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修正cgi，优化代码结构

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源文雨
2021-08-07 17:46:08 +08:00
parent 1b7e8a5119
commit fe8277a3bf
2 changed files with 324 additions and 349 deletions
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1
README.md
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@@ -20,7 +20,6 @@ A necessary subset of `HTTP 1.0` with following options of request header being
- 200 OK - 200 OK
- 400 BAD REQUEST - 400 BAD REQUEST
- 404 NOT FOUND - 404 NOT FOUND
- 414 Request-URI Too Long
- 500 Internal Server Error - 500 Internal Server Error
- 501 Method Not Implemented - 501 Method Not Implemented

672
server.c
View File

@@ -25,9 +25,9 @@
#include <unistd.h> #include <unistd.h>
#if !__APPLE__ #if !__APPLE__
#include <sys/sendfile.h> #include <sys/sendfile.h>
#else #else
static struct sf_hdtr hdtr; static struct sf_hdtr hdtr;
#endif #endif
#define ISspace(x) isspace((int)(x)) #define ISspace(x) isspace((int)(x))
@@ -38,10 +38,10 @@ enum METHOD_TYPE {GET, POST};
typedef enum METHOD_TYPE METHOD_TYPE; typedef enum METHOD_TYPE METHOD_TYPE;
struct HTTP_REQUEST { struct HTTP_REQUEST {
const char *path; const char *path;
const char *method; const char *method;
METHOD_TYPE method_type; METHOD_TYPE method_type;
const char *query_string; const char *query_string;
}; };
typedef struct HTTP_REQUEST HTTP_REQUEST; typedef struct HTTP_REQUEST HTTP_REQUEST;
@@ -54,11 +54,10 @@ static void execute_cgi(int, int, const HTTP_REQUEST*);
static uint32_t get_file_size(const char *, int); static uint32_t get_file_size(const char *, int);
static int get_line(int, char *, int); static int get_line(int, char *, int);
static void handle_quit(int); static void handle_quit(int);
static void headers(int, const char *); static int headers(int, const char *);
static void not_found(int); static void not_found(int);
static void serve_file(int, const char *); static void serve_file(int, const char *);
static int startup(u_int16_t *); static int startup(u_int16_t *);
static void toolong(int);
static void unimplemented(int); static void unimplemented(int);
/**********************************************************************/ /**********************************************************************/
@@ -69,110 +68,101 @@ static void unimplemented(int);
/* read & discard headers */ /* read & discard headers */
#define discard(client) \ #define discard(client) \
while((numchars > 0) && strcmp("\n", buf)) numchars = get_line(client, buf, sizeof(buf)) while((numchars > 0) && strcmp("\n", buf)) numchars = get_line(client, buf, sizeof(buf))
#define methodequ(str, method) (*(uint32_t*)(method) == *(uint32_t*)(str))
#define skiptext(buf, j, cap) while(!ISspace(buf[j]) && (j < (cap))) j++
#define skipspace(buf, j, cap) while(ISspace(buf[j]) && (j < (cap))) j++
#define getmethod(method_type) ((method_type == GET)?"GET":"POST")
static void accept_request(void *cli) { static void accept_request(void *cli) {
pthread_detach(pthread_self()); int client = (int)cli;
int client =(int)cli; char buf[1024], *path, *query_string;
char buf[1024]; int numchars, cgi = 0, j; // cgi becomes true if server decides this is a CGI program
int numchars; struct stat st;
char method[255]; METHOD_TYPE method_type;
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;
METHOD_TYPE method_type;
numchars = get_line(client, buf, sizeof(buf)); pthread_detach(pthread_self());
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") == 0) { numchars = get_line(client, buf, sizeof(buf));
method_type = GET; j = 0;
} skiptext(buf, j, numchars - 1);
buf[j] = '\0';
if(strcasecmp(method, "POST") == 0) { if(methodequ(buf, "GET")) method_type = GET;
