+#define _GNU_SOURCE
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
+#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <execinfo.h>
+
+#include "ustcomm.h"
+#include "localerr.h"
#define UNIX_PATH_MAX 108
#define SOCK_DIR "/tmp/socks"
#define UST_SIGNAL SIGIO
+#define MSG_MAX 1000
+
+//static void bt(void)
+//{
+// void *buffer[100];
+// int result;
+//
+// result = backtrace(&buffer, 100);
+// backtrace_symbols_fd(buffer, result, STDERR_FILENO);
+//}
+
static void signal_process(pid_t pid)
{
int result;
result = kill(pid, UST_SIGNAL);
if(result == -1) {
- perror("kill");
+ PERROR("kill");
return;
}
sleep(1);
}
-int send_message(pid_t pid, const char *msg, const char *reply)
+int send_message_path(const char *path, const char *msg, char **reply, int signalpid)
{
int fd;
int result;
struct sockaddr_un addr;
- char *buf;
result = fd = socket(PF_UNIX, SOCK_DGRAM, 0);
if(result == -1) {
- perror("socket");
- return 1;
+ PERROR("socket");
+ return -1;
}
addr.sun_family = AF_UNIX;
- result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s/%d", SOCK_DIR, pid);
+ result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s", path);
+ if(result >= UNIX_PATH_MAX) {
+ ERR("string overflow allocating socket name");
+ return -1;
+ }
+
+ if(signalpid >= 0)
+ signal_process(signalpid);
+
+ result = sendto(fd, msg, strlen(msg), 0, (struct sockaddr *)&addr, sizeof(addr));
+ if(result == -1) {
+ PERROR("sendto");
+ return -1;
+ }
+
+ if(!reply)
+ return 0;
+
+ *reply = (char *) malloc(MSG_MAX+1);
+ result = recvfrom(fd, *reply, MSG_MAX, 0, NULL, NULL);
+ if(result == -1) {
+ PERROR("recvfrom");
+ return -1;
+ }
+
+ (*reply)[result] = '\0';
+
+ return 0;
+}
+
+/* pid: the pid of the trace process that must receive the msg
+ msg: pointer to a null-terminated message to send
+ reply: location where to put the null-terminated string of the reply;
+ it must be free'd after usage
+ */
+
+int send_message(pid_t pid, const char *msg, char **reply)
+{
+ int result;
+ char path[UNIX_PATH_MAX];
+
+ result = snprintf(path, UNIX_PATH_MAX, "%s/%d", SOCK_DIR, pid);
+ if(result >= UNIX_PATH_MAX) {
+ fprintf(stderr, "string overflow allocating socket name");
+ return -1;
+ }
+
+ send_message_path(path, msg, reply, pid);
+
+ return 0;
+}
+
+/* Called by an app to ask the consumer daemon to connect to it. */
+
+int ustcomm_request_consumer(pid_t pid, const char *channel)
+{
+ char path[UNIX_PATH_MAX];
+ int result;
+ char *msg;
+
+ result = snprintf(path, UNIX_PATH_MAX, "%s/ustd", SOCK_DIR);
if(result >= UNIX_PATH_MAX) {
fprintf(stderr, "string overflow allocating socket name");
- return 1;
+ return -1;
}
- asprintf(&buf, "%s\n", msg);
+ asprintf(&msg, "collect %d %s", pid, channel);
+
+ send_message_path(path, msg, NULL, -1);
+ free(msg);
+
+ return 0;
+}
+
+static int recv_message_fd(int fd, char **msg, struct ustcomm_source *src)
+{
+ int result;
+ size_t initial_addrlen,addrlen;
+
+ *msg = (char *) malloc(MSG_MAX+1);
+
+ if(src) {
+ initial_addrlen = addrlen = sizeof(src->addr);
- signal_process(pid);
+ result = recvfrom(fd, *msg, MSG_MAX, 0, &src->addr, &addrlen);
+ if(initial_addrlen != addrlen) {
