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serve.c
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///////////////////////////////////////////////////////////////////////////////////////////////
/// This is free and unencumbered software released into the public domain. ///
/// ///
/// Anyone is free to copy, modify, publish, use, compile, sell, or ///
/// distribute this software, either in source code form or as a compiled ///
/// binary, for any purpose, commercial or non-commercial, and by any ///
/// means. ///
/// ///
/// In jurisdictions that recognize copyright laws, the author or authors ///
/// of this software dedicate any and all copyright interest in the ///
/// software to the public domain. We make this dedication for the benefit ///
/// of the public at large and to the detriment of our heirs and ///
/// successors. We intend this dedication to be an overt act of ///
/// relinquishment in perpetuity of all present and future rights to this ///
/// software under copyright law. ///
/// ///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, ///
/// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF ///
/// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. ///
/// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR ///
/// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ///
/// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR ///
/// OTHER DEALINGS IN THE SOFTWARE. ///
/// ///
/// For more information, please refer to <https://unlicense.org> ///
/// ///
/// NOTE: Some code was adapted from BearSSL. That code uses the MIT license. ///
///////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////
/// HEADERS ///
///////////////////////////////////////////////////////////////////////////////////////////////
#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stddef.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include <dirent.h>
#include <stdarg.h>
#include <limits.h>
#include <stdbool.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/resource.h>
#include <arpa/inet.h>
#include <poll.h>
#include <time.h>
///////////////////////////////////////////////////////////////////////////////////////////////
/// CONFIGURATION ///
///////////////////////////////////////////////////////////////////////////////////////////////
#ifndef HTTPS
#define HTTPS 0
#endif
#define BACKTRACE 1
#define BACKTRACE_FILE "backtrace.txt"
#define BACKTRACE_LIMIT 30
#define EOPALLOC 0
#define PROFILE 0
#define INPUT_BUFFER_LIMIT_MB 1
///////////////////////////////////////////////////////////////////////////////////////////////
/// OPTIONAL HEADERS ///
///////////////////////////////////////////////////////////////////////////////////////////////
#if HTTPS
#include <bearssl.h>
#endif
#if PROFILE
#include <x86intrin.h>
#endif
#if EOPALLOC
#include <sys/mman.h>
#endif
#if BACKTRACE
#include <dlfcn.h>
#include <execinfo.h>
#endif
///////////////////////////////////////////////////////////////////////////////////////////////
/// TYPES & DEFINITIONS ///
///////////////////////////////////////////////////////////////////////////////////////////////
typedef struct {
char *data;
size_t size;
} string;
#define LIT(S) ((string) {.data=(S), .size=sizeof(S)-1})
#define STR(S) ((string) {.data=(S), .size=strlen(S)})
#define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
#define SIZEOF(X) ((ssize_t) sizeof(X))
#define COUNTOF(X) (SIZEOF(X) / SIZEOF((X)[0]))
#define NULLSTR ((string) {.data=NULL, .size=0})
#ifndef NDEBUG
#define DEBUG(fmt, ...) write_format_to_stderr(fmt, ## __VA_ARGS__)
#else
#define DEBUG(...) {}
#endif
#if PROFILE
#define TIME(label) for (uint64_t start__ = __rdtsc(), done__ = 0; !done__; timing_result(__COUNTER__, __rdtsc() - start__, LIT(label)), (done__=1))
#else
#define TIME(...)
