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FastCGI working buggy

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Lorenz Stechauner
2020-12-27 18:33:50 +01:00
parent 1429961e44
commit 885ec2226f
7 changed files with 641 additions and 30 deletions
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436
src/fastcgi.c
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@ -1,8 +1,442 @@
/**
* Necronda Web Server
* FastCGI implementation
* FastCGI interface implementation
* src/fastcgi.c
* Lorenz Stechauner, 2020-12-26
*/
#include "fastcgi.h"
#include "necronda-server.h"
#include <sys/un.h>
char *fastcgi_add_param(char *buf, const char *key, const char *value) {
char *ptr = buf;
unsigned long key_len = strlen(key);
unsigned long val_len = strlen(value);
if (key_len <= 127) {
ptr[0] = (char) (key_len & 0x7F);
ptr++;
} else {
ptr[0] = (char) (0x80 | (key_len >> 24));
ptr[1] = (char) ((key_len >> 16) & 0xFF);
ptr[2] = (char) ((key_len >> 8) & 0xFF);
ptr[3] = (char) (key_len & 0xFF);
ptr += 4;
}
if (val_len <= 127) {
ptr[0] = (char) (val_len & 0x7F);
ptr++;
} else {
ptr[0] = (char) (0x80 | (val_len >> 24));
ptr[1] = (char) ((val_len >> 16) & 0xFF);
ptr[2] = (char) ((val_len >> 8) & 0xFF);
ptr[3] = (char) (val_len & 0xFF);
ptr += 4;
}
memcpy(ptr, key, key_len);
ptr += key_len;
memcpy(ptr, value, val_len);
ptr += val_len;
return ptr;
}
int fastcgi_init(fastcgi_conn *conn, unsigned int client_num, unsigned int req_num, const sock *client,
const http_req *req, const http_uri *uri) {
unsigned short req_id = (client_num & 0xFFF) << 4;
if (client_num == 0) {
req_id |= (req_num + 1) & 0xF;
} else {
req_id |= req_num & 0xF;
}
conn->req_id = req_id;
conn->out_buf = NULL;
conn->out_off = 0;
int php_fpm = socket(AF_UNIX, SOCK_STREAM, 0);
if (php_fpm < 0) {
fprintf(stderr, ERR_STR "Unable to create unix socket: %s" CLR_STR "\n", strerror(errno));
return -1;
}
conn->socket = php_fpm;
struct sockaddr_un php_fpm_addr = {AF_UNIX, PHP_FPM_SOCKET};
if (connect(conn->socket, (struct sockaddr *) &php_fpm_addr, sizeof(php_fpm_addr)) < 0) {
fprintf(stderr, ERR_STR "Unable to connect to unix socket of PHP-FPM: %s" CLR_STR "\n", strerror(errno));
return -1;
}
FCGI_Header header = {
.version = FCGI_VERSION_1,
.requestIdB1 = req_id >> 8,
.requestIdB0 = req_id & 0xFF,
.paddingLength = 0,
.reserved = 0
};
header.type = FCGI_BEGIN_REQUEST;
header.contentLengthB1 = 0;
header.contentLengthB0 = sizeof(FCGI_BeginRequestBody);
FCGI_BeginRequestRecord begin = {
header,
{.roleB1 = (FCGI_RESPONDER >> 8) & 0xFF, .roleB0 = FCGI_RESPONDER & 0xFF, .flags = 0}
};
if (send(conn->socket, &begin, sizeof(begin), 0) != sizeof(begin)) {
fprintf(stderr, ERR_STR "Unable to send to PHP-FPM: %s" CLR_STR "\n", strerror(errno));
return -2;
}
char param_buf[4096];
char buf0[256];
char *param_ptr = param_buf + sizeof(header);
param_ptr = fastcgi_add_param(param_ptr, "REDIRECT_STATUS", "CGI");
param_ptr = fastcgi_add_param(param_ptr, "DOCUMENT_ROOT", uri->webroot);
param_ptr = fastcgi_add_param(param_ptr, "GATEWAY_INTERFACE", "CGI/1.1");
param_ptr = fastcgi_add_param(param_ptr, "SERVER_SOFTWARE", SERVER_STR);
param_ptr = fastcgi_add_param(param_ptr, "SERVER_PROTOCOL", "HTTP/1.1");
param_ptr = fastcgi_add_param(param_ptr, "SERVER_NAME", http_get_header_field(&req->hdr, "Host", HTTP_LOWER));
if (client->enc) {
param_ptr = fastcgi_add_param(param_ptr, "HTTPS", "on");
}
