/* API used by UST components to communicate with each other via sockets. */
#define _GNU_SOURCE
+#include <dirent.h>
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
+#include <limits.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 "usterr.h"
}
struct ustcomm_sock * ustcomm_init_sock(int fd, int epoll_fd,
- struct list_head *list)
+ struct cds_list_head *list)
{
struct epoll_event ev;
struct ustcomm_sock *sock;
sock->epoll_fd = epoll_fd;
if (list) {
- list_add(&sock->list, list);
+ cds_list_add(&sock->list, list);
} else {
- INIT_LIST_HEAD(&sock->list);
+ CDS_INIT_LIST_HEAD(&sock->list);
}
return sock;
void ustcomm_del_sock(struct ustcomm_sock *sock, int keep_in_epoll)
{
- list_del(&sock->list);
+ cds_list_del(&sock->list);
if (!keep_in_epoll) {
if (epoll_ctl(sock->epoll_fd, EPOLL_CTL_DEL, sock->fd, NULL) == -1) {
PERROR("epoll_ctl: failed to delete socket");
ustcomm_del_sock(sock, keep_socket_file);
}
+int ustcomm_recv_alloc(int sock,
+ struct ustcomm_header *header,
+ char **data) {
+ int result;
+ struct ustcomm_header peek_header;
+ struct iovec iov[2];
+ struct msghdr msg;
-/* Called by an app to ask the consumer daemon to connect to it. */
-
-int ustcomm_request_consumer(pid_t pid, const char *channel)
-{
- int result, daemon_fd;
- int retval = 0;
- char *msg=NULL;
- char *explicit_daemon_socket_path, *daemon_path;
+ /* Just to make the caller fail hard */
+ *data = NULL;
- explicit_daemon_socket_path = getenv("UST_DAEMON_SOCKET");
- if (explicit_daemon_socket_path) {
- /* user specified explicitly a socket path */
- result = asprintf(&daemon_path, "%s", explicit_daemon_socket_path);
- } else {
- /* just use the default path */
- result = asprintf(&daemon_path, "%s/ustd", SOCK_DIR);
- }
- if (result < 0) {
- ERR("string overflow allocating socket name");
- return -1;
+ result = recv(sock, &peek_header, sizeof(peek_header),
+ MSG_PEEK | MSG_WAITALL);
+ if (result <= 0) {
+ if(errno == ECONNRESET) {
+ return 0;
+ } else if (errno == EINTR) {
+ return -1;
+ } else if (result < 0) {
+ PERROR("recv");
+ return -1;
+ }
+ return 0;
}
- if (asprintf(&msg, "collect %d %s", pid, channel) < 0) {
- ERR("ustcomm_request_consumer : asprintf failed (collect %d/%s)",
- pid, channel);
- retval = -1;
- goto free_daemon_path;
- }
+ memset(&msg, 0, sizeof(msg));
- result = ustcomm_connect_path(daemon_path, &daemon_fd);
- if (result < 0) {
- WARN("ustcomm_connect_path failed, daemon_path: %s",
- daemon_path);
- retval = -1;
- goto del_string;
+ iov[0].iov_base = (char *)header;
+ iov[0].iov_len = sizeof(struct ustcomm_header);
+
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+
+ if (peek_header.size) {
+ *data = zmalloc(peek_header.size);
+ if (!*data) {
+ return -ENOMEM;
+ }
+
+ iov[1].iov_base = *data;
+ iov[1].iov_len = peek_header.size;
+
+ msg.msg_iovlen++;
}
- result = ustcomm_send_request(daemon_fd, msg, NULL);
+ result = recvmsg(sock, &msg, MSG_WAITALL);
if (result < 0) {
- WARN("ustcomm_send_request failed, daemon path: %s",
- daemon_path);
- retval = -1;
+ free(*data);
+ PERROR("recvmsg failed");