if(method_type == GET) { else if(methodequ(buf, "POST")) {
discard(client); cgi = 1;
unimplemented(client); method_type = POST;
return; }
} else {
cgi = 1;
method_type = POST;
}
}
i = 0; skipspace(buf, j, numchars - 1);
while(ISspace(buf[j]) && (j < sizeof(buf))) j++; path = buf + j + 1;
for(; !ISspace(buf[j]) && (i < sizeof(url) - 1) && (j < sizeof(buf)); i++, j++) { skiptext(buf, j, numchars - 1);
url[i] = buf[j]; buf[j] = 0;
}
if(!ISspace(buf[j])) { if(method_type == GET) {
query_string = path;
while((*query_string != '?') && (*query_string != '\0')) query_string++;
if(*query_string == '?') {
cgi = 1;
*query_string = '\0';
query_string++;
}
}
// skip possible ../
while((*path == '.' || *path == '/' || *path == '#') && *path != 0) path++;
path -= 2;
path[0] = '.'; path[1] = '/';
printf("[%s] <%s> (%s) = ", getmethod(method_type), path, query_string);
// 花括号不可省略
if(stat(path, &st) == -1) {
discard(client); discard(client);
toolong(client); not_found(client);
return; } else {
} int pathlen = strlen(path) + 1;
url[i] = '\0'; char* path_heap = malloc(pathlen + 11); // 11 is for possible /index.html
memcpy(path_heap, path, pathlen);
printf("<%d> ", pathlen);
path = path_heap;
if(method_type == GET) { char* query_heap = query_string;
query_string = url; int query_length = strlen(query_heap) + 1;
while((*query_string != '?') &&(*query_string != '\0')) query_string++; query_string = malloc(query_length);
if(*query_string == '?') { memcpy(query_string, query_heap, query_length);
cgi = 1; printf("(%d) ", query_length);
*query_string = '\0';
query_string++;
}
}
char* url_start = url + 1; if((st.st_mode & S_IFMT) == S_IFDIR) {
//skip possible ../ strcat(path, "/index.html");
while((*url_start == '.' || *url_start == '/' || *url_start == '#') && *url_start != 0) url_start++; // 花括号不可省略
path[0] = '.'; path[1] = '/'; path[2] = 0; if(stat(path, &st) == -1) {
if(*url_start) strncat(path, url_start, 499); discard(client);
printf("%s %s with query '%s': ", method, path, query_string); not_found(client);
//花括号不可省略 close(client);
if(stat(path, &st) == -1) { return;
discard(client); }
not_found(client); }
} else { int content_length = 0;
if((st.st_mode & S_IFMT) == S_IFDIR) { cgi &= ((st.st_mode & S_IXUSR) || (st.st_mode & S_IXGRP) || (st.st_mode & S_IXOTH));
strcat(path, "/index.html"); while((numchars > 0) && strcmp("\n", buf)) {
//花括号不可省略 numchars = get_line(client, buf, sizeof(buf));
if(stat(path, &st) == -1) { if(!content_length && strcasestr(buf, "Content-Length: ")) {
discard(client); content_length = atoi(buf + 16);
not_found(client); }
close(client); }
return; if(method_type == POST && content_length == -1) bad_request(client);
} else if(!cgi) serve_file(client, path);
} else {
int content_length = 0; HTTP_REQUEST request;
if((st.st_mode & S_IXUSR) ||(st.st_mode & S_IXGRP) ||(st.st_mode & S_IXOTH)) cgi = 1; request.path = path;
while((numchars > 0) && strcmp("\n", buf)) { request.method = getmethod(method_type);
numchars = get_line(client, buf, sizeof(buf)); request.method_type = method_type;
if(!content_length && strcasestr(buf, "Content-Length: ")) { request.query_string = query_string;
content_length = atoi(buf + 16); execute_cgi(client, content_length, &request);
} }
} free(path); free(query_string);
if(method_type == POST && content_length == -1) bad_request(client); }
else if(!cgi) serve_file(client, path); close(client);
else {
HTTP_REQUEST request;
request.path = path;
request.method = method;
request.method_type = method_type;
request.query_string = query_string;
execute_cgi(client, content_length, &request);
}
}
close(client);
} }