#endif
#if HTTPS
typedef struct {
int type; // BR_KEYTYPE_RSA or BR_KEYTYPE_EC
union {
br_rsa_private_key rsa;
br_ec_private_key ec;
};
} PrivateKey;
typedef struct {
br_x509_certificate *items;
int count;
int capacity;
} CertArray;
typedef struct {
int code;
string name;
string comment;
} BearSSLErrorInfo;
#endif
enum {
P_OK,
P_INCOMPLETE,
P_BADMETHOD,
P_BADVERSION,
P_BADHEADER,
};
enum {
T_CHUNKED = 1 << 0,
T_COMPRESS = 1 << 1,
T_DEFLATE = 1 << 2,
T_GZIP = 1 << 3,
};
typedef enum {
M_GET,
M_POST,
M_HEAD,
M_PUT,
M_DELETE,
M_CONNECT,
M_OPTIONS,
M_TRACE,
M_PATCH,
} Method;
#define MAX_HEADERS 32
typedef struct {
string name;
string value;
} Header;
typedef struct {
Method method;
string path;
int major;
int minor;
int nheaders;
Header headers[MAX_HEADERS];
string content;
} Request;
typedef struct {
char *data;
size_t head;
size_t size;
size_t capacity;
} ByteQueue;
typedef struct {
int fd;
ByteQueue input;
ByteQueue output;
uint32_t ipaddr;
int served_count;
bool https;
bool closing;
bool keep_alive;
uint64_t creation_time;
uint64_t start_time;
#if HTTPS
br_ssl_server_context https_context;
char https_buffer[BR_SSL_BUFSIZE_BIDI];
#endif
} Connection;
typedef enum {
R_STATUS,
R_HEADER,
R_CONTENT,
R_COMPLETE,
} ResponseBuilderState;
typedef struct {
ResponseBuilderState state;
Connection *conn;
bool failed;
bool keep_alive;
size_t content_length_offset;
size_t content_offset;
} ResponseBuilder;
///////////////////////////////////////////////////////////////////////////////////////////////
/// FORWARD DECLARATIONS ///
///////////////////////////////////////////////////////////////////////////////////////////////
void config_init(void);
void config_free(void);
bool config_load(string file);
uint32_t config_int(string name);
bool config_bool(string name);
string config_string(string name);
void log_init(string dir, size_t dir_limit_mb, size_t file_limit_b, size_t buffer_size);
void log_free(void);
void log_data(string str);
void log_fatal(string str);
void log_perror(string str);
void log_format(const char *fmt, ...);
void log_flush(void);
bool log_empty(void);
void byte_queue_init(ByteQueue *q);
void byte_queue_free(ByteQueue *q);
size_t byte_queue_size(ByteQueue *q);
bool byte_queue_ensure_min_free_space(ByteQueue *q, size_t num);
string byte_queue_start_write(ByteQueue *q);
void byte_queue_end_write(ByteQueue *q, size_t num);
string byte_queue_start_read(ByteQueue *q);
void byte_queue_end_read(ByteQueue *q, size_t num);
bool byte_queue_write(ByteQueue *q, string src);
void byte_queue_patch(ByteQueue *q, size_t offset, char *src, size_t len);
#if PROFILE
void timing_init(void);
void timing_result(int scope_index, uint64_t delta_cycles, string label);
void timing_print_results(void);
#endif
#if HTTPS
bool load_private_key_from_file(string file, PrivateKey *pkey);
void free_private_key(PrivateKey *pkey);
bool load_certs_from_file(string file, CertArray *array);
void free_certs(CertArray *array);
BearSSLErrorInfo get_bearssl_error_info(int code);
#endif
char to_lower(char c);
bool is_print(char c);
bool is_pcomp(char c);
bool is_digit(char c);
bool is_alpha(char c);
bool is_space(char c);
string trim(string s);
string substr(string str, size_t start, size_t end);
bool streq(string s1, string s2);
bool string_match_case_insensitive(string x, string y);
bool endswith(string suffix, string name);
bool startswith(string prefix, string str);