}
- close(daemon_fd);
-del_string:
- free(msg);
-free_daemon_path:
- free(daemon_path);
-
- return retval;
+ return result;
}
/* returns 1 to indicate a message was received
*/
int ustcomm_recv_fd(int sock,
struct ustcomm_header *header,
- char **data, int *fd)
+ char *data, int *fd)
{
int result;
- int retval;
struct ustcomm_header peek_header;
struct iovec iov[2];
struct msghdr msg;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
- if (peek_header.size) {
- if (peek_header.size < 0 || peek_header.size > 100) {
- WARN("big peek header! %d", peek_header.size);
- }
- *data = malloc(peek_header.size);
- if (!*data) {
- ERR("failed to allocate space for message");
+ if (peek_header.size && data) {
+ if (peek_header.size < 0 ||
+ peek_header.size > USTCOMM_DATA_SIZE) {
+ ERR("big peek header! %ld", peek_header.size);
+ return 0;
}
- iov[1].iov_base = (char *)*data;
+ iov[1].iov_base = data;
iov[1].iov_len = peek_header.size;
msg.msg_iovlen++;
msg.msg_controllen = sizeof(buf);
}
- result = recvmsg(sock, &msg,
- MSG_WAITALL);
-
+ result = recvmsg(sock, &msg, MSG_WAITALL);
if (result <= 0) {
- if(errno == ECONNRESET) {
- retval = 0;
- } else if (errno == EINTR) {
- retval = -1;
- } else if (result < 0) {
- PERROR("recv");
- retval = -1;
- } else {
- retval = 0;
+ if (result < 0) {
+ PERROR("recvmsg failed");
}
- free(*data);
- return retval;
+ return result;
}
if (fd && peek_header.fd_included) {
int ustcomm_recv(int sock,
struct ustcomm_header *header,
- char **data)
+ char *data)
{
return ustcomm_recv_fd(sock, header, data, NULL);
}
-int recv_message_conn(int sock, char **msg)
-{
- struct ustcomm_header header;
-
- return ustcomm_recv(sock, &header, msg);
-}
-
int ustcomm_send_fd(int sock,
const struct ustcomm_header *header,
const char *data,
msg.msg_iov = iov;
msg.msg_iovlen = 1;
- if (header->size) {
+ if (header->size && data) {
iov[1].iov_base = (char *)data;
iov[1].iov_len = header->size;
return ustcomm_send_fd(sock, header, data, NULL);
}
-int ustcomm_send_reply(char *msg, int sock)
-{
- int result;
- struct ustcomm_header header;
-
- memset(&header, 0, sizeof(header));
-
- header.size = strlen(msg) + 1;
-
- result = ustcomm_send(sock, &header, msg);
- if(result < 0) {
- ERR("error in ustcomm_send");
- return result;
- }
-
- return 0;
-}
-
-int ustcomm_send_req(int sock,
- const struct ustcomm_header *req_header,
- const char *data,
- char **response)
+int ustcomm_req(int sock,
+ const struct ustcomm_header *req_header,
+ const char *req_data,
+ struct ustcomm_header *res_header,
+ char *res_data)
{
int result;
- struct ustcomm_header res_header;
- result = ustcomm_send(sock, req_header, data);
+ result = ustcomm_send(sock, req_header, req_data);
if ( result <= 0) {
return result;
}
- if (!response) {
- return 1;
- }
-
- return ustcomm_recv(sock,
- &res_header,
- response);
-
-}
-
-/*
- * Return value:
- * 0: Success, but no reply because recv() returned 0
- * 1: Success
- * -1: Error
- *
- * On error, the error message is printed, except on
- * ECONNRESET, which is normal when the application dies.