/**********************************************************************/ /**********************************************************************/
@@ -181,7 +171,8 @@ static void accept_request(void *cli) {
/**********************************************************************/ /**********************************************************************/
#define HTTP400 "HTTP/1.0 400 BAD REQUEST\r\nContent-Type: text/html\r\n\r\n<P>Your browser sent a bad request, such as a POST without a Content-Length.\r\n" #define HTTP400 "HTTP/1.0 400 BAD REQUEST\r\nContent-Type: text/html\r\n\r\n<P>Your browser sent a bad request, such as a POST without a Content-Length.\r\n"
static void bad_request(int client) { static void bad_request(int client) {
send(client, HTTP400, sizeof(HTTP400)-1, 0); send(client, HTTP400, sizeof(HTTP400)-1, 0);
puts("400 BAD REQUEST.");
} }
/**********************************************************************/ /**********************************************************************/
@@ -192,16 +183,16 @@ static void bad_request(int client) {
* FILE pointer for the file to cat */ * FILE pointer for the file to cat */
/**********************************************************************/ /**********************************************************************/
static void cat(int client, FILE *resource) { static void cat(int client, FILE *resource) {
off_t len = 0; off_t len = 0;
#if __APPLE__ #if __APPLE__
sendfile(fileno(resource), client, 0, &len, &hdtr, 0); sendfile(fileno(resource), client, 0, &len, &hdtr, 0);
#else #else
fseek(resource, 0, SEEK_END); fseek(resource, 0, SEEK_END);
off_t file_size = ftell(resource); off_t file_size = ftell(resource);
rewind(resource); rewind(resource);
sendfile(client, fileno(resource), &len, file_size); sendfile(client, fileno(resource), &len, file_size);
#endif #endif
printf("Send %lu bytes.\n", len); printf("Sendfile: %lu bytes.\n", len);
} }
/**********************************************************************/ /**********************************************************************/
@@ -210,7 +201,8 @@ static void cat(int client, FILE *resource) {
/**********************************************************************/ /**********************************************************************/
#define HTTP500 "HTTP/1.0 500 Internal Server Error\r\nContent-Type: text/html\r\n\r\n<P>Internal Server Error.\r\n" #define HTTP500 "HTTP/1.0 500 Internal Server Error\r\nContent-Type: text/html\r\n\r\n<P>Internal Server Error.\r\n"
static void cannot_execute(int client) { static void cannot_execute(int client) {
send(client, HTTP500, sizeof(HTTP500)-1, 0); send(client, HTTP500, sizeof(HTTP500)-1, 0);
puts("500 Internal Server Error.");
} }
/**********************************************************************/ /**********************************************************************/
@@ -219,8 +211,8 @@ static void cannot_execute(int client) {
* program indicating an error. */ * program indicating an error. */
/**********************************************************************/ /**********************************************************************/
static void error_die(const char *sc) { static void error_die(const char *sc) {
perror(sc); perror(sc);
exit(1); exit(1);
} }
/**********************************************************************/ /**********************************************************************/
@@ -230,93 +222,91 @@ static void error_die(const char *sc) {
* path to the CGI script */ * path to the CGI script */
/**********************************************************************/ /**********************************************************************/
