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qmp.c
682 lines (539 loc) · 18.2 KB
/
qmp.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <poll.h>
#include <stdint.h>
#include "xutil.h"
#include "log.h"
#include "qmp.h"
/*
* read over a non-block fd
*/
static int
qmp_read(int fd, void *buf, size_t *len)
{
struct pollfd pfd;
size_t tread = 0, nread;
int r;
pfd.fd = fd;
pfd.events = POLLIN;
while ((r = poll(&pfd, 1, QMP_POLL_TIMEOUT)) != 0) {
if (r == -1)
return -1;
if (pfd.revents & POLLIN) {
/* read at max 1k at a time */
nread = xread(fd, buf, 1024);
tread += nread;
buf += nread;
}
}
*len = tread;
return 0;
}
int
qmp_establish_conn(struct qmp_conn *qmpc)
{
int s;
struct sockaddr_un saddr;
size_t path_len;
size_t nread;
char buf[QMP_MAX_LENGTH];
if (!(path_len = strlen(qmpc->qmp_sock_path))) {
return -1;
}
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
return -1;
}
memset(&saddr, 0, sizeof(struct sockaddr_un));
saddr.sun_family = AF_UNIX;
strncpy(saddr.sun_path, qmpc->qmp_sock_path, path_len);
saddr.sun_path[path_len] = '\0';
qmpc->fd = s;
/* connect to it */
if (connect(qmpc->fd, (struct sockaddr *) &saddr,
sizeof(struct sockaddr_un)) == -1) {
dprintf("Failed to connect to '%s' ('%s')\n",
qmpc->qmp_sock_path, strerror(errno));
close(qmpc->fd);
return -1;
}
/* set non-block and read seq */
xsetnonblock(qmpc->fd);
/* qmp would send a greeting message when connected */
memset(buf, 0, QMP_MAX_LENGTH);
if (qmp_read(qmpc->fd, buf, &nread) == -1) {
return -1;
}
if (nread == 0 && strncasecmp(buf, QMP_GREETING, 7)) {
dprintf("Failed to get QMP greeting message\n");
return -1;
}
return 0;
}
int
qmp_close_conn(const struct qmp_conn *qmpc)
{
if (close(qmpc->fd) == -1) {
return -1;
}
return 0;
}
int
qmp_negotiate(const struct qmp_conn *qmpc)
{
size_t cmd_len, nwrite, nread;
char buf[QMP_MAX_LENGTH];
cmd_len = strlen(QMP_ENTER_COMMAND_MODE);
nwrite = xwrite(qmpc->fd, QMP_ENTER_COMMAND_MODE, cmd_len);
if (nwrite == 0) {
goto err_exit;
}
memset(buf, 0, QMP_MAX_LENGTH);
if (qmp_read(qmpc->fd, buf, &nread) == -1) {
goto err_exit;
}
if (strncasecmp(buf, QMP_COMMAND_MODE_OK, nread)) {
goto err_exit;
}
return 0;
err_exit:
dprintf("Failed to enter in command mode\n");
return -1;
}
/*
* json looks like
*
* {"return": "RAX=ffffffff8101c9a0 RBX=ffffffff818e2880
* RCX=ffffffff818550e0 RDX=0000000000000000\r\n
*/
static int
qmp_populate_reg(const char *buf, const char *reg_name, uint64_t *reg)
{
char *start;
start = strstr(buf, reg_name);
if (!start) {
return -1;
}
while (start && *start) {
if (*start == '=') {
start++;
break;
}
start++;
}
if (sscanf(start, "%lx", reg) != 1) {
return -1;
}
return 0;
}
static int
__qmp_get_x64_regs(char *buf, struct qregs *regs)
{
if (qmp_populate_reg(buf, "RAX", ®s->rax) == -1) {
dprintf("Failed to get register RAX\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "RBX", ®s->rbx) == -1) {
dprintf("Failed to get register RBX\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "RCX", ®s->rcx) == -1) {
dprintf("Failed to get register RCX\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "RDX", ®s->rdx) == -1) {
dprintf("Failed to get register RDX\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "RSI", ®s->rsi) == -1) {
dprintf("Failed to get register RSI\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "RDI", ®s->rdi) == -1) {
dprintf("Failed to get register RDI\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "RBP", ®s->rbp) == -1) {
dprintf("Failed to get register RBP\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "RSP", ®s->rsp) == -1) {
dprintf("Failed to get register RSP\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "RIP", ®s->rip) == -1) {
dprintf("Failed to get register RIP\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "R8", ®s->r8) == -1) {
dprintf("Failed to get register R8\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "R9", ®s->r9) == -1) {
dprintf("Failed to get register R9\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "R10", ®s->r10) == -1) {
dprintf("Failed to get register R10\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "R11", ®s->r11) == -1) {
dprintf("Failed to get register R11\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "R12", ®s->r12) == -1) {
dprintf("Failed to get register R12\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "R13", ®s->r13) == -1) {
