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|
/* HTTPSERV.C (c)Copyright Jan Jaeger, 2002-2009 */
/* HTTP Server */
/* This file contains all code required for the HTTP server, */
/* when the http_server thread is started it will listen on */
/* the HTTP port specified on the HTTPPORT config statement. */
/* */
/* When a request comes in a http_request thread is started, */
/* which will handle the request. */
/* */
/* When authentification is required (auth parm on the HTTPPORT */
/* statement) then the user will be authenticated based on the */
/* userid and password supplied on the HTTPPORT statement, if */
/* these where not supplied then the userid and password of the */
/* that hercules is running under will be used. In the latter case */
/* the root userid/password will also be accepted. */
/* */
/* If the request is for a /cgi-bin/ path, then the cgibin */
/* directory in cgibin.c will be searched, for any other request */
/* the sysblk.httproot (/usr/local/hercules) will be used as the */
/* root to find the specified file. */
/* */
/* As realpath() is used to verify that the files are from within */
/* the sysblk.httproot tree symbolic links that refer to files */
/* outside the sysblk.httproot tree are not supported. */
/* */
/* */
/* Jan Jaeger - 28/03/2002 */
#include "hstdinc.h"
#define _HTTPSERV_C_
#define _HENGINE_DLL_
#include "hercules.h"
#include "httpmisc.h"
#include "hostinfo.h"
#if defined(OPTION_HTTP_SERVER)
/* External reference to the cgi-bin directory in cgibin.c */
extern CGITAB cgidir[];
static MIMETAB mime_types[] = {
{ NULL, NULL }, /* No suffix entry */
{ "txt", "text/plain" },
{ "jcl", "text/plain" },
{ "gif", "image/gif" },
{ "jpg", "image/jpeg" },
{ "css", "text/css" },
{ "html", "text/html" },
{ "htm", "text/html" },
/* This one should be:
{ "ico", "image/vnd.microsoft.icon" },
but Apache 2 sets it as: */
{ "ico", "image/x-icon" },
/* so we'll go with what's actually in use. --JRM */
{ NULL, NULL } }; /* Default suffix entry */
DLL_EXPORT int html_include(WEBBLK *webblk, char *filename)
{
FILE *inclfile;
char fullname[HTTP_PATH_LENGTH];
char buffer[HTTP_PATH_LENGTH];
int ret;
strlcpy( fullname, sysblk.httproot, sizeof(fullname) );
strlcat( fullname, filename, sizeof(fullname) );
inclfile = fopen(fullname,"rb");
if (!inclfile)
{
logmsg(_("HHCHT011E html_include: Cannot open %s: %s\n"),
fullname,strerror(errno));
hprintf(webblk->sock,_("ERROR: Cannot open %s: %s\n"),
filename,strerror(errno));
return FALSE;
}
while (!feof(inclfile))
{
ret = fread(buffer, 1, sizeof(buffer), inclfile);
if (ret <= 0) break;
hwrite(webblk->sock,buffer, ret);
}
fclose(inclfile);
return TRUE;
}
DLL_EXPORT void html_header(WEBBLK *webblk)
{
if (webblk->request_type != REQTYPE_POST)
hprintf(webblk->sock,"Expires: 0\n");
hprintf(webblk->sock,"Content-type: text/html\n\n");
if (!html_include(webblk,HTML_HEADER))
hprintf(webblk->sock,"<HTML>\n<HEAD>\n<TITLE>Hercules</TITLE>\n</HEAD>\n<BODY>\n\n");
}
DLL_EXPORT void html_footer(WEBBLK *webblk)
{
if (!html_include(webblk,HTML_FOOTER))
hprintf(webblk->sock,"\n</BODY>\n</HTML>\n");
}
static void http_exit(WEBBLK *webblk)
{
CGIVAR *cgivar;
int rc;
if(webblk)
{
/* MS SDK docs state:
"To assure that all data is sent and received on a connected
socket before it is closed, an application should use shutdown
to close connection before calling closesocket. For example,
to initiate a graceful disconnect:
1, Call WSAAsyncSelect to register for FD_CLOSE notification.
