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handlers.c
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handlers.c
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/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file. */
#include "handlers.h"
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include "include/nacl_io/osdirent.h"
#include "include/nacl_io/osinttypes.h"
#include "nacl_io_demo.h"
#define MAX_OPEN_FILES 10
#define MAX_OPEN_DIRS 10
#define MAX_PARAMS 4
#if defined(WIN32)
#define stat _stat
#endif
#ifdef __PNACL
void PostMessage(const char* format, ...);
#define printf PostMessage
#endif
/**
* A mapping from int -> FILE*, so the JavaScript messages can refer to an open
* File.
*/
static FILE* g_OpenFiles[MAX_OPEN_FILES];
/**
* A mapping from int -> DIR*, so the JavaScript messages can refer to an open
* Directory.
*/
static void* g_OpenDirs[MAX_OPEN_DIRS];
/**
* A collection of the most recently allocated parameter strings. This makes
* the Handle* functions below easier to write because they don't have to
* manually deallocate the strings they're using.
*/
static char* g_ParamStrings[MAX_PARAMS];
/**
* Add |object| to |map| and return the index it was added at.
* @param[in] map The map to add the object to.
* @param[in] max_map_size The maximum map size.
* @param[in] object The object to add to the map.
* @return int The index of the added object, or -1 if there is no more space.
*/
static int AddToMap(void** map, int max_map_size, void* object) {
int i;
assert(object != NULL);
for (i = 0; i < max_map_size; ++i) {
if (map[i] == NULL) {
map[i] = object;
return i;
}
}
return -1;
}
/**
* Remove an object at index |i| from |map|.
* @param[in] map The map to remove from.
* @param[in] max_map_size The size of the map.
* @param[in] i The index to remove.
*/
static void RemoveFromMap(void** map, int max_map_size, int i) {
assert(i >= 0 && i < max_map_size);
map[i] = NULL;
}
/**
* Add the file to the g_OpenFiles map.
* @param[in] file The file to add to g_OpenFiles.
* @return int The index of the FILE in g_OpenFiles, or -1 if there are too many
* open files.
*/
static int AddFileToMap(FILE* file) {
return AddToMap((void**)g_OpenFiles, MAX_OPEN_FILES, file);
}
/**
* Remove the file from the g_OpenFiles map.
* @param[in] i The index of the file handle to remove.
*/
static void RemoveFileFromMap(int i) {
RemoveFromMap((void**)g_OpenFiles, MAX_OPEN_FILES, i);
}
/* Win32 doesn't support DIR/opendir/readdir/closedir. */
#if !defined(WIN32)
/**
* Add the dir to the g_OpenDirs map.
* @param[in] dir The dir to add to g_OpenDirs.
* @return int The index of the DIR in g_OpenDirs, or -1 if there are too many
* open dirs.
*/
static int AddDirToMap(DIR* dir) {
return AddToMap((void**)g_OpenDirs, MAX_OPEN_DIRS, dir);
}
/**
* Remove the dir from the g_OpenDirs map.
* @param[in] i The index of the dir handle to remove.
*/
static void RemoveDirFromMap(int i) {
RemoveFromMap((void**)g_OpenDirs, MAX_OPEN_DIRS, i);
}
#endif
/**
* Get the number of parameters.
* @param[in] params The parameter array.
* @return uint32_t The number of parameters in the array.
*/
static uint32_t GetNumParams(struct PP_Var params) {
return g_ppb_var_array->GetLength(params);
}
/**
* Get a parameter at |index| as a string.
* @param[in] params The parameter array.
* @param[in] index The index in |params| to get.
* @param[out] out_string The output string.
* @param[out] out_string_len The length of the output string.
* @param[out] out_error An error message, if this operation failed.
* @return int 0 if successful, otherwise 1.