dprintf("Failed to get register R13\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "R14", ®s->r14) == -1) {
dprintf("Failed to get register R14\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "R15", ®s->r15) == -1) {
dprintf("Failed to get register R15\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CR0", ®s->cr0) == -1) {
dprintf("Failed to get register CR0\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CR2", ®s->cr2) == -1) {
dprintf("Failed to get register CR2\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CR3", ®s->cr3) == -1) {
dprintf("Failed to get register CR3\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CR4", ®s->cr4) == -1) {
dprintf("Failed to get register CR4\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "ES", ®s->es) == -1) {
dprintf("Failed to get register ES\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CS", ®s->cs) == -1) {
dprintf("Failed to get register CS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "SS", ®s->ss) == -1) {
dprintf("Failed to get register SS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "SS", ®s->ds) == -1) {
dprintf("Failed to get register DS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "GS", ®s->gs) == -1) {
dprintf("Failed to get register GS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "FS", ®s->fs) == -1) {
dprintf("Failed to get register FS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "RFL", ®s->rflags) == -1) {
dprintf("Failed to get register RFLAGS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "EFER", ®s->efer) == -1) {
dprintf("Failed to get register MSR_EFER\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CPL", ®s->cpl) == -1) {
dprintf("Failed to get register CPL\n");
goto err_exit;
}
return 0;
err_exit:
return -1;
}
static int
__qmp_get_x86_regs(char *buf, struct qregs *regs)
{
if (qmp_populate_reg(buf, "EAX", ®s->rax) == -1) {
dprintf("Failed to get register RAX\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "EBX", ®s->rbx) == -1) {
dprintf("Failed to get register RBX\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "ECX", ®s->rcx) == -1) {
dprintf("Failed to get register RCX\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "EDX", ®s->rdx) == -1) {
dprintf("Failed to get register RDX\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "ESI", ®s->rsi) == -1) {
dprintf("Failed to get register RSI\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "EDI", ®s->rdi) == -1) {
dprintf("Failed to get register RDI\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "EBP", ®s->rbp) == -1) {
dprintf("Failed to get register RBP\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "ESP", ®s->rsp) == -1) {
dprintf("Failed to get register RSP\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "EIP", ®s->rip) == -1) {
dprintf("Failed to get register RIP\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CR0", ®s->cr0) == -1) {
dprintf("Failed to get register CR0\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CR2", ®s->cr2) == -1) {
dprintf("Failed to get register CR2\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CR3", ®s->cr3) == -1) {
dprintf("Failed to get register CR3\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CR4", ®s->cr4) == -1) {
dprintf("Failed to get register CR4\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "ES", ®s->es) == -1) {
dprintf("Failed to get register ES\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CS", ®s->cs) == -1) {
dprintf("Failed to get register CS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "SS", ®s->ss) == -1) {
dprintf("Failed to get register SS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "SS", ®s->ds) == -1) {
dprintf("Failed to get register DS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "GS", ®s->gs) == -1) {
dprintf("Failed to get register GS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "FS", ®s->fs) == -1) {
dprintf("Failed to get register FS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "EFL", ®s->rflags) == -1) {
dprintf("Failed to get register RFLAGS\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "EFER", ®s->efer) == -1) {
dprintf("Failed to get register MSR_EFER\n");
goto err_exit;
}
if (qmp_populate_reg(buf, "CPL", ®s->cpl) == -1) {