2. Call shutdown with how=SD_SEND.
3. When FD_CLOSE received, call recv until zero returned,
or SOCKET_ERROR.
4. Call closesocket.
Note: The shutdown function does not block regardless of the
SO_LINGER setting on the socket."
*/
// Notify other end of connection to not expect any more data from us.
// They should detect this via their own 'recv' returning zero bytes
// (thus letting them know they've thus received all the data from us
// they're ever going to receive). They should then do their own
// 'shutdown(s,SHUT_WR)' at their end letting US know we're also not
// going to be receiving any more data from THEM. This is called a
// "graceful close" of the connection...
shutdown( webblk->sock, SHUT_WR );
// Now wait for them to shudown THEIR end of the connection (i.e. wait
// for them to do their own 'shutdown(s,SHUT_WR)') by "hanging" on a
// 'recv' call until we either eventually detect they've shutdown their
// end of the connection (0 bytes received) or else an error occurs...
do
{
BYTE c;
rc = read_socket( webblk->sock, &c, 1 );
}
while ( rc > 0 );
// NOW we can SAFELY close the socket since we now KNOW for CERTAIN
// that they've received ALL of the data we previously sent to them...
// (otherwise they wouldn't have close their connection on us!)
close_socket( webblk->sock );
if(webblk->user) free(webblk->user);
if(webblk->request) free(webblk->request);
cgivar = webblk->cgivar;
while(cgivar)
{
CGIVAR *tmpvar = cgivar->next;
free(cgivar->name);
free(cgivar->value);
free(cgivar);
cgivar = tmpvar;
}
free(webblk);
}
exit_thread(NULL);
}
static void http_error(WEBBLK *webblk, char *err, char *header, char *info)
{
hprintf(webblk->sock,"HTTP/1.0 %s\n%sConnection: close\n"
"Content-Type: text/html\n\n"
"<HTML><HEAD><TITLE>%s</TITLE></HEAD>"
"<BODY><H1>%s</H1><P>%s</BODY></HTML>\n\n",
err, header, err, err, info);
http_exit(webblk);
}
static char *http_timestring(char *time_buff,int buff_size, time_t t)
{
struct tm *tm = localtime(&t);
strftime(time_buff, buff_size, "%a, %d %b %Y %H:%M:%S %Z", tm);
return time_buff;
}
static void http_decode_base64(char *s)
{
char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int bit_o, byte_o, idx, i, n;
unsigned char *d = (unsigned char *)s;
char *p;
n = i = 0;
while (*s && (p = strchr(b64, *s)))
{
idx = (int)(p - b64);
byte_o = (i*6)/8;
bit_o = (i*6)%8;
d[byte_o] &= ~((1<<(8-bit_o))-1);
if (bit_o < 3)
{
d[byte_o] |= (idx << (2-bit_o));
n = byte_o+1;
}
else
{
d[byte_o] |= (idx >> (bit_o-2));
d[byte_o+1] = 0;
d[byte_o+1] |= (idx << (8-(bit_o-2))) & 0xFF;
n = byte_o+2;
}
s++; i++;
}
/* null terminate */
d[n] = 0;
}
static char *http_unescape(char *buffer)
{
char *pointer = buffer;
while ( (pointer = strchr(pointer,'+')) )
*pointer = ' ';
pointer = buffer;
while (pointer && *pointer && (pointer = strchr(pointer,'%')))
{
int highnibble = pointer[1];
int lownibble = pointer[2];
if (highnibble >= '0' && highnibble <= '9')
highnibble = highnibble - '0';
else if (highnibble >= 'A' && highnibble <= 'F')