- */
-
-int ustcomm_send_request(int sock, const char *req, char **reply)
-{
- struct ustcomm_header req_header;
-
- req_header.size = strlen(req) + 1;
-
- return ustcomm_send_req(sock,
- &req_header,
- req,
- reply);
-
+ return ustcomm_recv(sock, res_header, res_data);
}
/* Return value:
return -1;
}
+/* Returns the current users socket directory, must be freed */
+char *ustcomm_user_sock_dir(void)
+{
+ int result;
+ char *sock_dir = NULL;
+
+ result = asprintf(&sock_dir, "%s%s", USER_SOCK_DIR,
+ cuserid(NULL));
+ if (result < 0) {
+ ERR("string overflow allocating directory name");
+ return NULL;
+ }
+
+ return sock_dir;
+}
+
+static int time_and_pid_from_socket_name(char *sock_name, unsigned long *time,
+ pid_t *pid)
+{
+ char *saveptr, *pid_m_time_str;
+ char *sock_basename = strdup(basename(sock_name));
+
+ if (!sock_basename) {
+ return -1;
+ }
+
+ /* This is the pid */
+ pid_m_time_str = strtok_r(sock_basename, ".", &saveptr);
+ if (!pid_m_time_str) {
+ goto out_err;
+ }
+
+ errno = 0;
+ *pid = (pid_t)strtoul(pid_m_time_str, NULL, 10);
+ if (errno) {
+ goto out_err;
+ }
+
+ /* This should be the time-stamp */
+ pid_m_time_str = strtok_r(NULL, ".", &saveptr);
+ if (!pid_m_time_str) {
+ goto out_err;
+ }
+
+ errno = 0;
+ *time = strtoul(pid_m_time_str, NULL, 10);
+ if (errno) {
+ goto out_err;
+ }
+
+ return 0;
+
+out_err:
+ free(sock_basename);
+ return -1;
+}
+
+time_t ustcomm_pid_st_mtime(pid_t pid)
+{
+ struct stat proc_stat;
+ char proc_name[PATH_MAX];
+
+ if (snprintf(proc_name, PATH_MAX - 1, "/proc/%ld", (long) pid) < 0) {
+ return 0;
+ }
+
+ if (stat(proc_name, &proc_stat)) {
+ return 0;
+ }
+
+ return proc_stat.st_mtime;
+}
+
+int ustcomm_is_socket_live(char *sock_name, pid_t *read_pid)
+{
+ time_t time_from_pid;
+ unsigned long time_from_sock;
+ pid_t pid;
+
+ if (time_and_pid_from_socket_name(sock_name, &time_from_sock, &pid)) {
+ return 0;
+ }
+
+ if (read_pid) {
+ *read_pid = pid;
+ }
+
+ time_from_pid = ustcomm_pid_st_mtime(pid);
+ if (!time_from_pid) {
+ return 0;
+ }
+
+ if ((unsigned long) time_from_pid == time_from_sock) {
+ return 1;
+ }
+
+ return 0;
+}
+
+#define MAX_SOCK_PATH_BASE_LEN 100
+
+static int ustcomm_get_sock_name(char *dir_name, pid_t pid, char *sock_name)
+{
+ struct dirent *dirent;
+ char sock_path_base[MAX_SOCK_PATH_BASE_LEN];
+ int len;
+ DIR *dir = opendir(dir_name);
+
+ snprintf(sock_path_base, MAX_SOCK_PATH_BASE_LEN - 1,
+ "%ld.", (long) pid);
+ len = strlen(sock_path_base);
+
+ while ((dirent = readdir(dir))) {
+ if (!strcmp(dirent->d_name, ".") ||
+ !strcmp(dirent->d_name, "..") ||
+ !strcmp(dirent->d_name, "ust-consumer") ||
+ dirent->d_type == DT_DIR ||
+ strncmp(dirent->d_name, sock_path_base, len)) {
+ continue;
+ }
+
+ if (ustcomm_is_socket_live(dirent->d_name, NULL)) {
+ if (snprintf(sock_name, PATH_MAX - 1, "%s/%s",
+ dir_name, dirent->d_name) < 0) {
+ PERROR("path longer than PATH_MAX?");
+ goto out_err;
+ }
+ closedir(dir);
+ return 0;
+ }
+ }
+
+out_err:
+ closedir(dir);
+ return -1;
+}
/* Open a connection to a traceable app.