void print_bytes(string prefix, string str);
void *mymalloc(size_t num);
void myfree(void *ptr, size_t num);
uint64_t get_real_time_ms(void);
uint64_t get_monotonic_time_ms(void);
uint64_t get_monotonic_time_ns(void);
bool load_file_contents(string file, string *out);
bool set_blocking(int fd, bool blocking);
bool write_string_to_stderr(string s);
bool write_format_to_stderr(const char *fmt, ...);
bool write_format_to_stderr_va(const char *fmt, va_list args);
bool read_from_socket(int fd, ByteQueue *queue);
bool write_to_socket(int fd, ByteQueue *queue);
int create_listening_socket(string addr, int port);
void status_line(ResponseBuilder *b, int status);
void add_header(ResponseBuilder *b, string header);
void add_header_f(ResponseBuilder *b, const char *fmt, ...);
void append_content_s(ResponseBuilder *b, string str);
void append_content_f(ResponseBuilder *b, const char *fmt, ...);
string append_content_start(ResponseBuilder *b, size_t cap);
void append_content_end(ResponseBuilder *b, size_t num);
bool serve_file_or_dir(ResponseBuilder *b, string prefix, string docroot, string reqpath, string mime, bool enable_dir_listing);
///////////////////////////////////////////////////////////////////////////////////////////////
/// GLOBALS ///
///////////////////////////////////////////////////////////////////////////////////////////////
volatile sig_atomic_t stop = 0;
Connection *conns;
int num_conns = 0;
int max_conns = 0;
struct pollfd *pollarray;
uint64_t now;
uint64_t real_now;
int insecure_fd;
int secure_fd;
bool show_io;
bool show_requests;
bool access_log;
int keep_alive_max_requests;
int connection_timeout_sec;
int closing_timeout_sec;
int request_timeout_sec;
int log_flush_timeout_sec;
#if HTTPS
PrivateKey pkey;
CertArray certs;
#endif
///////////////////////////////////////////////////////////////////////////////////////////////
/// IMPLEMENTATION ///
///////////////////////////////////////////////////////////////////////////////////////////////
#if BACKTRACE
void crash_signal_handler(int signo)
{
string signame;
switch (signo) {
case SIGSEGV: signame = LIT("Segmentation fault"); break;
case SIGABRT: signame = LIT("Aborted"); break;
case SIGFPE: signame = LIT("Floating-point exception"); break;
case SIGILL: signame = LIT("Illegal instruction"); break;
default: signame = LIT("Unknown signal"); break;
}
void *stack_buf[BACKTRACE_LIMIT];
int num_stack = backtrace(stack_buf, COUNTOF(stack_buf));
char buffer[4096];
int used = snprintf(buffer, sizeof(buffer), "\n%.*s\nStack trace:\n", (int) signame.size, signame.data);
for (int i = 0; i < num_stack; i++) {
int n;
Dl_info info;
if (dladdr(stack_buf[i], &info) && info.dli_sname) {
n = snprintf(buffer + used, sizeof(buffer) - used, " #%d: %s (%p, %s)\n", i, info.dli_sname, info.dli_fbase, info.dli_fname);
} else {
n = snprintf(buffer + used, sizeof(buffer) - used, " #%d: ??? (%p)\n", i, stack_buf[i]);
}
used = MIN(COUNTOF(buffer)-1, used + n);
}
int fd = open(BACKTRACE_FILE, O_WRONLY | O_APPEND | O_CREAT, 0644);
if (fd < 0) return;
int cpy = 0;
while (cpy < used) {
int n = write(fd, buffer + cpy, used - cpy);
if (n < 0) return;
cpy += n;
}
close(fd);
signal(signo, SIG_DFL);
raise(signo);
}
#endif
void termination_signal_handler(int signo)
{
(void) signo;
stop = 1;
}
void init_globals(int argc, char **argv)
{
atexit(log_free);
string config_file = argc > 1 ? STR(argv[1]) : LIT("config.txt");