*/
static int GetParamString(struct PP_Var params,
uint32_t index,
char** out_string,
uint32_t* out_string_len,
const char** out_error) {
if (index >= MAX_PARAMS) {
*out_error = PrintfToNewString("Param index %u >= MAX_PARAMS (%d)",
index, MAX_PARAMS);
return 1;
}
struct PP_Var value = g_ppb_var_array->Get(params, index);
if (value.type != PP_VARTYPE_STRING) {
*out_error =
PrintfToNewString("Expected param at index %d to be a string not.%d", index,value.type);
return 1;
}
uint32_t length;
const char* var_str = g_ppb_var->VarToUtf8(value, &length);
char* string = (char*)malloc(length + 1);
memcpy(string, var_str, length);
string[length] = 0;
/* Put the allocated string in g_ParamStrings. This keeps us from leaking
* each parameter string, without having to do manual cleanup in every
* Handle* function below.
*/
free(g_ParamStrings[index]);
g_ParamStrings[index] = string;
*out_string = string;
*out_string_len = length;
return 0;
}
/**
* Get a parameter at |index| as a FILE*.
* @param[in] params The parameter array.
* @param[in] index The index in |params| to get.
* @param[out] out_file The output FILE*.
* @param[out] out_file_index The index of the output FILE* in g_OpenFiles.
* @param[out] out_error An error message, if this operation failed.
* @return int 0 if successful, otherwise 1.
*/
static int GetParamFile(struct PP_Var params,
uint32_t index,
FILE** out_file,
int32_t* out_file_index,
const char** out_error) {
struct PP_Var value = g_ppb_var_array->Get(params, index);
if (value.type != PP_VARTYPE_INT32) {
*out_error =
PrintfToNewString("Expected param at index %d to be an int32", index);
return 1;
}
int32_t file_index = value.value.as_int;
if (file_index < 0 || file_index >= MAX_OPEN_FILES) {
*out_error = PrintfToNewString("File index %d is out range", file_index);
return 1;
}
if (g_OpenFiles[file_index] == NULL) {
*out_error = PrintfToNewString("File index %d is not open", file_index);
return 1;
}
*out_file = g_OpenFiles[file_index];
*out_file_index = file_index;
return 0;
}
/**
* Get a parameter at |index| as a DIR*.
* @param[in] params The parameter array.
* @param[in] index The index in |params| to get.
* @param[out] out_file The output DIR*.
* @param[out] out_file_index The index of the output DIR* in g_OpenDirs.
* @param[out] out_error An error message, if this operation failed.
* @return int 0 if successful, otherwise 1.
*/
static int GetParamDir(struct PP_Var params,
uint32_t index,
DIR** out_dir,
int32_t* out_dir_index,
const char** out_error) {
struct PP_Var value = g_ppb_var_array->Get(params, index);
if (value.type != PP_VARTYPE_INT32) {
*out_error =
PrintfToNewString("Expected param at index %d to be an int32", index);
return 1;
}
int32_t dir_index = value.value.as_int;
if (dir_index < 0 || dir_index >= MAX_OPEN_DIRS) {
*out_error = PrintfToNewString("Dir at index %d is out range", dir_index);
return 1;
}
if (g_OpenDirs[dir_index] == NULL) {
*out_error = PrintfToNewString("Dir index %d is not open", dir_index);
return 1;
}
*out_dir = g_OpenDirs[dir_index];
*out_dir_index = dir_index;
return 0;
}
/**
* Get a parameter at |index| as an int.
* @param[in] params The parameter array.
* @param[in] index The index in |params| to get.
* @param[out] out_file The output int32_t.
* @param[out] out_error An error message, if this operation failed.
* @return int 0 if successful, otherwise 1.
*/
static int GetParamInt(struct PP_Var params,
uint32_t index,
int32_t* out_int,
const char** out_error) {
struct PP_Var value = g_ppb_var_array->Get(params, index);
if (value.type != PP_VARTYPE_INT32) {
*out_error =
PrintfToNewString("Expected param at index %d to be an int32", index);
return 1;
}
*out_int = value.value.as_int;
return 0;
}
/**
* Create a response PP_Var to send back to JavaScript.