highnibble = 10 + highnibble - 'A';
else if (highnibble >= 'a' && highnibble <= 'f')
highnibble = 10 + highnibble - 'a';
else
{
pointer++;
continue;
}
if (lownibble >= '0' && lownibble <= '9')
lownibble = lownibble - '0';
else if (lownibble >= 'A' && lownibble <= 'F')
lownibble = 10 + lownibble - 'A';
else if (lownibble >= 'a' && lownibble <= 'f')
lownibble = 10 + lownibble - 'a';
else
{
pointer++;
continue;
}
*pointer = (highnibble<<4) | lownibble;
memmove(pointer+1, pointer+3, strlen(pointer+3)+1);
pointer++;
}
return buffer;
}
static void http_interpret_variable_string(WEBBLK *webblk, char *qstring, int type)
{
char *name;
char *value;
char *strtok_str;
CGIVAR **cgivar;
for (cgivar = &(webblk->cgivar);
*cgivar;
cgivar = &((*cgivar)->next));
for (name = strtok_r(qstring,"&; ",&strtok_str);
name;
name = strtok_r(NULL,"&; ",&strtok_str))
{
if(!(value = strchr(name,'=')))
continue;
*value++ = '\0';
(*cgivar) = malloc(sizeof(CGIVAR));
(*cgivar)->next = NULL;
(*cgivar)->name = strdup(http_unescape(name));
(*cgivar)->value = strdup(http_unescape(value));
(*cgivar)->type = type;
cgivar = &((*cgivar)->next);
}
}
#if 0
static void http_dump_cgi_variables(WEBBLK *webblk)
{
CGIVAR *cv;
for(cv = webblk->cgivar; cv; cv = cv->next)
logmsg(_("HHCHT012I cgi_var_dump: pointer(%p) name(%s) value(%s) type(%d)\n"),
cv, cv->name, cv->value, cv->type);
}
#endif
DLL_EXPORT char *http_variable(WEBBLK *webblk, char *name, int type)
{
CGIVAR *cv;
for(cv = webblk->cgivar; cv; cv = cv->next)
if((cv->type & type) && !strcmp(name,cv->name))
return cv->value;
return NULL;
}
static void http_verify_path(WEBBLK *webblk, char *path)
{
char resolved_path[HTTP_PATH_LENGTH];
#if 0
int i;
for (i = 0; path[i]; i++)
if (!isalnum((int)path[i]) && !strchr("/.-_", path[i]))
http_error(webblk, "404 File Not Found","",
"Illegal character in filename");
#endif
if (!realpath( path, resolved_path ))
http_error(webblk, "404 File Not Found","",
"Invalid pathname");
// The following verifies the specified file does not lie
// outside the specified httproot (Note: sysblk.httproot
// was previously resolved to an absolute path by config.c)
if (strncmp( sysblk.httproot, resolved_path, strlen(sysblk.httproot)))
http_error(webblk, "404 File Not Found","",
"Invalid pathname");
}
static int http_authenticate(WEBBLK *webblk, char *type, char *userpass)
{
char *pointer ,*user, *passwd;
if (!strcasecmp(type,"Basic"))
{
if(userpass)
{
http_decode_base64(userpass);
/* the format is now user:password */
if ((pointer = strchr(userpass,':')))
{
*pointer = 0;
user = userpass;
passwd = pointer+1;
/* Hardcoded userid and password in configuration file */
if(sysblk.httpuser && sysblk.httppass)
{
if(!strcmp(user,sysblk.httpuser)
&& !strcmp(passwd,sysblk.httppass))
{
webblk->user = strdup(user);
return TRUE;
}
}
#if !defined(WIN32)
else
{
struct passwd *pass = NULL;
/* unix userid and password check, the userid
must be the same as that hercules is
currently running under */
// ZZ INCOMPLETE
// ZZ No password check is being performed yet...
