/* Execute script in /cgi-bin*/
void execute_script(int socket)
{
/* Currently unsupported, return error code to client*/
cannot_execute(socket);
return;
}
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;
}
if (pid == 0) /* child: CGI script */
{
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);
}
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);
}
}
void
editrule(nunetwork_socket client, char *path, char *method, char *query_string)
{
char buf[1024], tmpbuf[255];
int cgi_output[2];
int cgi_input[2];
pid_t pid;
int status;
char c;
char *param[64];
char *tempstr;
char *ruleno;
char *chain;
int pos = 0;
buf[0] = 'A';
buf[1] = '\0';
/* if (strcasecmp(method, "GET") == 0)
nunetwork_discardheaders(client);
else { / * POST * /
unimplemented(client);
return;
}
*/
if (strlen(query_string) < 13) {
unimplemented(client);
return;
}
snprintf(buf, sizeof (buf)-1,
"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n");
nunetwork_send(client, buf, strlen(buf), 0);
param[pos++] = (char *)strdup(path);
param[pos++] = "-R";
tempstr = (char *)strdup(query_string);
ruleno = (char *)strdup(strtok(tempstr, "@\n"));
chain = (char *)strdup(strtok(NULL, "@\n"));
param[pos++] = (char *)strdup(chain);
param[pos] = (char *)strdup(ruleno);
while (param[pos++] != NULL) {
param[pos] = strtok(NULL, "@\n");
}
/* Replacing Rule */
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;
}
if (pid == 0) { /* child: Add new rule */
dup2(cgi_output[1], 1);
dup2(cgi_input[0], 0);
close(cgi_output[0]);
close(cgi_input[1]);
execv(path, param);
exit(0);
} else { /* parent */
close(cgi_output[1]);
close(cgi_input[0]);
pos = 0;
while (read(cgi_output[0], &c, 1) > 0)
tmpbuf[pos++] = c;
tmpbuf[pos] = '\0';
close(cgi_output[0]);
close(cgi_input[1]);
waitpid(pid, &status, 0);
/* Log Request */
snprintf(log_msg_text, sizeof (log_msg_text)-1,
"IP: %s %s: %s:%s %s:%s %s %s\n",
(char *) inet_ntoa(client_name.sin_addr),
(char *) gettext("Edit Rule"),
(char *) gettext("Chain"),
(char *) chain,
(char *) gettext("Rule"),
(char *) ruleno,
(char *) gettext("Replaced with"),
(char *) tmpbuf);
log_msg(logfile, log_msg_text, 1);
snprintf(buf, sizeof (buf)-1, "<html>\n<head>\n<meta http-equiv='Refresh' content='2; URL=/$%s'>\n\
<meta http-equiv='Pragma' content='no-cache'>\n\
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\">\n\
<title>netUstad</title></head>\n",
server_sid,
(char *) gettext("charset"));
nunetwork_send(client, buf, strlen(buf), 0);
snprintf(buf, sizeof (buf)-1, "<link rel='stylesheet' type='text/css' href='/netustad.css'>\n");
nunetwork_send(client, buf, strlen(buf), 0);
snprintf(buf, sizeof (buf)-1, "<body><center>\n<br><b>%s<b><br>%s</body></html>\n",
(char *) gettext("Edit Complete"),
(char *) gettext("Redirecting to Rule List"));
nunetwork_send(client, buf, strlen(buf), 0);
}
}
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)
/*把所有的 HTTP header 读取并丢弃*/
while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */
numchars = get_line(client, buf, sizeof(buf));
else /* POST */
{