if (!config_load(config_file))
exit(-1);
access_log = config_bool(LIT("access_log"));
show_io = config_bool(LIT("show_io"));
show_requests = config_bool(LIT("show_requests"));
keep_alive_max_requests = config_int(LIT("keep_alive_max_requests"));
connection_timeout_sec = config_int(LIT("connection_timeout_sec"));
closing_timeout_sec = config_int(LIT("closing_timeout_sec"));
request_timeout_sec = config_int(LIT("request_timeout_sec"));
log_flush_timeout_sec = config_int(LIT("log_flush_timeout_sec"));
// Setup signal handlers
{
#if BACKTRACE
struct sigaction sa_crash;
sa_crash.sa_handler = crash_signal_handler;
sigemptyset(&sa_crash.sa_mask);
sa_crash.sa_flags = SA_RESTART | SA_NODEFER;
sigaction(SIGSEGV, &sa_crash, NULL);
sigaction(SIGABRT, &sa_crash, NULL);
sigaction(SIGFPE, &sa_crash, NULL);
sigaction(SIGILL, &sa_crash, NULL);
#endif
struct sigaction sa_term;
sa_term.sa_handler = termination_signal_handler;
sigemptyset(&sa_term.sa_mask);
sa_term.sa_flags = SA_RESTART;
sigaction(SIGTERM, &sa_term, NULL);
sigaction(SIGQUIT, &sa_term, NULL);
sigaction(SIGINT, &sa_term, NULL);
DEBUG("Signals configured\n");
}
// Setup logging
{
log_init(
config_string(LIT("log_dir_path")),
config_int(LIT("log_dir_limit_mb")),
config_int(LIT("log_file_limit_b")),
config_int(LIT("log_buff_size_b"))
);
log_data(LIT("starting\n"));
DEBUG("Logger configured\n");
}
#if PROFILE
timing_init();
#endif
// Setup connection arrays
{
struct rlimit file_desc_limit;
if (getrlimit(RLIMIT_NOFILE, &file_desc_limit))
log_fatal(LIT("Couldn't query RLIMIT_NOFILE\n"));
max_conns = config_int(LIT("max_connections"));
num_conns = 0;
if ((size_t) max_conns+2 > file_desc_limit.rlim_cur)
log_fatal(LIT("max_connections+2 is higher than the rlimit\n"));
conns = mymalloc(max_conns * sizeof(Connection));
if (conns == NULL)
log_fatal(LIT("Out of memory"));
for (int i = 0; i < max_conns; i++) {
conns[i].fd = -1;
byte_queue_init(&conns[i].input);
byte_queue_init(&conns[i].output);
}
pollarray = mymalloc((max_conns+2) * sizeof(struct pollfd));
if (pollarray == NULL)
log_fatal(LIT("Out of memory"));
DEBUG("Connection array created\n");
}
// Create plain text listener
{
string http_addr = config_string(LIT("http_addr"));
uint32_t http_port = config_int(LIT("http_port"));
insecure_fd = create_listening_socket(http_addr, http_port);
if (insecure_fd < 0)
log_fatal(LIT("Couldn't bind\n"));
log_format("Listening on %.*s:%d\n", (int) http_addr.size, http_addr.data, http_port);
DEBUG("HTTP started\n");
}
// Create secure listener
{
secure_fd = -1;
#if HTTPS
string https_addr = config_string(LIT("https_addr"));
uint32_t https_port = config_int(LIT("https_port"));
string https_cert_file = config_string(LIT("cert_file"));
string https_key_file = config_string(LIT("privkey_file"));
secure_fd = create_listening_socket(https_addr, https_port);
if (secure_fd < 0)
log_fatal(LIT("Couldn't bind\n"));
log_format("Listening on %.*s:%d\n", (int) https_addr.size, https_addr.data, https_port);
// Load certificate
if (!load_certs_from_file(https_cert_file, &certs))
log_fatal(LIT("Couldn't load certificates\n"));
DEBUG("Certificates loaded\n");
// Load private key
if (!load_private_key_from_file(https_key_file, &pkey))
log_fatal(LIT("Couldn't load private key\n"));
DEBUG("Private key loaded\n");
DEBUG("HTTPS started\n");
#endif
}
config_free();
}
void free_globals(void)
{
#if PROFILE