* @param[out] response_var The response PP_Var.
* @param[in] cmd The name of the function that is being executed.
* @param[out] out_error An error message, if this call failed.
*/
static void CreateResponse(struct PP_Var* response_var,
const char* cmd,
const char** out_error) {
PP_Bool result;
struct PP_Var dict_var = g_ppb_var_dictionary->Create();
struct PP_Var cmd_key = CStrToVar("cmd");
struct PP_Var cmd_value = CStrToVar(cmd);
result = g_ppb_var_dictionary->Set(dict_var, cmd_key, cmd_value);
g_ppb_var->Release(cmd_key);
g_ppb_var->Release(cmd_value);
if (!result) {
g_ppb_var->Release(dict_var);
*out_error =
PrintfToNewString("Unable to set \"cmd\" key in result dictionary");
return;
}
struct PP_Var args_key = CStrToVar("args");
struct PP_Var args_value = g_ppb_var_array->Create();
result = g_ppb_var_dictionary->Set(dict_var, args_key, args_value);
g_ppb_var->Release(args_key);
g_ppb_var->Release(args_value);
if (!result) {
g_ppb_var->Release(dict_var);
*out_error =
PrintfToNewString("Unable to set \"args\" key in result dictionary");
return;
}
*response_var = dict_var;
}
/**
* Append a PP_Var to the response dictionary.
* @param[in,out] response_var The response PP_var.
* @param[in] value The value to add to the response args.
* @param[out] out_error An error message, if this call failed.
*/
static void AppendResponseVar(struct PP_Var* response_var,
struct PP_Var value,
const char** out_error) {
struct PP_Var args_value = GetDictVar(*response_var, "args");
uint32_t args_length = g_ppb_var_array->GetLength(args_value);
PP_Bool result = g_ppb_var_array->Set(args_value, args_length, value);
if (!result) {
// Release the dictionary that was there before.
g_ppb_var->Release(*response_var);
// Return an error message instead.
*response_var = PP_MakeUndefined();
*out_error = PrintfToNewString("Unable to append value to result");
return;
}
}
/**
* Append an int to the response dictionary.
* @param[in,out] response_var The response PP_var.
* @param[in] value The value to add to the response args.
* @param[out] out_error An error message, if this call failed.
*/
static void AppendResponseInt(struct PP_Var* response_var,
int32_t value,
const char** out_error) {
AppendResponseVar(response_var, PP_MakeInt32(value), out_error);
}
/**
* Append a string to the response dictionary.
* @param[in,out] response_var The response PP_var.
* @param[in] value The value to add to the response args.
* @param[out] out_error An error message, if this call failed.
*/
static void AppendResponseString(struct PP_Var* response_var,
const char* value,
const char** out_error) {
struct PP_Var value_var = CStrToVar(value);
AppendResponseVar(response_var, value_var, out_error);
g_ppb_var->Release(value_var);
}
#define CHECK_PARAM_COUNT(name, expected) \
if (GetNumParams(params) != expected) { \
*out_error = PrintfToNewString(#name " takes " #expected " parameters." \
" Got %d", GetNumParams(params)); \
return 1; \
}
#define PARAM_STRING(index, var) \
char* var; \
uint32_t var##_len; \
if (GetParamString(params, index, &var, &var##_len, out_error)) { \
return 1; \
}
#define PARAM_FILE(index, var) \
FILE* var; \
int32_t var##_index; \
if (GetParamFile(params, index, &var, &var##_index, out_error)) { \
return 1; \
}
#define PARAM_DIR(index, var) \
DIR* var; \
int32_t var##_index; \
if (GetParamDir(params, index, &var, &var##_index, out_error)) { \
return 1; \
}
#define PARAM_INT(index, var) \
int32_t var; \
if (GetParamInt(params, index, &var, out_error)) { \
return 1; \
}
#define CREATE_RESPONSE(name) CreateResponse(output, #name, out_error)
#define RESPONSE_STRING(var) AppendResponseString(output, var, out_error)
#define RESPONSE_INT(var) AppendResponseInt(output, var, out_error)
/**
* Handle a call to fopen() made by JavaScript.
