minadbd/services.c

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#include "sysdeps.h"
#include "fdevent.h"

#define  TRACE_TAG  TRACE_SERVICES
#include "adb.h"

typedef struct stinfo stinfo;

struct stinfo {
    void (*func)(int fd, void *cookie);
    int fd;
    void *cookie;
};


void *service_bootstrap_func(void *x)
{
    stinfo *sti = x;
    sti->func(sti->fd, sti->cookie);
    free(sti);
    return 0;
}

static void sideload_service(int s, void *cookie)
{
    unsigned char buf[4096];
    unsigned count = (unsigned)(uintptr_t)cookie;
    int fd;

    fprintf(stderr, "sideload_service invoked\n");

    fd = adb_creat(ADB_SIDELOAD_FILENAME, 0644);
    if(fd < 0) {
        fprintf(stderr, "failed to create %s\n", ADB_SIDELOAD_FILENAME);
        adb_close(s);
        exit(1);
    }

    while(count > 0) {
        unsigned xfer = (count > 4096) ? 4096 : count;
        if(readx(s, buf, xfer)) break;
        if(writex(fd, buf, xfer)) break;
        count -= xfer;
    }

    if(count == 0) {
        writex(s, "OKAY", 4);
    } else {
        writex(s, "FAIL", 4);
    }
    adb_close(fd);
    adb_close(s);

    if (count == 0) {
        fprintf(stderr, "adbd exiting after successful sideload\n");
        sleep(1);
        exit(0);
    }
}


#if 0
static void echo_service(int fd, void *cookie)
{
    char buf[4096];
    int r;
    char *p;
    int c;

    for(;;) {
        r = read(fd, buf, 4096);
        if(r == 0) goto done;
        if(r < 0) {
            if(errno == EINTR) continue;
            else goto done;
        }

        c = r;
        p = buf;
        while(c > 0) {
            r = write(fd, p, c);
            if(r > 0) {
                c -= r;
                p += r;
                continue;
            }
            if((r < 0) && (errno == EINTR)) continue;
            goto done;
        }
    }
done:
    close(fd);
}
#endif

static int create_service_thread(void (*func)(int, void *), void *cookie)
{
    stinfo *sti;
    adb_thread_t t;
    int s[2];

    if(adb_socketpair(s)) {
        printf("cannot create service socket pair\n");
        return -1;
    }

    sti = malloc(sizeof(stinfo));
    if(sti == 0) fatal("cannot allocate stinfo");
    sti->func = func;
    sti->cookie = cookie;
    sti->fd = s[1];

    if(adb_thread_create( &t, service_bootstrap_func, sti)){
        free(sti);
        adb_close(s[0]);
        adb_close(s[1]);
        printf("cannot create service thread\n");
        return -1;
    }

    D("service thread started, %d:%d\n",s[0], s[1]);
    return s[0];
}

int service_to_fd(const char *name)
{
    int ret = -1;

    if (!strncmp(name, "sideload:", 9)) {
        ret = create_service_thread(sideload_service, (void*)(uintptr_t)atoi(name + 9));
#if 0
    } else if(!strncmp(name, "echo:", 5)){
        ret = create_service_thread(echo_service, 0);
#endif
    }
    if (ret >= 0) {
        close_on_exec(ret);
    }
    return ret;
}