static void execute_cgi(int client, int content_length, const HTTP_REQUEST* request) { static void execute_cgi(int client, int content_length, const HTTP_REQUEST* request) {
int cgi_output[2]; int cgi_output[2], cgi_input[2], i;
int cgi_input[2]; pid_t pid;
pid_t pid;
int i;
if(pipe(cgi_output) < 0 || pipe(cgi_input) < 0 ||(pid = fork()) < 0) cannot_execute(client); if(pipe(cgi_output) < 0 || pipe(cgi_input) < 0 || (pid = fork()) < 0) cannot_execute(client);
/* child: CGI script */ /* child: CGI script */
else if(pid == 0) { else if(pid == 0) {
char env[255]; char env[255];
dup2(cgi_output[1], 1); dup2(cgi_output[1], 1);
dup2(cgi_input[0], 0); dup2(cgi_input[0], 0);
close(cgi_output[0]); close(cgi_output[0]);
close(cgi_input[1]); close(cgi_input[1]);
sprintf(env, "REQUEST_METHOD=%s", request->method); sprintf(env, "REQUEST_METHOD=%s", request->method);
putenv(env); putenv(env);
if(request->method_type == GET) { if(request->method_type == GET) {
sprintf(env, "QUERY_STRING=%s", request->query_string); sprintf(env, "QUERY_STRING=%s", request->query_string);
putenv(env); putenv(env);
} }
else { /* POST */ else { /* POST */
sprintf(env, "CONTENT_LENGTH=%d", content_length); sprintf(env, "CONTENT_LENGTH=%d", content_length);
putenv(env); putenv(env);
} }
execl(request->path, request->path, request->method, request->query_string, NULL); execl(request->path, request->path, request->method, request->query_string, NULL);
exit(0); exit(0);
} }
else { /* parent */ else { /* parent */
char buf[1024]; char buf[1024];
close(cgi_output[1]); close(cgi_output[1]);
close(cgi_input[0]); close(cgi_input[0]);
if(request->method_type == POST) { if(request->method_type == POST) {
#if __APPLE__ #if __APPLE__
for(i = 0; i < content_length;) { for(i = 0; i < content_length;) {
int cnt = recv(client, buf, 1024, 0); int cnt = recv(client, buf, 1024, 0);
if(cnt > 0) { if(cnt > 0) {
write(cgi_input[1], buf, cnt); write(cgi_input[1], buf, cnt);
i += cnt; i += cnt;
} }
} }
#else #else
int len = 0; int len = 0;
while(len < content_length) { while(len < content_length) {
int delta = splice(client, NULL, cgi_input[1], NULL, content_length - len, SPLICE_F_GIFT); int delta = splice(client, NULL, cgi_input[1], NULL, content_length - len, SPLICE_F_GIFT);
if(delta < 0) { if(delta < 0) {
cannot_execute(client); cannot_execute(client);
break; break;
} }
len += delta; len += delta;
} }
#endif #endif
} }
uint32_t cnt = 0; uint32_t cnt = 0;
char* p =(char*)&cnt; char* p = (char*)&cnt;
while(p -(char*)&cnt < sizeof(uint32_t)) { while(p - (char*)&cnt < sizeof(uint32_t)) {
int offset = read(cgi_output[0], p, sizeof(uint32_t)); int offset = read(cgi_output[0], p, sizeof(uint32_t));
if(offset > 0) p += offset; if(offset > 0) p += offset;
else cannot_execute(client); else cannot_execute(client);
} }
printf("cgi msg cnt: %u bytes.\n", cnt); printf("CGI msg len: %u bytes.\n", cnt);
if(cnt > 0) { if(cnt > 0) {
int len = 0; int len = 0;
#if __APPLE__ #if __APPLE__
char* data = malloc(cnt); char* data = malloc(cnt);
while(len < cnt) { while(len < cnt) {
len += read(cgi_output[0], data, cnt); len += read(cgi_output[0], data, cnt);
send(client, data, len, 0); send(client, data, len, 0);
} }
if(data) free(data); if(data) free(data);
#else #else
while(len < cnt) { while(len < cnt) {
int delta = splice(cgi_output[0], NULL, client, NULL, cnt - len, SPLICE_F_GIFT); int delta = splice(cgi_output[0], NULL, client, NULL, cnt - len, SPLICE_F_GIFT);
if(delta < 0) { if(delta < 0) {
cannot_execute(client); cannot_execute(client);
break; break;
} }
len += delta; len += delta;
} }
#endif #endif
printf("cgi send %d bytes\n", len); printf("CGI send %d bytes\n", len);
} }
close(cgi_output[0]); close(cgi_output[0]);
close(cgi_input[1]); close(cgi_input[1]);
