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#define _GNU_SOURCE
#include "proto.h"
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
#define HDR MSG_HDR
void msg_reader_init(msg_reader_t *r) {
memset(r, 0, sizeof *r);
r->cap = 65536;
r->buf = malloc(r->cap);
}
void msg_reader_free(msg_reader_t *r) {
free(r->buf);
free(r->msg);
memset(r, 0, sizeof *r);
}
void msg_reader_feed(msg_reader_t *r, const uint8_t *data, size_t len) {
if (r->len + len > r->cap) {
while (r->cap < r->len + len) r->cap *= 2;
r->buf = realloc(r->buf, r->cap);
}
memcpy(r->buf + r->len, data, len);
r->len += len;
}
bool msg_reader_next(msg_reader_t *r, msg_t *out) {
if (r->len < HDR) return false;
uint32_t len = (uint32_t)r->buf[1] << 24 | (uint32_t)r->buf[2] << 16 |
(uint32_t)r->buf[3] << 8 | r->buf[4];
if (r->len < HDR + (size_t)len) return false;
/* Lift the payload out before compacting the buffer, so the caller's pointer
* does not alias bytes we are about to move. Valid until the next call. */
if (len + 1 > r->msg_cap) {
r->msg_cap = len + 1;
r->msg = realloc(r->msg, r->msg_cap);
}
if (len) memcpy(r->msg, r->buf + HDR, len);
r->msg[len] = 0; /* JSON payloads want a terminator */
out->type = r->buf[0];
out->len = len;
out->data = r->msg;
size_t total = HDR + (size_t)len;
memmove(r->buf, r->buf + total, r->len - total);
r->len -= total;
return true;
}
int msg_send(int fd, uint8_t type, const void *data, size_t len) {
uint8_t hdr[HDR] = {type, (uint8_t)(len >> 24), (uint8_t)(len >> 16),
(uint8_t)(len >> 8), (uint8_t)len};
struct iovec iov[2] = {{hdr, HDR}, {(void *)data, len}};
size_t total = HDR + len, sent = 0;
while (sent < total) {
struct msghdr mh = {0};
struct iovec cur[2];
size_t n = 0;
size_t off = sent;
for (int i = 0; i < 2; i++) {
size_t l = iov[i].iov_len;
if (off >= l) {
off -= l;
continue;
}
cur[n].iov_base = (char *)iov[i].iov_base + off;
cur[n].iov_len = l - off;
off = 0;
n++;
}
mh.msg_iov = cur;
mh.msg_iovlen = n;
ssize_t w = sendmsg(fd, &mh, MSG_NOSIGNAL);
if (w < 0) {
if (errno == EINTR) continue;
return -1;
}
sent += (size_t)w;
}
return 0;
}
static int session_dir(char *out, size_t cap) {
const char *run = getenv("XDG_RUNTIME_DIR");
if (run && *run)
snprintf(out, cap, "%s/slosh", run);
else
snprintf(out, cap, "/tmp/slosh-%u", (unsigned)getuid());
if (mkdir(out, 0700) != 0 && errno != EEXIST) return -1;
return 0;
}
int session_socket_path(const char *name, char *out, size_t cap) {
char dir[512];
if (session_dir(dir, sizeof dir) != 0) return -1;
snprintf(out, cap, "%s/%s.sock", dir, name);
return 0;
}
int session_log_path(const char *name, char *out, size_t cap) {
char dir[512];
if (session_dir(dir, sizeof dir) != 0) return -1;
snprintf(out, cap, "%s/%s.log", dir, name);
return 0;
}
size_t session_list(char ***out_names) {
char dir[512];
if (session_dir(dir, sizeof dir) != 0) return 0;
DIR *d = opendir(dir);
if (!d) return 0;
char **names = NULL;
size_t n = 0;
struct dirent *e;
while ((e = readdir(d))) {
size_t l = strlen(e->d_name);
if (l < 6 || strcmp(e->d_name + l - 5, ".sock") != 0) continue;
names = realloc(names, (n + 1) * sizeof *names);
names[n] = strndup(e->d_name, l - 5);
n++;
}
closedir(d);
*out_names = names;
return n;
}
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