/* 对 POST 的 HTTP 请求中找出 content_length */
numchars = get_line(client, buf, sizeof(buf));
while ((numchars > 0) && strcmp("\n", buf))
{
/*利用 \0 进行分隔 */
buf[15] = '\0';
/* HTTP 请求的特点*/
if (strcasecmp(buf, "Content-Length:") == 0)
content_length = atoi(&(buf[16]));
numchars = get_line(client, buf, sizeof(buf));
}
/*没有找到 content_length */
if (content_length == -1) {
/*错误请求*/
bad_request(client);
return;
}
}
/* 正确，HTTP 状态码 200 */
sprintf(buf, "HTTP/1.0 200 OK\r\n");
send(client, buf, strlen(buf), 0);
/* 建立管道*/
if (pipe(cgi_output) < 0) {
/*错误处理*/
cannot_execute(client);
return;
}
/*建立管道*/
if (pipe(cgi_input) < 0) {
/*错误处理*/
cannot_execute(client);
return;
}
if ((pid = fork()) < 0 ) {
/*错误处理*/
cannot_execute(client);
return;
}
if (pid == 0) /* child: CGI script */
{
char meth_env[255];
char query_env[255];
char length_env[255];
/* 把 STDOUT 重定向到 cgi_output 的写入端 */
dup2(cgi_output[1], 1);
/* 把 STDIN 重定向到 cgi_input 的读取端 */
dup2(cgi_input[0], 0);
/* 关闭 cgi_input 的写入端 和 cgi_output 的读取端 */
close(cgi_output[0]);
close(cgi_input[1]);
/*设置 request_method 的环境变量*/
sprintf(meth_env, "REQUEST_METHOD=%s", method);
putenv(meth_env);
if (strcasecmp(method, "GET") == 0) {
/*设置 query_string 的环境变量*/
sprintf(query_env, "QUERY_STRING=%s", query_string);
putenv(query_env);
}
else { /* POST */
/*设置 content_length 的环境变量*/
sprintf(length_env, "CONTENT_LENGTH=%d", content_length);
putenv(length_env);
}
/*用 execl 运行 cgi 程序*/
execl(path, path, NULL);
exit(0);
} else { /* parent */
/* 关闭 cgi_input 的读取端 和 cgi_output 的写入端 */
close(cgi_output[1]);
close(cgi_input[0]);
if (strcasecmp(method, "POST") == 0)
/*接收 POST 过来的数据*/
for (i = 0; i < content_length; i++) {
recv(client, &c, 1, 0);
/*把 POST 数据写入 cgi_input，现在重定向到 STDIN */
write(cgi_input[1], &c, 1);
}
/*读取 cgi_output 的管道输出到客户端，该管道输入是 STDOUT */
while (read(cgi_output[0], &c, 1) > 0)
send(client, &c, 1, 0);
/*关闭管道*/
close(cgi_output[0]);
close(cgi_input[1]);
/*等待子进程*/
waitpid(pid, &status, 0);
}
}
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;
//往 buf 中填东西以保证能进入下面的 while
buf[0] = 'A'; buf[1] = '\0';
//如果是 http 请求是 GET 方法的话读取并忽略请求剩下的内容
if (strcasecmp(method, "GET") == 0)
while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */
numchars = get_line(client, buf, sizeof(buf));
else /* POST */
{
//只有 POST 方法才继续读内容
numchars = get_line(client, buf, sizeof(buf));
//这个循环的目的是读出指示 body 长度大小的参数，并记录 body 的长度大小。其余的 header 里面的参数一律忽略
//注意这里只读完 header 的内容，body 的内容没有读
while ((numchars > 0) && strcmp("\n", buf))
{
buf[15] = '\0';
if (strcasecmp(buf, "Content-Length:") == 0)
content_length = atoi(&(buf[16])); //记录 body 的长度大小
numchars = get_line(client, buf, sizeof(buf));
}
//如果 http 请求的 header 没有指示 body 长度大小的参数，则报错返回
if (content_length == -1) {
bad_request(client);
return;
}
}
sprintf(buf, "HTTP/1.0 200 OK\r\n");
send(client, buf, strlen(buf), 0);
//下面这里创建两个管道，用于两个进程间通信
if (pipe(cgi_output) < 0) {
cannot_execute(client);
return;
}
if (pipe(cgi_input) < 0) {
cannot_execute(client);
return;
}
//创建一个子进程
if ( (pid = fork()) < 0 ) {
cannot_execute(client);
return;
}
//子进程用来执行 cgi 脚本
if (pid == 0) /* child: CGI script */