struct sockaddr_storage addr_storage;
struct sockaddr_in6 *addr;
socklen_t len = sizeof(addr_storage);
getsockname(client->socket, (struct sockaddr *) &addr_storage, &len);
addr = (struct sockaddr_in6 *) &addr_storage;
sprintf(buf0, "%i", addr->sin6_port);
param_ptr = fastcgi_add_param(param_ptr, "SERVER_PORT", buf0);
len = sizeof(addr_storage);
getpeername(client->socket, (struct sockaddr *) &addr_storage, &len);
addr = (struct sockaddr_in6 *) &addr_storage;
sprintf(buf0, "%i", addr->sin6_port);
param_ptr = fastcgi_add_param(param_ptr, "REMOTE_PORT", buf0);
char addr_str[INET6_ADDRSTRLEN];
char *addr_ptr;
inet_ntop(addr->sin6_family, (void *) &addr->sin6_addr, addr_str, INET6_ADDRSTRLEN);
if (strncmp(addr_str, "::ffff:", 7) == 0) {
addr_ptr = addr_str + 7;
} else {
addr_ptr = addr_str;
}
param_ptr = fastcgi_add_param(param_ptr, "REMOTE_ADDR", addr_ptr);
param_ptr = fastcgi_add_param(param_ptr, "REMOTE_HOST", addr_ptr);
//param_ptr = fastcgi_add_param(param_ptr, "REMOTE_IDENT", "");
//param_ptr = fastcgi_add_param(param_ptr, "REMOTE_USER", "");
param_ptr = fastcgi_add_param(param_ptr, "REQUEST_METHOD", req->method);
param_ptr = fastcgi_add_param(param_ptr, "REQUEST_URI", req->uri);
param_ptr = fastcgi_add_param(param_ptr, "SCRIPT_NAME", uri->filename + strlen(uri->webroot));
param_ptr = fastcgi_add_param(param_ptr, "SCRIPT_FILENAME", uri->filename);
//param_ptr = fastcgi_add_param(param_ptr, "PATH_TRANSLATED", uri->filename);
param_ptr = fastcgi_add_param(param_ptr, "QUERY_STRING", uri->query != NULL ? uri->query : "");
if (uri->pathinfo != NULL && strlen(uri->pathinfo) > 0) {
sprintf(buf0, "/%s", uri->pathinfo);
} else {
sprintf(buf0, "");
}
param_ptr = fastcgi_add_param(param_ptr, "PATH_INFO", buf0);
//param_ptr = fastcgi_add_param(param_ptr, "AUTH_TYPE", "");
char *content_length = http_get_header_field(&req->hdr, "Content-Length", HTTP_LOWER);
param_ptr = fastcgi_add_param(param_ptr, "CONTENT_LENGTH", content_length != NULL ? content_length : "");
char *content_type = http_get_header_field(&req->hdr, "Content-Type", HTTP_LOWER);
param_ptr = fastcgi_add_param(param_ptr, "CONTENT_TYPE", content_type != NULL ? content_type : "");
for (int i = 0; i < req->hdr.field_num; i++) {
char *ptr = buf0;
ptr += sprintf(ptr, "HTTP_");
for (int j = 0; j < strlen(req->hdr.fields[i][0]); j++, ptr++) {
char ch = req->hdr.fields[i][0][j];
if ((ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9')) {
ch = ch;
} else if (ch >= 'a' && ch <= 'z') {
ch &= 0x5F;
} else {
ch = '_';
}
ptr[0] = ch;
ptr[1] = 0;
}
param_ptr = fastcgi_add_param(param_ptr, buf0, req->hdr.fields[i][1]);
}
unsigned short param_len = param_ptr - param_buf - sizeof(header);
header.type = FCGI_PARAMS;
header.contentLengthB1 = param_len >> 8;
header.contentLengthB0 = param_len & 0xFF;
memcpy(param_buf, &header, sizeof(header));
if (send(conn->socket, param_buf, param_len + sizeof(header), 0) != param_len + sizeof(header)) {
fprintf(stderr, ERR_STR "Unable to send to PHP-FPM: %s" CLR_STR "\n", strerror(errno));
return -2;
}
FILE *f = fopen("/home/lorenz/Desktop/test.dmp", "wb");
fwrite(param_buf, 1, param_len, f);
fclose(f);
header.type = FCGI_PARAMS;
header.contentLengthB1 = 0;
header.contentLengthB0 = 0;
if (send(conn->socket, &header, sizeof(header), 0) != sizeof(header)) {
fprintf(stderr, ERR_STR "Unable to send to PHP-FPM: %s" CLR_STR "\n", strerror(errno));
return -2;
}
return 0;
}
