+        if (*query_string == '?') {
+            cgi = 1;
+            *query_string = '\0';
+            query_string++;
+        }
+    }
+
+    //getcwd(path, sizeof(path));
+    //strcat(path, url);
+    sprintf(path, ".%s", url[1] == '#' ? url + 2 : url);
+    if (path[strlen(path) - 1] == '/')
+        strcat(path, "index.html");
+    if (stat(path, &st) == -1) {
+        while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */
+            numchars = get_line(client, buf, sizeof(buf));
+        not_found(client);
+    }
+    else
+    {
+        if ((st.st_mode & S_IFMT) == S_IFDIR) {
+            //getcwd(path, sizeof(path));
+            strcat(path, "/index.html");
+        }
+        if ((st.st_mode & S_IXUSR) ||
+            (st.st_mode & S_IXGRP) ||
+            (st.st_mode & S_IXOTH))
+            cgi = 1;
+        if (!cgi)
+            serve_file(client, path);
+        else
+            execute_cgi(client, path, method, query_string);
+    }
+
+    close(client);
+}
+
+/**********************************************************************/
+/* Inform the client that a request it has made has a problem.
+ * Parameters: client socket */
+/**********************************************************************/
+void bad_request(int client) {
+    char buf[1024];
+
+    sprintf(buf, "HTTP/1.0 400 BAD REQUEST\r\n");
+    send(client, buf, sizeof(buf), 0);
+    sprintf(buf, "Content-Type: text/html\r\n");
+    send(client, buf, sizeof(buf), 0);
+    sprintf(buf, "\r\n");
+    send(client, buf, sizeof(buf), 0);
+    sprintf(buf, "<P>Your browser sent a bad request, ");
+    send(client, buf, sizeof(buf), 0);
+    sprintf(buf, "such as a POST without a Content-Length.\r\n");
+    send(client, buf, sizeof(buf), 0);
+}
+
+/**********************************************************************/
+/* Put the entire contents of a file out on a socket.  This function
+ * is named after the UNIX "cat" command, because it might have been
+ * easier just to do something like pipe, fork, and exec("cat").
+ * Parameters: the client socket descriptor
+ *             FILE pointer for the file to cat */
+/**********************************************************************/
+void cat(int client, FILE *resource) {
+    char buf[1024];
+    size_t size = 0;
+
+    while ((size = fread(buf, sizeof(char), 1024, resource)))
+        send(client, buf, size, 0);
+}
+
+/**********************************************************************/
+/* Inform the client that a CGI script could not be executed.
+ * Parameter: the client socket descriptor. */
+/**********************************************************************/
+void cannot_execute(int client) {
+    char buf[1024];
+
+    sprintf(buf, "HTTP/1.0 500 Internal Server Error\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "Content-Type: text/html\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "<P>Error prohibited CGI execution.\r\n");
+    send(client, buf, strlen(buf), 0);
+}
+
+/**********************************************************************/
+/* Print out an error message with perror() (for system errors; based
+ * on value of errno, which indicates system call errors) and exit the
+ * program indicating an error. */
+/**********************************************************************/
+void error_die(const char *sc) {
+    perror(sc);
+    exit(1);
+}
+
+/**********************************************************************/
+/* Execute a CGI script.  Will need to set environment variables as
+ * appropriate.
+ * Parameters: client socket descriptor
+ *             path to the CGI script */
+/**********************************************************************/
+void execute_cgi(int client, const char *path, const char *method, const char *query_string) {
+    char buf[1024];
+    int cgi_output[2];
+    int cgi_input[2];
+    pid_t pid;
+    int status;
+    int i;
+    char c;
+    int numchars = 1;
+    int content_length = -1;
+
+    buf[0] = 'A';
+    buf[1] = '\0';
+    if (strcasecmp(method, "GET") == 0)
+        while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */
+            numchars = get_line(client, buf, sizeof(buf));
+    else /* POST */
+    {
+        numchars = get_line(client, buf, sizeof(buf));
+        while ((numchars > 0) && strcmp("\n", buf)) {
+            buf[15] = '\0';
+            if (strcasecmp(buf, "Content-Length:") == 0)
+                content_length = atoi(&(buf[16]));
+            numchars = get_line(client, buf, sizeof(buf));
+        }
+        if (content_length == -1) {
+            bad_request(client);
+            return;
+        }
+    }
+
+    sprintf(buf, "HTTP/1.0 200 OK\r\n");
+    send(client, buf, strlen(buf), 0);
+
+    if (pipe(cgi_output) < 0) {
+        cannot_execute(client);
+        return;
+    }
+    if (pipe(cgi_input) < 0) {
+        cannot_execute(client);
+        return;
+    }
+
+    if ((pid = fork()) < 0) {
+        cannot_execute(client);
+        return;
+    }
+    /* child: CGI script */
+    if (pid == 0) {
+        char meth_env[255];
+        char query_env[255];
+        char length_env[255];
+
+        dup2(cgi_output[1], 1);
+        dup2(cgi_input[0], 0);
+        close(cgi_output[0]);