dprintf("Failed to get register CPL\n");
goto err_exit;
}
return 0;
err_exit:
return -1;
}
static int
qmp_get_regs(char *buf, struct qregs *regs)
{
if (strstr(buf, "RAX")) {
if (__qmp_get_x64_regs(buf, regs) == -1)
return -1;
regs->mode = X64;
} else {
if (__qmp_get_x86_regs(buf, regs) == -1)
return -1;
regs->mode = X86;
}
return 0;
}
static void
qmp_dump_regs(const struct qregs *regs)
{
if (regs->mode == X64) {
dprintf("RAX=0x%.16lx, RBX=0x%.16lx, RCX=0x%.16lx, RDX=0x%.16lx\n",
regs->rax, regs->rbx, regs->rcx, regs->rdx);
dprintf("RSI=0x%.16lx, RDI=0x%.16lx, RBP=0x%.16lx, RSP=0x%.16lx\n",
regs->rsi, regs->rdi, regs->rbp, regs->rsp);
dprintf("RIP=0%.16lx, CPL=%.1lu\n", regs->rip, regs->cpl);
dprintf("R8=0x%.16lx, R9=0x%.16lx, R10=0x%.16lx, R11=0x%.16lx\n",
regs->r8, regs->r9, regs->r10, regs->r11);
dprintf("R12=0x%.16lx, R13=0x%.16lx, R14=0x%.16lx, R15=0x%.16lx\n",
regs->r12, regs->r13, regs->r14, regs->r15);
dprintf("CR0=0x%.16lx, CR2=0x%.16lx, CR3=0x%.16lx, CR4=0x%.16lx\n",
regs->cr0, regs->cr2, regs->cr3, regs->cr4);
} else {
dprintf("EAX=0x%.8lx, EBX=0x%.8lx, ECX=0x%.8lx, EDX=0x%.8lx\n",
regs->rax, regs->rbx, regs->rcx, regs->rdx);
dprintf("ESI=0x%.8lx, EDI=0x%.8lx, EBP=0x%.8lx, ESP=0x%.8lx\n",
regs->rsi, regs->rdi, regs->rbp, regs->rsp);
dprintf("EIP=0%.8lx, CPL=%.1lu\n", regs->rip, regs->cpl);
dprintf("CR0=0x%.8lx, CR2=0x%.8lx, CR3=0x%.8lx, CR4=0x%.8lx\n",
regs->cr0, regs->cr2, regs->cr3, regs->cr4);
}
}
int
qmp_show_regs(const struct qmp_conn *qmpc)
{
size_t nread, nwrite, cmd_len_regs;
char *buf;
struct qregs regs;
cmd_len_regs = strlen(QMP_COMMAND_INFO_REGS);
nwrite = xwrite(qmpc->fd, QMP_COMMAND_INFO_REGS, cmd_len_regs);
if (nwrite != cmd_len_regs) {
return -1;
}
buf = xmalloc(QMP_BUF_LEN);
memset(buf, 0, QMP_BUF_LEN);
if (qmp_read(qmpc->fd, buf, &nread) == -1 || nread <= 0) {
return -1;
}
memset(®s, 0, sizeof(struct qregs));
if (qmp_get_regs(buf, ®s) == -1) {
return -1;
}
qmp_dump_regs(®s);
xfree(buf);
return 0;
}
static int
qmp_parse_cpu_line(const char *str, struct vcpu *vcpu)
{
uint8_t id;
uint64_t pc;
char *state = NULL;
int r;
/* allocate using glibc %m */
r = sscanf(str, " #%hhu: pc=0x%lx (%m[a-z]*", &id, &pc, &state);
if (r < 2) {
return -1;
}
vcpu->id = id;
vcpu->pc = pc;
if (state) {
if (!strncasecmp(state, "halted", 6)) {
vcpu->state = HALTED;
} else {
/* impropable, might get junk */
vcpu->state = UNDEFINED;
}
} else {
/* if state is not present then the CPU is running...*/
vcpu->state = RUNNING;
}
if (state) {
xfree(state);
}
return 0;
}
/*
* json looks like:
*
* {"return": "* CPU #0: pc=0xffffffff81051c02 (halted) thread_id=5132\r\n
* CPU #1: pc=0xffffffff81051c02 (halted) thread_id=5133\r\n"}
*/
static int
qmp_get_vcpus(char *buf, struct vcpus *vcpus)
{
char *r, *ptr;
if (!(r = strstr(buf, "CPU"))) {
return -1;
}
ptr = strtok(r, "CPU");
while (ptr) {
struct vcpu *vcpu = xmalloc(sizeof(struct vcpu));
if (qmp_parse_cpu_line(ptr, vcpu) == -1) {
xfree(vcpu);
return -1;
}
/* next vcpu */
vcpu->next = vcpus->vcpu;
vcpus->vcpu = vcpu;
vcpus->count++;
ptr = strtok(NULL, "CPU");
}
return 0;
}
static void
qmp_dump_vcpus(const struct vcpus *vcpus)
{
struct vcpu *cpu;
for (cpu = vcpus->vcpu; cpu != NULL; cpu = cpu->next) {
dprintf("CPU#%u, PC=0x%lx, ", cpu->id, cpu->pc);
dprintf("State: ");
switch (cpu->state) {
case RUNNING:
dprintf("Running");
break;
case HALTED:
dprintf("Halted");
break;
case UNDEFINED:
dprintf("Undef");
break;
}
dprintf("\n");
}
}
static void
qmp_clean_vpcus(struct vcpus *vcpus)
{
struct vcpu *v = vcpus->vcpu;
while (v) {
if (v->next == NULL) {
/* free the current */
xfree(v);
break;
} else {
struct vcpu *vn = v->next;
xfree(v);
v = vn;
}
}
}
int
qmp_show_vcpus(const struct qmp_conn *qmpc)
{
size_t nread, nwrite, cmd_len_regs;
char *buf;
struct vcpus vcpus;
cmd_len_regs = strlen(QMP_COMMAND_INFO_CPU);
nwrite = xwrite(qmpc->fd, QMP_COMMAND_INFO_CPU, cmd_len_regs);
if (nwrite != cmd_len_regs) {
return -1;
}
buf = xmalloc(QMP_BUF_LEN);
memset(buf, 0, QMP_BUF_LEN);
if (qmp_read(qmpc->fd, buf, &nread) == -1 || nread <= 0) {
return -1;
}
memset(&vcpus, 0, sizeof(struct vcpus));
if (qmp_get_vcpus(buf, &vcpus) == -1) {
xfree(buf);
return -1;
}
qmp_dump_vcpus(&vcpus);
/* clean-up vcpus, as we used a linked list to store them */
qmp_clean_vpcus(&vcpus);
xfree(buf);
return 0;
}