*
* fopen expects 2 parameters:
* 0: the path of the file to open
* 1: the mode string
* on success, fopen returns a result in |output|:
* 0: "fopen"
* 1: the filename opened
* 2: the file index
* on failure, fopen returns an error string in |out_error|.
*/
int HandleFopen(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(fopen, 2);
PARAM_STRING(0, filename);
PARAM_STRING(1, mode);
FILE* file = fopen(filename, mode);
if (!file) {
*out_error = PrintfToNewString("fopen returned a NULL FILE*");
return 1;
}
int file_index = AddFileToMap(file);
if (file_index == -1) {
*out_error = PrintfToNewString("Example only allows %d open file handles",
MAX_OPEN_FILES);
return 1;
}
CREATE_RESPONSE(fopen);
RESPONSE_STRING(filename);
RESPONSE_INT(file_index);
return 0;
}
/**
* Handle a call to fwrite() made by JavaScript.
*
* fwrite expects 2 parameters:
* 0: The index of the file (which is mapped to a FILE*)
* 1: A string to write to the file
* on success, fwrite returns a result in |output|:
* 0: "fwrite"
* 1: the file index
* 2: the number of bytes written
* on failure, fwrite returns an error string in |out_error|.
*/
int HandleFwrite(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(fwrite, 2);
PARAM_FILE(0, file);
PARAM_STRING(1, data);
size_t bytes_written = fwrite(data, 1, data_len, file);
if (ferror(file)) {
*out_error = PrintfToNewString(
"Wrote %" PRIuS " bytes, but ferror() returns true", bytes_written);
return 1;
}
CREATE_RESPONSE(fwrite);
RESPONSE_INT(file_index);
RESPONSE_INT((int32_t)bytes_written);
return 0;
}
/**
* Handle a call to fread() made by JavaScript.
*
* fread expects 2 parameters:
* 0: The index of the file (which is mapped to a FILE*)
* 1: The number of bytes to read from the file.
* on success, fread returns a result in |output|:
* 0: "fread"
* 1: the file index
* 2: the data read from the file
* on failure, fread returns an error string in |out_error|.
*/
int HandleFread(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(fread, 2);
PARAM_FILE(0, file);
PARAM_INT(1, data_len);
char* buffer = (char*)malloc(data_len + 1);
size_t bytes_read = fread(buffer, 1, data_len, file);
buffer[bytes_read] = 0;
if (ferror(file)) {
*out_error = PrintfToNewString(
"Read %" PRIuS " bytes, but ferror() returns true", bytes_read);
free(buffer);
return 1;
}
CREATE_RESPONSE(fread);
RESPONSE_INT(file_index);
RESPONSE_STRING(buffer);
free(buffer);
return 0;
}
/**
* Handle a call to fseek() made by JavaScript.
*
* fseek expects 3 parameters:
* 0: The index of the file (which is mapped to a FILE*)
* 1: The offset to seek to
* 2: An integer representing the whence parameter of standard fseek.
* whence = 0: seek from the beginning of the file
* whence = 1: seek from the current file position
* whence = 2: seek from the end of the file
* on success, fseek returns a result in |output|:
* 0: "fseek"
* 1: the file index
* 2: The new file position
* on failure, fseek returns an error string in |out_error|.
*/
int HandleFseek(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(fseek, 3);
PARAM_FILE(0, file);
PARAM_INT(1, offset);
PARAM_INT(2, whence);
int result = fseek(file, offset, whence);
if (result) {
*out_error = PrintfToNewString("fseek returned error %d", result);
return 1;
}
offset = (int32_t)ftell(file);
if (offset < 0) {
*out_error = PrintfToNewString(
"fseek succeeded, but ftell returned error %d", offset);
return 1;
}
CREATE_RESPONSE(fseek);
RESPONSE_INT(file_index);
RESPONSE_INT(offset);
return 0;
}
/**
* Handle a call to fflush() made by JavaScript.