+        close(cgi_input[1]);
+        sprintf(meth_env, "REQUEST_METHOD=%s", method);
+        putenv(meth_env);
+        if (strcasecmp(method, "GET") == 0) {
+            sprintf(query_env, "QUERY_STRING=%s", query_string);
+            putenv(query_env);
+        }
+        else
+        { /* POST */
+            sprintf(length_env, "CONTENT_LENGTH=%d", content_length);
+            putenv(length_env);
+        }
+        //if(strcmp(path, "./sockjs-node/info") == 0) execl("cat", "./sockjs-node/info.json", 0);
+        execl(path, path, NULL);
+        exit(0);
+    }
+    else { /* parent */
+        close(cgi_output[1]);
+        close(cgi_input[0]);
+        if (strcasecmp(method, "POST") == 0)
+            for (i = 0; i < content_length; i++) {
+                recv(client, &c, 1, 0);
+                write(cgi_input[1], &c, 1);
+            }
+        while (read(cgi_output[0], &c, 1) > 0)
+            send(client, &c, 1, 0);
+
+        close(cgi_output[0]);
+        close(cgi_input[1]);
+        waitpid(pid, &status, 0);
+    }
+}
+
+/**********************************************************************/
+/* Returns the size of a file. */
+/* Parameters: path of the file */
+/**********************************************************************/
+off_t get_file_size(const char *filepath) {
+    struct stat statbuf;
+    if (stat(filepath, &statbuf) == 0)
+        return statbuf.st_size;
+    else
+        return -1;
+}
+
+/**********************************************************************/
+/* Get a line from a socket, whether the line ends in a newline,
+ * carriage return, or a CRLF combination.  Terminates the string read
+ * with a null character.  If no newline indicator is found before the
+ * end of the buffer, the string is terminated with a null.  If any of
+ * the above three line terminators is read, the last character of the
+ * string will be a linefeed and the string will be terminated with a
+ * null character.
+ * Parameters: the socket descriptor
+ *             the buffer to save the data in
+ *             the size of the buffer
+ * Returns: the number of bytes stored (excluding null) */
+/**********************************************************************/
+int get_line(int sock, char *buf, int size) {
+    int i = 0;
+    char c = '\0';
+    int n;
+
+    while ((i < size - 1) && (c != '\n')) {
+        n = recv(sock, &c, 1, 0);
+        /* DEBUG printf("%02X\n", c); */
+        if (n > 0) {
+            if (c == '\r') {
+                n = recv(sock, &c, 1, MSG_PEEK);
+                /* DEBUG printf("%02X\n", c); */
+                if ((n > 0) && (c == '\n'))
+                    recv(sock, &c, 1, 0);
+                else
+                    c = '\n';
+            }
+            buf[i] = c;
+            i++;
+        }
+        else
+            c = '\n';
+    }
+    buf[i] = '\0';
+
+    return (i);
+}
+
+/**********************************************************************/
+/* Return the informational HTTP headers about a file. */
+/* Parameters: the socket to print the headers on
+ *             the name of the file */
+/**********************************************************************/
+#define ADD_HERDER(h)\
+    strcpy(buf + offset, h);\
+    offset += sizeof(h) - 1;
+#define ADD_HERDER_PARAM(h, p)\
+    sprintf(buf + offset, h, (p));\
+    offset += strlen(buf + offset);
+#define EXTNM_IS_NOT(name) (strcmp(filepath+extpos, name))
+
+#define HTTP200 "HTTP/1.0 200 OK\r\n"
+#define CONTENT_TYPE "Content-Type: %s\r\n"
+#define CONTENT_LEN "Content-Length: %d\r\n"
+void headers(int client, const char *filepath) {
+    char buf[1024];
+    uint offset = 0;
+    uint extpos = strlen(filepath) - 4;
+
+    ADD_HERDER(HTTP200);
+    ADD_HERDER(SERVER_STRING);
+    ADD_HERDER_PARAM(CONTENT_TYPE, EXTNM_IS_NOT("html")?(EXTNM_IS_NOT(".css")?"text/plain":"text/css"):"text/html");
+    ADD_HERDER_PARAM(CONTENT_LEN, get_file_size(filepath));
+    ADD_HERDER("\r\n");
+    send(client, buf, offset, 0);
+}
+
+/**********************************************************************/
+/* Give a client a 404 not found status message. */
+/**********************************************************************/
+void not_found(int client) {
+    char buf[1024];
+
+    sprintf(buf, "HTTP/1.0 404 NOT FOUND\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, SERVER_STRING);
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "Content-Type: text/html\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "<HTML><TITLE>Not Found</TITLE>\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "<BODY><P>The server could not fulfill\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "your request because the resource specified\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "is unavailable or nonexistent.\r\n");
+    send(client, buf, strlen(buf), 0);
+    //FILE *fp = popen("ps -Z", "r");
+    //fread(buf, sizeof(buf), 1, fp);
+    //fclose(fp);
+    //send(client, buf, strlen(buf), 0);
+    sprintf(buf, "</BODY></HTML>\r\n");
+    send(client, buf, strlen(buf), 0);
+}
+
+/**********************************************************************/
+/* Send a regular file to the client.  Use headers, and report
+ * errors to client if they occur.