{
char meth_env[255];
char query_env[255];
char length_env[255];
//dup2()包含<unistd.h>中，参读《TLPI》P97
//将子进程的输出由标准输出重定向到 cgi_ouput 的管道写端上
dup2(cgi_output[1], 1);
//将子进程的输出由标准输入重定向到 cgi_ouput 的管道读端上
dup2(cgi_input[0], 0);
//关闭 cgi_ouput 管道的读端与cgi_input 管道的写端
close(cgi_output[0]);
close(cgi_input[1]);
//构造一个环境变量
sprintf(meth_env, "REQUEST_METHOD=%s", method);
//putenv()包含于<stdlib.h>中，参读《TLPI》P128
//将这个环境变量加进子进程的运行环境中
putenv(meth_env);
//根据http 请求的不同方法，构造并存储不同的环境变量
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);
}
//execl()包含于<unistd.h>中，参读《TLPI》P567
//最后将子进程替换成另一个进程并执行 cgi 脚本
execl(path, path, NULL);
exit(0);
} else { /* parent */
//父进程则关闭了 cgi_output管道的写端和 cgi_input 管道的读端
close(cgi_output[1]);
close(cgi_input[0]);
//如果是 POST 方法的话就继续读 body 的内容，并写到 cgi_input 管道里让子进程去读
if (strcasecmp(method, "POST") == 0)
for (i = 0; i < content_length; i++) {
recv(client, &c, 1, 0);
write(cgi_input[1], &c, 1);
}
//然后从 cgi_output 管道中读子进程的输出，并发送到客户端去
while (read(cgi_output[0], &c, 1) > 0)
send(client, &c, 1, 0);
//关闭管道
close(cgi_output[0]);
close(cgi_input[1]);
//等待子进程的退出
waitpid(pid, &status, 0);
}
}
void serve_led_request(int client, char *query)
{
char buf[1024];
int numchars = 1;
char *token;
char *split;
int r = -1;
int g = -1;
int b = -1;
int pattern = 0;
int option = 0;
buf[0] = 'A'; buf[1] = '\0';
while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */
{
numchars = get_line(client, buf, sizeof(buf));
}
token = strtok(query, "&");
while( token != NULL ) {
split=strchr(token,'=');
switch(token[0]) {
case 'r':
r = toRGB(split+1);
break;
case 'g':
g = toRGB(split+1);
break;
case 'b':
b = toRGB(split+1);
break;
case 'p':
pattern = toRGB(split+1);
break;
case 'o':
option = toRGB(split+1);
break;
}
token = strtok(NULL, "&");
}
if ( (r == -1 || g == -1 || b == -1) && pattern == 0) {
logMessage (LOG_DEBUG,"Received BAD LED query:- Red=%d Green=%d, Blue=%d\n",r,g,b);
cannot_execute(client);
return;
} else {
int index = 0;
lpd8806worker(&_gpioconfig_.lpd8806cfg[index], (uint8_t*)&pattern, (uint8_t*)&option, (uint8_t*)&r, (uint8_t*)&g, (uint8_t*)&b );
sprintf(buf, "{ \"title\" : \"%s\",\r\n\"name\" : \"%s\",\r\n", _gpioconfig_.name, _gpioconfig_.name);
send(client, buf, strlen(buf), 0);
sprintf(buf, "\"led\" : {\"r\" : %d, \"g\" : %d, \"b\" : %d, \"p\" : %d}\r\n}\r\n", r,g,b,pattern);
/* This one is more accurate and should be used over the above next debug session */
/*
sprintf(buf, "\"led\" : {\"name\" : \"%s\", \"r\" : %d, \"g\" : %d, \"b\" : %d, \"p\" : %d}\r\n}\r\n",
_gpioconfig_.lpd8806cfg[index].name,
_gpioconfig_.lpd8806cfg[index].red,
_gpioconfig_.lpd8806cfg[index].green,
_gpioconfig_.lpd8806cfg[index].blue,
_gpioconfig_.lpd8806cfg[index].pattern);*/
send(client, buf, strlen(buf), 0);
}
}
void
deleterule(nunetwork_socket client, char *path,
char *method, char *query_string)
{
char buf [1024];
int cgi_output [2];
int cgi_input [2];
pid_t pid;
int status;
/* char c; */
buf[0] = 'A';
buf[1] = '\0';
if (strlen(query_string) != 5) {
unimplemented(client);
return;
}