*
* fflush expects 1 parameters:
* 0: The index of the file (which is mapped to a FILE*)
* on success, fflush returns a result in |output|:
* 0: "fflush"
* 1: the file index
* on failure, fflush returns an error string in |out_error|.
*/
int HandleFflush(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(fflush, 1);
PARAM_FILE(0, file);
fflush(file);
CREATE_RESPONSE(fflush);
RESPONSE_INT(file_index);
return 0;
}
/**
* Handle a call to fclose() made by JavaScript.
*
* fclose expects 1 parameter:
* 0: The index of the file (which is mapped to a FILE*)
* on success, fclose returns a result in |output|:
* 0: "fclose"
* 1: the file index
* on failure, fclose returns an error string in |out_error|.
*/
int HandleFclose(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(fclose, 1);
PARAM_FILE(0, file);
int result = fclose(file);
if (result) {
*out_error = PrintfToNewString("fclose returned error %d", result);
return 1;
}
RemoveFileFromMap(file_index);
CREATE_RESPONSE(fclose);
RESPONSE_INT(file_index);
return 0;
}
/**
* Handle a call to stat() made by JavaScript.
*
* stat expects 1 parameter:
* 0: The name of the file
* on success, stat returns a result in |output|:
* 0: "stat"
* 1: the file name
* 2: the size of the file
* on failure, stat returns an error string in |out_error|.
*/
int HandleStat(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(stat, 1);
PARAM_STRING(0, filename);
struct stat buf;
memset(&buf, 0, sizeof(buf));
int result = stat(filename, &buf);
if (result == -1) {
*out_error = PrintfToNewString("stat returned error %d", errno);
return 1;
}
CREATE_RESPONSE(stat);
RESPONSE_STRING(filename);
RESPONSE_INT((int32_t)buf.st_size);
return 0;
}
/**
* Handle a call to opendir() made by JavaScript.
*
* opendir expects 1 parameter:
* 0: The name of the directory
* on success, opendir returns a result in |output|:
* 0: "opendir"
* 1: the directory name
* 2: the index of the directory
* on failure, opendir returns an error string in |out_error|.
*/
int HandleOpendir(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
#if defined(WIN32)
*out_error = PrintfToNewString("Win32 does not support opendir");
return 1;
#else
CHECK_PARAM_COUNT(opendir, 1);
PARAM_STRING(0, dirname);
DIR* dir = opendir(dirname);
if (!dir) {
*out_error = PrintfToNewString("opendir returned a NULL DIR*");
return 1;
}
int dir_index = AddDirToMap(dir);
if (dir_index == -1) {
*out_error = PrintfToNewString("Example only allows %d open dir handles",
MAX_OPEN_DIRS);
return 1;
}
CREATE_RESPONSE(opendir);
RESPONSE_STRING(dirname);
RESPONSE_INT(dir_index);
return 0;
#endif
}
/**
* Handle a call to readdir() made by JavaScript.
*
* readdir expects 1 parameter:
* 0: The index of the directory (which is mapped to a DIR*)
* on success, opendir returns a result in |output|:
* 0: "readdir"
* 1: the inode number of the entry
* 2: the name of the entry
* if there are no more entries, |output| contains:
* 0: "readdir"
* on failure, readdir returns an error string in |out_error|.
*/
int HandleReaddir(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
#if defined(WIN32)
*out_error = PrintfToNewString("Win32 does not support readdir");
return 1;
#else
CHECK_PARAM_COUNT(readdir, 1);
PARAM_DIR(0, dir);
struct dirent* entry = readdir(dir);
CREATE_RESPONSE(readdir);
RESPONSE_INT(dir_index);
if (entry != NULL) {
RESPONSE_INT((int32_t)entry->d_ino);
RESPONSE_STRING(entry->d_name);
}
return 0;
#endif
}
/**
* Handle a call to closedir() made by JavaScript.