+ * Parameters: a pointer to a file structure produced from the socket
+ *              file descriptor
+ *             the name of the file to serve */
+/**********************************************************************/
+void serve_file(int client, const char *filename) {
+    FILE *resource = NULL;
+    int numchars = 1;
+    char buf[1024];
+
+    buf[0] = 'A';
+    buf[1] = '\0';
+    while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */
+        numchars = get_line(client, buf, sizeof(buf));
+
+    resource = fopen(filename, "rb");
+    if (resource == NULL)
+        not_found(client);
+    else
+    {
+        headers(client, filename);
+        cat(client, resource);
+    }
+    fclose(resource);
+}
+
+/**********************************************************************/
+/* This function starts the process of listening for web connections
+ * on a specified port.  If the port is 0, then dynamically allocate a
+ * port and modify the original port variable to reflect the actual
+ * port.
+ * Parameters: pointer to variable containing the port to connect on
+ * Returns: the socket */
+/**********************************************************************/
+#ifdef LISTEN_ON_IPV6
+static socklen_t struct_len = sizeof(struct sockaddr_in6);
+static struct sockaddr_in6 name;
+#else
+static socklen_t struct_len = sizeof(struct sockaddr_in);
+static struct sockaddr_in name;
+#endif
+
+int startup(u_short *port) {
+    int httpd = 0;
+
+#ifdef LISTEN_ON_IPV6
+    name.sin6_family = AF_INET6;
+    name.sin6_port = htons(*port);
+    bzero(&(name.sin6_addr), sizeof(name.sin6_addr));
+    httpd = socket(PF_INET6, SOCK_STREAM, 0);
+#else
+    name.sin_family = AF_INET;
+    name.sin_port = htons(*port);
+    name.sin_addr.s_addr = INADDR_ANY;
+    bzero(&(name.sin_zero), 8);
+    httpd = socket(AF_INET, SOCK_STREAM, 0);
+#endif
+    if (httpd == -1)
+        error_die("socket");
+    if (bind(httpd, (struct sockaddr *)&name, struct_len) < 0)
+        error_die("bind");
+    /* if dynamically allocating a port */
+    if (*port == 0) {
+        if (getsockname(httpd, (struct sockaddr *)&name, &struct_len) == -1)
+            error_die("getsockname");
+#ifdef LISTEN_ON_IPV6
+        *port = ntohs(name.sin6_port);
+#else
+        *port = ntohs(name.sin_port);
+#endif
+    }
+    if (listen(httpd, 5) < 0)
+        error_die("listen");
+    return (httpd);
+}
+
+/**********************************************************************/
+/* Inform the client that the requested web method has not been
+ * implemented.
+ * Parameter: the client socket */
+/**********************************************************************/
+void unimplemented(int client) {
+    char buf[1024];
+
+    sprintf(buf, "HTTP/1.0 501 Method Not Implemented\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, SERVER_STRING);
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "Content-Type: text/html\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "<HTML><HEAD><TITLE>Method Not Implemented\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "</TITLE></HEAD>\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "<BODY><P>HTTP request method not supported.\r\n");
+    send(client, buf, strlen(buf), 0);
+    sprintf(buf, "</BODY></HTML>\r\n");
+    send(client, buf, strlen(buf), 0);
+}
+
+/**********************************************************************/
+/* simple-http-server
+ * Usage: simple-http-server -d port chdir
+/**********************************************************************/
+#define ACCEPT_CLI() {\
+    while (1) {\
+        client_sock = accept(server_sock, (struct sockaddr *)&client_name, &client_name_len);\
+        if (client_sock == -1) break;\
+        if (pthread_create(&newthread, NULL, accept_request, client_sock) != 0) perror("pthread_create");\
+    }\
+    close(client_sock);\
+    error_die("accept");\
+}
+
+int main(int argc, char **argv) {
+    if(argc != 3 && argc != 4) puts("Usage: simple-http-server -d port chdir");
+    else {
+        int as_daemon = *(uint16_t*)argv[1] == *(uint16_t*)"-d";
+        int server_sock = -1;
+        u_short port = (u_short)atoi(argv[as_daemon?2:1]);
+        int client_sock = -1;
+        int pid = -1;
+        struct sockaddr_in client_name;
+        socklen_t client_name_len = sizeof(client_name);
+        pthread_t newthread;
+
+        char *cdir = argv[as_daemon?3:2];
+        if(chdir(cdir)) error_die("chdir");
+        server_sock = startup(&port);
+        printf("httpd running on port %d\n", port);
+        if(as_daemon) {
+            pid = fork();
+            while (pid > 0) {      //主进程监控子进程状态，如果子进程异常终止则重启之
+                wait(NULL);
+                puts("Server subprocess exited. Restart...");
+                pid = fork();
+            }
+            if(pid < 0) perror("fork");
+            else ACCEPT_CLI();
+        } else ACCEPT_CLI();
+    }
+}