if((pass = getpwnam(user))
&&
(pass->pw_uid == 0
|| pass->pw_uid == getuid()))
{
webblk->user = strdup(user);
return TRUE;
}
}
#endif /*!defined(WIN32)*/
}
}
}
webblk->user = NULL;
return FALSE;
}
static void http_download(WEBBLK *webblk, char *filename)
{
char buffer[HTTP_PATH_LENGTH];
char tbuf[80];
int fd, length;
char *filetype;
char fullname[HTTP_PATH_LENGTH];
struct stat st;
MIMETAB *mime_type = mime_types;
strlcpy( fullname, sysblk.httproot, sizeof(fullname) );
strlcat( fullname, filename, sizeof(fullname) );
http_verify_path(webblk,fullname);
if(stat(fullname,&st))
http_error(webblk, "404 File Not Found","",
strerror(errno));
if(!S_ISREG(st.st_mode))
http_error(webblk, "404 File Not Found","",
"The requested file is not a regular file");
fd = hopen(fullname,O_RDONLY|O_BINARY,0);
if (fd == -1)
http_error(webblk, "404 File Not Found","",
strerror(errno));
hprintf(webblk->sock,"HTTP/1.0 200 OK\n");
if ((filetype = strrchr(filename,'.')))
for(mime_type++;mime_type->suffix
&& strcasecmp(mime_type->suffix,filetype + 1);
mime_type++);
if(mime_type->type)
hprintf(webblk->sock,"Content-Type: %s\n", mime_type->type);
hprintf(webblk->sock,"Expires: %s\n",
http_timestring(tbuf,sizeof(tbuf),time(NULL)+HTML_STATIC_EXPIRY_TIME));
hprintf(webblk->sock,"Content-Length: %d\n\n", (int)st.st_size);
while ((length = read(fd, buffer, sizeof(buffer))) > 0)
hwrite(webblk->sock,buffer, length);
close(fd);
http_exit(webblk);
}
static void *http_request(int sock)
{
WEBBLK *webblk;
int authok = !sysblk.httpauth;
char line[HTTP_PATH_LENGTH];
char *url = NULL;
char *pointer;
char *strtok_str;
CGITAB *cgient;
int content_length = 0;
if(!(webblk = malloc(sizeof(WEBBLK))))
http_exit(webblk);
memset(webblk,0,sizeof(WEBBLK));
webblk->sock = sock;
while (hgets(line, sizeof(line), webblk->sock))
{
if (*line == '\r' || *line == '\n')
break;
if((pointer = strtok_r(line," \t\r\n",&strtok_str)))
{
if(!strcasecmp(pointer,"GET"))
{
if((pointer = strtok_r(NULL," \t\r\n",&strtok_str)))
{
webblk->request_type = REQTYPE_GET;
url = strdup(pointer);
}
}
else
if(!strcasecmp(pointer,"POST"))
{
if((pointer = strtok_r(NULL," \t\r\n",&strtok_str)))
{
webblk->request_type = REQTYPE_POST;
url = strdup(pointer);
}
}
else
if(!strcasecmp(pointer,"PUT"))
{
http_error(webblk,"400 Bad Request", "",
"This server does not accept PUT requests");
}
else
if(!strcasecmp(pointer,"Authorization:"))
{
if((pointer = strtok_r(NULL," \t\r\n",&strtok_str)))
authok = http_authenticate(webblk,pointer,
strtok_r(NULL," \t\r\n",&strtok_str));
}
else
if(!strcasecmp(pointer,"Cookie:"))
{
if((pointer = strtok_r(NULL,"\r\n",&strtok_str)))
http_interpret_variable_string(webblk, pointer, VARTYPE_COOKIE);
}
else
if(!strcasecmp(pointer,"Content-Length:"))
{
if((pointer = strtok_r(NULL," \t\r\n",&strtok_str)))
content_length = atoi(pointer);
}
}
}
webblk->request = url;
if(webblk->request_type == REQTYPE_POST
&& content_length != 0)
{
char *post_arg;
if((pointer = post_arg = malloc(content_length + 1)))
{
int i;
for(i = 0; i < content_length; i++)
{
*pointer = hgetc(webblk->sock);
if(*pointer != '\n' && *pointer != '\r')
pointer++;
}
*pointer = '\0';
http_interpret_variable_string(webblk, post_arg, VARTYPE_POST);