waitpid(pid, &i, 0); waitpid(pid, &i, 0);
} }
} }
/**********************************************************************/ /**********************************************************************/
@@ -324,17 +314,14 @@ static void execute_cgi(int client, int content_length, const HTTP_REQUEST* requ
/* Parameters: path of the file */ /* Parameters: path of the file */
/**********************************************************************/ /**********************************************************************/
static uint32_t get_file_size(const char *filepath, int client) { static uint32_t get_file_size(const char *filepath, int client) {
struct stat statbuf; struct stat statbuf;
uint32_t sz; uint32_t sz;
if(!stat(filepath, &statbuf)) { if(!stat(filepath, &statbuf)) {
sz = statbuf.st_size; sz = statbuf.st_size;
printf("file size: %u\n", sz); printf("[%u] - ", sz);
return sz; return sz;
} }
else { else return 0;
cannot_execute(client);
error_die("stat");
}
} }
/**********************************************************************/ /**********************************************************************/
@@ -351,37 +338,33 @@ static uint32_t get_file_size(const char *filepath, int client) {
* Returns: the number of bytes stored(excluding null) */ * Returns: the number of bytes stored(excluding null) */
/**********************************************************************/ /**********************************************************************/
static int get_line(int sock, char *buf, int size) { static int get_line(int sock, char *buf, int size) {
int i = 0; int i = 0;
char c = '\0'; char c = '\0';
int n; int n;
while((i < size - 1) &&(c != '\n')) { while((i < size - 1) && (c != '\n')) {
n = recv(sock, &c, 1, 0); n = recv(sock, &c, 1, 0);
/* DEBUG printf("%02X\n", c); */ if(n > 0) {
if(n > 0) { if(c == '\r') {
if(c == '\r') { n = recv(sock, &c, 1, MSG_PEEK);
n = recv(sock, &c, 1, MSG_PEEK); /* DEBUG printf("%02X\n", c); */
/* DEBUG printf("%02X\n", c); */ if((n > 0) && (c == '\n')) recv(sock, &c, 1, 0);
if((n > 0) &&(c == '\n')) else c = '\n';
recv(sock, &c, 1, 0); }
else c = '\n'; buf[i++] = c;
} } else c = '\n';
buf[i] = c; }
i++; buf[i] = '\0';
}
else c = '\n';
}
buf[i] = '\0';
return(i); return i;
} }
/**********************************************************************/ /**********************************************************************/
/* Handle thread quit signal /* Handle thread quit signal
/**********************************************************************/ /**********************************************************************/
static void handle_quit(int signo) { static void handle_quit(int signo) {
perror("handle"); perror("handle");
pthread_exit(NULL); pthread_exit(NULL);
} }
/**********************************************************************/ /**********************************************************************/
@@ -390,26 +373,29 @@ static void handle_quit(int signo) {
* the name of the file */ * the name of the file */
/**********************************************************************/ /**********************************************************************/
#define ADD_HERDER(h)\ #define ADD_HERDER(h)\
strcpy(buf + offset, h);\ strcpy(buf + offset, h);\
offset += sizeof(h) - 1; offset += sizeof(h) - 1;
#define ADD_HERDER_PARAM(h, p)\ #define ADD_HERDER_PARAM(h, p)\
sprintf(buf + offset, h,(p));\ sprintf(buf + offset, h,(p));\
offset += strlen(buf + offset); offset += strlen(buf + offset);
#define EXTNM_IS_NOT(name)(strcmp(filepath+extpos, name)) #define EXTNM_IS_NOT(name)(strcmp(filepath+extpos, name))
#define HTTP200 "HTTP/1.0 200 OK\r\n" #define HTTP200 "HTTP/1.0 200 OK\r\n"