*
* closedir expects 1 parameter:
* 0: The index of the directory (which is mapped to a DIR*)
* on success, closedir returns a result in |output|:
* 0: "closedir"
* 1: the name of the directory
* on failure, closedir returns an error string in |out_error|.
*/
int HandleClosedir(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
#if defined(WIN32)
*out_error = PrintfToNewString("Win32 does not support closedir");
return 1;
#else
CHECK_PARAM_COUNT(closedir, 1);
PARAM_DIR(0, dir);
int result = closedir(dir);
if (result) {
*out_error = PrintfToNewString("closedir returned error %d", result);
return 1;
}
RemoveDirFromMap(dir_index);
CREATE_RESPONSE(closedir);
RESPONSE_INT(dir_index);
return 0;
#endif
}
/**
* Handle a call to mkdir() made by JavaScript.
*
* mkdir expects 1 parameter:
* 0: The name of the directory
* 1: The mode to use for the new directory, in octal.
* on success, mkdir returns a result in |output|:
* 0: "mkdir"
* 1: the name of the directory
* on failure, mkdir returns an error string in |out_error|.
*/
int HandleMkdir(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(mkdir, 2);
PARAM_STRING(0, dirname);
PARAM_INT(1, mode);
int result = mkdir(dirname, mode);
if (result != 0) {
*out_error = PrintfToNewString("mkdir returned error: %d", errno);
return 1;
}
CREATE_RESPONSE(mkdir);
RESPONSE_STRING(dirname);
return 0;
}
/**
* Handle a call to rmdir() made by JavaScript.
*
* rmdir expects 1 parameter:
* 0: The name of the directory to remove
* on success, rmdir returns a result in |output|:
* 0: "rmdir"
* 1: the name of the directory
* on failure, rmdir returns an error string in |out_error|.
*/
int HandleRmdir(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(rmdir, 1);
PARAM_STRING(0, dirname);
int result = rmdir(dirname);
if (result != 0) {
*out_error = PrintfToNewString("rmdir returned error: %d", errno);
return 1;
}
CREATE_RESPONSE(rmdir);
RESPONSE_STRING(dirname);
return 0;
}
/**
* Handle a call to chdir() made by JavaScript.
*
* chdir expects 1 parameter:
* 0: The name of the directory
* on success, chdir returns a result in |output|:
* 0: "chdir"
* 1: the name of the directory
* on failure, chdir returns an error string in |out_error|.
*/
int HandleChdir(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(chdir, 1);
PARAM_STRING(0, dirname);
int result = chdir(dirname);
if (result != 0) {
*out_error = PrintfToNewString("chdir returned error: %d", errno);
return 1;
}
CREATE_RESPONSE(chdir);
RESPONSE_STRING(dirname);
return 0;
}
/**
* Handle a call to getcwd() made by JavaScript.
*
* getcwd expects 0 parameters.
* on success, getcwd returns a result in |output|:
* 0: "getcwd"
* 1: the current working directory
* on failure, getcwd returns an error string in |out_error|.
*/
int HandleGetcwd(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(getcwd, 0);
char cwd[PATH_MAX];
char* result = getcwd(cwd, PATH_MAX);
if (result == NULL) {
*out_error = PrintfToNewString("getcwd returned error: %d", errno);
return 1;
}
CREATE_RESPONSE(getcwd);
RESPONSE_STRING(cwd);
return 0;
}
/**
* Handle a call to getaddrinfo() made by JavaScript.
*
* getaddrinfo expects 1 parameter:
* 0: The name of the host to look up.
* on success, getaddrinfo returns a result in |output|:
* 0: "getaddrinfo"
* 1: The canonical name
* 2*n+2: Host name
* 2*n+3: Address type (either "AF_INET" or "AF_INET6")
* on failure, getaddrinfo returns an error string in |out_error|.
