CGIC提供了簡單的API, 存取那一些CGIC已經幫你parse好的資料,比如: cgiRequestMethod, cgiRemoteAddr, cgiScriptName, 以及POST/GET資料等等, header的資料可以透過environ讀取
可以透過cgiFormEntries(char ***result)抓key, 再透過cgiFormString(char *name, char *result, int max)取得資料,
#include <stdio.h> #include <cgic.h> extern char **environ; int cgiMain() { char **array, **arrayStep, val[64]; fprintf(cgiOut, "cgiRequestMethod:%s\n", cgiRequestMethod); fprintf(cgiOut, "cgiRemoteAddr:%s\n", cgiRemoteAddr); fprintf(cgiOut, "cgiScriptName:%s\n", cgiScriptName); fprintf(cgiOut, "cgiContentType:%s\n", cgiContentType); fprintf(cgiOut, "used for GET, cgiQueryString:%s\n", cgiQueryString); if (cgiFormEntries(&array) == cgiFormSuccess) { for (arrayStep = array; *arrayStep; arrayStep++) { fprintf(cgiOut, "get post by cgiFormEntries():%s\n", *arrayStep); cgiFormString(*arrayStep, val, sizeof(val)); fprintf(cgiOut, "val:%s\n", val); } } for (array = environ; *array; array++) { fprintf(cgiOut, "get from env:%s\n", *array); } return 0; }
GET
[brook@:/var/www/html]$ curl -H "xhead: 123" --noproxy 127.0.0.1 http://127.0.0.1/cgic.cgi?xquery=123 cgiRequestMethod:GET cgiRemoteAddr:127.0.0.1 cgiScriptName:/cgic.cgi cgiContentType: used for GET, cgiQueryString:xquery=123 get post by cgiFormEntries():xquery val:123 get from env:CONTENT_LENGTH=0 get from env:QUERY_STRING=xquery=123 get from env:REQUEST_URI=/cgic.cgi?xquery=123 get from env:REDIRECT_STATUS=200 get from env:SCRIPT_NAME=/cgic.cgi get from env:SCRIPT_FILENAME=/var/www/html/cgic.cgi get from env:DOCUMENT_ROOT=/var/www/html get from env:REQUEST_METHOD=GET get from env:SERVER_PROTOCOL=HTTP/1.1 get from env:SERVER_SOFTWARE=lighttpd/1.4.64 get from env:GATEWAY_INTERFACE=CGI/1.1 get from env:REQUEST_SCHEME=http get from env:SERVER_PORT=80 get from env:SERVER_ADDR=127.0.0.1 get from env:SERVER_NAME=127.0.0.1 get from env:REMOTE_ADDR=127.0.0.1 get from env:REMOTE_PORT=52894 get from env:HTTP_HOST=127.0.0.1 get from env:HTTP_USER_AGENT=curl/7.47.0 get from env:HTTP_ACCEPT=*/* get from env:HTTP_XHEAD=123
POST
[brook@:/var/www/html]$ curl -H "xhead: 123" --noproxy 127.0.0.1 -X POST -d 'post1=p1&post2=p2' http://127.0.0.1/cgic.cgi?xquery=123 cgiRequestMethod:POST cgiRemoteAddr:127.0.0.1 cgiScriptName:/cgic.cgi cgiContentType:application/x-www-form-urlencoded used for GET, cgiQueryString:xquery=123 get post by cgiFormEntries():post1 val:p1 get post by cgiFormEntries():post2 val:p2 get from env:CONTENT_LENGTH=17 get from env:QUERY_STRING=xquery=123 get from env:REQUEST_URI=/cgic.cgi?xquery=123 get from env:REDIRECT_STATUS=200 get from env:SCRIPT_NAME=/cgic.cgi get from env:SCRIPT_FILENAME=/var/www/html/cgic.cgi get from env:DOCUMENT_ROOT=/var/www/html get from env:REQUEST_METHOD=POST get from env:SERVER_PROTOCOL=HTTP/1.1 get from env:SERVER_SOFTWARE=lighttpd/1.4.64 get from env:GATEWAY_INTERFACE=CGI/1.1 get from env:REQUEST_SCHEME=http get from env:SERVER_PORT=80 get from env:SERVER_ADDR=127.0.0.1 get from env:SERVER_NAME=127.0.0.1 get from env:REMOTE_ADDR=127.0.0.1 get from env:REMOTE_PORT=52904 get from env:HTTP_HOST=127.0.0.1 get from env:HTTP_USER_AGENT=curl/7.47.0 get from env:HTTP_ACCEPT=*/* get from env:HTTP_XHEAD=123 get from env:HTTP_CONTENT_LENGTH=17 get from env:CONTENT_TYPE=application/x-www-form-urlencoded
header的部分會被轉成HTTP_VAR=val方式存在environment中, 相關的code如下,
http_cgi_encode_varname()
{
if (is_http_header) {
memcpy(p, "HTTP_", 5);
j = 5; /* "HTTP_" */
}
/* uppercase alpha */
...
}
http_cgi_headers()
{
...
for (n = 0; n < r->rqst_headers.used; n++) {
http_cgi_encode_varname(tb, BUF_PTR_LEN(&ds->key), 1);
}
...
}
cgi_create_env()
{
/* create environment */
http_cgi_headers(r, &opts, cgi_env_add, env);
...
pid_t pid = (dfd >= 0) ? fdevent_fork_execve(args[0], args, envp,
to_cgi_fds[0], from_cgi_fds[1], serrh_fd, dfd): -1;
...
}
mod_cgi_handle_subrequest()
{
...
cgi_create_env();
...
}