#define CONTENT_TYPE "Content-Type: %s\r\n" #define CONTENT_TYPE "Content-Type: %s\r\n"
#define CONTENT_LEN "Content-Length: %d\r\n" #define CONTENT_LEN "Content-Length: %d\r\n"
static void headers(int client, const char *filepath) { static int headers(int client, const char *filepath) {
char buf[1024]; char buf[1024];
uint32_t offset = 0; uint32_t offset = 0;
uint32_t extpos = strlen(filepath) - 4; uint32_t extpos = strlen(filepath) - 4;
uint32_t file_size = get_file_size(filepath, client);
ADD_HERDER(HTTP200 SERVER_STRING); if(file_size) {
ADD_HERDER_PARAM(CONTENT_TYPE, EXTNM_IS_NOT("html")?(EXTNM_IS_NOT(".css")?(EXTNM_IS_NOT(".ico")?"text/plain":"image/x-icon"):"text/css"):"text/html"); ADD_HERDER(HTTP200 SERVER_STRING);
ADD_HERDER_PARAM(CONTENT_LEN "\r\n", get_file_size(filepath, client)); ADD_HERDER_PARAM(CONTENT_TYPE, EXTNM_IS_NOT("html")?(EXTNM_IS_NOT(".css")?(EXTNM_IS_NOT(".ico")?"text/plain":"image/x-icon"):"text/css"):"text/html");
send(client, buf, offset, 0); ADD_HERDER_PARAM(CONTENT_LEN "\r\n", file_size);
puts("200 OK."); send(client, buf, offset, 0);
puts("200 OK.");
return 1;
} else return 0;
} }
/**********************************************************************/ /**********************************************************************/
@@ -417,8 +403,8 @@ static void headers(int client, const char *filepath) {
/**********************************************************************/ /**********************************************************************/
#define HTTP404 "HTTP/1.0 404 NOT FOUND\r\n" SERVER_STRING "Content-Type: text/html\r\n\r\n<HTML><TITLE>Not Found</TITLE>\r\n<BODY><P>The server could not fulfill\r\nyour request because the resource specified\r\nis unavailable or nonexistent.\r\n</BODY></HTML>\r\n" #define HTTP404 "HTTP/1.0 404 NOT FOUND\r\n" SERVER_STRING "Content-Type: text/html\r\n\r\n<HTML><TITLE>Not Found</TITLE>\r\n<BODY><P>The server could not fulfill\r\nyour request because the resource specified\r\nis unavailable or nonexistent.\r\n</BODY></HTML>\r\n"
static void not_found(int client) { static void not_found(int client) {
send(client, HTTP404, sizeof(HTTP404)-1, 0); send(client, HTTP404, sizeof(HTTP404)-1, 0);
puts("404 Not Found."); puts("404 Not Found.");
} }
/**********************************************************************/ /**********************************************************************/
@@ -429,15 +415,14 @@ static void not_found(int client) {
* the name of the file to serve */ * the name of the file to serve */
/**********************************************************************/ /**********************************************************************/
static void serve_file(int client, const char *filename) { static void serve_file(int client, const char *filename) {
FILE *resource = NULL; FILE *resource = NULL;
resource = fopen(filename, "rb"); resource = fopen(filename, "rb");
if(resource == NULL) not_found(client); if(resource) {
else { if(headers(client, filename)) cat(client, resource);
headers(client, filename); else not_found(client);
cat(client, resource); fclose(resource);
} } else not_found(client);
fclose(resource);
} }
/**********************************************************************/ /**********************************************************************/
@@ -449,51 +434,41 @@ static void serve_file(int client, const char *filename) {
* Returns: the socket */ * Returns: the socket */
/**********************************************************************/ /**********************************************************************/
#ifdef LISTEN_ON_IPV6 #ifdef LISTEN_ON_IPV6