int fastcgi_close_stdin(fastcgi_conn *conn) {
FCGI_Header header = {
.version = FCGI_VERSION_1,
.type = FCGI_STDIN,
.requestIdB1 = conn->req_id >> 8,
.requestIdB0 = conn->req_id & 0xFF,
.contentLengthB1 = 0,
.contentLengthB0 = 0,
.paddingLength = 0,
.reserved = 0
};
if (send(conn->socket, &header, sizeof(header), 0) != sizeof(header)) {
fprintf(stderr, ERR_STR "Unable to send to PHP-FPM: %s" CLR_STR "\n", strerror(errno));
return -2;
}
return 0;
}
int fastcgi_php_error(char *msg, int msg_len, char *err_msg) {
char *msg_str = malloc(msg_len + 1);
char *ptr0 = msg_str;
strncpy(msg_str, msg, msg_len);
char *ptr1 = NULL;
int len;
int err = 0;
while (1) {
ptr1 = strstr(ptr0, "PHP message: ");
if (ptr1 == NULL) {
len = (int) (msg_len - (ptr0 - msg_str));
} else {
len = (int) (ptr1 - ptr0);
}
if (len == 0) {
goto next;
}
int msg_type = 0;
int msg_pre_len = 0;
if (len >= 14 && strncmp(ptr0, "PHP Warning: ", 14) == 0) {
msg_type = 1;
msg_pre_len = 14;
} else if (len >= 18 && strncmp(ptr0, "PHP Fatal error: ", 18) == 0) {
msg_type = 2;
msg_pre_len = 18;
} else if (len >= 18 && strncmp(ptr0, "PHP Parse error: ", 18) == 0) {
msg_type = 2;
msg_pre_len = 18;
} else if (len >= 18 && strncmp(ptr0, "PHP Notice: ", 13) == 0) {
msg_type = 1;
msg_pre_len = 13;
}
char *ptr2 = ptr0;
char *ptr3;
int len2;
while (ptr2 - ptr0 < len) {
ptr3 = strchr(ptr2, '\n');
len2 = (int) (len - (ptr2 - ptr0));
if (ptr3 != NULL && (ptr3 - ptr2) < len2) {
len2 = (int) (ptr3 - ptr2);
}
print("%s%.*s%s", msg_type == 1 ? WRN_STR : msg_type == 2 ? ERR_STR: "", len2, ptr2, msg_type != 0 ? CLR_STR : "");
if (msg_type == 2 && ptr2 == ptr0) {
sprintf(err_msg, "%.*s", len2, ptr2);
err = 1;
}
if (ptr3 == NULL) {
break;
}
ptr2 = ptr3 + 1;
}
next:
if (ptr1 == NULL) {
break;
}
ptr0 = ptr1 + 13;
}
return err;
}
int fastcgi_header(fastcgi_conn *conn, http_res *res, char *err_msg) {
FCGI_Header header;
char *content;
unsigned short content_len, req_id;
int ret;
int err = 0;
while (1) {
ret = recv(conn->socket, &header, sizeof(header), 0);
if (ret < 0) {
res->status = http_get_status(502);
sprintf(err_msg, "Unable to communicate with PHP-FPM.");
fprintf(stderr, ERR_STR "Unable to receive from PHP-FPM: %s" CLR_STR "\n", strerror(errno));
return -1;
} else if (ret != sizeof(header)) {
res->status = http_get_status(502);
sprintf(err_msg, "Unable to communicate with PHP-FPM.");
fprintf(stderr, ERR_STR "Unable to receive from PHP-FPM" CLR_STR "\n");
return -1;
}
req_id = (header.requestIdB1 << 8) | header.requestIdB0;
content_len = (header.contentLengthB1 << 8) | header.contentLengthB0;
content = malloc(content_len + header.paddingLength);
ret = recv(conn->socket, content, content_len + header.paddingLength, 0);
if (ret < 0) {
res->status = http_get_status(502);
sprintf(err_msg, "Unable to communicate with PHP-FPM.");
fprintf(stderr, ERR_STR "Unable to receive from PHP-FPM: %s" CLR_STR "\n", strerror(errno));
free(content);
return -1;
} else if (ret != (content_len + header.paddingLength)) {
res->status = http_get_status(502);
sprintf(err_msg, "Unable to communicate with PHP-FPM.");
fprintf(stderr, ERR_STR "Unable to receive from PHP-FPM" CLR_STR "\n");
free(content);
return -1;
}
if (req_id != conn->req_id) {
continue;
}
if (header.type == FCGI_END_REQUEST) {
FCGI_EndRequestBody *body = (FCGI_EndRequestBody *) content;
int app_status = (body->appStatusB3 << 24) | (body->appStatusB2 << 16) | (body->appStatusB1 << 8) |