+ ERR("recvfrom: unexpected address length");
+ return -1;
+ }
+ }
+ else {
+ result = recvfrom(fd, *msg, MSG_MAX, 0, NULL, NULL);
+ }
- result = sendto(fd, buf, strlen(buf), 0, (struct sockaddr *)&addr, sizeof(addr));
if(result == -1) {
- perror("sendto");
- return 1;
+ PERROR("recvfrom");
+ return -1;
}
- free(buf);
+ (*msg)[result] = '\0';
+
+ DBG("ustcomm_app_recv_message: result is %d, message is %s", result, (*msg));
return 0;
}
+int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src)
+{
+ return recv_message_fd(ustd->fd, msg, src);
+}
+
+int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src)
+{
+ return recv_message_fd(app->fd, msg, src);
+}
+
+static int init_named_socket(char *name, char **path_out)
+{
+ int result;
+ int fd;
+
+ struct sockaddr_un addr;
+
+ result = fd = socket(PF_UNIX, SOCK_DGRAM, 0);
+ if(result == -1) {
+ PERROR("socket");
+ return -1;
+ }
+
+ addr.sun_family = AF_UNIX;
+
+ strncpy(addr.sun_path, name, UNIX_PATH_MAX);
+ addr.sun_path[UNIX_PATH_MAX-1] = '\0';
+
+ result = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
+ if(result == -1) {
+ PERROR("bind");
+ goto close_sock;
+ }
+
+ if(path_out) {
+ *path_out = "";
+ *path_out = strdupa(addr.sun_path);
+ }
+
+ return fd;
+
+ close_sock:
+ close(fd);
+
+ return -1;
+}
+
+int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle)
+{
+ int result;
+ char *name;
+
+ result = asprintf(&name, "%s/%d", SOCK_DIR, (int)pid);
+ if(result >= UNIX_PATH_MAX) {
+ ERR("string overflow allocating socket name");
+ return -1;
+ }
+
+ handle->fd = init_named_socket(name, &(handle->socketpath));
+ if(handle->fd < 0) {
+ goto free_name;
+ }
+ free(name);
+
+ return 0;
+
+free_name:
+ free(name);
+ return -1;
+}
+
+int ustcomm_init_ustd(struct ustcomm_ustd *handle)
+{
+ int result;
+ char *name;
+
+ result = asprintf(&name, "%s/%s", SOCK_DIR, "ustd");
+ if(result >= UNIX_PATH_MAX) {
+ ERR("string overflow allocating socket name");
+ return -1;
+ }
+
+ handle->fd = init_named_socket(name, &handle->socketpath);
+ if(handle->fd < 0)
+ return handle->fd;
+ free(name);
+
+ return 0;
+}
+
+char *find_tok(const char *str)
+{
+ while(*str == ' ') {
+ str++;
+
+ if(*str == 0)
+ return NULL;
+ }
+
+ return str;
+}
+
+static char *find_sep(char *str)
+{
+ while(*str != ' ') {
+ str++;
+
+ if(*str == 0)
+ break;
+ }
+
+ return str;
+}
+
+int nth_token_is(char *str, char *token, int tok_no)
+{
+ int i;
+ char *start;
+ char *end;
+
+ for(i=0; i<=tok_no; i++) {
+ str = find_tok(str);
+ if(str == NULL)
+ return -1;
+
+ start = str;
+
+ str = find_sep(str);
+ if(str == NULL)
+ return -1;
+
+ end = str;
+ }
+
+ if(end-start != strlen(token))
+ return 0;
+
+ if(strncmp(start, token, end-start))
+ return 0;
+
+ return 1;
+}
+
+char *nth_token(char *str, int tok_no)
+{
+ static char *retval = NULL;
+ int i;
+ char *start;
+ char *end;
+
+ for(i=0; i<=tok_no; i++) {
+ str = find_tok(str);
+ if(str == NULL)
+ return NULL;
+
+ start = str;
+
+ str = find_sep(str);
+ if(str == NULL)
+ return NULL;
+
+ end = str;
+ }
+
+ if(retval) {
+ free(retval);
+ retval = NULL;
+ }
+
+ retval = strndupa(start, end-start);
+
+ return retval;
+}
projects / ust.git / blobdiff