static socklen_t struct_len = sizeof(struct sockaddr_in6); static socklen_t struct_len = sizeof(struct sockaddr_in6);
static struct sockaddr_in6 name; static struct sockaddr_in6 name;
#else #else
static socklen_t struct_len = sizeof(struct sockaddr_in); static socklen_t struct_len = sizeof(struct sockaddr_in);
static struct sockaddr_in name; static struct sockaddr_in name;
#endif #endif
static int startup(uint16_t *port) { static int startup(uint16_t *port) {
int httpd = 0; int httpd = 0;
#ifdef LISTEN_ON_IPV6 #ifdef LISTEN_ON_IPV6
name.sin6_family = AF_INET6; name.sin6_family = AF_INET6;
name.sin6_port = htons(*port); name.sin6_port = htons(*port);
bzero(&(name.sin6_addr), sizeof(name.sin6_addr)); bzero(&(name.sin6_addr), sizeof(name.sin6_addr));
httpd = socket(PF_INET6, SOCK_STREAM, 0); httpd = socket(PF_INET6, SOCK_STREAM, 0);
#else #else
name.sin_family = AF_INET; name.sin_family = AF_INET;
name.sin_port = htons(*port); name.sin_port = htons(*port);
name.sin_addr.s_addr = INADDR_ANY; name.sin_addr.s_addr = INADDR_ANY;
bzero(&(name.sin_zero), 8); bzero(&(name.sin_zero), 8);
httpd = socket(AF_INET, SOCK_STREAM, 0); httpd = socket(AF_INET, SOCK_STREAM, 0);
#endif #endif
if(httpd == -1) error_die("socket"); if(httpd == -1) error_die("socket");
if(bind(httpd,(struct sockaddr *)&name, struct_len) < 0) error_die("bind"); if(bind(httpd,(struct sockaddr *)&name, struct_len) < 0) error_die("bind");
/* if dynamically allocating a port */ /* if dynamically allocating a port */
if(*port == 0) { if(*port == 0) {
if(getsockname(httpd,(struct sockaddr *)&name, &struct_len) == -1) error_die("getsockname"); if(getsockname(httpd,(struct sockaddr *)&name, &struct_len) == -1) error_die("getsockname");
#ifdef LISTEN_ON_IPV6 #ifdef LISTEN_ON_IPV6
*port = ntohs(name.sin6_port); *port = ntohs(name.sin6_port);
#else #else
*port = ntohs(name.sin_port); *port = ntohs(name.sin_port);
#endif #endif
} }
if(listen(httpd, 5) < 0) error_die("listen"); if(listen(httpd, 5) < 0) error_die("listen");
return(httpd); return(httpd);
}
/**********************************************************************/
/* Inform the client that the requested web method has not been
* implemented.
* Parameter: the client socket */
/**********************************************************************/
#define HTTP414 "HTTP/1.0 414 Request-URI Too Long\r\n" SERVER_STRING "Content-Type: text/html\r\n\r\n<HTML><HEAD><TITLE>Request-URI Too Long\r\n</TITLE></HEAD>\r\n<BODY><P>HTTP request url length is over 254 chars.\r\n</BODY></HTML>\r\n"
static void toolong(int client) {
send(client, HTTP414, sizeof(HTTP414)-1, 0);
} }
/**********************************************************************/ /**********************************************************************/
@@ -503,65 +478,66 @@ static void toolong(int client) {
/**********************************************************************/ /**********************************************************************/
#define HTTP501 "HTTP/1.0 501 Method Not Implemented\r\n" SERVER_STRING "Content-Type: text/html\r\n\r\n<HTML><HEAD><TITLE>Method Not Implemented\r\n</TITLE></HEAD>\r\n<BODY><P>HTTP request method not supported.\r\n</BODY></HTML>\r\n" #define HTTP501 "HTTP/1.0 501 Method Not Implemented\r\n" SERVER_STRING "Content-Type: text/html\r\n\r\n<HTML><HEAD><TITLE>Method Not Implemented\r\n</TITLE></HEAD>\r\n<BODY><P>HTTP request method not supported.\r\n</BODY></HTML>\r\n"
static void unimplemented(int client) { static void unimplemented(int client) {
send(client, HTTP501, sizeof(HTTP501)-1, 0); send(client, HTTP501, sizeof(HTTP501)-1, 0);
puts("501 Method Not Implemented.");
} }
/**********************************************************************/ /**********************************************************************/
