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modules.c
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modules.c
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#define DEBUG_MODULES
#include "manager.h"
#ifdef DEBUG_MODULES
#define DPRINTF(fmt, args...) \
do { printf("modules: " fmt , ##args); } while (0)
#else
#define DPRINTF(fmt, args...) do {} while(0)
#endif
int file_check_executable(char *filename)
{
int ret;
ret = (access(filename, X_OK) == 0);
DPRINTF("%s: Checking file %s for executable bit, result is %d\n", __FUNCTION__, filename, ret);
return ret;
}
int get_process_pid_from_ps(char *process)
{
char cmd[2048] = { 0 };
char tmp[16] = { 0 };
FILE *fp = NULL;
//snprintf(cmd, sizeof(cmd), "ps aux | awk '/^%s /{ split($0, a, \" \"); print a[2] }' 2>&1", process);
snprintf(cmd, sizeof(cmd), "ps aux | grep %s | awk '{ split($0, a, \" \"); print a[2] }' 2>&1", process);
//DPRINTF("%s: Command is '%s'\n", __FUNCTION__, cmd);
fp = popen(cmd, "r");
if (fp == NULL)
return -EINVAL;
fgets(tmp, sizeof(tmp), fp);
fclose(fp);
return atoi(tmp);
}
/*
* This function can process the read://filename.ext syntax to read the data.
* Returns the read data (simple line)
*/
char *process_read_handler(char *value)
{
FILE *fp = NULL;
char *filename = NULL;
char data[4096] = { 0 };
if (strncmp(value, "read://", 7) != 0)
return NULL;
filename = value + 7;
if (strlen(filename) == 0)
return NULL;
if (filename[0] != '/') {
char buf[4096] = { 0 };
getcwd(buf, sizeof(buf));
if ((strlen(buf) + strlen(filename) + 1) < sizeof(buf)) {
strcat(buf, "/");
strcat(buf, filename);
}
filename = strdup(buf);
}
if (access(filename, R_OK) != 0)
return NULL;
fp = fopen(filename, "r");
if (fp == NULL)
return NULL;
fgets(data, sizeof(data), fp);
fclose(fp);
free(filename);
return strdup(data);
}
char *process_exec_handler(char *binary)
{
FILE *fp = NULL;
char s[4096] = { 0 };
if (access(binary, X_OK) != 0)
return NULL;
fp = popen(binary, "r");
if (fp == NULL)
return NULL;
fgets(s, 4096, fp);
fclose(fp);
/* Strip \n from the end */
if (s[strlen(s) - 1] == '\n')
s[strlen(s) - 1] = 0;
return strdup(s);
}
char *process_handlers(char *path)
{
if (path == NULL)
return NULL;
if (strncmp(path, "read://", 7) == 0)
return process_read_handler(path);
if (strncmp(path, "exec://", 7) == 0)
return process_exec_handler(path + 7);
return NULL;
}
int module_install(char *base_path, char *libname)
{
int ret = -EINVAL;
char path[BUFSIZE];
void *lib = NULL;
char *val = NULL;
void *pInstall = NULL;
char *tmpnam = strdup(libname);
typedef char* (*tInstallFunc) (char*);
snprintf(path, sizeof(path), "%s/var", base_path);
mkdir(path, 0755);
snprintf(path, sizeof(path), "%s/var/%s-install-lock", base_path, basename(tmpnam));
if (access(path, R_OK) == 0) {
DPRINTF("%s: Module %s already installed\n", __FUNCTION__, basename(tmpnam));
return 0;
}
lib = dlopen(libname, RTLD_LAZY);
if (lib == NULL) {
DPRINTF("%s: Cannot load library '%s'", __FUNCTION__, libname);
return -EINVAL;
}
pInstall = dlsym(lib, "srvmgr_module_install");
if (pInstall == NULL) {
DPRINTF("%s: Cannot read installation function symbol from library %s\n",