timing_print_results();
#endif
#if HTTPS
free_private_key(&pkey);
free_certs(&certs);
close(secure_fd);
#endif
close(insecure_fd);
for (int i = 0; i < max_conns; i++) {
if (conns[i].fd != -1) {
close(conns[i].fd);
byte_queue_free(&conns[i].input);
byte_queue_free(&conns[i].output);
}
}
myfree(conns, max_conns * sizeof(Connection));
myfree(pollarray, (max_conns+2) * sizeof(struct pollfd));
log_data(LIT("closing\n"));
log_free();
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// RESPONSE CALLBACK ///
///////////////////////////////////////////////////////////////////////////////////////////////
void respond(Request request, ResponseBuilder *b)
{
if (request.major != 1 || request.minor > 1) {
status_line(b, 505); // HTTP Version Not Supported
return;
}
if (request.method != M_GET) {
status_line(b, 405); // Method Not Allowed
return;
}
if (string_match_case_insensitive(request.path, LIT("/hello"))) {
status_line(b, 200);
append_content_s(b, LIT("Hello, world!"));
return;
}
if (serve_file_or_dir(b, LIT("/"), LIT("docroot/"), request.path, NULLSTR, false))
return;
status_line(b, 404);
append_content_s(b, LIT("Nothing here :|"));
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// REQUEST PARSER ///
///////////////////////////////////////////////////////////////////////////////////////////////
// TODO: Make sure every string in request is reasonaly long
int parse_request_head(string str, Request *request)
{
char *src = str.data;
size_t len = str.size;
size_t cur;
if (len > 2
&& src[0] == 'G'
&& src[1] == 'E'
&& src[2] == 'T') {
request->method = M_GET;
cur = 3;
} else if (len > 3
&& src[0] == 'H'
&& src[1] == 'E'
&& src[2] == 'A'
&& src[3] == 'D') {
request->method = M_HEAD;
cur = 4;
} else if (len > 3
&& src[0] == 'P'
&& src[1] == 'O'
&& src[2] == 'S'
&& src[3] == 'T') {
request->method = M_POST;
cur = 4;
} else if (len > 2
&& src[0] == 'P'
&& src[1] == 'U'
&& src[2] == 'T') {
request->method = M_PUT;
cur = 3;
} else if (len > 5
&& src[0] == 'D'
&& src[1] == 'E'
&& src[2] == 'L'
&& src[3] == 'E'
&& src[4] == 'T'
&& src[5] == 'E') {
request->method = M_DELETE;
cur = 6;
} else if (len > 6
&& src[0] == 'C'
&& src[1] == 'O'
&& src[2] == 'N'
&& src[3] == 'N'
&& src[4] == 'E'
&& src[5] == 'C'
&& src[6] == 'T') {
request->method = M_CONNECT;
cur = 7;
} else if (len > 6
&& src[0] == 'O'
&& src[1] == 'P'
&& src[2] == 'T'
&& src[3] == 'I'
&& src[4] == 'O'
&& src[5] == 'N'
&& src[6] == 'S') {
request->method = M_OPTIONS;
cur = 7;
} else if (len > 4
&& src[0] == 'T'
&& src[1] == 'R'
&& src[2] == 'A'
&& src[3] == 'C'
&& src[4] == 'E') {
request->method = M_TRACE;
cur = 5;
} else if (len > 4
&& src[0] == 'P'
&& src[1] == 'A'
&& src[2] == 'T'
&& src[3] == 'C'
&& src[4] == 'H') {
request->method = M_PATCH;
cur = 5;
} else {
return P_BADMETHOD;
}
if (cur == len || src[cur] != ' ')
return P_INCOMPLETE;
cur++;
// TODO: Make this more robust
{
size_t start = cur;
while (cur < len && src[cur] != ' ')
cur++;
request->path.data = src + start;
request->path.size = cur - start;
}
if (cur == len || src[cur] != ' ')
return P_INCOMPLETE;
cur++;
if (cur+4 >= len
|| src[cur+0] != 'H'
|| src[cur+1] != 'T'
|| src[cur+2] != 'T'
|| src[cur+3] != 'P'
|| src[cur+4] != '/'
|| !is_digit(src[cur+5]))
return P_BADVERSION;
cur += 5;
request->major = src[cur] - '0';
cur++;
if (cur < len && src[cur] == '.') {
cur++;
if (cur == len || !is_digit(src[cur]))
return P_BADVERSION;