*/
int HandleGetaddrinfo(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(getaddrinfo, 2);
PARAM_STRING(0, name);
PARAM_STRING(1, family);
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
if (!strcmp(family, "AF_INET"))
hints.ai_family = AF_INET;
else if (!strcmp(family, "AF_INET6"))
hints.ai_family = AF_INET6;
else if (!strcmp(family, "AF_UNSPEC"))
hints.ai_family = AF_UNSPEC;
else {
*out_error = PrintfToNewString("getaddrinfo uknown family: %s", family);
return 1;
}
struct addrinfo* ai;
int rtn = getaddrinfo(name, NULL, &hints, &ai);
if (rtn != 0) {
*out_error = PrintfToNewString("getaddrinfo failed, error is \"%s\"",
gai_strerror(rtn));
return 2;
}
CREATE_RESPONSE(getaddrinfo);
RESPONSE_STRING(ai->ai_canonname);
struct addrinfo* current = ai;
while (current) {
char addr_str[INET6_ADDRSTRLEN];
if (ai->ai_family == AF_INET6) {
struct sockaddr_in6* in6 = (struct sockaddr_in6*)current->ai_addr;
inet_ntop(
ai->ai_family, &in6->sin6_addr.s6_addr, addr_str, sizeof(addr_str));
} else if (ai->ai_family == AF_INET) {
struct sockaddr_in* in = (struct sockaddr_in*)current->ai_addr;
inet_ntop(ai->ai_family, &in->sin_addr, addr_str, sizeof(addr_str));
}
RESPONSE_STRING(addr_str);
RESPONSE_STRING(ai->ai_family == AF_INET ? "AF_INET" : "AF_INET6");
current = current->ai_next;
}
freeaddrinfo(ai);
return 0;
}
/**
* Handle a call to gethostbyname() made by JavaScript.
*
* gethostbyname expects 1 parameter:
* 0: The name of the host to look up.
* on success, gethostbyname returns a result in |output|:
* 0: "gethostbyname"
* 1: Host name
* 2: Address type (either "AF_INET" or "AF_INET6")
* 3: The first address.
* 4+ The second, third, etc. addresses.
* on failure, gethostbyname returns an error string in |out_error|.
*/
int HandleGethostbyname(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(gethostbyname, 1);
PARAM_STRING(0, name);
struct hostent* info = gethostbyname(name);
if (!info) {
*out_error = PrintfToNewString("gethostbyname failed, error is \"%s\"",
hstrerror(h_errno));
return 1;
}
CREATE_RESPONSE(gethostbyname);
RESPONSE_STRING(info->h_name);
RESPONSE_STRING(info->h_addrtype == AF_INET ? "AF_INET" : "AF_INET6");
struct in_addr** addr_list = (struct in_addr**)info->h_addr_list;
int i;
for (i = 0; addr_list[i] != NULL; i++) {
if (info->h_addrtype == AF_INET) {
RESPONSE_STRING(inet_ntoa(*addr_list[i]));
} else { // IPv6
char addr_str[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, addr_list[i], addr_str, sizeof(addr_str));
RESPONSE_STRING(addr_str);
}
}
return 0;
}
/**
* Handle a call to connect() made by JavaScript.
*
* connect expects 2 parameters:
* 0: The hostname to connect to.
* 1: The port number to connect to.
* on success, connect returns a result in |output|:
* 0: "connect"
* 1: The socket file descriptor.
* on failure, connect returns an error string in |out_error|.
*/
int HandleConnect(struct PP_Var params,
struct PP_Var* output,
const char** out_error) {
CHECK_PARAM_COUNT(connect, 2);
PARAM_STRING(0, hostname);
PARAM_INT(1, port);
// Lookup host
struct hostent* hostent = gethostbyname(hostname);
if (hostent == NULL) {
*out_error = PrintfToNewString("gethostbyname() returned error: %d", errno);
return 1;