/* simple-http-server /* simple-http-server
* Usage: simple-http-server -d port chdir * Usage: simple-http-server [-d] [-p <port>] [-r <rootdir>] [-u <uid>]
/**********************************************************************/ /**********************************************************************/
#define ACCEPT_CLI() {\ #define accept_client(client_sock, server_sock, client_name, client_name_len, newthread) {\
while(1) {\ while(1) {\
client_sock = accept(server_sock,(struct sockaddr *)&client_name, &client_name_len);\ client_sock = accept(server_sock,(struct sockaddr *)&client_name, &client_name_len);\
if(client_sock == -1) break;\ if(client_sock == -1) break;\
signal(SIGQUIT, handle_quit);\ signal(SIGQUIT, handle_quit);\
signal(SIGPIPE, handle_quit);\ signal(SIGPIPE, handle_quit);\
if(pthread_create(&newthread, NULL, accept_request, client_sock) != 0) perror("pthread_create");\ if(pthread_create(&newthread, NULL, accept_request, client_sock) != 0) perror("pthread_create");\
}\ }\
close(client_sock);\ close(client_sock);\
error_die("accept");\ error_die("accept");\
} }
#define argequ(arg) (*(uint16_t*)argv[i] == *(uint16_t*)(arg)) #define argequ(arg) (*(uint16_t*)argv[i] == *(uint16_t*)(arg))
int main(int argc, char **argv) { int main(int argc, char **argv) {
if(argc > 8) puts("Usage:\tsimple-http-server [-d] [-p <port>] [-r <rootdir>] [-u <uid>]\n -d:\trun as daemon.\n -p:\tif not set, choose a random one.\n -r:\thttp root dir.\n -u:\trun as this uid."); if(argc > 8) puts("Usage:\tsimple-http-server [-d] [-p <port>] [-r <rootdir>] [-u <uid>]\n -d:\trun as daemon.\n -p:\tif not set, choose a random one.\n -r:\thttp root dir.\n -u:\trun as this uid.");
else { else {
int as_daemon = 0; int as_daemon = 0;
uint16_t port = 0; uint16_t port = 0;
char *cdir = "./"; char *cdir = "./";
uid_t uid = -1; uid_t uid = -1;
int server_sock = -1; int server_sock = -1;
int client_sock = -1; int client_sock = -1;
int pid = -1; int pid = -1;
struct sockaddr_in client_name; struct sockaddr_in client_name;
socklen_t client_name_len = sizeof(client_name); socklen_t client_name_len = sizeof(client_name);
pthread_t newthread; pthread_t newthread;
for(int i = 1; i < argc; i++) { for(int i = 1; i < argc; i++) {
if(!as_daemon && argequ("-d")) as_daemon = 1; if(!as_daemon && argequ("-d")) as_daemon = 1;
else if(argequ("-p")) port = (uint16_t)atoi(argv[i + 1]); else if(argequ("-p")) port = (uint16_t)atoi(argv[i + 1]);
else if(argequ("-r")) cdir = argv[i + 1]; else if(argequ("-r")) cdir = argv[i + 1];
else if(argequ("-u")) uid = atoi(argv[i + 1]); else if(argequ("-u")) uid = atoi(argv[i + 1]);
} }
if(chdir(cdir)) error_die("chdir"); if(chdir(cdir)) error_die("chdir");
server_sock = startup(&port); server_sock = startup(&port);
printf("httpd running on 0.0.0.0:%d at %s\n", port, cdir); printf("httpd running on 0.0.0.0:%d at %s\n", port, cdir);
if(as_daemon) { if(as_daemon) {
if(uid > 0) { if(uid > 0) {
setuid(uid); setuid(uid);
setgid(uid); setgid(uid);
} }
pid = fork(); pid = fork();
if(pid == 0) pid = fork(); if(pid == 0) pid = fork();
else return 0; else return 0;
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 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); wait(NULL);
puts("Server subprocess exited. Restart..."); puts("Server subprocess exited. Restart...");
pid = fork(); pid = fork();
} }
if(pid < 0) perror("fork"); if(pid < 0) perror("fork");
else ACCEPT_CLI(); else accept_client(client_sock, server_sock, client_name, client_name_len, newthread);
} else ACCEPT_CLI(); } else accept_client(client_sock, server_sock, client_name, client_name_len, newthread);
} }
} }