request->minor = src[cur] - '0';
cur++;
} else {
request->minor = 0;
}
if (cur+1 >= len
|| src[cur+0] != '\r'
|| src[cur+1] != '\n')
return P_INCOMPLETE;
cur += 2;
request->nheaders = 0;
while (cur+1 >= len
|| src[cur+0] != '\r'
|| src[cur+1] != '\n') {
string name;
string value;
size_t start = cur;
// TODO: More robust
while (cur < len && src[cur] != ':')
cur++;
name.data = src + start;
name.size = cur - start;
if (cur == len)
return P_BADHEADER;
cur++; // :
// TODO: More robust
start = cur;
while (cur < len && src[cur] != '\r')
cur++;
value.data = src + start;
value.size = cur - start;
cur++; // \r
if (cur == len || src[cur] != '\n')
return P_BADHEADER;
cur++; // \n
if (request->nheaders < MAX_HEADERS) {
request->headers[request->nheaders].name = name;
request->headers[request->nheaders].value = value;
request->nheaders++;
}
}
// cur here points to the \r in \r\n
return P_OK;
}
bool find_header(Request *request, string name, string *value)
{
for (int i = 0; i < request->nheaders; i++)
if (string_match_case_insensitive(request->headers[i].name, name)) {
*value = request->headers[i].value;
return true;
}
return false;
}
string get_status_string(int status)
{
switch(status)
{
case 100: return LIT("Continue");
case 101: return LIT("Switching Protocols");
case 102: return LIT("Processing");
case 200: return LIT("OK");
case 201: return LIT("Created");
case 202: return LIT("Accepted");
case 203: return LIT("Non-Authoritative Information");
case 204: return LIT("No Content");
case 205: return LIT("Reset Content");
case 206: return LIT("Partial Content");
case 207: return LIT("Multi-Status");
case 208: return LIT("Already Reported");
case 300: return LIT("Multiple Choices");
case 301: return LIT("Moved Permanently");
case 302: return LIT("Found");
case 303: return LIT("See Other");
case 304: return LIT("Not Modified");
case 305: return LIT("Use Proxy");
case 306: return LIT("Switch Proxy");
case 307: return LIT("Temporary Redirect");
case 308: return LIT("Permanent Redirect");
case 400: return LIT("Bad Request");
case 401: return LIT("Unauthorized");
case 402: return LIT("Payment Required");
case 403: return LIT("Forbidden");
case 404: return LIT("Not Found");
case 405: return LIT("Method Not Allowed");
case 406: return LIT("Not Acceptable");
case 407: return LIT("Proxy Authentication Required");
case 408: return LIT("Request Timeout");
case 409: return LIT("Conflict");
case 410: return LIT("Gone");
case 411: return LIT("Length Required");
case 412: return LIT("Precondition Failed");
case 413: return LIT("Request Entity Too Large");
case 414: return LIT("Request-URI Too Long");
case 415: return LIT("Unsupported Media Type");
case 416: return LIT("Requested Range Not Satisfiable");
case 417: return LIT("Expectation Failed");
case 418: return LIT("I'm a teapot");
case 420: return LIT("Enhance your calm");
case 422: return LIT("Unprocessable Entity");
case 426: return LIT("Upgrade Required");
case 429: return LIT("Too many requests");
case 431: return LIT("Request Header Fields Too Large");
case 449: return LIT("Retry With");
case 451: return LIT("Unavailable For Legal Reasons");
case 500: return LIT("Internal Server Error");
case 501: return LIT("Not Implemented");
case 502: return LIT("Bad Gateway");
case 503: return LIT("Service Unavailable");
case 504: return LIT("Gateway Timeout");
case 505: return LIT("HTTP Version Not Supported");