free(post_arg);
}
}
if (!authok)
http_error(webblk, "401 Authorization Required",
"WWW-Authenticate: Basic realm=\"HERCULES\"\n",
"You must be authenticated to use this service");
if (!url)
http_error(webblk,"400 Bad Request", "",
"You must specify a GET or POST request");
/* anything following a ? in the URL is part of the get arguments */
if ((pointer=strchr(url,'?'))) {
*pointer++ = 0;
http_interpret_variable_string(webblk, pointer, VARTYPE_GET);
}
while(url[0] == '/' && url[1] == '/')
url++;
webblk->baseurl = url;
if(!strcasecmp("/",url))
url = HTTP_WELCOME;
if(strncasecmp("/cgi-bin/",url,9))
http_download(webblk,url);
else
url += 9;
while(*url == '/')
url++;
#if 0
http_dump_cgi_variables(webblk);
#endif
for(cgient = cgidir; cgient->path; cgient++)
{
if(!strcmp(cgient->path, url))
{
char tbuf[80];
hprintf(webblk->sock,"HTTP/1.0 200 OK\nConnection: close\n");
hprintf(webblk->sock,"Date: %s\n",
http_timestring(tbuf,sizeof(tbuf),time(NULL)));
(cgient->cgibin) (webblk);
http_exit(webblk);
}
}
#if defined(OPTION_DYNAMIC_LOAD)
{
zz_cgibin dyncgi;
if( (dyncgi = HDL_FINDSYM(webblk->baseurl)) )
{
char tbuf[80];
hprintf(webblk->sock,"HTTP/1.0 200 OK\nConnection: close\n");
hprintf(webblk->sock,"Date: %s\n",
http_timestring(tbuf,sizeof(tbuf),time(NULL)));
dyncgi(webblk);
http_exit(webblk);
}
}
#endif /*defined(OPTION_DYNAMIC_LOAD)*/
http_error(webblk, "404 File Not Found","",
"The requested file was not found");
return NULL;
}
void *http_server (void *arg)
{
int rc; /* Return code */
int lsock; /* Socket for listening */
int csock; /* Socket for conversation */
struct sockaddr_in server; /* Server address structure */
fd_set selset; /* Read bit map for select */
int optval; /* Argument for setsockopt */
TID httptid; /* Negotiation thread id */
UNREFERENCED(arg);
/* Display thread started message on control panel */
logmsg (_("HHCHT001I HTTP listener thread started: "
"tid="TIDPAT", pid=%d\n"),
thread_id(), getpid());
/* If the HTTP root directory is not specified,
use a reasonable default */
if (!sysblk.httproot)
{
#if defined(_MSVC_)
char process_dir[HTTP_PATH_LENGTH];
if (get_process_directory(process_dir,HTTP_PATH_LENGTH) > 0)
{
strlcat(process_dir,"\\html",HTTP_PATH_LENGTH);
sysblk.httproot = strdup(process_dir);
}
else
#endif /*defined(WIN32)*/
sysblk.httproot = strdup(HTTP_ROOT);
}
/* Convert the specified HTTPROOT value to an absolute path
ending with a '/' and save in sysblk.httproot. */
{
char absolute_httproot_path[HTTP_PATH_LENGTH];
int rc;
#if defined(_MSVC_)
/* Expand any embedded %var% environ vars */
rc = expand_environ_vars( sysblk.httproot, absolute_httproot_path,
sizeof(absolute_httproot_path) );
if (rc == 0)
{
free(sysblk.httproot);
sysblk.httproot = strdup(absolute_httproot_path);
}
#endif /* defined(_MSVC_) */
/* Convert to absolute path */
if (!realpath(sysblk.httproot,absolute_httproot_path))
{
logmsg( _("HHCCF066E Invalid HTTPROOT: \"%s\": %s\n"),
sysblk.httproot, strerror(errno));
return NULL;
}
/* Verify that the absolute path is valid */
// mode: 0 = exist only, 2 = write, 4 = read, 6 = read/write
// rc: 0 = success, -1 = error (errno = cause)
// ENOENT = File name or path not found.