*
* -1: error
*/
-int ustcomm_connect_app(pid_t pid, int *app_fd)
+static int connect_app_non_root(pid_t pid, int *app_fd)
{
int result;
int retval = 0;
- char *name;
+ char *dir_name;
+ char sock_name[PATH_MAX];
- result = asprintf(&name, "%s/%d", SOCK_DIR, pid);
- if (result < 0) {
- ERR("failed to allocate socket name");
- return -1;
+ dir_name = ustcomm_user_sock_dir();
+ if (!dir_name)
+ return -ENOMEM;
+
+ if (ustcomm_get_sock_name(dir_name, pid, sock_name)) {
+ retval = -ENOENT;
+ goto free_dir_name;
}
- result = ustcomm_connect_path(name, app_fd);
+ result = ustcomm_connect_path(sock_name, app_fd);
if (result < 0) {
ERR("failed to connect to app");
retval = -1;
+ goto free_dir_name;
}
- free(name);
+free_dir_name:
+ free(dir_name);
return retval;
}
-int ensure_dir_exists(const char *dir)
+
+
+static int connect_app_root(pid_t pid, int *app_fd)
+{
+ DIR *tmp_dir;
+ struct dirent *dirent;
+ char dir_name[PATH_MAX], sock_name[PATH_MAX];
+ int result = -1;
+
+ tmp_dir = opendir(USER_TMP_DIR);
+ if (!tmp_dir) {
+ return -1;
+ }
+
+ while ((dirent = readdir(tmp_dir))) {
+ if (!strncmp(dirent->d_name, USER_SOCK_DIR_BASE,
+ strlen(USER_SOCK_DIR_BASE))) {
+
+ if (snprintf(dir_name, PATH_MAX - 1, "%s/%s", USER_TMP_DIR,
+ dirent->d_name) < 0) {
+ continue;
+ }
+
+ if (ustcomm_get_sock_name(dir_name, pid, sock_name)) {
+ continue;
+ }
+
+ result = ustcomm_connect_path(sock_name, app_fd);
+
+ if (result == 0) {
+ goto close_tmp_dir;
+ }
+ }
+ }
+
+close_tmp_dir:
+ closedir(tmp_dir);
+
+ return result;
+}
+
+int ustcomm_connect_app(pid_t pid, int *app_fd)
+{
+ *app_fd = 0;
+
+ if (geteuid()) {
+ return connect_app_non_root(pid, app_fd);
+ } else {
+ return connect_app_root(pid, app_fd);
+ }
+
+}
+
+int ensure_dir_exists(const char *dir, mode_t mode)
{
struct stat st;
int result;
- if(!strcmp(dir, ""))
+ if (!strcmp(dir, ""))
return -1;
result = stat(dir, &st);
- if(result == -1 && errno != ENOENT) {
+ if (result < 0 && errno != ENOENT) {
return -1;
- }
- else if(result == -1) {
+ } else if (result < 0) {
/* ENOENT */
int result;
- /* mkdir mode to 0777 */
- result = mkdir_p(dir, S_IRWXU | S_IRWXG | S_IRWXO);
+ result = mkdir_p(dir, mode);
if(result != 0) {
ERR("executing in recursive creation of directory %s", dir);
return -1;
}
+ } else {
+ if (st.st_mode != mode) {
+ result = chmod(dir, mode);
+ if (result < 0) {
+ ERR("couldn't set directory mode on %s", dir);
+ return -1;
+ }
+ }
}
return 0;
}
-/* Used by the daemon to initialize its server so applications
- * can connect to it.
- */
+char * ustcomm_print_data(char *data_field, int field_size,
+ int *offset, const char *format, ...)