body->appStatusB0;
if (body->protocolStatus != FCGI_REQUEST_COMPLETE) {
print(ERR_STR "FastCGI protocol error: %i" CLR_STR, body->protocolStatus);
}
if (app_status != 0) {
print(ERR_STR "Script terminated with exit code %i" CLR_STR, app_status);
}
close(conn->socket);
conn->socket = 0;
free(content);
return -2;
} else if (header.type == FCGI_STDERR) {
err = err || fastcgi_php_error(content, content_len, err_msg);
} else if (header.type == FCGI_STDOUT) {
break;
} else {
fprintf(stderr, ERR_STR "Unknown FastCGI type: %i" CLR_STR "\n", header.type);
}
free(content);
}
if (err) {
res->status = http_get_status(500);
return -3;
}
conn->out_buf = content;
conn->out_len = content_len;
conn->out_off = (unsigned short) (strstr(content, "\r\n\r\n") - content + 4);
// TODO process headers and add fields to res
return 0;
}
int fastcgi_send(fastcgi_conn *conn, sock *client, int flags) {
FCGI_Header header;
int ret;
char buf0[256];
int len;
char *content, *ptr;
unsigned short req_id, content_len;
if (conn->out_buf != NULL && conn->out_len > conn->out_off) {
content = conn->out_buf;
ptr = content + conn->out_off;
content_len = conn->out_len - conn->out_off;
goto out;
}
while (1) {
ret = recv(conn->socket, &header, sizeof(header), 0);
if (ret < 0) {
fprintf(stderr, ERR_STR "Unable to receive from PHP-FPM: %s" CLR_STR "\n", strerror(errno));
return -1;
} else if (ret != sizeof(header)) {
fprintf(stderr, ERR_STR "Unable to receive from PHP-FPM" CLR_STR "\n");
return -1;
}
req_id = (header.requestIdB1 << 8) | header.requestIdB0;
content_len = (header.contentLengthB1 << 8) | header.contentLengthB0;
content = malloc(content_len + header.paddingLength);
ptr = content;
ret = recv(conn->socket, content, content_len + header.paddingLength, 0);
if (ret < 0) {
fprintf(stderr, ERR_STR "Unable to receive from PHP-FPM: %s" CLR_STR "\n", strerror(errno));
free(content);
return -1;
} else if (ret != (content_len + header.paddingLength)) {
fprintf(stderr, ERR_STR "Unable to receive from PHP-FPM" CLR_STR "\n");
free(content);
return -1;
}
if (header.type == FCGI_END_REQUEST) {
FCGI_EndRequestBody *body = (FCGI_EndRequestBody *) content;
int app_status = (body->appStatusB3 << 24) | (body->appStatusB2 << 16) | (body->appStatusB1 << 8) |
body->appStatusB0;
if (body->protocolStatus != FCGI_REQUEST_COMPLETE) {
print(ERR_STR "FastCGI protocol error: %i" CLR_STR, body->protocolStatus);
}
if (app_status != 0) {
print(ERR_STR "Script terminated with exit code %i" CLR_STR, app_status);
}
close(conn->socket);
conn->socket = 0;
free(content);
if (flags & FASTCGI_CHUNKED) {
if (client->enc) {
SSL_write(client->ssl, "0\r\n\r\n", 5);
} else {
send(client->socket, "0\r\n\r\n", 5, 0);
}
}
return 0;
} else if (header.type == FCGI_STDERR) {
print(ERR_STR "%.*s" CLR_STR, content_len, content);
} else if (header.type == FCGI_STDOUT) {
out:
len = sprintf(buf0, "%X\r\n", content_len);
if (client->enc) {
if (flags & FASTCGI_CHUNKED) SSL_write(client->ssl, buf0, len);
SSL_write(client->ssl, ptr, content_len);
if (flags & FASTCGI_CHUNKED) SSL_write(client->ssl, "\r\n", 2);
} else {
if (flags & FASTCGI_CHUNKED) send(client->socket, buf0, len, 0);
send(client->socket, ptr, content_len, 0);
if (flags & FASTCGI_CHUNKED) send(client->socket, "\r\n", 2, 0);
}
} else {
fprintf(stderr, ERR_STR "Unknown FastCGI type: %i" CLR_STR "\n", header.type);
}
free(content);
}
}