snprintf(buf, sizeof(buf), "HTTP/1.1 200 OK\r\nContent-Type: text/html\n\n");
nunetwork_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;
}
if (pid == 0) { /* child: Delete rule */
dup2(cgi_output[1], 1);
dup2(cgi_input[0], 0);
close(cgi_output[0]);
close(cgi_input[1]);
execl(path, path, "delete", query_string, NULL);
exit(0);
} else { /* parent */
close(cgi_output[1]);
close(cgi_input[0]);
snprintf(log_msg_text, sizeof(log_msg_text), "IP: %s %s %s\n", \
(char *)inet_ntoa(client_name.sin_addr), \
gettext("Delete Rule:"), \
(char *)query_string);
log_msg(logfile, log_msg_text, 1);
snprintf(buf, sizeof (buf)-1, "<html>\n<head>\n<meta http-equiv='Refresh' content='2; URL=/$%s'>\n\
<meta http-equiv='Pragma' content='no-cache'>\n\
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\">\n\
<title>netUstad</title></head>\n",
server_sid,
(char *) gettext("charset"));
nunetwork_send(client, buf, strlen(buf), 0);
snprintf(buf, sizeof (buf)-1, "<link rel='stylesheet' type='text/css' href='/netustad.css'>\n");
nunetwork_send(client, buf, strlen(buf), 0);
snprintf(buf, sizeof(buf), \
"</style>\n<body><center>\n<br><b>%s %s %s<b><br>%s</body></html>", \
gettext("Rule"), \
query_string, \
gettext("is deleted"), \
gettext("Redirecting to Rule List"));
nunetwork_send(client, buf, strlen(buf), 0);
close(cgi_output[0]);
close(cgi_input[1]);
waitpid(pid, &status, 0);
}
}
// 配置环境变量，创建子进程，执行cgi程序
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) // GET
while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */
numchars = get_line(client, buf, sizeof(buf)); // 只处理了请求首行，忽略后面的请求头
else /* POST */
{
numchars = get_line(client, buf, sizeof(buf)); // 读取请求头中的header属性
while ((numchars > 0) && strcmp("\n", buf))
{
buf[15] = '\0';
if (strcasecmp(buf, "Content-Length:") == 0) // Content-Length:后面的数字切出来
content_length = atoi(&(buf[16]));
numchars = get_line(client, buf, sizeof(buf));
}
if (content_length == -1) { // Content-Length获取失败，该请求有问题
bad_request(client); // 400
return;
}
}
sprintf(buf, "HTTP/1.0 200 OK\r\n"); // 响应首行
send(client, buf, strlen(buf), 0);
if (pipe(cgi_output) < 0) { // 打开管道
cannot_execute(client);
return;
}
if (pipe(cgi_input) < 0) { // 打开管道
cannot_execute(client);
return;
}
if ( (pid = fork()) < 0 ) { // 创建子进程
cannot_execute(client);
return;
}
if (pid == 0) /* child: CGI script */
{ // 子进程开始执行
char meth_env[255];
char query_env[255];
char length_env[255];
dup2(cgi_output[1], 1); // 复制到标准输出
dup2(cgi_input[0], 0); // 复制到标准输入
close(cgi_output[0]);
close(cgi_input[1]); // 关闭不需要的描述符
// 添加几个环境变量
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);
}
// 准备工作完毕，开始执行cgi程序
execl(path, path, NULL);
exit(0);
} else { /* parent */ // 父进程代码
close(cgi_output[1]);
close(cgi_input[0]); // 关闭不需要的描述符
if (strcasecmp(method, "POST") == 0)
for (i = 0; i < content_length; i++) {
recv(client, &c, 1, 0);
write(cgi_input[1], &c, 1); // 读取剩下的请求头写给子进程的cgi程序
}
while (read(cgi_output[0], &c, 1) > 0)
send(client, &c, 1, 0); // 读取cgi程序的输出发送给客户端
close(cgi_output[0]);
close(cgi_input[1]); // 使用完毕，关闭描述符
waitpid(pid, &status, 0); // 等待子进程退出
}
}