+{
+ va_list args;
+ int count, limit;
+ char *ptr = USTCOMM_POISON_PTR;
+
+ limit = field_size - *offset;
+ va_start(args, format);
+ count = vsnprintf(&data_field[*offset], limit, format, args);
+ va_end(args);
+
+ if (count < limit && count > -1) {
+ ptr = NULL + *offset;
+ *offset = *offset + count + 1;
+ }
+
+ return ptr;
+}
+
+char * ustcomm_restore_ptr(char *ptr, char *data_field, int data_field_size)
+{
+ if ((unsigned long)ptr > data_field_size ||
+ ptr == USTCOMM_POISON_PTR) {
+ return NULL;
+ }
+ return data_field + (long)ptr;
+}
-static const char *find_tok(const char *str)
+int ustcomm_pack_single_field(struct ustcomm_header *header,
+ struct ustcomm_single_field *single_field,
+ const char *string)
{
- while(*str == ' ') {
- str++;
+ int offset = 0;
+
+ single_field->field = ustcomm_print_data(single_field->data,
+ sizeof(single_field->data),
+ &offset,
+ string);
+
+ if (single_field->field == USTCOMM_POISON_PTR) {
+ return -ENOMEM;
+ }
+
+ header->size = COMPUTE_MSG_SIZE(single_field, offset);
+
+ return 0;
+}
- if(*str == 0)
- return NULL;
+int ustcomm_unpack_single_field(struct ustcomm_single_field *single_field)
+{
+ single_field->field = ustcomm_restore_ptr(single_field->field,
+ single_field->data,
+ sizeof(single_field->data));
+ if (!single_field->field) {
+ return -EINVAL;
}
- return str;
+ return 0;
}
-static const char *find_sep(const char *str)
+int ustcomm_pack_channel_info(struct ustcomm_header *header,
+ struct ustcomm_channel_info *ch_inf,
+ const char *trace,
+ const char *channel)
{
- while(*str != ' ') {
- str++;
+ int offset = 0;
- if(*str == 0)
- break;
+ ch_inf->trace = ustcomm_print_data(ch_inf->data,
+ sizeof(ch_inf->data),
+ &offset,
+ trace);
+
+ if (ch_inf->trace == USTCOMM_POISON_PTR) {
+ return -ENOMEM;
+ }
+
+ ch_inf->channel = ustcomm_print_data(ch_inf->data,
+ sizeof(ch_inf->data),
+ &offset,
+ channel);
+
+ if (ch_inf->channel == USTCOMM_POISON_PTR) {
+ return -ENOMEM;
}
- return str;
+ header->size = COMPUTE_MSG_SIZE(ch_inf, offset);
+
+ return 0;
}
-int nth_token_is(const char *str, const char *token, int tok_no)
+
+int ustcomm_unpack_channel_info(struct ustcomm_channel_info *ch_inf)
{
- int i;
- const char *start;
- const char *end;
+ ch_inf->trace = ustcomm_restore_ptr(ch_inf->trace,
+ ch_inf->data,
+ sizeof(ch_inf->data));
+ if (!ch_inf->trace) {
+ return -EINVAL;
+ }
- for(i=0; i<=tok_no; i++) {
- str = find_tok(str);
- if(str == NULL)
- return -1;
+ ch_inf->channel = ustcomm_restore_ptr(ch_inf->channel,
+ ch_inf->data,
+ sizeof(ch_inf->data));
+ if (!ch_inf->channel) {
+ return -EINVAL;
+ }
+
+ return 0;
+}
- start = str;
+int ustcomm_pack_buffer_info(struct ustcomm_header *header,
+ struct ustcomm_buffer_info *buf_inf,
+ const char *trace,
+ const char *channel,
+ int channel_cpu)
+{
+ int offset = 0;
- str = find_sep(str);
- if(str == NULL)
- return -1;
+ buf_inf->trace = ustcomm_print_data(buf_inf->data,
+ sizeof(buf_inf->data),
+ &offset,
+ trace);
- end = str;