__FUNCTION__, libname);
goto cleanup;
}
tInstallFunc fInstall = (tInstallFunc) pInstall;
if (fInstall == NULL) {
DPRINTF("%s: Cannot find installation symbol\n", __FUNCTION__);
goto cleanup;
}
val = fInstall(base_path);
if ((val != NULL) && (strcmp(val, "ERR") == 0)) {
fprintf(stderr, "Warning: Cannot install module %s\n", basename(tmpnam));
ret = -EIO;
}
else {
if (val != NULL) {
ret = users_add(val, val, NULL, NULL, NULL);
if ((ret == 0) || (ret == -EEXIST)) {
void *pPostInstall = NULL;
ret = 0;
pPostInstall = dlsym(lib, "srvmgr_module_install_post");
if (pPostInstall != NULL) {
typedef int (*tPostInstallFunc) (char*);
tPostInstallFunc fPostInstall = (tPostInstallFunc) pPostInstall;
if (fPostInstall != NULL)
ret = fPostInstall(base_path);
}
}
}
else
ret = 0;
if (ret == 0) {
/* Touches the module lock file */
close( open(path, O_WRONLY | O_CREAT, 0600) );
}
}
cleanup:
dlclose(lib);
if (ret == 0)
DPRINTF("%s: Module %s successfully installed\n", __FUNCTION__, basename(tmpnam));
return ret;
}
int module_load(char *base_path, char *libname)
{
int ret = -1;
int port = -1;
void *lib = NULL;
void *pIdent = NULL;
void *pKeyword = NULL;
void *pGetPort = NULL;
void *pIsApplicable = NULL;
char *tmpnam = strdup(libname);
typedef char* (*tIdentFunc) (void);
typedef char* (*tKeywordFunc) (void);
typedef char* (*tInstallFunc) (void);
typedef int (*tIsApplicableFunc) (char*);
if (module_install(base_path, libname) != 0) {
DPRINTF("Error: Module %s installation failed\n", basename(tmpnam));
return -EINVAL;
}
lib = dlopen(libname, RTLD_LAZY);
if (lib == NULL) {
DPRINTF("%s: Cannot load library '%s'", __FUNCTION__, libname);
goto done;
}
/* Get identification */
pIdent = dlsym(lib, "srvmgr_module_identification");
if (pIdent == NULL) {
DPRINTF("%s: Cannot read identification symbol from library %s",
__FUNCTION__, libname);
goto cleanup;
}
tIdentFunc fIdent = (tIdentFunc) pIdent;
if (fIdent == NULL)
goto cleanup;
/* Get keyword */
pKeyword = dlsym(lib, "srvmgr_module_get_keyword");
if (pKeyword == NULL) {
DPRINTF("%s: Cannot read keyword symbol from library %s",
__FUNCTION__, libname);
goto cleanup;
}
tKeywordFunc fKeyword = (tKeywordFunc) pKeyword;
if (fKeyword == NULL)
goto cleanup;
/* Is module applicable? */
pIsApplicable = dlsym(lib, "srvmgr_module_is_applicable");
if (pIsApplicable == NULL) {
DPRINTF("%s: Cannot read is_applicable symbol from library %s",
__FUNCTION__, libname);
goto cleanup;
}
tIsApplicableFunc fIsApplicable = (tIsApplicableFunc) pIsApplicable;
if (fIsApplicable == NULL)
goto cleanup;
/* Here 1 means true, i.e. module is applicable */
if ( fIsApplicable(base_path) != 1 )
goto cleanup;
/* Get port if applicable */
pGetPort = dlsym(lib, "srvmgr_module_get_port");
if (pGetPort != NULL) {
typedef int (*tGetPortFunc) (void);
tGetPortFunc fGetPort = (tGetPortFunc) pGetPort;
port = fGetPort();
}
/* Put module into the module pool */
if (modules == NULL)
modules = (tModule *)malloc( sizeof(tModule) );
else
modules = (tModule *)realloc( modules, (numModules + 1) * sizeof(tModule) );
modules[numModules].ident = strdup( fIdent() );