if (access( absolute_httproot_path, R_OK ) != 0)
{
logmsg( _("HHCCF066E Invalid HTTPROOT: \"%s\": %s\n"),
absolute_httproot_path, strerror(errno));
return NULL;
}
/* Append trailing [back]slash, but only if needed */
rc = strlen(absolute_httproot_path);
if (absolute_httproot_path[rc-1] != *HTTP_PS)
strlcat(absolute_httproot_path,HTTP_PS,sizeof(absolute_httproot_path));
/* Save the absolute path */
free(sysblk.httproot);
sysblk.httproot = strdup(absolute_httproot_path);
logmsg(_("HHCHT013I Using HTTPROOT directory \"%s\"\n"),sysblk.httproot);
}
/* Obtain a socket */
lsock = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (lsock < 0)
{
logmsg(_("HHCHT002E socket: %s\n"), strerror(HSO_errno));
return NULL;
}
/* Allow previous instance of socket to be reused */
optval = 1;
setsockopt (lsock, SOL_SOCKET, SO_REUSEADDR,
(void*)&optval, sizeof(optval));
/* Prepare the sockaddr structure for the bind */
memset (&server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = sysblk.httpport;
server.sin_port = htons(server.sin_port);
/* Attempt to bind the socket to the port */
while (TRUE)
{
rc = bind (lsock, (struct sockaddr *)&server, sizeof(server));
if (rc == 0 || HSO_errno != HSO_EADDRINUSE) break;
logmsg (_("HHCHT003W Waiting for port %u to become free\n"),
sysblk.httpport);
SLEEP(10);
} /* end while */
if (rc != 0)
{
logmsg(_("HHCHT004E bind: %s\n"), strerror(HSO_errno));
return NULL;
}
/* Put the socket into listening state */
rc = listen (lsock, 32);
if (rc < 0)
{
logmsg(_("HHCHT005E listen: %s\n"), strerror(HSO_errno));
return NULL;
}
logmsg(_("HHCHT006I Waiting for HTTP requests on port %u\n"),
sysblk.httpport);
/* Handle http requests */
while (sysblk.httpport) {
/* Initialize the select parameters */
FD_ZERO (&selset);
FD_SET (lsock, &selset);
/* Wait for a file descriptor to become ready */
rc = select ( lsock+1, &selset, NULL, NULL, NULL );
if (rc == 0) continue;
if (rc < 0 )
{
if (HSO_errno == HSO_EINTR) continue;
logmsg(_("HHCHT007E select: %s\n"), strerror(HSO_errno));
break;
}
/* If a http request has arrived then accept it */
if (FD_ISSET(lsock, &selset))
{
/* Accept the connection and create conversation socket */
csock = accept (lsock, NULL, NULL);
if (csock < 0)
{
logmsg(_("HHCHT008E accept: %s\n"), strerror(HSO_errno));
continue;
}
/* Create a thread to execute the http request */
if ( create_thread (&httptid, DETACHED,
http_request, (void *)(uintptr_t)csock,
"http_request")
)
{
logmsg(_("HHCHT010E http_request create_thread: %s\n"),
strerror(errno));
close_socket (csock);
}
} /* end if(lsock) */
} /* end while */
/* Close the listening socket */
close_socket (lsock);
/* Display thread started message on control panel */
logmsg (_("HHCHT009I HTTP listener thread ended: "
"tid="TIDPAT", pid=%d\n"),
thread_id(), getpid());
sysblk.httptid = 0;
return NULL;
} /* end function http_server */
#endif /*defined(OPTION_HTTP_SERVER)*/
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