+ if (buf_inf->trace == USTCOMM_POISON_PTR) {
+ return -ENOMEM;
}
- if(end-start != strlen(token))
- return 0;
+ buf_inf->channel = ustcomm_print_data(buf_inf->data,
+ sizeof(buf_inf->data),
+ &offset,
+ channel);
- if(strncmp(start, token, end-start))
- return 0;
+ if (buf_inf->channel == USTCOMM_POISON_PTR) {
+ return -ENOMEM;
+ }
- return 1;
+ buf_inf->ch_cpu = channel_cpu;
+
+ header->size = COMPUTE_MSG_SIZE(buf_inf, offset);
+
+ return 0;
}
-char *nth_token(const char *str, int tok_no)
+
+int ustcomm_unpack_buffer_info(struct ustcomm_buffer_info *buf_inf)
{
- static char *retval = NULL;
- int i;
- const char *start;
- const char *end;
+ buf_inf->trace = ustcomm_restore_ptr(buf_inf->trace,
+ buf_inf->data,
+ sizeof(buf_inf->data));
+ if (!buf_inf->trace) {
+ return -EINVAL;
+ }
- for(i=0; i<=tok_no; i++) {
- str = find_tok(str);
- if(str == NULL)
- return NULL;
+ buf_inf->channel = ustcomm_restore_ptr(buf_inf->channel,
+ buf_inf->data,
+ sizeof(buf_inf->data));
+ if (!buf_inf->channel) {
+ return -EINVAL;
+ }
+
+ return 0;
+}
- start = str;
+int ustcomm_pack_ust_marker_info(struct ustcomm_header *header,
+ struct ustcomm_ust_marker_info *ust_marker_inf,
+ const char *trace,
+ const char *channel,
+ const char *ust_marker)
+{
+ int offset = 0;
- str = find_sep(str);
- if(str == NULL)
- return NULL;
+ ust_marker_inf->trace = ustcomm_print_data(ust_marker_inf->data,
+ sizeof(ust_marker_inf->data),
+ &offset,
+ trace);
- end = str;
+ if (ust_marker_inf->trace == USTCOMM_POISON_PTR) {
+ return -ENOMEM;
}
- if(retval) {
- free(retval);
- retval = NULL;
+
+ ust_marker_inf->channel = ustcomm_print_data(ust_marker_inf->data,
+ sizeof(ust_marker_inf->data),
+ &offset,
+ channel);
+
+ if (ust_marker_inf->channel == USTCOMM_POISON_PTR) {
+ return -ENOMEM;
}
- if (asprintf(&retval, "%.*s", (int)(end-start), start) < 0) {
- ERR("nth_token : asprintf failed (%.*s)",
- (int)(end-start), start);
- return NULL;
+
+ ust_marker_inf->ust_marker = ustcomm_print_data(ust_marker_inf->data,
+ sizeof(ust_marker_inf->data),
+ &offset,
+ ust_marker);
+
+ if (ust_marker_inf->ust_marker == USTCOMM_POISON_PTR) {
+ return -ENOMEM;
}
- return retval;
+ header->size = COMPUTE_MSG_SIZE(ust_marker_inf, offset);
+
+ return 0;
+}
+
+int ustcomm_unpack_ust_marker_info(struct ustcomm_ust_marker_info *ust_marker_inf)
+{
+ ust_marker_inf->trace = ustcomm_restore_ptr(ust_marker_inf->trace,
+ ust_marker_inf->data,
+ sizeof(ust_marker_inf->data));
+ if (!ust_marker_inf->trace) {
+ return -EINVAL;
+ }
+
+ ust_marker_inf->channel = ustcomm_restore_ptr(ust_marker_inf->channel,
+ ust_marker_inf->data,
+ sizeof(ust_marker_inf->data));
+ if (!ust_marker_inf->channel) {
+ return -EINVAL;
+ }
+
+ ust_marker_inf->ust_marker = ustcomm_restore_ptr(ust_marker_inf->ust_marker,
+ ust_marker_inf->data,
+ sizeof(ust_marker_inf->data));
+ if (!ust_marker_inf->ust_marker) {
+ return -EINVAL;
+ }
+
+ return 0;
}
+
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