modules[numModules].keyword = strdup( fKeyword() );
modules[numModules].port = port;
modules[numModules].name = strdup( libname );
modules[numModules].handle = lib;
numModules++;
ret = 0;
goto done;
cleanup:
dlclose(lib);
done:
return ret;
}
int module_process_by_handle(void *lib, char *base_path, char *data, int authorized)
{
void *pProcess = NULL;
typedef int (*tProcessFunc) (char *base_path, char *data, int authorized);
pProcess = dlsym(lib, "srvmgr_module_run");
if (pProcess == NULL)
return -1;
tProcessFunc fProcess = (tProcessFunc) pProcess;
return fProcess(base_path, data, authorized);
}
int module_process_all(char *base_path, char *data, int authorized)
{
int ret = -ENOENT, i;
if (numModules == 0)
return ret;
for (i = 0; i < numModules; i++) {
if ((ret = module_process_by_handle(modules[i].handle, base_path, data,
authorized)) != -ENOTSUP)
return ret;
}
return ret;
}
int module_duplicates_exist(void)
{
int i, j, ret = 0;
for (i = 0; i < numModules; i++) {
for (j = 0; j < numModules; j++) {
if ((strcmp(modules[i].keyword, modules[j].keyword) == 0)
&& (i != j)) {
fprintf(stderr, "Warning: Modules %s and %s handles the same keyword: %s\n",
basename(modules[i].name), basename(modules[j].name), modules[i].keyword);
ret = 1;
}
}
}
return ret;
}
void module_dump(void)
{
int i;
if (numModules == 0)
return;
DPRINTF("-----\n");
DPRINTF("Dumping data for %d module(s):\n", numModules);
for (i = 0; i < numModules; i++) {
DPRINTF("Module #%d:\n", i+1);
DPRINTF("\tHandle: 0x%p\n", modules[i].handle);
DPRINTF("\tFilename: %s\n", basename(modules[i].name));
DPRINTF("\tIdentification: %s\n", modules[i].ident);
DPRINTF("\tKeyword: %s\n", modules[i].keyword);
if (GET_PORT_TCP(modules[i].port) && GET_PORT_UDP(modules[i].port))
DPRINTF("\tPorts: TCP port %d, UDP port %d\n", GET_PORT_TCP(modules[i].port),
GET_PORT_UDP(modules[i].port));
else
if (GET_PORT_TCP(modules[i].port))
DPRINTF("\tTCP Port: %d\n", GET_PORT_TCP(modules[i].port));
else
if (GET_PORT_UDP(modules[i].port))
DPRINTF("\tUDP Port: %d\n", GET_PORT_UDP(modules[i].port));
}
DPRINTF("-----\n");
}
void modules_free(void)
{
int i;
if (numModules == 0)
return;
for (i = 0; i < numModules; i++) {
dlclose(modules[i].handle);
free(modules[i].ident);
modules[i].ident = NULL;
free(modules[i].name);
modules[i].name = NULL;
free(modules[i].keyword);
modules[i].keyword = NULL;
}
numModules = 0;
free(modules);
}
int modules_load_all(char *base_path, char *directory)
{
char filename[BUFSIZE];
struct dirent *entry;
DIR *d;
d = opendir(directory);
if (d == NULL)
return -1;
while ((entry = readdir(d)) != NULL) {
if (strstr(entry->d_name, ".so") != NULL) {
snprintf(filename, sizeof(filename), "%s/%s", directory, entry->d_name);
module_load(base_path, filename);
}
}
closedir(d);
return module_duplicates_exist();
}
int modules_init(void)
{
modules = NULL;
numModules = 0;
}
int modules_get_active(void)
{
return numModules;
}
#if 0
int main()
{
modules = NULL;
numModules = 0;
atexit(modules_free);
modules_load_all(".");
module_dump();
module_process_all("SCM-GIT CREATE REPO test FOR domain1", 1);
return 0;
}
#endif