case 509: return LIT("Bandwidth Limit Exceeded");
}
return LIT("???");
}
size_t parse_content_length(string s)
{
char *src = s.data;
size_t len = s.size;
size_t cur = 0;
while (cur < len && is_space(src[cur]))
cur++;
if (cur == len || !is_digit(src[cur]))
return -1;
size_t x = 0;
do {
int d = src[cur] - '0';
if (x > (SIZE_MAX - d) / 10)
return -1;
x = x * 10 + d;
cur++;
} while (cur < len && is_digit(src[cur]));
while (cur < len && is_space(src[cur]))
cur++;
if (cur != len)
return -1;
return x;
}
int find_and_parse_transfer_encoding(Request *request)
{
string value;
if (!find_header(request, LIT("Transfer-Encoding"), &value))
return 0;
int res = 0;
char *src = value.data;
size_t len = value.size;
size_t cur = 0;
for (;;) {
while (cur < len && (is_space(src[cur]) || src[cur] == ','))
cur++;
if (cur+6 < len
&& src[cur+0] == 'c'
&& src[cur+1] == 'h'
&& src[cur+2] == 'u'
&& src[cur+3] == 'n'
&& src[cur+4] == 'k'
&& src[cur+5] == 'e'
&& src[cur+6] == 'd') {
cur += 7;
res |= T_CHUNKED;
} else if (cur+7 < len
&& src[cur+0] == 'c'
&& src[cur+1] == 'o'
&& src[cur+2] == 'm'
&& src[cur+3] == 'p'
&& src[cur+4] == 'r'
&& src[cur+5] == 'e'
&& src[cur+6] == 's'
&& src[cur+7] == 's') {
cur += 8;
res |= T_COMPRESS;
} else if (cur+6 < len
&& src[cur+0] == 'd'
&& src[cur+1] == 'e'
&& src[cur+2] == 'f'
&& src[cur+3] == 'l'
&& src[cur+4] == 'a'
&& src[cur+5] == 't'
&& src[cur+6] == 'e') {
cur += 7;
res |= T_DEFLATE;
} else if (cur+3 < len
&& src[cur+0] == 'g'
&& src[cur+1] == 'z'
&& src[cur+2] == 'i'
&& src[cur+3] == 'p') {
cur += 4;
res |= T_GZIP;
} else {
return -1;
}
}
return res;
}
void response_builder_init(ResponseBuilder *b, Connection *conn)
{
b->state = R_STATUS;
b->conn = conn;
b->failed = false;
b->keep_alive = true;
b->content_length_offset = -1;
b->content_offset = -1;
}
void status_line(ResponseBuilder *b, int status)
{
if (b->state != R_STATUS)
log_fatal(LIT("Appending status line twice\n"));
if (!b->failed) {
char buf[1<<10];
string status_string = get_status_string(status);
int num = snprintf(buf, sizeof(buf), "HTTP/1.1 %d %.*s\r\n", status, (int) status_string.size, status_string.data);
assert(num > 0 && num < SIZEOF(buf));
if (!byte_queue_write(&b->conn->output, (string) {buf, num}))
b->failed = true;
}
b->state = R_HEADER;
}
void add_header(ResponseBuilder *b, string header)
{
if (b->state != R_HEADER) {
if (b->state == R_STATUS)
log_fatal(LIT("Didn't write status line before headers\n"));
else
log_fatal(LIT("Can't add headers after content\n"));
}
if (b->failed)
return;
if (!byte_queue_write(&b->conn->output, header) ||
!byte_queue_write(&b->conn->output, LIT("\r\n"))) {
b->failed = true;
return;
}
}
void add_header_f(ResponseBuilder *b, const char *fmt, ...)
{
char buffer[1<<10];
va_list args;
va_start(args, fmt);
int num = vsnprintf(buffer, sizeof(buffer), fmt, args);
va_end(args);
if (num < 0 || num >= (int) sizeof(buffer)) {
b->failed = true;
return;
}
buffer[num] = '\0';
add_header(b, (string) {buffer, num});
}
bool should_keep_alive(Connection *conn);
void append_special_headers(ResponseBuilder *b)
{
if (should_keep_alive(b->conn))
add_header(b, LIT("Connection: Keep-Alive"));
else {
add_header(b, LIT("Connection: Close"));
b->conn->closing = true;
b->conn->start_time = now;
}
b->content_length_offset = byte_queue_size(&b->conn->output) + sizeof("Content-Length: ") - 1;
add_header(b, LIT("Content-Length: "));